Crucible Patents (Class 373/156)
  • Patent number: 9150426
    Abstract: The product of a molten alkali metal metalate phase separation can be processed into a purified metal from a metal source. Metal sources include native ores, recycled metal, metal alloys, impure metal stock, recycle materials, etc. The method uses a molten alkali metal metalate as a process medium or solvent in purifying or extracting high value metal or metal oxides from metal sources. Vitrification methods using the silicate glass separation phase can be prepared as is or can be prepared with a particulate phase distributed throughout the silica glass phase and encapsulated and fixed within the continuous glass phase. Tungsten metal can be obtained from an alkali metal tungstate. A typically finely divided tungsten metal powder can be obtained from a variety of tungsten sources including recycled tungsten scrap, tungsten carbide scrap, low grade tungsten ore typically comprising tungsten oxide or other form of tungsten in a variety of oxidation states.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: October 6, 2015
    Assignee: TUNDRA COMPOSITES, LLC
    Inventor: Rodney Kieth Williams
  • Patent number: 9001863
    Abstract: A graphite crucible for electromagnetic induction-based silicon melting and an apparatus for silicon melting/refining using the same, which performs a melting operation by a combination of indirect melting and direct melting. The crucible is formed of a graphite material and includes a cylindrical body having an open upper part through which a silicon raw material is charged into the crucible, and an outer wall surround by an induction coil, wherein a plurality of first slits are vertically formed through the outer wall and an inner wall of the crucible, and a plurality of second slits are vertically formed from an edge of the disc-shaped bottom of the crucible toward a center of the bottom.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: April 7, 2015
    Assignee: Korea Institute of Energy Research
    Inventors: Bo Yun Jang, Young Soo Ahn, Joon Soo Kim, Sang Hyun Park, Dong Kook Kim, Gwon Jong Yu
  • Patent number: 8968470
    Abstract: Disclosed herein are a graphite crucible for electromagnetic induction-based silicon melting and an apparatus for silicon melting/refining using the same, which performs a melting operation by a combination of indirect melting and direct melting. The crucible is formed of a graphite material and includes a cylindrical body having an open upper part through which a silicon raw material is charged into the crucible, and an outer wall surrounded by an induction coil, wherein a plurality of slits are vertically formed through the outer wall and an inner wall of the crucible such that an electromagnetic force created by an electric current flowing in the induction coil acts toward an inner center of the crucible to prevent a silicon melt from contacting the inner wall of the crucible.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: March 3, 2015
    Assignee: Korea Institute of Energy Research
    Inventors: Bo Yun Jang, Young Soo Ahn, Joon Soo Kim, Sang Hyun Park, Dong Kook Kim, Gwon Jong Yu
  • Publication number: 20150036713
    Abstract: A combustion tube mounting system releasably mounts a combustion tube to an aperture in the floor of a furnace housing. The combustion tube has a base assembly with a cam and can be manually or automatically unlocked by cam pins in the floor for selectively engaging the cam for lowering the combustion tube from the floor of the furnace. When a new combustion tube is placed on the lower seal assembly and raised, it automatically aligns and engages the upper furnace seal and engages cams on the floor of the furnace housing which lock the combustion tube in place as it is introduced into the furnace.
    Type: Application
    Filed: October 7, 2014
    Publication date: February 5, 2015
    Inventor: Gordon C. Ford
  • Publication number: 20140369375
    Abstract: Disclosed are vessels used for melting material to be injection molded to form a part. One vessel has a body formed from a plurality of elongate segments configured to be electrically isolated from each other and with a melting portion for melting meltable material therein. Material can be provided between adjacent segments. An induction coil can be used to melt the material in the body. Other vessels have a body with an embedded induction coil therein. The embedded coil can be configured to surround the melting portion, or can be positioned below and/or adjacent the melting portion, so that meltable material is melted. The vessels can be used to melt amorphous alloys, for example.
    Type: Application
    Filed: January 23, 2012
    Publication date: December 18, 2014
    Applicant: Apple Inc.
    Inventors: Quoc Tran Pham, Michael Deming, Theodore A. Waniuk, Sean Timothy O'Keeffe, Joseph Stevick
  • Patent number: 8767794
    Abstract: A low temperature melting furnace using an external cooling passage includes a wall including a plurality of metal sectors, each metal sector including a cooling passage formed along a longitudinal direction thereof, and an extension tube provided outwardly from the wall and connected to the cooling passage.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: July 1, 2014
    Assignee: Korea Hydro & Nuclear Power Co., Ltd.
