Including Vitrifying Or Sintering (e.g., Fusing, Firing, Burning, Etc.) Patents (Class 264/434)
  • Publication number: 20120093674
    Abstract: There is provided a method for manufacturing a three-dimensional shaped object. The method of the present invention comprises the repeated steps of: (i) forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby allowing a sintering of the powder in the predetermined portion or a melting and subsequent solidification thereof; and (ii) forming another solidified layer by newly forming a powder layer on the resulting solidified layer, followed by the irradiation of a predetermined portion of the powder layer with the light beam; wherein only the surface portion of the solidified layer, to which a force is applied when the three-dimensional shaped object is used, is subjected to a machining process.
    Type: Application
    Filed: June 23, 2010
    Publication date: April 19, 2012
    Applicant: PANASONIC ELECTRIC WORKS CO., LTD.
    Inventors: Satoshi Abe, Yoshikazu Higashi, Isao Fuwa, Masataka Takenami
  • Publication number: 20120077032
    Abstract: A method for producing one or more nanofibers includes providing (a) a solution comprising a polymer and a solvent, (b) a nozzle for ejecting the solution, and (c) a stationary collector disposed a distance d apart from the nozzle. A voltage is applied between the nozzle and the stationary collector, and a jet of the solution is ejected from the nozzle toward the stationary collector. An electric field intensity of between about 0.5 and about 2.0 kV/cm is maintained, where the electric field intensity is defined as a ratio of the voltage to the distance d. At least a portion of the solvent from the stream is evaporated, and one or more polymer nanofibers are deposited on the stationary collector as the stream impinges thereupon. Each polymer nanofiber has an average diameter of about 500 nm or less and may serve as a precursor for carbon fiber production.
    Type: Application
    Filed: September 23, 2011
    Publication date: March 29, 2012
    Inventors: Ioannis Chasiotis, Mohammad Naraghi, Salman N. Arshad
  • Publication number: 20120049132
    Abstract: A molten cermet material including a molten cermet of cerium oxide CeO2, optionally doped, and nickel Ni and/or cobalt Co, the cermet having a eutectic structure, the cerium oxide, nickel, and cobalt contents being in mol %: 0.351 Ni+0.136 Co?(CeO2+dopant)?0.538 Ni+0.282 Co.
    Type: Application
    Filed: March 12, 2010
    Publication date: March 1, 2012
    Applicant: CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS
    Inventors: Samuel Marlin, Victor Manuel Orera Clemente, Jose Ignacio Pena Torre, Luis Ortega San Martin
  • Publication number: 20110297870
    Abstract: Provided is an oriented piezoelectric material with satisfactory sintering property free of Pb that is a hazardous substance, and a water-soluble alkaline ion, and a production method therefor. To this end, provided is a compound, including a tungsten bronze structure metal oxide, in which: the tungsten bronze structure metal oxide contains at least metal elements of Ba, Bi, Ca, and Nb, the metal elements satisfying the following conditions in terms of molar ratio; and has a C-axis orientation. The compound shows Ba/Nb=a: 0.363<a<0.399, Bi/Nb=b: 0.0110<b<0.0650, and Ca/Nb=c: 0.005<c<0.105. The tungsten bronze structure metal oxide preferably includes (1?x)·Ca1.4Ba3.6Nb10O30?x·Ba4Bi0.67Nb10O30 (0.30?x?0.95).
    Type: Application
    Filed: April 20, 2010
    Publication date: December 8, 2011
    Applicants: University of Yamanashi, Canon Kabushiki Kaisha
    Inventors: Takanori Matsuda, Takayuki Watanabe, Hiroshi Saito, Nobuhiro Kumada
  • Publication number: 20110298336
    Abstract: To provide a piezoelectric ceramic containing BiFeO3 having a {110} plane orientation in a pseudo-cubic form, which is suited for the domain engineering, the piezoelectric ceramic includes a perovskite-type metal oxide represented by the following general formula (1), and has a {110} plane orientation in a pseudo-cubic form: xBiFeO3-(1-x)ABO3??General Formula (1) where A and B each represent one kind or more of metal ions; A represents a metal ion having a valence of 1, 2 or 3; and B represents a metal ion having a valence of 3, 4, or 5, provided that x is within a range of 0.3?x?1.
