Fusing Or Melting Inorganic Material Patents (Class 264/332)
  • Patent number: 6458731
    Abstract: Fused, crystalline eutectic material comprising aluminum oxycarbide/nitride-Al2O3.Y2O3 eutectics. Examples of useful articles comprising the fused eutectic material include fibers and abrasive particles.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: October 1, 2002
    Assignee: 3M Innovative Properties Company
    Inventor: Anatoly Z. Rosenflanz
  • Patent number: 6454822
    Abstract: Fused abrasive particles comprising eutectic material. The fused abrasive particles can be incorporated into abrasive products such as coated abrasives, bonded abrasives, non-woven abrasives, and abrasive brushes.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: September 24, 2002
    Assignee: 3M Innovative Properties Company
    Inventor: Anatoly Z. Rosenflanz
  • Patent number: 6451416
    Abstract: The present invention is a low density hybrid airfoil comprising a temperature resistant exterior layer and a tough, high impact resistant interior layer. Specifically, the airfoil comprises a monolithic ceramic exterior layer and a fiber reinforced ceramic matrix composite interior layer. Both the monolithic ceramic and fiber reinforced ceramic matrix composite are low density materials. Additionally, the monolithic ceramic is a high temperature resistant material, and the fiber reinforced ceramic matrix composite is a relatively high impact resistant structure. Encapsulating the airfoil with a temperature resistant exterior layer protects the airfoil in a high temperature environment, and supporting the airfoil with a high impact resistant, fiber reinforced ceramic matrix composite improves the overall impact resistance of the airfoil thereby resulting in a tough, high temperature resistant, low density airfoil.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: September 17, 2002
    Assignee: United Technologies Corporation
    Inventors: John E. Holowczak, Karl M. Prewo, Jayant S. Sabnis, William K. Tredway
  • Patent number: 6447852
    Abstract: The present invention relates to a method for manufacturing a diamond composite from diamond particles, comprising the steps of forming a work piece, heating the work piece and controlling the heating temperature and heating time so that a certain desired amount of graphite is created by graphitization of diamond particles, thereby creating an intermediate body, and infiltrating silicon or silicon alloy into the intermediate body. The invention also relates to a diamond composite produced by this method.
    Type: Grant
    Filed: March 4, 1999
    Date of Patent: September 10, 2002
    Assignee: Ambler Technologies, Inc.
    Inventors: Sergey Konstantinovitch Gordeev, Sergey Germanovitch Zhukov, Lija Vladimirovna Danchukova, Thommy Ekström
  • Publication number: 20020117771
    Abstract: A non-toxic, fire-retardant building material can be made on site, largely from available materials, without special tools or processes. The material cures through natural evaporation, without the application of artificial heat. The cured material has been tested to withstand a direct flame in excess of 1500° C. and is durable as most lightweight aggregate materials of similar thickness when formed into a structural panel or product. The material may be diluted by water as it is mixed and is suitable for spray application. The material has been successfully used as an exterior wall coating or a roof coating and has shown very desirable increase in “R” factor insulation ratings as well as providing a good fire retardant layer.
    Type: Application
    Filed: February 26, 2001
    Publication date: August 29, 2002
    Inventor: Sergio Barbosa
  • Publication number: 20020096802
    Abstract: The invention comprehends a silicon nitride sintered body having consistent qualities, a process for producing the same, a ceramic heater employing the silicon nitride sintered body as a substrate and a glow plug containing the ceramic heater as a heat source. In the production of a silicon nitride sintered body through a hot press method, a sintering aid protecting agent is added to the raw material. The employable protecting agents are metallic elements such as Ta, W and Mo and compounds of the metallic elements such as nitrides and silicides. Conversion of these elements and compounds to carbides occurs preferentially to reduction of the sintering aid. Thus, it becomes possible to suppress reduction of the sintering aid in a reducing atmosphere formed, for example, of carbon monoxide, which is generated particularly when a graphite pressing die is employed.
    Type: Application
    Filed: December 7, 2001
    Publication date: July 25, 2002
    Inventors: Shindo Watanabe, Masahiro Konishi
  • Publication number: 20020076575
    Abstract: The invention provides ceramic molded solid articles and methods for making these articles on the micron scale. Articles are molded from ceramic precursors, optionally using molds including at least one portion that is elastomeric.