    Inventors: Hyun Je Cho, Deuk Man Kim, Seok Mo Choi, Cheon Woo Kim, Jung Kwon Son, Tae Won Hwang
  • Patent number: 8718114
    Abstract: An induction melting furnace having an asymmetrical sloping bottom. The melting furnace includes: an induction coil member provided on the melting furnace so as to melt waste contained in the furnace by vitrification; a bottom unit provided in a lower part of the melting furnace, the bottom unit asymmetrically sloping downward in a direction toward a glass discharge port that is formed through the bottom unit; and a cooling member integrated with the bottom unit. Due to the asymmetrical sloping bottom of the furnace, waste in the furnace can be completely melted and can be easily discharged to the outside and, accordingly, the time and cost required to treat the waste are reduced and this improves work efficiency when treating the waste. Further, due to the insulation material, the melting furnace can be protected from electric damage that may be caused by electric arc.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: May 6, 2014
    Assignee: Korea Hydro & Nuclear Power Co., Ltd.
    Inventors: Hyun Jun Jo, Deuk Man Kim, Seok Mo Choi, Hyun Je Cho, Seung Chul Park, Cheon Woo Kim, Tae Won Hwang
  • Publication number: 20140029644
    Abstract: Apparatus and method are provided for electric induction heating and melting of a transition material that is non-electrically conductive in the solid state and electrically conductive in the non-solid state in an electric induction heating and melting process wherein solid or semi-solid charge is periodically added to a heel of molten transition material initially placed in a refractory crucible. Induction power is sequentially supplied to a plurality of coils surrounding the exterior height of the crucible at high power level and high frequency with in-phase voltage until a crucible batch of transition material is in the crucible when the induction power is reduced in power level and frequency with voltage phase shifting to the induction coils along the height of the crucible to induce a unidirectional electromagnetic stir of the crucible batch of material.
    Type: Application
    Filed: September 9, 2013
    Publication date: January 30, 2014
    Applicant: Inductotherm Corp.
    Inventor: Oleg S. FISHMAN
  • Publication number: 20140010257
    Abstract: Apparatus and method are provided for electric induction heating and melting of a transition material that is non-electrically conductive in the solid state and electrically conductive in the non-solid state in an electric induction heating and melting process wherein solid or semi-solid charge is periodically added to a heel of molten transition material initially placed in a refractory crucible. Induction power is sequentially supplied to a plurality of coils surrounding the exterior height of the crucible at high power level and high frequency with in-phase voltage until a crucible batch of transition material is in the crucible when the induction power is reduced in power level and frequency with voltage phase shifting to the induction coils along the height of the crucible to induce a unidirectional electromagnetic stir of the crucible batch of material.
    Type: Application
    Filed: September 9, 2013
    Publication date: January 9, 2014
    Applicant: Inductotherm Corp.
    Inventor: Oleg S. FISHMAN
  • Publication number: 20140010256
    Abstract: Apparatus and method are provided for electric induction heating and melting of a transition material that is non-electrically conductive in the solid state and electrically conductive in the non-solid state in an electric induction heating and melting process wherein solid or semi-solid charge is periodically added to a heel of molten transition material initially placed in a refractory crucible. Induction power is sequentially supplied to a plurality of coils surrounding the exterior height of the crucible at high power level and high frequency with in-phase voltage until a crucible batch of transition material is in the crucible when the induction power is reduced in power level and frequency with voltage phase shifting to the induction coils along the height of the crucible to induce a unidirectional electromagnetic stir of the crucible batch of material.
    Type: Application
    Filed: September 9, 2013
    Publication date: January 9, 2014
    Applicant: Inductotherm Corp.
    Inventor: Oleg S. FISHMAN
  • Patent number: 8532158
    Abstract: Apparatus and method are provided for electric induction heating and melting of a transition material that is non-electrically conductive in the solid state and electrically conductive in the non-solid state in an electric induction heating and melting process wherein solid or semi-solid charge is periodically added to a heel of molten transition material initially placed in a refractory crucible. Induction power is sequentially supplied to a plurality of coils surrounding the exterior height of the crucible at high power level and high frequency with in-phase voltage until a crucible batch of transition material is in the crucible when the induction power is reduced in power level and frequency with voltage phase shifting to the induction coils along the height of the crucible to induce a unidirectional electromagnetic stir of the crucible batch of material.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: September 10, 2013
    Assignee: Inductotherm Corp.
    Inventor: Oleg S. Fishman
  • Publication number: 20130223471
    Abstract: The present invention provides a metal sector and a cold crucible induction melter having the same. The cold crucible induction melter includes a wall formed of a plurality of metal sectors insulated by an insulator. Each metal sector includes an inner curved portion which forms an inner surface of the wall and is convex inward relative to the wall, an outer planar portion which forms an outer surface of the wall, and a side planar portion which connects the inner curved portion to the outer planar portion.