    Type: Application
    Filed: March 30, 2010
    Publication date: December 8, 2011
    Applicants: UNIVERSITY OF YAMANASHI, CANON KABUSHIKI KAISHA
    Inventors: Hiroshi Saito, Takanori Matsuda, Kenji Takashima, Nobuhiro Kumada
  • Publication number: 20110260368
    Abstract: The invention concerns a method for manufacturing a ceramic material with pseudo-isotropic microstructure. The method for tailoring the microstructure for manufacturing of sintered ceramic components involves a spark plasma sintering (SPS) process. By performing the SPS process in at least two steps it is possible to separate densification from grain growth. An initial sintering step at a first temperature and a first pressure, followed by a controlled grain growth step at a higher temperature and lower pressure makes it possible to manufacture ceramic components with controlled microstructure and improved mechanical properties.
    Type: Application
    Filed: August 29, 2008
    Publication date: October 27, 2011
    Applicant: AB SKF
    Inventors: Zhijian Shen, Saeid Esmaeilzadeh, Katarina Flodstrom, Charlotte Vieillard
  • Patent number: 8020266
    Abstract: Methods of making an energy harvesting device are described. A case and integrated piezoelectric cantilever to harvest vibration energy from an environment being sensed is produced via a print forming method injection molding method. The cantilever device consists of a piezoelectric material member, and a proof mass of high density material coupled to the piezoelectric member. The print forming method is used to build up the base and walls of the device as well as the neutral layers of the piezoelectric member. Metal layers are printed to form the electrode layers of the piezoelectric member and the electrical contact portions of the device. Passive components can also be formed as part of the layers of the device. The entire assembly can be encapsulated in plastic.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: September 20, 2011
    Assignee: Robert Bosch Gmbh
    Inventors: Markus Ulm, Brian Stark, Matthias Metz
  • Publication number: 20110121493
    Abstract: A method for manufacturing a ceramic fired body includes molding and degreasing a ceramic raw material to manufacture a ceramic degreased body. The ceramic degreased body is fired in a continuous firing furnace. The firing step includes preheating the ceramic degreased body up to a preheating temperature of at least about 1500° C. and at most about 2000° C. by resistance heating with a resistance heating mechanism. High-temperature firing includes heating the ceramic degreased body from the preheating temperature to a firing temperature of at least about 2000° C. and at most about 2300° C. by both the resistance heating with the resistance heating mechanism and direct energizing heating in which the ceramic degreased body is energized and heated. The temperature of the ceramic degreased body is held at the firing temperature.
    Type: Application
    Filed: November 9, 2010
    Publication date: May 26, 2011
    Applicant: IBIDEN CO., LTD.
    Inventors: Takamitsu SAIJO, Yoshinori Hashimoto
  • Publication number: 20110111945
    Abstract: A tungsten carbide material for use in precision glass molding applications having 6.06-6.13 wt. % carbon, 0.20-0.55 wt. % grain growth inhibitor, less than 0.25 wt. % binder, less than 0.6% wt. % impurities, and balance being tungsten. The tungsten carbide material has a nominal grain size of less than 0.5 microns.
    Type: Application
    Filed: November 10, 2009
    Publication date: May 12, 2011
    Applicant: Kennametal Inc.
    Inventors: Elizabeth Ann Binky Peterson, William Roy Huston, Irene Spitsberg, Michael James Verti, Sudhir Brahmandam
  • Patent number: 7939007
    Abstract: The present invention relates to a method of preparing ceramics based on lanthanum-doped barium titanate, which comprises the following steps: (a) flash sintering of lanthanum-doped barium titanate powders; and (b) heat treatment of the material thus obtained, in an air atmosphere or in an oxidising atmosphere. The invention also relates to ceramics based on lanthanum-doped barium titanate, possessing a very high real part of the relative dielectric permittivity, and to their use for obtaining capacitors of high capacitance and high capacitance per unit volume for high-voltage withstand capability.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: May 10, 2011
    Assignees: Centre National de la Recherche Scientifique (CNRS), Universite Paul Sabatier Toulouse III
    Inventors: Sophie Guillemet, Madona Boulos, Bernard Durand, Thierry Lebey, Quang Nguyen
  • Patent number: 7938997
    Abstract: Bulk, superhard, B—C—N nanocomposite compacts were prepared by ball milling a mixture of graphite and hexagonal boron nitride, encapsulating the ball-milled mixture at a pressure in a range of from about 15 GPa to about 25 GPa, and sintering the pressurized encapsulated ball-milled mixture at a temperature in a range of from about 1800-2500 K. The product bulk, superhard, nanocomposite compacts were well sintered compacts with nanocrystalline grains of at least one high-pressure phase of B—C—N surrounded by amorphous diamond-like carbon grain boundaries. The bulk compacts had a measured Vicker's hardness in a range of from about 41 GPa to about 68 GPa.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: May 10, 2011
    Assignee: Los Alamos National Security, LLC
    Inventors: Yusheng Zhao, Duanwei He
  • Patent number: 7893000
    Abstract: Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: February 22, 2011
    Assignee: The Doshisha
    Inventors: Ken Hirota, Yoshihiro Nakayama, Shingo Nakane
  • Publication number: 20110039685
    Abstract: A kind of transparent alumina ceramics is disclosed herein, the optical axes of all or part of the crystal grains of the transparent alumina ceramics are arranged in a direction, which makes the transparent alumina ceramics have orientation.
