With Vitrification Or Firing Ceramic Material Patents (Class 156/89.11)
  • Publication number: 20030034113
    Abstract: A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibers (12). The laminates of fibers (12) are impregnated with the slurry and are stacked (14) on a mold (10). The stack (14) of laminates of fibers (12) is covered by a porous membrane (16), a breather fabric (18) and a vacuum bag (20). The vacuum bag (20) is evacuated and is heated to a temperature of 60° C. for 10 hours to produce a ceramic matrix composite. The ceramic matrix composite is then heated to a temperature of 1200° C. at atmospheric pressure to sinter the ceramic matrix composite.
    Type: Application
    Filed: September 18, 2002
    Publication date: February 20, 2003
    Inventors: Edwin G. Butler, Anthony G. Razzell, John Dominy, Paul A. Doleman, Ihsan A.H. Al-Dawery
  • Publication number: 20030019564
    Abstract: A thermally conductive adhesive sheet which has electric insulation, a high conductivity and a small thermal expansion coefficient, obtained by impregnating an inorganic continuously porous sintered substrate having a thermal conductivity of 20 W/(mk) or more and a thickness of 0.1 to 2 mm with an organometallic compound, heat-treating the organometallic compound to decompose the organometallic compound and to form an oxide or a complex oxide on continuous pore surfaces, then impregnating a resin liquid into the inorganic continuously porous sintered substrate.
    Type: Application
    Filed: July 23, 2002
    Publication date: January 30, 2003
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Kenji Shimada, Kazuyuki Ohya
  • Publication number: 20030019563
    Abstract: The present invention provides a method of manufacturing a low-temperature sintering multilayer ceramic wiring board comprising the steps of: forming a wiring layer by printing conductive paste (4) on an unfired green sheet (1); forming a laminate by laminating, on at least one side of a ceramic substrate, the unfired green sheet having the wiring layer; and firing the laminate. The present invention also provides paste for use with this method. In the firing step, after an adhesive layer (8) or binder resin in said green sheet used for lamination burns, glass ceramic in the green sheet starts to sinter, and upon or after the start of sintering of the glass ceramic, conductive particles in the conductive paste starts to sinter. This manufacturing method can provide an precise wiring board without pattern deformation and also provide a low-temperature ceramic multilayer wiring board that has no cracks in the glass ceramic on the periphery of electrodes and has electrodes of a dense film structure.
    Type: Application
    Filed: March 11, 2002
    Publication date: January 30, 2003
    Inventors: Masaaki Hayama, Kazuhiro Miura, Akira Hashimoto, Takeo Yasuho
  • Publication number: 20030010420
    Abstract: A monolithic ceramic waveguide laser body is made by forming and grinding two or more plates of alumina ceramic to produce internal and external features otherwise impossible to fabricate in a single ceramic body. The plates are bonded together by use of glass frit or by self-friting (diffusion bonding) methods to achieve a vacuum tight enclosure. The ceramic surfaces to be bonded have an “as ground” finish. One internal structure created by this method includes a channel of dimensions from 8 to 1.5 mm square or round that confines an RF or DC electrical discharge and comprises a laser resonator cavity. The channel can be ground to form a “V”, “U” or “Z” shape folded cavity. Another internal structure is a gas reservoir connected to the resonator cavity. Various other important features are described that can only be created by this method of building a laser. The plates are bonded together in a furnace at temperatures ranging between 450° C.
    Type: Application
    Filed: March 18, 2002
    Publication date: January 16, 2003
    Inventor: Clifford E. Morrow
  • Publication number: 20020195188
    Abstract: The aim of the invention is to produce a thin porous layer, with a defined porosity and also, a high strength. Said aim is achieved, whereby such a layer with open porosity is produced from a mixture, comprising a sinterable powder with a predetermined powder particle size distribution. The sintered layer is of a thickness, which corresponds to about triple the average diameter of the powder particles employed, has a pore diameter in the range from 0.01 to 50 &mgr;m and a tensile strength of in a range from about 5 to 500 N/mm2. The invention further relates to a method for the production of said thin porous layer with open porosity.