    Type: Application
    Filed: September 26, 2011
    Publication date: August 29, 2013
    Applicant: KOREA HYDRO & NUCLEAR POWER CO., LTD.
    Inventors: Cheon Woo Kim, Deuk Man Kim, Seok Mo Choi, Hyun Jun Jo, Hyun Je Cho, Seung Chul Park, Tae Won Hwang
  • Publication number: 20130182740
    Abstract: A cold crucible induction melter includes an induction coil and a melting furnace. The induction coil serves as a water cooled segment to directly transmit an induced current to a molten material in the cold crucible induction melter (CCIM), improving energy efficiency. Simultaneously, the structure of the CCIM is simplified and enables a smooth discharge even when the molten material consists of a ceramic or a metal material with a high melting point. The cold crucible induction melter heats and melts waste using an induced current which is generated in a water cooled segment by a high frequency current that is applied to the induction coil. The water cooled segment and the induction coil are disposed in a vertical direction so that the induced current that is generated by the induction coil is directly transmitted to the molten material.
    Type: Application
    Filed: September 27, 2010
    Publication date: July 18, 2013
    Applicant: Korea Hydro & Nuclear Power Co., Ltd
    Inventors: Cheon-Woo Kim, Seok-Mo Choi, Hyun-Jun Jo, Jong-Kil Park, Young-Bu Choi
  • Patent number: 8323981
    Abstract: An analytical induction furnace and method for combusting conductive sample materials (500) utilizing a crucible for holding a sample within the induction furnace. Less than one gram of accelerator material is then inserted into the crucible with the sample and the induction furnace is activated for a predetermined time period (503) for thoroughly combusting the sample and accelerator. In some instances, no accelerator is required with the sample at frequencies of approximately 4.5 MHz. The invention provides for the induction furnace that is actuated in an RF frequency range between 2-9 MHz with little to no accelerator for thoroughly melting the sample for use in an analytical instrument.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: December 4, 2012
    Assignee: Leco Corporation
    Inventors: Jason Griesbach, Ted Casper
  • Patent number: 8320427
    Abstract: The introduction of spray formed metals into critical applications in the aircraft engine and power generation industries has been hampered by the possibility of erosion of oxide particles from a crucible lining or pouring nozzle in conventional spray forming equipment. These oxide particles may become inclusions that limit low-cycle fatigue life of parts. Use of a cold-walled induction guide (CIG) with an electrical insulation layer between copper CIG elements and the liquid metal offers a means of delivering ceramic-free alloys to a spray system with improved efficiency. CIG design options facilitated by a new oven-brazed fabrication technique resolve induction coil environmental isolation issues, correct thermal strain tolerance problems, facilitate dual frequency induction designs, allow improved electrical coupling efficiency and thermal efficiency, result in improved melt flow initiation, and facilitate disassembly without damage from the solidified melt.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: November 27, 2012
    Assignee: General Electric Company
    Inventors: William T. Carter, Russell S. Miller, Howard R. Hart, Jr.
  • Patent number: 7792178
    Abstract: A continuous- or intermittent-melt induction furnace useful for heating and/or melting semi-conductor or other materials includes an induction coil, a susceptor switchable between open and closed electric circuit modes, and a crucible. The susceptor is inductively or resistively heated in the closed circuit mode and transfers heat to material in the melting cavity to make it susceptible to inductive heating. The susceptor is then switched to the open circuit mode and the susceptible material is directly inductively heated to melt remaining solid material. A cone-shaped flow guide in the melting cavity improves molten material flow to improve the ability to draw small-particle material into the melt and increase crucible life due to improved heat uniformity. A trap passage communicating with the melting cavity and an exit opening in the crucible allows the flow of material through the exit opening to be controlled by pressure differentials on either side of the trap passage.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: September 7, 2010
    Assignee: Ajax Tocco Magnethermic Corporation
    Inventors: Anthony M. Tenzek, David A. Lazor
  • Publication number: 20100163550
    Abstract: Apparatus and method are provided for heating and melting of materials by electric induction heating of susceptor components in a crucible of the furnace. The susceptor components comprise at least an array of susceptor rods arranged around the inner perimeter of the crucible. A susceptor base may also be provided in the crucible with connection to one end of the susceptor rods. One or more susceptor tubes may also be used within the interior volume of the crucible. Alternating current flow through one or more induction coils surrounding the exterior of the crucible generate magnetic flux fields that couple with the susceptor components to inductively heat the susceptor components. Heat from the susceptor components transfers to the material in the crucible to heat and melt the material.