    Type: Application
    Filed: June 28, 2010
    Publication date: February 17, 2011
    Applicant: Shanghai Institute of Ceramics, Chinese Academy of Sciences
    Inventors: Xiaojian MAO, Shiwei WANG, Shunzo SHIMAI
  • Patent number: 7811666
    Abstract: A system for self-repairing matrices such as concrete or cementitous matrices, polymeric matrices, and/or fibrous matrices, including laminates thereof. The system includes repair agents retained in and/or on vessels, such as hollow fibers, within the matrix. Upon impact, the vessel rupture, releasing the chemicals. For multi-layer laminates, the systems provides a total dynamic energetic circulation system that functions as an in situ fluidic system in at least one layer or area. The energy from the impact ruptures the vessels to release the chemical(s), and mixes the chemical(s) and pushes the chemical(s) and/or resulting compound through the matrix. The repair agents can withstand high temperatures, such as the heat of processing of many laminates, e.g., 250-350° F.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: October 12, 2010
    Inventor: Carolyn Dry
  • Patent number: 7799715
    Abstract: Boron carbide ceramics produced by spark sintering methods have more desirable mechanical properties than conventionally produced carbides. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The boron carbides may also contain a carbon nano fiber in a nearly homogeneously dispersed state. The sintered compact has a relative density of a boron carbide ceramic of approximately not less than 99%. The boron carbide ceramics are prepared preferably by subjecting a mixed powder of the starting raw materials and the carbon nano fiber to simultaneous synthesis and sintering using the spark plasma sintering method.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: September 21, 2010
    Assignee: The Doshisha
    Inventors: Ken Hirota, Yoshihiro Nakayama, Shingo Nakane
  • Patent number: 7781028
    Abstract: Amorphous metal oxide thin film is produced by removing through oxygen plasma treatment the organic component from an organics/metal oxide composite thin film having thoroughly dispersed therein such organic component at molecular scale. This ensures production of amorphous metal oxide thin film with low density and excellent thickness precision.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: August 24, 2010
    Assignee: Riken
    Inventors: Toyoki Kunitake, Izumi Ichinose, Shigenori Fujikawa, Jianguo Huang
  • Patent number: 7758776
    Abstract: A system for fabricating a free form structure of a composite material including carbon nanotubes. The system includes a discharge assembly and a composite formation device operatively linked with the discharge assembly. The discharge assembly dispenses a fusing agent such as for example a high energy density emission, a laser emission or a particle beam emission. The composite formation device includes a composite generator and an arranger in operative engagement with a composite generator. The composite generator engages with the fusing agent so as to create a composite nodal element. The composite nodal element includes a matrix and a multiplicity of fibers formed of carbon nanotubes dispersed throughout the matrix. The arranger positions one node relative to another to define the free form structure.
    Type: Grant
    Filed: August 18, 2005
    Date of Patent: July 20, 2010
    Assignee: Lockheed Martin Corporation
    Inventors: Craig A. Brice, Frederick J. Herman
  • Patent number: 7691765
    Abstract: After synthesizing particles by liquid phase synthesis, the solution is substituted without drying these particles, and here, a solution comprising a grain boundary phase composition consisting of at least one or more types selected from a group consisting of Al2O3, yttrium oxide, silicon oxide, yttrium-silicon complex oxide, aluminum-silicon complex oxide, and a compound having a garnet structure with a lower melting point than the aforementioned particles, or a solution comprising a precipitate is introduced. Microparticles are adjusted by allowing adhesion and growth of the solution comprising a composition of grain boundary phase or the solution comprising a precipitate on the surface of the particles; these microparticles are allowed to align in 3-dimensions in solution and are formed into a molded body, and this molded body is sintered.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: April 6, 2010
    Assignee: FUJIFILM Corporation
    Inventors: Masayuki Suzuki, Tomotake Ikada
  • Publication number: 20090301769
    Abstract: The invention relates to a sintering method for manufacturing structures by sintering. In addition, the invention relates to a sintered product, an electronic module, and new uses. In the method, a particle material containing conductive or semiconductive encapsulated nanoparticles is sintered, in order to increase its electrical conductivity, by applying a voltage over the particle material. In the method, a substrate is typically used, one surface of which is at least partly equipped with a layer containing nanoparticles. The method is based on thermal feedback between the voltage feed and the nanoparticles. The invention permits the manufacture of conductive and semiconductive structures and pieces by sintering at room temperature and at normal pressure.