    Type: Application
    Filed: July 1, 2002
    Publication date: December 26, 2002
    Inventors: Andreas Kuhstoss, Thomas Rothig, Peter Neumann
  • Patent number: 6497776
    Abstract: A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibres (12). The laminates of fibres (12) are impregnated with the slurry and are stacked (14) on a mould (10). The stack (14) of laminates of fibres (12) is covered by a porous membrane (16), a breather fabric (18) and a vacuum bag (20). The vacuum bag (20) is evacuated and is heated to a temperature of 60° C. for 10 hours to produce a ceramic matrix composite. The ceramic matrix composite is then heated to a temperature of 1200° C. at atmospheric pressure to sinter the ceramic matrix composite.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: December 24, 2002
    Assignee: Rolls-Royce plc
    Inventors: Edwin G. Butler, Anthony G. Razzell, John Dominy, Paul A. Doleman, Ihsan AI-I Al-Dawery
  • Publication number: 20020189742
    Abstract: A glass ceramic multilayer substrate having a better flatness and a low sintering shrinkage ratio is made by sintering an unsintered laminated body formed by laminating together first and second green sheets capable of exhibiting different shrinking behaviors during a sintering process, thereby producing the desired glass ceramic multilayer substrate. When the shrinkage starting temperatures (° C.) of the first and second green sheets are TSa and TSb, the sintering process ending temperatures (°C.) of the first and second green sheets are TFa and TFb, and when the temperature rising speed is X° C./min, the respective parameters satisfy (TFa+3X)<TSb or (TFb+3X)<TSa.
    Type: Application
    Filed: June 5, 2002
    Publication date: December 19, 2002
    Inventors: Yoichi Moriya, Yasutaka Sugimoto, Osamu Chikagawa
  • Patent number: 6494979
    Abstract: An insulative body having first and second porous insulation members and a ceramic binder. Each of the first and second porous insulation members is formed of a fibrous, low-density silica-based material and cooperatively defines a joint. The ceramic binder is disposed between a pair of mating surfaces that form the joint. The ceramic binder couples the first and second porous insulation members together. A method for bonding insulative bodies to one another through the use of an ceramic/organic thermal setting binder is also provided.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: December 17, 2002
    Assignee: The Boeing Company
    Inventor: Robert A. DiChiara, Jr.
  • Publication number: 20020179225
    Abstract: A process for producing a fiber-reinforced, ceramic structural component comprising high-temperature resistant fibers which are reaction-bonded to a matrix of silicon carbide comprises the steps of coating bundles of fibers with pyrolysable binder and solidifying the binder, producing mixtures of fiber bundles, fillers and binders, pressing the mixtures to produce a pressed body, pyrolysing the pressed body under the exclusion of oxygen to form a porous, carbon-containing preform, infiltrating the preform with a silicon melt to form the silicon carbide matrix, in which various pressing compounds are produced, which contain fibers of different quality and in different proportions and different coatings. These pressing compounds are arranged at different levels and in different spatial directions in the press mould during the filling of the press mould. After the pressing, the regions produced in this way are retained in the press mould.
    Type: Application
    Filed: May 30, 2002
    Publication date: December 5, 2002
    Inventors: Thomas Behr, Manfred Kurbjuhn, Robert Michal, Michael Niestegge, Karl-Ludwig Weisskopf
  • Publication number: 20020174936
    Abstract: A cast-on-resist (COR) method of forming a ceramic layer (114) with a recessed pattern is provided according to a preferred exemplary embodiment of the present invention. The COR method is comprised of depositing a resist (102) on a substrate (104) and selectively exposing the resist (102) to a radiation source such that a first portion (106) of the resist (102) having a positive image of the pattern is soluble in a solvent and a second portion (108) of the resist (102) having a negative image of the pattern is insoluble in the solvent. The COR method is further comprised of immersing the resist (102) in the solvent to remove the first portion (106) to form a casting substrate (110) having the negative image of the pattern, applying ceramic slurry (112) on the casting substrate (110), curing the ceramic slurry (112) on the casting substrate (110) and removing the ceramic layer (114) from the casting substrate (110) after the curing.
    Type: Application
    Filed: May 25, 2001
    Publication date: November 28, 2002
    Applicant: Motorola, Inc.
    Inventors: Jeremy W. Burdon, Manuel Oliver
  • Publication number: 20020174935
    Abstract: Cast-on-resist (COR) methods of manufacturing patterned ceramic layers that can be used in forming a multilayered ceramic device are provided according to preferred exemplary embodiments of the present invention.
    Type: Application
    Filed: May 25, 2001
    Publication date: November 28, 2002
    Applicant: Motorola, Inc.