    Type: Application
    Filed: December 26, 2009
    Publication date: July 1, 2010
    Inventors: Joseph T. BELSH, Satyen N. PRABHU, John H. MORTIMER, Vitaly A. PEYSAKHOVICH
  • Patent number: 7730745
    Abstract: Process for combustion and vitrification of waste in which at least one oxygen plasma jet is associated with a continuous melting device by high frequency direct induction. The crucible is composed of a continuous external shell and a sole plate, both cooled by a liquid circulating in internal channels. The inductor is placed below the sole plate. There is a gravity drain valve at the bottom or on the side.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: June 8, 2010
    Assignees: Commissariat a l'Energie Atomique, Compagnie Generale des Matieres Nucleaires
    Inventors: Christophe Girold, Lionel Bruguiere, Roger Boen, Armand Bonnetier, Louis Bojat
  • Publication number: 20090129429
    Abstract: Apparatus and method are provided for electric induction heating and melting of a transition material that is non-electrically conductive in the solid state and electrically conductive in the non-solid state in an electric induction heating and melting process wherein solid or semi-solid charge is periodically added to a heel of molten transition material initially placed in a refractory crucible. Induction power is sequentially supplied to a plurality of coils surrounding the exterior height of the crucible at high power level and high frequency with in-phase voltage until a crucible batch of transition material is in the crucible when the induction power is reduced in power level and frequency with voltage phase shifting to the induction coils along the height of the crucible to induce a unidirectional electromagnetic stir of the crucible batch of material.
    Type: Application
    Filed: November 11, 2008
    Publication date: May 21, 2009
    Inventor: Oleg S. Fishman
  • Patent number: 7503188
    Abstract: Process for combustion and vitrification of waste in which at least one oxygen plasma jet is associated with a continuous melting device by high frequency direct induction. The crucible is composed of a continuous external shell and a sole plate, both cooled by a liquid circulating in internal channels. The inductor is placed below the sole plate. There is a gravity drain valve at the bottom or on the side.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: March 17, 2009
    Assignees: Commissariat A l 'Energie Atomique, Compagnie Generale des Matieres Nucleaires
    Inventors: Christophe Girold, Lionel Bruguiere, Roger Boen, Armand Bonnetier, Louis Bojat
  • Patent number: 7336692
    Abstract: An induction furnace includes an induction coil, an electrically non-conductive crucible having an inner diameter disposed within the induction coil, and an electrically conductive member disposed below the crucible and having an outer diameter which is further from the induction coil than is the inner diameter of the crucible. Due to the non-conductive nature of material disposed within the crucible at lower temperatures, the induction coil initially inductively heats the conductive member, which transfers heat to the material to melt a portion of the material. Once the material is susceptible to inductive heating (usually upon melting) the susceptible material is inductively heated by the induction coil. During the process, inductive heating of the material greatly increases as inductive heating of the conductive member greatly decreases due to low resistivity of the molten material and due to the molten material being closer to the coil than is the conductive member.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: February 26, 2008
    Inventors: David A. Lazor, Daniel J. Pupillo, Jeffrey P. Deeter, Thomas J. Todaro, Anthony M. Tenzek
  • Patent number: 7137277
    Abstract: The invention relates to a method and a device for producing colored glasses. The aim of the invention is to obtain a paricularly intimate mixture and to enable a quick change of the melt at the same time. To this end, the following procedure steps are applied: a melt made of a compound or fragments of glass is produced, the glass melt is further processed in at least one additional vessel, the melt is supplied to a skull device (3) (skull pot or skull channel) during subsequent processing, a dye is supplied (6, 6.1) to the melt after the melt was in the melting station (1) but before the melt enters the skull device (3) or while said melt is in the skull device.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: November 21, 2006
    Assignee: Schott AG
    Inventors: Hildegard Romer, Werner Kiefer, Wolfgang Schmidbauer
  • Patent number: 7113535
    Abstract: A continuous- or intermittent-melt induction furnace useful for heating and/or melting semi-conductor or other materials includes an induction coil, a susceptor switchable between open and closed electric circuit modes, and a crucible. The susceptor is inductively or resistively heated in the closed circuit mode and transfers heat to material in the melting cavity to make it susceptible to inductive heating. The susceptor is then switched to the open circuit mode and the susceptible material is directly inductively heated to melt remaining solid material. A cone-shaped flow guide in the melting cavity improves molten material flow to improve the ability to draw small-particle material into the melt and increase crucible life due to improved heat uniformity. A trap passage communicating with the melting cavity and an exit opening in the crucible allows the flow of material through the exit opening to be controlled by pressure differentials on either side of the trap passage.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: September 26, 2006
    Assignee: AJAX Tocco Magnethermic Corporation
    Inventors: Anthony M. Tenzek, David A. Lazor