    Type: Application
    Filed: July 5, 2007
    Publication date: December 10, 2009
    Applicant: Valtion teknillinen Tutkimuskeskus
    Inventors: Heikki Seppä, Mark Allen
  • Publication number: 20090209405
    Abstract: A method and product made by using a polymeric ceramic precursor to synthesize dense, crack-free bulk ceramics in a technique using a sacrificial mold provides a ceramic structure for many technical, medical and industrial applications. The novel process uses an open cell material as a sacrificial mold to shape a ceramic precursor during curing. The cured ceramic green body can be machined and shaped to form the desired ceramic structure prior to final pyrolysis. The open cell material forms gas release paths to release large amount of gases generated during the pyrolysis of the cured ceramic precursor. After pyrolysis, an intact, dense, crack-free ceramic structure with high purity, strength and durability is obtained. Uses of the present invention include, but are not limited to, bulk ceramic parts, ceramic crucibles, a replacement material in some applications involving glass, silicon carbides, silicon nitrides, hafnium carbide and the like.
    Type: Application
    Filed: February 17, 2009
    Publication date: August 20, 2009
    Applicant: University of Central Florida Research Foundation, Inc.
    Inventors: Weifeng Fei, Arnold Hill, Linan An
  • Publication number: 20090191112
    Abstract: Disclosed are a method and an apparatus for fabricating solar-grade high purity polycrystalline silicon compacts. Silicon compacts are fabricating by loading polycrystalline silicon powders into a mold without addition of binders in a vacuum atmosphere, and pressurizing and heating the polycrystalline silicon powders. Heating method includes a high-frequency induction heating type, an Ohmic heating type, and a high current supply type.
    Type: Application
    Filed: January 23, 2009
    Publication date: July 30, 2009
    Applicants: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY, ARCHESOLAR CO., LTD.
    Inventors: Byoung Moon MOON, Je Sik Shin, Kyu Suk Choi
  • Publication number: 20090121197
    Abstract: The invention relates to a sintered material which is based on transition metal diborides and comprises a) as main phase, 90-99% by weight of a fine-grained transition metal diboride or transition metal diboride mixed crystal comprising at least two transition metal diborides or mixtures of such diboride mixed crystals or mixtures of such diboride mixed crystals with one or more transition metal diborides, where the transition metals are selected from sub-groups IV to VI of the Periodic Table, b) as second phase, 1-5% by weight of particulate boron carbide and/or silicon carbide and c) optionally as third phase, up to 5% by weight of a non-continuous, oxygen-containing grain boundary phase.
    Type: Application
    Filed: March 12, 2007
    Publication date: May 14, 2009
    Applicant: ESK ERAMICS GmbH & KG
    Inventors: Hubert Thaler, Clemens Schmalzried, Frank Wallmeier, Georg Victor
  • Publication number: 20090098365
    Abstract: Nanocrystalline sintered bodies, and a method of making same, said sintered bodies based on a 95 to 100% content of alpha-aluminum oxide by weight, a Vickers hardness greater than or equal to 17.5 GPa, and a crystal structure where the average primary crystal size of the alpha-aluminum oxide is less than or equal to 100 nanometers.
    Type: Application
    Filed: July 12, 2006
    Publication date: April 16, 2009
    Applicant: Center for Abrasives and Refractories Research & Developement C.A.R.R.D. GmbH
    Inventor: Paul Moeltgen
  • Publication number: 20090090000
    Abstract: An in-mould molding touch module includes a transparent conducting substrate and a molding rind. The transparent conducting substrate has an inner surface and an outer surface. The inner surface has a capacitive electrode layer formed thereon. The capacitive electrode layer is a touch sense circuit made of ITO, and the outer surface is configured for touching the touch sense circuit. The molding rind is integrated to contain a periphery of the transparent conducting substrate by an in-mould injecting mode.