    Inventors: Jeremy W. Burdon, David L. Wilcox
  • Patent number: 6485590
    Abstract: A method of forming a multilayer ceramic coating system on a substrate that requires thermal protection from a hostile thermal environment. The method generally entails forming at least one tape that contains ceramic particles dispersed in an organic constituent, such as a binder and/or plasticizer. If a single tape is used, the tape is formed of multiple layers of different compositions and applied as a unit to the substrate, thereby forming at least an innermost layer and an outermost layer on the substrate. If multiple tapes are used, a first tape is applied to the substrate to form the innermost layer, and a second tape is applied to form the outermost layer. The tape/tapes are then sintered to form innermost and outermost ceramic layers, respectively, on the substrate.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: November 26, 2002
    Assignee: General Electric Company
    Inventors: Daniel P. Ivkovich, Jr., Andrew J. Skoog, Jane A. Murphy, Thomas W. Rentz
  • Publication number: 20020162618
    Abstract: The present invention is directed to a method of manufacturing of sintered bonded adhesive plates. The present invention comprises the steps of clearing the metal cores, applying thermosetting adhesives, such as phenolic or epoxy adhesives, to the core layer, then applying sintered layers on top of the adhesive layers and bonding said layers at a temperature in the range of 375-475 F, pressure in the range of 25-1000 psi and bonding such structure for at least 30 seconds. The metal core may be fabricated from metals whose melting point is at least 450 F, such as aluminum. The present invention presents a relatively inexpensive way of manufacturing sintered bonded adhesive plates.
    Type: Application
    Filed: May 4, 2001
    Publication date: November 7, 2002
    Inventors: David Landa, Barry Gindoff, Bob Hawkins, Raymond Engel
  • Publication number: 20020155264
    Abstract: In a green laminate body including a plurality of base green layers and a plurality of constraining green layers for forming a monolithic ceramic substrate by using a non-shrinking process, when the thicknesses of the base green layers differ from each other, a thicker base green layer shrinks largely during sintering, and hence, the resulting monolithic ceramic substrate may warp in some cases. In order to solve this problem, the constraining green layers, which are in contact with the main surfaces of the individual base green layers, have different thicknesses so that a relatively thicker constraining green layer is in contact with a relatively thicker base green layer, and a relatively thinner constraining green layer is in contact with a relatively thinner base green.
    Type: Application
    Filed: April 18, 2002
    Publication date: October 24, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Mitsuyoshi Nishide, Norio Sakai, Akira Baba
  • Patent number: 6467137
    Abstract: A method of manufacturing an ink jet recording head. On one and the other surfaces of an ink supply plate, formed with a plurality of discrete ink supply ports and a corresponding number of discrete nozzle ports, a green sheet for a pressure chamber plate and a green sheet for an ink pool plate are laminated, respectively. The resulting lamination is then sintered. A vibration plate is subsequently adhered to the pressure chamber plate formed by the sintering step and a nozzle plate is adhered to the sintered pool plate.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: October 22, 2002
    Assignee: NEC Corporation
    Inventors: Torahiko Kanda, Yasuhiro Otsuka, Kazuhiro Ikuina, Takaharu Kondo, Katsuhiro Notsu
  • Patent number: 6468374
    Abstract: The present invention describes an extrusion process for manufacturing a glass honeycomb structure having a variety of shapes and sizes depending on its ultimate application. Unlike prior art honeycomb structures made from ceramics, the inventive glass honeycomb can be readily viscously bent and/or redrawn. Furthermore, the inventive honeycomb structure is lightweight, yet able to support heavy loads on its end faces. Therefore, the inventive honeycomb can be used as a light-weight support for such objects as mirrors. These honeycombs can be used singularly or in aggregates to provide such support. Embodiments are described wherein the mass of the honeycomb is further reduced by removing select portions of the honeycomb without deleteriously impacting its ability for load bearing.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: October 22, 2002
    Assignee: Corning Incorporated
    Inventors: Gitimoy Kar, Kenneth E. Hrdina, John F. Wight, Jr., C. Charles Yu
  • Publication number: 20020146523
    Abstract: Very thin cast ceramic tape, preferably approximately 12 &mgr;m in thickness, is wrapped, preferably in a reversing spiral or helix, around a mandrel, preferably a mandrel made of steel and coated with a wax releasing agent, for so many times, preferably five or greater, as achieves a desired thickness of a tube wall, preferably about 100 &mgr;m. The green ceramic tube is then laminated in a pressure laminator, preferably a hydrostatic laminator at 3000 to 5000 psi, linking polymer chains between each ceramic layer, cross-linking polymer chains within each ceramic layer, and densifying the produced ceramic laminate tube by reducing porosity.