  • Patent number: 7010941
    Abstract: A structural component for a device for the treatment of melts, especially of glass melts, having a base body of metal or of a metal alloy and a cooling system in which a cooling medium is led through the structural component for the leading-off of heat. The base body is provided with a coating of a material the decomposition temperature of which lies below the temperature of the melt, and the cooling system is designed and arranged in such manner that the temperature of the boundary layer of the melt that immediately surrounds the structural component lies below the decomposition temperature of the coating material.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: March 14, 2006
    Assignee: Schott AG
    Inventors: Christian Kunert, Uwe Kolberg, Werner Kiefer, Hildegard Römer, Volker Ohmstede
  • Patent number: 6996153
    Abstract: Vertical segments of a side wall of a crucible for an induction furnace are assembled at an adjustable, invariable position by screws screwed into tapped holes of a flange common to all segments. A precise assembly is thus obtained producing no deformation and no internal stresses. The segments are coated with a ceramic coating for their protection and to prevent formation of electric arcs. Junction edges of faces are rounded to achieve the same effect. Water cooling boxes of the lower furnace hearth are similarly constructed. The apparatus can, as an example, be applied to vitrification techniques.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: February 7, 2006
    Assignees: Commissariat a l'Energie Atomique, Compagnie Generale des Matieres Nucleaires
    Inventors: Patrice Brun, Jacques Lacombe, Christian Ladirat, Francis Bousquet
  • Patent number: 6817212
    Abstract: The invention relates to a skull pot for melting or refining glass or glass ceramics, comprising a pot wall (1), a pot base, and an induction coil (3) which surrounds said pot wall and through which high-frequency energy can be coupled into the contents of the pot. The pot wall is made up of a ring of metal pipes (1.1) which can be connected to a cooling medium, slot-type intermediate chambers being provided between adjacent metal pipes. The pot base has a run-off for the melt. The metal pipes (1.1) that form the pot wall (1) arm short-circuited with each other above the base in order to increase the degree of efficiency of the skull pot and especially, in order to even out the temperature profile of the melt throughout the depth of the melt.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: November 16, 2004
    Assignee: Schott GLAS
    Inventors: Hildegard Römer, Uwe Kolberg, Guido Räke, Werner Kiefer, Michael Kohl, Wolfgang Schmidbauer
  • Patent number: 6798821
    Abstract: A method for solidification-controllable induction melting of alloy with cold copper crucible employs the vacuum induction furnace with cold crucible to melt metals, particularly active metals, to obtain alloy ingots having directionally solidified structure at the same time. By using the cold crucible also as a solidification mold in the melting of metal materials, controlling working parameters of the induction furnace, and changing the copper crucible design, it is possible to control the solidified structure of the melted alloy and obtain high quality ingots having impurity-free and directionally arranged or fine-crystalline structure. The problem of low metal melting efficiency in the conventional vacuum induction furnace with cold crucible due to loss of a large amount of heat carried away by cooling water for cooling the crucible can therefore be overcome.
    Type: Grant
    Filed: April 8, 2003
    Date of Patent: September 28, 2004
    Assignee: National Taiwan University
    Inventors: Shuang-Shii Lian, Chu Hsia Ching
  • Patent number: 6793894
    Abstract: This invention is provided for improvement of corrosion-resistant property of a crucible and for promotion of safety in a pyrochemical reprocessing method for the spent nuclear fuel. The spent nuclear fuel is dissolved in a molten salt placed in the crucible. In a pyrochemical reprocessing method, the nuclear fuel is deposited, and the crucible (2) is heated by induction heating. Cooling media (5, 6) are supplied to cool down, and a molten salt layer (7) is maintained by keeping balance between the heating and the cooling, and a solidified salt layer (8) is formed on inner wall surface of the crucible.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: September 21, 2004
    Assignee: Japan Nuclear Cycle Development Institute
    Inventors: Hiroshi Hayashi, Tsutomu Koizumi, Tadahiro Washiya, Kenji Koizumi
  • Patent number: 6768766
    Abstract: An upper ring for an induction furnace. The upper ring is cast as one piece in a holder off of the furnace. The precast upper ring may be used as a replacement for the cast in place upper rings present on previously installed furnaces or may be used in the construction of new furnaces. The electromagnetic induction coil of the furnace may be modified to include cooling turns at its upper end when the holder with the one piece cast upper ring is installed on the furnace.
    Type: Grant
    Filed: January 6, 2003
    Date of Patent: July 27, 2004
    Assignee: ABB Inc.
    Inventor: Daniel K. Green
  • Publication number: 20040131103
    Abstract: An upper ring for an induction furnace. The upper ring is cast as one piece in a holder off of the furnace. The precast upper ring may be used as a replacement for the cast in place upper rings present on previously installed furnaces or may be used in the construction of new furnaces. The electromagnetic induction coil of the furnace may be modified to include cooling turns at its upper end when the holder with the one piece cast upper ring is installed on the furnace.