    Type: Application
    Filed: December 22, 2007
    Publication date: April 9, 2009
    Inventors: Sheng-Pin SU, Min-Yi Lee
  • Publication number: 20090079101
    Abstract: The present invention relates to an arrangement for sintering a ceramic body, the arrangement including: an applicator defining a monomode microwave heating chamber; a thermal insulation structure disposed within the chamber; a susceptor disposed within the thermal insulation structure having a lower microwave coupling temperature than the ceramic body; the ceramic body arranged adjacent to the susceptor; a magnetron; and a temperature measurement device. Related methods are also described.
    Type: Application
    Filed: April 28, 2008
    Publication date: March 26, 2009
    Inventors: Jurgen Laubersheimer, Pieter Luypaert, Christian Ritzberger, Jozef Vleugels, Wolfram Holand, Carlo Groffils, Volker Rheinberger
  • Publication number: 20090039562
    Abstract: A method is proposed for producing an anti-scatter grid or collimator for a radiation type, which is formed from at least one base body of prescribable geometry having transmission channels or slits for primary radiation of the radiation type which extend between two opposite surfaces of the base body. The base body is formed from a structural material that strongly absorbs the radiation type, either using the injection molding technique or by way of the technique of stereolithography. The method can be used to produce an anti-scatter grid or collimator with high accuracy and with the aid of only a few steps.
    Type: Application
    Filed: September 29, 2008
    Publication date: February 12, 2009
    Inventors: Andreas Freund, Bjoern Heismann, Harald Maerkl, Martin Schaefer, Thomas Von Der Haar
  • Publication number: 20080223504
    Abstract: A method of manufacturing a thermoelectric converter including supplying raw materials by mutually supplying a p-type semiconductor raw material and an n-type semiconductor raw material into a piercing hole of a honeycomb made of a non-metal inorganic material. The method also includes sintering the p-type semiconductor raw material and the n-type semiconductor raw material supplied in the honeycomb to form a p-type semiconductor and an n-type semiconductor in the piercing hole of the honeycomb, and connecting the p-type semiconductor and an n-type semiconductor formed in the piercing hole of the honeycomb to each other by an electrode.
    Type: Application
    Filed: November 20, 2007
    Publication date: September 18, 2008
    Applicant: IBIDEN CO., LTD.
    Inventor: Kazushige OHNO
  • Patent number: 7392581
    Abstract: A plate member includes a frame portion (51) provided in a state of coupling both one end portion and other end portion and mounting terminal portions (44) protruding from the one end portion and the other end portion of said frame portion (51) to approach each other, from which a PCB joint portions (46) to be a mounting portion to a PCB are formed by cutting and bending when manufacturing a magnetic element. Further, a winding number adjustment means (41), which is capable of selecting joint portions with ends of a coil and adjusting the winding number of the coil in accordance with the selection, protrudes from the one end portion and the other end portion to approach each other farther as compared to the mounting terminal portions (44).
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: July 1, 2008
    Assignee: Sumida Corporation
    Inventors: Kan Sano, Satoru Yamada
  • Publication number: 20080125305
    Abstract: Aluminum titanate precursor batch compositions comprising a recycled aluminum titanate component, at least a portion of the recycled aluminum titanate component being comprised of a recycled pre-reacted aluminum titanate composition or alternatively of an un-reacted green aluminum titanate precursor composition, and methods for producing aluminum titanate ceramic articles utilizing the inventive batch compositions.
    Type: Application
    Filed: November 29, 2006
    Publication date: May 29, 2008
    Inventors: John Paul Day, Robert John Locker, David Lambie Tennent, Christopher John Warren
  • Publication number: 20080114468
    Abstract: A process for making a sintered ceramic medical device, comprising providing an unsintered ceramic composition, forming the unsintered ceramic composition into a green body that comprises unsintered ceramic, irradiating the green body with microwave radiation, and cooling the sintered body. The microwave radiation has a frequency capable of heating the unsintered ceramic to a temperature sufficient to sinter the green body, thereby preparing a sintered ceramic medical device. A medical device comprising volumetrically sintered ceramic, and a volumetrically sintered ceramic are also disclosed.
    Type: Application
    Filed: November 10, 2006
    Publication date: May 15, 2008
    Applicant: Biomet Manufacturing Corp.