    Type: Application
    Filed: April 5, 2001
    Publication date: October 10, 2002
    Inventors: Alan D. Devoe, Mary Trinh
  • Patent number: 6455998
    Abstract: A composite material suitable for labeling a substrate. The composite material, which is preferably a ceramic composite, comprises a fired ceramic body and a layer thereon. The fired ceramic body includes a base layer that comprising a glassy phase and a refractory phase, the glassy phase being capable of wetting a substrate at an application temperature. There is sufficient color contrast between the top layer and the fired ceramic body such that a code pattern (e.g., a bar code) present (or formed) is optically discernible. Methods of making and using the same are also taught.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: September 24, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Kyung H. Moh, Daniel Lacave, Bernardus M. Sueoss
  • Publication number: 20020125618
    Abstract: A ceramic green sheet is manufactured by preparing a support which includes a releasing layer formed on its top surface and has a smoothness that at least a region of the top surface of the support to be coated with a ceramic slurry has substantially no projections having a height of equal to or more than about 1 &mgr;m, and applying a ceramic slurry to the releasing layer of the support, which ceramic slurry contains a ceramic powder dispersed in a medium. This ceramic green sheet has a small thickness of, for example, about 0.3 to 3 &mgr;m, has no depressions or through holes caused by a filler in the support and is excellent in smoothness.
    Type: Application
    Filed: October 5, 2001
    Publication date: September 12, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Toshiya Anahara, Ichiro Nakamura
  • Publication number: 20020124933
    Abstract: The thermocompression-bonding head (10) of the thermocompression-bonding apparatus (1) according to the present invention has a ceramic layer (15) having a predetermined thickness on the contact part (130a) of the pressing member (130) of the head body (13). The difference between the thermal expansion coefficient of the head body (13) and the thermal expansion coefficient of the ceramic layer (15) is within the range of ±30% at a temperature of 400° C. or less.
    Type: Application
    Filed: February 24, 2000
    Publication date: September 12, 2002
    Inventor: TSUTOMU NAGAOKA
  • Publication number: 20020117249
    Abstract: A method for making a ceramic body is provided wherein the ceramic components are joined in their green state. The method includes applying heat to the surfaces to be joined to cause a localized melting of the binder. The surfaces are then brought together and joined by alternately applying compression and stretching. The method is particularly advantageous for forming unitary ceramic arc tube bodies for high intensity discharge (HID) lighting applications.
    Type: Application
    Filed: February 15, 2002
    Publication date: August 29, 2002
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Gregory Zaslavsky, Christopher S. Nordahl, Joseph V. Lima, Arlene Hecker
  • Patent number: 6440242
    Abstract: Ground joint surfaces of two synthetic corundum pieces 4, 5 are supeposed on each other, and ends thereof are held in intimate contact with each other. The synthetic corundum pieces are then heated at a temperature equal to or lower than the melting point of synthetic corundum to joint the synthetic corundum pieces 4, 5.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: August 27, 2002
    Assignees: Japan Cell, Co., Ltd., Rion Co., Ltd.
    Inventor: Hajime Fukazawa
  • Patent number: 6440243
    Abstract: The invention includes a method for forming a ceramic composition. Materials comprising lead, zirconium, titanium and bismuth are combined together to form a mixture. At least one of the materials is provided in the mixture as a nanophase powder. The mixture is then densified to form the ceramic composition. The invention also includes a method for forming a dense ferroelectric ceramic composition. Lead, zirconium, titanium and bismuth are combined together to form a mixture. The mixture is then densified to form a ferroelectric ceramic composition having a density of greater than or equal to 95% of a theoretical maximum density for the composition. A predominate portion of the composition has a grain size of less than or equal to about 500 nanometers. The invention also includes a ferroelectric ceramic composition comprising lead, zirconium, titanium and bismuth.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: August 27, 2002
    Assignee: Honeywell International Inc.
    Inventors: Qi Tan, Jianxing Li
  • Publication number: 20020114932
    Abstract: A composite multilayered ceramic board includes a multilayered ceramic board made of dielectric ceramics, a multilayered ceramic board made of magnetic ceramics and an adhesive layer made of thermosetting resin such as polyimide and the like. In this composite multilayered ceramic board, the dielectric multilayered ceramic board and the magnetic multilayered ceramic board are joined through the adhesive layer.
    Type: Application
    Filed: December 28, 2001
    Publication date: August 22, 2002
    Inventors: Hideki Yoshikawa, Seiichirou Takahashi
  • Patent number: 6436221
    Abstract: A method of CNT field emission current density improvement performed by a taping process is disclosed. The method comprises following steps. First of all, a conductive pattern coated on a substrate by screen-printing a conductive slurry containing silver through a patterned screen is carried out. Thereafter, a CNT layer is attached thereon by screen-printing a CNT paste through a mesh pattern screen to form CNT image pixel array layer. The CNT paste consists of organic bonding agent, resin, silver powder, and carbon nano-tubes. After that the substrate is soft baked by an oven using a temperature of about 50-200° C. to remove volatile organic solvent. A higher temperature sintering process, for example 350-550° C. is then carried out to solidify the CNT on and electric coupled with the conductive pattern.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: August 20, 2002
    Assignee: Industrial Technology Research Institute
    Inventors: Yu-Yang Chang, Jyh-Rong Sheu, Cheng-Chung Lee
  • Publication number: 20020104602
    Abstract: A method of manufacturing a ceramic composite comprises the steps of preparing at least two ceramics bodies to be bonded together, each of the at least two ceramics bodies having a bonding surface; preparing a slurry in which primary particles of a bonding ceramic are dispersed; applying the slurry to the bonding surface of at least one of the ceramic bodies to be bonded; and sintering the ceramic bodies between which the slurry has been interposed to bond them. In this method, the bonding ceramic in the slurry is preferably constituted from the same ceramic starting material as that of the at least one of the ceramic bodies to be bonded. In this way, it becomes possible to manufacture, with a simple technique, a ceramic composite having a required strength and excellent biocompatibility and biosafety.