    Type: Application
    Filed: January 6, 2003
    Publication date: July 8, 2004
    Inventor: Daniel K. Green
  • Patent number: 6757317
    Abstract: A device for the melting or purifying of inorganic substances, in particular of glass, which comprises a number of metal tubes which may be attached to a cooling medium and which are arranged next to each other, in such a way that together they form a container, a high frequency coil for the injection of energy into the container contents and a plastic coating for the metal tubes, the decomposition temperature of which lies below the temperature of the melt. The cooling system is configured and arranged such that the temperature of the boundary layer of the melt, immediately surrounding the component, lies below that of the decomposition temperature of the coating material.
    Type: Grant
    Filed: August 26, 2002
    Date of Patent: June 29, 2004
    Assignee: Schott Glas
    Inventors: Christian Kunert, Uwe Kolberg, Hildegard Römer
  • Publication number: 20040105483
    Abstract: A method for solidification-controllable induction melting of alloy with cold copper crucible employs the vacuum induction furnace with cold crucible to melt metals, particularly active metals, to obtain alloy ingots having directionally solidified structure at the same time. By using the cold crucible also as a solidification mold in the melting of metal materials, controlling working parameters of the induction furnace, and changing the copper crucible design, it is possible to control the solidified structure of the melted alloy and obtain high quality ingots having impurity-free and directionally arranged or fine-crystalline structure. The problem of low metal melting efficiency in the conventional vacuum induction furnace with cold crucible due to loss of a large amount of heat carried away by cooling water for cooling the crucible can therefore be overcome.
    Type: Application
    Filed: April 8, 2003
    Publication date: June 3, 2004
    Inventors: Shuang-Shii Lian, Chu Hsia Ching
  • Patent number: 6577667
    Abstract: According to the invention, the skull pot is provided with the following characteristics: a pot wall (1), a bottom (3) and an induction coil (9) which surrounds the pot wall (1) and by means of which high-frequency energy can be coupled into the contents of the pot. The pot wall (1) is made of a ring of metal pipes (1.1) which can be connected to a cooling medium. Slits are embodied between adjacent metal pipes (1.1). The metal pipes (1.1) are bent at a right angle at the upper ends thereof in such a way that said pipes extend towards the outside, when the pot wall (1) is viewed from above, and form a collar (2). The collar (2) is surrounded by an additional wall (upper wall 4). The upper edge of said wall is situated on a higher level than the collar (2) in such a way that the melt covers the collar (2) during operation.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: June 10, 2003
    Assignee: Schott Glas
    Inventors: Hildegard Römer, Wolfgang Schmidbauer, Werner Kiefer, Guido Räke, Frank-Thomas Lentes
  • Patent number: 6568215
    Abstract: Apparatus suitable for vitrifying nuclear waste comprises a tunable microwave cavity connected by a first wave guide to a source of microwave energy; cooling coils for cooling the exterior of the cavity; a hopper for loading particulate fusible material to the interior of the cavity; within the cavity a crucible made of melted and re-solidified fusible particulate material; an exit-chamber connected by a second waveguide to a second microwave source; and a pipe for supplying argon gas to the exit chamber so that a plasma torch can be generated. The separating of the crucible form the cavity walls by unmelted material gives significant advantages in case of cleaning and reduced energy consumption.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: May 27, 2003
    Assignee: British Nuclear Fuels PLC.
    Inventors: John Anthony Schofield, James Lucas
  • Patent number: 6557620
    Abstract: An attachment apparatus for a heater for attaching the heater, which is configured in an almost circular shape in its side view and cut at a circumferential portion thereof to form opposite circumferential end portions, to an external peripheral portion of a heated member of a cylindrical or column shape, includes a pair of stop metal members fixed near the circumferential end portions of the heater and a spring, both end portions of the spring engaged with the stop metal members in a state being pulled by the stop metal members with a predetermined tension, respectively, the opposite circumferential end portions of the heater are attracted to each other and so the heater is elastically adhered to the external peripheral portion of the heated member.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: May 6, 2003
    Assignee: The Japan Steel Works, Ltd.
    Inventor: Junichi Oshimo
  • Patent number: 6507599
    Abstract: An induction heating furnace includes a furnace body having a side wall extending so obliquely as to increase in radius from the bottom to the top edge portion and formed by a plurality of longitudinally split, conductive segments arrayed circumferentially and insulated from each other, a first induction heating coil arranged at an outer periphery of the side wall for subjecting a to-be-heated material accommodated in the furnace body to induction heating and a melt-use power source for supplying AC power to the first induction heating coil.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: January 14, 2003
    Assignee: Shinko Electric Co., Ltd.