    Inventor: Mukesh Kumar
  • Patent number: 7340823
    Abstract: Embodiments include a method for forming a head suspension assembly. A spacer layer is formed in or on a silicon wafer. A transfer film including an opening defining the shape of a slider support membrane is provided, and the opening is filled with a resin material. The transfer film with the resin material therein is positioned over the silicon wafer so that at least a portion of the resin material is positioned adjacent to the spacer layer. The resin material is baked to form a glassy carbon material. The spacer layer is etched to form a trench in the silicon wafer adjacent to the glassy carbon material, and a slider is positioned on the glassy carbon material over the trench.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: March 11, 2008
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventor: Jeffrey S. Lille
  • Patent number: 7326381
    Abstract: A process for fabricating ceramic composites employs a thermoplastic photo-curable pre-ceramic polymer in which the component is shape by a variety of standard composite fabrication techniques, such as filament winding, tape winding, and woven cloth winding. The process includes steps of passing ceramic fiber monofilament, tow, mat, or woven cloth through a solution of said thermoplastic photo-curable pre-ceramic polymer, applying ceramic fiber monofilament, tow, mat, or woven cloth to a moving flat substrate, using a compaction roller to press the thermoplastic pre-ceramic polymer coated ceramic fiber onto flat substrate using photo-light of the ultraviolet, visible, or infrared light spectrum to induce cross-linking (curing) of the photo-curable pre-ceramic polymer thereby rendering a thermoset polymer and either partially or completely pyrolyzing the now cured pre-ceramic polymer matrix coated ceramic fiber material.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: February 5, 2008
    Assignee: Global Strategic Materials, LLC
    Inventors: Edward J. A. Pope, Kenneth M. Kratsch
  • Patent number: 7217386
    Abstract: High-density composites of alumina and titania with nano-sized grains are prepared from aluminum titanate without the need to use nano-sized powder as a starting material. The preparation is achieved by high-energy ball milling of the aluminum titanate followed by sintering at elevated temperature and pressure. The aluminum titanate can be prepared from micron-sized alumina and titania particles through plasma jet processing.
    Type: Grant
    Filed: August 2, 2004
    Date of Patent: May 15, 2007
    Assignee: The Regents of the University of California
    Inventors: Julin Wan, Amiya K. Mukherjee
  • Patent number: 7207424
    Abstract: A mixture of carbon-containing fibers, such as mesophase or isotropic pitch fibers, a suitable matrix material, such as a milled pitch is compressed while resistively heating the mixture to form a carbonized composite material. Preferably, the carbonized material has a density of at least about 1.30 g/cm3. Preferably, the composite material is formed in less than ten minutes. This is a significantly shorter time than for conventional processes, which typically take several days and achieve a lower density material. A treating component may be impregnated into the composite. Consequently, carbon/carbon composite materials having final densities of about 1.6–1.8 g/cm3 or higher are readily achieved with one or two infiltration cycles using a pitch or other carbonaceous material to fill voids in the composite and rebaking.
    Type: Grant
    Filed: November 24, 2003
    Date of Patent: April 24, 2007
    Assignee: UCAR Carbon Company Inc.
    Inventors: Dai Huang, Dave Snyder, Richard T. Lewis, Irwin C. Lewis
  • Patent number: 7175798
    Abstract: An improved cutting tool insert and a method for the preparation of such cutting tool insert, having a sintered alumina and silicon carbide whisker composite material body, comprising the steps of milling and mixing the powdered starting materials of said composite material and forming said material into a preformed workpiece, heating up said workpiece at a heating rate of from about 20 to about 60° C. per minute to a sintering temperature of between from about 1600 to about 2300° C., and holding at said sintering temperature for a holding time of from about 5 to about 60 minutes at a pressure of between from about 20 to about 100 MPa.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: February 13, 2007
    Assignee: Sandvik Intellectual Property AB
    Inventor: Gunnar Brandt
  • Patent number: 7148480
    Abstract: Optical windows for protecting infrared sensing instruments are manufactured from nano-sized crystallites by compressing the crystallites into a continuous mass under high pressure in the presence of a pulsed electric current, preferably one produced by spark plasma sintering. The resulting materials have excellent optical and mechanical properties that make them favorable as replacements for the conventional single-crystal sapphire.
    Type: Grant
    Filed: July 14, 2004
    Date of Patent: December 12, 2006
    Assignee: The Regents of the University of California
    Inventors: Guodong Zhan, Amiya K. Mukherjee, Subhash H. Risbud
  • Patent number: 7008573
    Abstract: Provided are an amorphous coke for a special carbon material characterized in that it is an amorphous coke obtained by blending a coal tar base heavy oil and/or a petroleum base heavy oil with a resin and subjecting the mixture to thermal decomposition polycondensation; it has a larger thermal expansion coefficient than that of a coke obtained from a heavy oil alone; and a molded article of the coke is shrunk by 0.3% or more in terms of a volume change rate before and after the treatment when it is subjected to graphitizing treatment, and a production process of an amorphous coke for a special carbon material characterized in that in subjecting a coal tar base heavy oil or a petroleum base heavy oil to thermal decomposition polycondensation, the raw material is blended with a resin to modify a coke crystal structure.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: March 7, 2006
    Assignee: Nippon Steel Chemical Co., Ltd.