    Type: Application
    Filed: November 30, 1999
    Publication date: August 8, 2002
    Inventors: KAORU ARAI, MASAHIRO KOHKETSU, ASAKO MATSUSHIMA, MASANORI NAKASU
  • Patent number: 6428643
    Abstract: A method of casting toilets and the like where the bowl and rim are separately molded and then connected together while both are in an upside down position. During the connection of the rim to the bowl, the bowl is preferably supported on two opposing sides by the mold. These procedures reduce deformation of the cast bowl while it is still in a “greenware” condition. An apparatus for carrying out this method in an automated manner is also disclosed.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: August 6, 2002
    Assignee: Kohler Co.
    Inventors: Walter S. Bergquist, Frank P. Williams, Harold A. Teague
  • Publication number: 20020100536
    Abstract: An apparatus is disclosed for automatically casting separately molded bowl and rim members and then connecting them together while both are in an upside down position. During the connection of the rim to the bowl, the bowl is preferably supported on two opposing sides by the mold. These procedures reduce deformation of the cast bowl while it is still in a “greenware” condition.
    Type: Application
    Filed: March 22, 2002
    Publication date: August 1, 2002
    Inventors: Walter S. Bergquist, Frank P. Williams, Harold A. Teague
  • Patent number: 6413339
    Abstract: The present invention relates generally to a new metal/magnetic-ceramic laminate with through-holes and process thereof. More particularly, the invention encompasses a new process for fabrication of a large area ceramic laminate magnet with a significant number of holes, integrated metal plate(s) and co-sintered electrodes for electron and electron beam control. The present invention also relates to a magnetic matrix display (MMD), and electron beam source, and methods of manufacture thereof.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: July 2, 2002
    Assignee: International Business Machines Corporation
    Inventors: Govindarajan Natarajan, Jon A. Casey, Martin E. Klepeis, John U. Knickerbocker, Srinivasa S. N. Reddy, Robert A. Rita, Subhash L. Shinde
  • Patent number: 6410171
    Abstract: A component of a thermal processing apparatus for a fluid stream of hydrocarbons, a precursor glass for a glass-ceramic coating on such component and a method of inhibiting deposition of a material, such as carbon, on a surface of the component.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: June 25, 2002
    Assignee: Corning Incorporated
    Inventor: Thomas E. Paulson
  • Patent number: 6406578
    Abstract: Affixing together two articles includes placing a frit preform with an adhesive material on the surface of either article. The preform and the articles are heated to cause the frit material to liquify and then cooled to affix together the two articles at the junction of the two articles.
    Type: Grant
    Filed: October 19, 1999
    Date of Patent: June 18, 2002
    Assignee: Honeywell Inc.
    Inventors: Christina M. Schober, Timothy A. Beckwith, Shari L. Jossi, Stuart D. Olson, Thomas G. Ostertag
  • Publication number: 20020062904
    Abstract: A method and a device for sealing a ceramic package of a SAW (Surface Acoustic Wave) filter are disclosed, in which when making a ceramic package of an environmentally sensitive SAW filter such as a SAW duplexer filter or a SAW filter, a first sealing is carried out between a ceramic main body and a metal case so as to protect the chip component, and then, a second sealing is carried out also between the metal case and the ceramic main body again, so that the shielding effect against external electromagnetic fields would be superior, that a cost curtail and a workability improvement can be realized, and that the sealing can be made sure. The first sealing is carried out on a step which is formed on the top of the ceramic main body to bond the metal case thereupon. The second sealing is carried out on the top of the ceramic main body to bond the metal case on the ceramic main body.
    Type: Application
    Filed: May 14, 2001
    Publication date: May 30, 2002
    Applicant: SAMSUNG ELECTRO-MECHANICS CO.,LTD.