    Inventors: Masanori Tsuda, Atsushi Okuno, Yasuhiro Nakai
  • Patent number: 6507598
    Abstract: An induction heating furnace includes a furnace body having a side wall extending so obliquely as to increase in radius from the bottom to the top edge portion and formed by a plurality of longitudinally split, conductive segments arrayed circumferentially and insulated from each other, a first induction heating coil arranged at an outer periphery of the side wall for subjecting a to-be-heated material accommodated in the furnace body to induction heating and a melt-use power source for supplying AC power to the first induction heating coil.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: January 14, 2003
    Assignee: Shinko Electric Co., Ltd.
    Inventors: Masanori Tsuda, Atsushi Okuno, Yasuhiro Nakai
  • Publication number: 20020159498
    Abstract: An induction heating and melting system uses a crucible formed from a material that has a high electrical resistivity or high magnetic permeability, and one or more inductor coils formed from a wound cable consisting of multiple individually insulated copper conductors to form an induction furnace that, along with its associated power supply, provides a compact design. The system components are air-cooled; no water-cooling is required. The crucible may alternatively be shaped as a tunnel or enclosed furnace.
    Type: Application
    Filed: April 29, 2002
    Publication date: October 31, 2002
    Inventors: Oleg S. Fishman, John H. Mortimer, Joseph T. Belsh, Aurelian Mavrodin, Richard A. Ranlof
  • Publication number: 20020085614
    Abstract: An induction heating furnace includes a furnace body having a side wall extending so obliquely as to increase in radius from the bottom to the top edge portion and formed by a plurality of longitudinally split, conductive segments arrayed circumferentially and insulated from each other, a first induction heating coil arranged at an outer periphery of the side wall for subjecting a to-be-heated material accommodated in the furnace body to induction heating and a melt-use power source for supplying AC power to the first induction heating coil.
    Type: Application
    Filed: February 1, 2002
    Publication date: July 4, 2002
    Applicant: SHINKO ELECTRIC CO., LTD.
    Inventors: Masanori Tsuda, Atsushi Okuno, Yasuhiro Nakai
  • Publication number: 20020085613
    Abstract: An induction heating furnace includes a furnace body having a side wall extending so obliquely as to increase in radius from the bottom to the top edge portion and formed by a plurality of longitudinally split, conductive segments arrayed circumferentially and insulated from each other, a first induction heating coil arranged at an outer periphery of the side wall for subjecting a to-be-heated material accommodated in the furnace body to induction heating and a melt-use power source for supplying AC power to the first induction heating coil.
    Type: Application
    Filed: February 1, 2002
    Publication date: July 4, 2002
    Applicant: SHINKO ELECTRIC CO., LTD.
    Inventors: Masanori Tsuda, Atsushi Okuno, Yasuhiro Nakai
  • Publication number: 20020080847
    Abstract: An induction heating furnace includes a furnace body having a side wall extending so obliquely as to increase in radius from the bottom to the top edge portion and formed by a plurality of longitudinally split, conductive segments arrayed circumferentially and insulated from each other, a first induction heating coil arranged at an outer periphery of the side wall for subjecting a to-be-heated material accommodated in the furnace body to induction heating and a melt-use power source for supplying AC power to the first induction heating coil.
    Type: Application
    Filed: February 1, 2002
    Publication date: June 27, 2002
    Applicant: SHINKO ELECTRIC CO., LTD.
    Inventors: Masanori Tsuda, Atsushi Okuno, Yasuhiro Nakai
  • Patent number: 6400749
    Abstract: An induction furnace includes material between the crucible and the coil to enable easy removal when the crucible needs to be replaced. The material is made up of a slip plane material and reinforcement, and preferably comprises a laminate of flexible mica paper and glass fabric.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: June 4, 2002
    Assignee: Elmelin PLC
    Inventor: Stephen Stewart Weiss
  • Patent number: 6393044
    Abstract: An induction melting system uses a crucible formed from a material that has a high electrical resistivity or high magnetic permeability and one or more inductor coils formed from a wound cable consisting of multiple individually insulated copper conductors to form an induction furnace that, along with its associated power supply, provides a compact design. The system components are air-cooled; no water-cooling is required. The induction melting system is particularly useful for separating metal from scrap, casting molds directly from the induction furnace, and providing a continuous supply of molten metal.
    Type: Grant
    Filed: April 14, 2000
    Date of Patent: May 21, 2002
    Assignee: Inductotherm Corp.