    Inventors: Taisa Ikeda, Tetsusei Fukuda, Yoichi Kawano
  • Patent number: 6955776
    Abstract: The present invention relates to a method for fabricating a functional dental element, such as a crown. According to the invention, use is made of a three-dimensional printing technique. The major advantages of the invention are that no mold is needed anymore, which entails a considerable saving of costs, that a great accuracy is achieved, and that the element can be made of different materials.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: October 18, 2005
    Assignee: Nederlandse Organisatie voor toegepast-natuurwetenschappelijk Onderzoek TNO
    Inventor: Frits Kornelis Feenstra
  • Patent number: 6942729
    Abstract: A design for high pressure/high temperature apparatus and reaction cell to achieve ˜30 GPa pressure in ˜1 cm volume and ˜100 GPa pressure in ˜1 mm volumes and 20-5000° C. temperatures in a static regime. The device includes profiled anvils (28) action on a reaction cell (14, 16) containing the material (26) to be processed. The reaction cell includes a heater (18) surrounded by insulating layers and screens. Surrounding the anvils are cylindrical inserts and supporting rings (30-48) whose hardness increases towards the reaction cell. These volumes may be increased considerably if applications require it, making use of presses that have larger loading force capability, larger frames and using larger anvils.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: September 13, 2005
    Assignee: Diamond Materials, INC
    Inventor: Oleg A. Voronov
  • Patent number: 6925693
    Abstract: A method of fabricating a piezoelectric/electrostrictive device including a driving portion, a movable portion, and a fixing portion for holding the driving portion and the movable portion. The driving portion includes a pair of thin plate portions facing each other, and a film-like piezoelectric/electrostrictive element formed on at least a part of the outer surface of at least one of the thin plate portions. A ceramic green laminate including at least one ceramic green sheet constituting one of the thin plates and at least one ceramic green sheet having at least one hole formed thereon is formed. The ceramic green laminate is sintered to produce a ceramic laminate. A piezoelectric/electrostrictive element is formed by a film formation method on the outer surface of the thin plate portion of the ceramic laminate. The ceramic laminate is then cut with the piezoelectric/electrostrictive element formed thereon.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: August 9, 2005
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Toshikazu Hirota, Koji Kimura
  • Patent number: 6905649
    Abstract: A nano-sized powder of barium titanate is compacted and sintered by spark plasma sintering under conditions creating a high heating rate to achieve a densified material that demonstrates superior permittivity.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: June 14, 2005
    Assignee: The Regents of the University of California
    Inventors: Guodong Zhan, Amiya K. Mukherjee, Joshua D. Kuntz, Julin Wan
  • Patent number: 6893601
    Abstract: A carbon material is formed by heat-treating a carbonaceous material in a reaction mix of oxides of boron and boron nitride in a nitrogen atmosphere to temperatures of 1600 to 2000° C. The surface of the carbonaceous material is transformed into a carbon material that is resistant to oxidation to temperatures of 900° C., enabling machined components to be utilized for weeks at that temperature. The carbon material is also stable in inert or vacuum environments to temperatures in the range of 1500 to 2000° C., enabling its use as aluminum evaporative boats and the like.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: May 17, 2005
    Assignee: Equity Enterprises
    Inventors: Cressie E. Holcombe, Jr., Lloyd R. Chapman
  • Patent number: 6878331
    Abstract: A mixture of carbon-containing fibers, such as mesophase or isotropic pitch fibers, a suitable matrix material, such as a milled pitch is compressed while resistively heating the mixture to form a carbonized composite material. Preferably, the carbonized material has a density of at least about 1.30 g/cm3. Preferably, the composite material is formed in less than ten minutes. This is a significantly shorter time than for conventional processes, which typically take several days and achieve a lower density material. A treating component may be impregnated into the composite. Consequently, carbon composite materials having final densities of about 1.6-1.8 g/cm3 or higher are readily achieved with one or two infiltration cycles using a pitch or other carbonaceous material to fill voids in the composite and rebaking.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: April 12, 2005
    Assignee: UCAR Carbon Company Inc.