    Inventors: Seung Gyo Jeong, Ji Hwan Shin
  • Patent number: 6395117
    Abstract: Provided are a method for producing ceramic green sheets used for making a ceramic substrate which is reduced in cracking failure and improved in adhesion between laminated layers and is high in lamination property, high in strength and excellent in surface roughness, said method including heat-treating the ceramic powder having a specific particle size by dry grinding a ceramic powder to prepare ceramic powder having a specific average degree of aggregation and preparing a slurry using the ceramic powder so that a green density of the resulting ceramic green sheets is in a desired range, and a method for making a ceramic laminated substrate having excellent various properties by laminating the above ceramic green sheets and firing the laminate.
    Type: Grant
    Filed: October 1, 1999
    Date of Patent: May 28, 2002
    Assignee: NGK Insulators
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Hisanori Yamamoto, Katsuyuki Takeuchi
  • Patent number: 6379485
    Abstract: A method of manufacturing closed end ceramic fuel cell tubes with improved properties and higher manufacturing yield is disclosed. The method involves bonding an unfired cap to a hollow unfired tube to form a compound joint. The assembly is then fired to net shape without subsequent machining. The resultant closed end tube is superior in that it provides a leak-tight seal and its porosity is substantially identical to that of the tube wall. The higher manufacturing yield associated with the present method decreases overall fuel cell cost significantly.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: April 30, 2002
    Assignee: Siemens Westinghouse Power Corporation
    Inventor: Brian P. Borglum
  • Patent number: 6361735
    Abstract: The invention relates to a method of forming a composite article comprising the steps of forming a plurality of green ceramic elements, wherein the green ceramic elements are arranged side by side, and the green ceramic elements are spaced from each other by gaps; filling the gaps with a second material; and sintering the green ceramic elements with the second material to form the composite article. The second material, after being sintered, acts as a reflector layer to prevent substantially all light in one of the sintered ceramic elements from reaching an adjacent sintered ceramic element. The step of filling the gaps may be carried out by forming a slurry containing the second material in powder form and immersing the green ceramic elements in the slurry. The process of cosintering the green ceramic elements with the reflector composition provides improved dimensional control during sintering and reduces processing costs.
    Type: Grant
    Filed: September 1, 1999
    Date of Patent: March 26, 2002
    Assignee: General Electric Company
    Inventors: Venkat Subramaniam Venkataramani, Charles David Greskovich, Steven Jude Duclos, James Anthony Brewer
  • Patent number: 6358345
    Abstract: A method for producing a sponge like metallic structure of which density of pores is controllable, organic blanks are selected according to the shapes and sizes of the pores to be shaped and are dipped with organic medium, the blanks are agglomerated in a step of accumulation and are baked for shaping, the blanks and the organic medium thus form a shaped embryo by adhering. The embryo is processed by dipping with refractory mortar in vacuum, and is dried to form a refractory layer, then is dealt with by sintering in high temperature to effect carbonizing and disappearance of the blanks and organic medium by burning, and forms shaped ceramic shells distributed with mutually communicating pores and communicating areas and with gaps around the pores and communicating areas.
    Type: Grant
    Filed: November 16, 1999
    Date of Patent: March 19, 2002
    Inventor: Shao-Chien Tseng
  • Publication number: 20020026978
    Abstract: A multilayer ceramic substrate three-dimensionally including functional elements is provided. The functional elements, for example, a capacitor element, an inductor element or a resistor element, are prepared using plate-like sintered plates produced by firing ceramic functional material beforehand. These functional elements are included in an unsintered composite laminate. The unsintered composite laminate is provided with green layers for the substrate, restriction layers including sintering-resistant materials, and wiring conductors, and when it is fired, the green layers for substrate are prevented from shrinking in the direction of primary faces due to the function of the restriction layers. Therefore, the unsintered composite laminate can be fired without problems while the functional elements are included, and mutual diffusion does not occur between the functional elements and the green layers for substrate, so that the characteristics of the functional elements can be maintained even after firing.