    Inventors: Oleg S. Fishman, John H. Mortimer, Joseph T. Belsh, Richard A. Ranlof, Aurelian Mavrodin
  • Patent number: 6307875
    Abstract: An induction heating furnace includes a furnace body having a side wall extending so obliquely as to increase in radius from the bottom to the top edge portion and formed by a plurality of longitudinally split, conductive segments arrayed circumferentially and insulated from each other, a first induction heating coil arranged at an outer periphery of the side wall for subjecting a to-be-heated material accommodated in the furnace body to induction heating and a melt-use power source for supplying AC power to the first induction heating coil.
    Type: Grant
    Filed: April 23, 1998
    Date of Patent: October 23, 2001
    Assignee: Shinko Electric Co., Ltd.
    Inventors: Masanori Tsuda, Atsushi Okuno, Yasuhiro Nakai
  • Patent number: 6304590
    Abstract: An increased diameter wire is formed by drawing a feed wire through a cooled nozzle located in a cooled crucible, and through a liquid metal bath contained within the crucible. Liquid metal freezes onto the feed wire as it passes through the bath, thereby increasing the diameter of the feed wire to form an increased diameter wire product. The invention is particularly suited to forming a wire from a metal composition that would undesirably react with refractory apparatus.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: October 16, 2001
    Assignee: Consarc Corporation
    Inventor: Raymond J. Roberts
  • Patent number: 6226314
    Abstract: An assembly includes a tapping device for flow therethrough of molten material and a cooled inductor to be connected to an electrical source and mounted with respect to the tapping device to be inductively coupled to one of the tapping device and the molten material flowing therethrough. The inductor includes an electrically conductive induction coil having therethrough at least one cooling passage. Each cooling passage has connected thereto at least one supply line for supply thereto of cooling fluid and at least one discharge line for discharge therefrom of the cooling fluids.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: May 1, 2001
    Assignee: Didier-Werke AG
    Inventors: Raimund Brückner, Daniel Grimm, Steve Lee
  • Patent number: 6219372
    Abstract: A guide tube structure for flux concentration is provided. The discharge guide tube comprises a central orifice that extends from a source of metal to an outlet in the discharge guide tube for directing a stream of melt therethrough; a structure that generates an electromagnetic field in the discharge guide tube; and an interior discharge guide tube flux concentration configuration that is capable of concentrating at least one of heat, electromagnetic field, and electromagnetic flux onto the stream of melt that flows through the central orifice. The electromagnetic field is applied at a substantially constant level.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: April 17, 2001
    Assignee: General Electric Company
    Inventors: Robert John Zabala, Howard Roscoe Hart, Jr., Mark Gilbert Benz, Bruce Alan Knudsen, William Thomas Carter, Jr., Russell Scott Miller
  • Patent number: 6214286
    Abstract: A solid charge of metal or alloy is placing in a crucible melting chamber defined by a monolithic refractory tubular sleeve disposed on a water cooled metallic base, an energizing induction coil disposed about the sleeve to inductively heat the solid charge to a molten state in the melting chamber including forming a skull of solidified metal or alloy on inner surfaces of the sleeve and base to confine the molten charge, and removing the molten charge from the melting chamber, leaving the skull in place on the inner surfaces of the sleeve and base. The crucible can be reused in melting another solid charge of metal or alloy after the molten charge is removed.
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: April 10, 2001
    Assignee: Howmet Research Corporation
    Inventors: Donald E. Larsen, Jr., Christine M. Stabile, Richard A. Biondi, Donald L. Bierstine, Robert L. Larsen
  • Patent number: 6185243
    Abstract: A melting furnace for insulating materials is provided with a cooled crucible (10) having continuous metal side malls, a partitioned and cooled bottom (12) and at least one induction coil (28) placed under the bottom which serves as the sole heating means. The depth of the melting bath contained in the crucible and the excitation frequency of the induction coil are selected so that the depth and half of the inside radius of the crucible are less than the skin thickness of the bath.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: February 6, 2001
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Roger Boen, Armand Bonnetier, Christian Ladirat
  • Patent number: 6163562
    Abstract: An induction heating device which raises the temperature of a metal to be heated for one of melting or hot machining while providing considerably energy saving, increasing yield and observing current safety standards. The device (10) uses a cavity (11) to receive the metal to be heated and at least two magnetic yokes (13) arranged around a periphery of cavity (11), each yoke supporting an independent induction coil (14). The induction coils are mounted and wound in the same direction such that a north pole, of each coil, is located on one side of the cavity and a south pole is located on an opposite side of the cavity. The inductive coils are arranged so as to generate active non null magnetic field zones and inactive zones of null magnetic fields distributed about the periphery of the cavity. An inactive zone of null magnetic fields is located between each adjacent active non null magnetic field zone.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: December 19, 2000
    Assignee: Internova International Innovation Company B.V.
    Inventor: Fran.cedilla.ois-Marie Franci