    Inventors: Dai Huang, Richard T. Lewis, Irwin C. Lewis, David Snyder
  • Patent number: 6878337
    Abstract: A process for producing a honeycomb structure, which comprises adding water to a mixed raw material of a raw material powder and a binder, kneading the mixture to obtain a plastic mixture, molding the plastic mixture into a honeycomb shape to obtain a green honeycomb structure, drying the structure by a step including hot-air drying, and firing the resulting dried honeycomb structure, wherein the binder contains hydroxypropyl methyl cellulose as a major component. The process can produce a crack-free high-quality honeycomb structure rapidly at a low cost.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: April 12, 2005
    Assignee: NGK Insulators, Ltd.
    Inventors: Yasushi Noguchi, Kyoko Makino
  • Patent number: 6858173
    Abstract: Composites of ceramic materials, notably alumina or metal oxides in general, with single-wall carbon nanotubes are consolidated by electric field-assisted sintering to achieve a fully dense material that has an unusually high fracture toughness compared to the ceramic alone, and also when compared to composites that contain multi-wall rather than single-wall carbon nanotubes, and when compared to composites that are sintered by methods that do not include exposure to an electric field.
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: February 22, 2005
    Assignee: The Regents of the University of California
    Inventors: Guodong Zhan, Amiya K. Mukherjee, Joshua D. Kuntz, Julin Wan
  • Patent number: 6844378
    Abstract: A method of producing three-dimensional particle structures with enhanced magnetic susceptibility in three dimensions by applying a triaxial energetic field to a magnetic particle suspension and subsequently stabilizing said particle structure. Combinations of direct current and alternating current fields in three dimensions produce particle gel structures, honeycomb structures, and foam-like structures.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: January 18, 2005
    Assignee: Sandia Corporation
    Inventors: James E. Martin, Robert A. Anderson, Rodney L. Williamson
  • Patent number: 6814917
    Abstract: A process for producing a polycrystalline alumina sintered body which includes the steps of: subjecting alumina powder to ultrasonic irradiation, mechanical stirring not using a grinding medium, or ultrasonic irradiation and mechanical stirring not using a grinding medium, resulting in slurry dispersed in a solvent; drying and forming the slurry to produce a green body; and then sintering the green body in an air atmosphere at a temperature in the range of 1400° C. to 1800° C.; wherein the alumina powder has: a purity of 99.99 wt % or more and includes &agr; alumina particles having polyhedral shape, having substantially no red surface and a D/H ratio of from 0.5 or more to 3.0 or less; the number-average particle size of from 0.1 &mgr;m or more to 1.0 &mgr;m or less; and a D90/D10 ratio of 7 or less.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: November 9, 2004
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Hisashi Watanabe, Yoshio Uchida
  • Publication number: 20040201137
    Abstract: A nano-sized powder of barium titanate is compacted and sintered by spark plasma sintering under conditions creating a high heating rate to achieve a densified material that demonstrates superior permittivity.
    Type: Application
    Filed: April 11, 2003
    Publication date: October 14, 2004
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporation
    Inventors: Guodong Zhan, Amiya K. Mukherjee, Joshua D. Kuntz, Julin Wan
  • Publication number: 20040180776
    Abstract: An improved cutting tool insert and a method for the preparation of such cutting tool insert, having a sintered alumina and silicon carbide whisker composite material body, comprising the steps of milling and mixing the powdered starting materials of said composite material and forming said material into a preformed workpiece, heating up said workpiece at a heating rate of from about 20 to about 60° C. per minute to a sintering temperature of between from about 1600 to about 2300° C., and holding at said sintering temperature for a holding time of from about 5 to about 60 minutes at a pressure of between from about 20 to about 100 MPa.
    Type: Application
    Filed: January 26, 2004
    Publication date: September 16, 2004
    Applicant: Sandvik AB
    Inventor: Gunnar Brandt
  • Publication number: 20040167009
    Abstract: High-density composites of ceramic materials, notably alumina or metal oxides in general, are formed by the incorporation of metal particles, of which niobium is a preferred example, and single-wall carbon nanotubes. The composites demonstrate an unusually high fracture toughness compared to the ceramic alone, and also when compared to composites that contain either the metal alone or single-wall carbon nanotubes alone. The two additives thus demonstrate a synergistic effect in improving the toughness of the ceramic.
    Type: Application
    Filed: February 26, 2003
    Publication date: August 26, 2004
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a California corporation
    Inventors: Joshua D. Kuntz, Guodong Zhan, Amiya K. Mukherjee