    Type: Application
    Filed: August 27, 2001
    Publication date: March 7, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Hideyuki Harada, Hirofumi Sunahara, Hiroshi Takagi, Yukio Sakabe
  • Patent number: 6348115
    Abstract: A method for forming a ceramic diaphragm structure includes providing a laminate of a ceramic green substrate having at least one window and a plurality of layers, and a thin ceramic green sheet superimposed on the ceramic green substrate to cover the at least one window. The laminate is fired so that the ceramic green sheet provides a diaphragm portion protruding in a direction away from the at least one window, and the fired laminate is subjected to a second firing step under load.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: February 19, 2002
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Tsutomu Nanataki, Katsuyuki Takeuchi
  • Patent number: 6348424
    Abstract: A glass having an oxide-converted composition of 35 to 65 wt % of SiO2, 5 to 35 wt % of B2O3, 2 to 20 wt % of CaO, 5 to 25 wt % of Al2O3 where the ratio of CaO to Al2O3 is 1/1 to 1/2.5, 0.5 to 5 wt % of TiO2, 0.5 to 5 wt % of ZrO2, 0.5 to 5 wt % of ZnO, 0 to 5 wt % of MgO, 0 to 5 wt % of SrO, 0 to 5 wt % of BaO and 0 to 1 wt % of the total of group 1A element oxides such as Na2O, K2O and Li2O, or a glass having an oxide-converted composition of 10 to 45 wt % of SiO2, 20 to 50 wt % of CaO, 20 to 45 wt % of Al2O3, 0.1 to 5 wt % of MgO, 0.1 to 5 wt % of SrO, 0.1 to 5 wt % of BaO, 0.1 to 5 wt % of TiO2, 0.1 to 5 wt % of ZnO, 0.1 to 5 wt % of ZrO2 and 0 to 3 wt % of a group 1A element oxide has a low glass softening point, can be calcined as a composite with a variety of ceramics at a temperature below 1000° C., precipitates crystals during the calcination process, and can provide a glass ceramic exhibiting a low dielectric constant and a low dielectric loss.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: February 19, 2002
    Assignee: NEC Corporation
    Inventors: Ichiro Hazeyama, Kazuhiro Ikuina
  • Publication number: 20020014298
    Abstract: A porous ceramic laminate has a porous silicon nitride substrate and a porous silicon nitride separation film supported thereon and having minute pores of sizes capable of Knudsen separation or molecular sieve by sintering a porous silicon nitride substrate supporting a formed layer containing polysilazane at 800° C. in a nitrogen atmosphere.
    Type: Application
    Filed: March 2, 2001
    Publication date: February 7, 2002
    Inventors: Shigekazu Mase, Shigeo Nagaya, Junichiro Tsubaki, Kiyoshi Komura
  • Patent number: 6329111
    Abstract: Disclosed are a phosphor pattern which comprises a substrate having unevenness and a phosphor layer formed on the inner surface of a concave portion of the substrate, wherein the phosphor pattern thickness ratio (x)/(y) satisfies a range of 0.1 to 1.5, where when the length from the bottom of the concave portion to the top of a convex portion is L (&mgr;m), (x) is a thickness of the phosphor pattern formed on an uneven wall surface at a position of 0.9×L from the bottom of the concave portion toward the top of the convex portion, and (y) is a thickness of the phosphor pattern formed on the uneven wall surface at a position of 0.4×L from the bottom of the concave portion toward the top of the convex portion, and processes for preparing the same.
    Type: Grant
    Filed: January 22, 1997
    Date of Patent: December 11, 2001
    Assignee: Hitachi Chemical Company
    Inventors: Takeshi Nojiri, Hideyasu Tsuiki, Hiroyuki Tanaka, Yumiko Wada, Seiji Tai, Seikichi Tanno, Hajime Kakumaru, Kazuya Sato, Naoki Kimura, Ikuo Mukai
  • Patent number: 6314759
    Abstract: After a film made of SiO2 is formed on at least a part of a bonding surface of a first glass member, a part of or the whole bonding surface being formed with a metal film, a second glass member is hot-pressed against the bonding surface at a predetermined pressure and a predetermined temperature. As the second glass member is hot-pressed by way of the SiO2 film against the bonding surface of the first member made of glass or the like having its bonding surface formed with a metal film, the two glass members are firmly bonded together, the bonding surface would be less likely to peel off, and the metal film would not be damaged.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: November 13, 2001
    Assignee: Hamamatsu Photonics K.K.
    Inventor: Tokuaki Nihashi
  • Patent number: 6309491
    Abstract: A pottery article decorated with a selected rock, such as a lava rock, is prepared by shaping a pottery article, such as a vase, from pottery clay, then partially drying the vase and forming a hole in the side of the vase, large enough to force the rock into so that it will be held in place by the surrounding pottery clay. The edges of the hole are cut to a sharp angle. A multiplicity of smaller holes are formed in the pottery clay in the region around the rock to inhibit the cracking of the pottery from cracking due to shrinkage during subsequent drying and firing. The pottery is then dried at room temperatures for about two weeks. Optionally, the holes may be filled with a moist clay/glaze mixture and dried again. The article is then fired at a cone 08 for about twelve hours and cooled, then glazed by dipping in a glaze bath and firing again at a cone 05 for about six hours.
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: October 30, 2001
    Inventor: Inwoo Chang
  • Patent number: 6305195
    Abstract: An improved process for fabricating a refractory dielectric article, in particular silica optical fiber, is provided. The fabrication process involves joining of two elongated bodies—typically silica preforms—end-to-end by use of an isothermal plasma torch technique. A long preform made in this manner allows drawing of optical fiber with less down-time and waste than current processes. The plasma torch technique also produces low perturbations within the resultant preform, thereby increasing the amount of usable fiber.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: October 23, 2001
    Assignee: Agere Systems Guardian Corp.
    Inventors: James William Fleming, Jr., George John Zydzik
  • Patent number: 6267835
    Abstract: A method of bonding a metal to a ceramic or two ceramic materials including the steps of melting a polycrystalline magnesium orthosilicate compound; and applying the melted polycrystalline magnesium orthosilicate compound between two materials which are metal with a ceramic, or two ceramic materials, or two metallic materials, bonding using the polycrystalline magnesium orthosilicate to bond the two materials together.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: July 31, 2001
    Assignee: Eastman Kodak Company
    Inventors: Thomas N. Blanton, Dilip K. Chatterjee, Debasis Majumdar
  • Patent number: 6245172
    Abstract: A method for manufacturing high deformation piezoelectric actuators and sensors using a continuous tape manufacturing process is provided. The ceramic layer is dispensed between two metal/adhesive layers to form a composite tape and is tack welded together. Lengths of composite tape are heated and then cut into individual actuators. A special pattern punched in the tapes allows for ease of alignment of the layers of the actuators.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: June 12, 2001
    Assignee: Face International Corp.
    Inventor: Samuel A. Face, Jr.
  • Patent number: 6245171
    Abstract: The present invention relates generally to using at least one green sheet that is originally very thin with the help of at least one thicker green sheet. An adhesion barrier to build multi-layer ceramic laminates and process thereof is also disclosed. Basically, the present invention relates to a structure and method for forming laminated structures and more particularly to a structure and method for fabricating multi-density, multi-layer ceramic products using at least one very thin green sheet and/or at least one green sheet with very dense electrically conductive patterns on top of at least one thicker green sheet.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: June 12, 2001
    Assignee: International Business Machines Corporation
    Inventors: Govindarajan Natarajan, Krishna G. Sachdev, Abubaker S. Shagan
  • Publication number: 20010002606
    Abstract: A method for producing a ceramic slurry used for fabricating a ceramic electronic component includes a mixing and pulverizing step for mixing and pulverizing a ceramic powder having an average particle size of about 0.01 to 1 &mgr;m, a solvent and a dispersant by a dispersion process using a pulverizing medium, such as balls or beads, to obtain a mixed and pulverized slurry; and a high pressure dispersion step for performing high pressure dispersion at a pressure of about 100 kg/cm2 or more after a filtered binder solution is added to the mixed and pulverized slurry to obtain a dispersed slurry (final dispersed slurry), the filtered binder solution being prepared by dissolving a binder in a solvent, followed by filtration. A method for forming a ceramic green sheet and a method for fabricating a monolithic ceramic electronic component using the ceramic slurry are also disclosed.
    Type: Application
    Filed: November 30, 2000
    Publication date: June 7, 2001
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Ichiro Nakamura, Hiroyuki Kurihara
  • Patent number: 6241837
    Abstract: A method of producing ceramic articles with a relief image comprises the steps of providing a ceramic article formed with a relief image thereon, providing a planar transfer decal having an image corresponding to the relief image, perforating the transfer decal to form a plurality of perforations through the transfer decal, applying the perforated transfer decal to the ceramic article, and firing the ceramic article with the perforated transfer article in a kiln. A pin tool comprising an array of pins is used to perforating the transfer decal. The relief image of the ceramic article can be formed in a mold or by an impressing roll such that an internal angle formed by each element of the relief image with respect to a surface of the ceramic article is less than 50 degree, preferably less than 45 degree. Pressure is applied to the perforated transfer decal against the surface of the relief image of the ceramic article manually or mechanically prior to the firing step.
    Type: Grant
    Filed: May 5, 1999
    Date of Patent: June 5, 2001
    Inventor: Li Ho Lin
  • Patent number: 6242075
    Abstract: A multilayer ceramic device has top and bottom green ceramic layers machined and fired. Intermediate green ceramic layers are machined, have conductors laid down in the machined areas, are laminated, and are fired to form an enclosure layer. The areas of the layers which will be in contact with each other are coated with a bonding agent. The layers are aligned and bonded to form a structure having arbitrarily shaped, interior channels adjacent to the top and bottom layers which are not subject to detrimental nonplanarities.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: June 5, 2001
    Assignee: Hewlett-Packard Company
    Inventors: Clinton C. Chao, Daniel J. Miller, Hubert A. VanderPlas