    Type: Application
    Filed: August 27, 2001
    Publication date: June 20, 2002
    Inventors: Hong Yang, Pascal Deschatelets, George M. Whitesides
  • Publication number: 20020003318
    Abstract: Ceramic sintered bodies having a different thickness along a predetermined axial direction are manufactured in the following manner. At first, a ceramic formed body to be sintered having different thickness along the predetermined axial direction is accommodated in a hot press apparatus. An upper forming mold and a lower forming mold each having a forming surface corresponding to an upper surface and a lower surface of the ceramic formed body to be sintered are set. A pressure along the predetermined axial direction is applied to the ceramic formed body to be sintered via the upper forming mold and the lower forming mold while heating the ceramic formed body to be sintered to perform a hot press sintering thereof. A thickness of a ceramic sintered body in such a manner that a maximum thickness in the predetermined direction is not two times larger or more than a minimum thickness in the predetermined direction.
    Type: Application
    Filed: September 4, 2001
    Publication date: January 10, 2002
    Applicant: NGK Insulators, Ltd
    Inventors: Hiromichi Kobayashi, Satoru Yamada, Tetsuhisa Abe
  • Publication number: 20020000682
    Abstract: A process for controlling and thus predicting the microstructural bias of multi-phase composites to obtain preferential positioning of the component compounds in their morphology and position in the resulting microstructure to cause the grains of a first phase either to locate at the grain boundaries of a second phase, or to be homogeneously distributed in the second phase using both conventional manually mixing and advanced self-propagating high-temperature processing technologies. A process whereby a lower cost composite material performs comparably to a more expensive monolithic nature of higher performance material by causing the higher performance first phase grains to preferentially locate at the grain boundaries of the second phase during densification/fusing. A process to optimize the performance properties by preferentially biasing the microstructure to cause the phase which intrinsically has the preferred properties to influence and enhance the desired properties of the bulk composite material.
    Type: Application
    Filed: April 14, 2000
    Publication date: January 3, 2002
    Inventor: Kathryn V. Logan
  • Patent number: 6312626
    Abstract: A method of producing mullite fibers by inviscid melt spinning includes providing mullite and excess silicate, melting the mullite at a temperature of 1800-2500° C., and extruding the mullite through an orifice. Apparatus for carrying out the method preferably includes a boron nitride (BN) crucible and an argon atmosphere, with a melt temperature of around 2000° C., and a spinning pressure of around 276 kPa (40 psi).
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: November 6, 2001
    Inventors: Brian S. Mitchell, Zhijun Xiao, Haoyue Zhang
  • Patent number: 6306325
    Abstract: Ceramic sintered bodies having a different thickness along a predetermined axial direction are manufactured in the following manner. At first, a ceramic formed body to be sintered having different thickness along the predetermined axial direction is accommodated in a hot press apparatus. An upper forming mold and a lower forming mold each having a forming surface corresponding to an upper surface and a lower surface of the ceramic formed body to be sintered are set. A pressure along the predetermined axial direction is applied to the ceramic formed body to be sintered via the upper forming mold and the lower forming mold while heating the ceramic formed body to be sintered to perform a hot press sintering thereof. A thickness of a ceramic sintered body in such a manner that a maximum thickness in the predetermined direction is not two times larger or more than a minimum thickness in the predetermined direction.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: October 23, 2001
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiromichi Kobayashi, Satoru Yamada, Tetsuhisa Abe
  • Patent number: 6299815
    Abstract: A ceramic composition (sample) includes CaBi4Ti4O15 or another compound having a layered perovskite crystal structures and exhibiting ferroelectricity at ordinary temperature. The ceramic composition (sample) is then heated to a temperature higher than the melting point of the ceramic composition to make the ceramic composition molten or semi-molten. The ceramic composition is then annealed and solidified to yield a grain oriented ceramic (porcelain). This process can produce grain oriented ceramics from ceramic compositions mainly containing a compound having a layered perovskite crystal structure, and can improve electromechanical coefficients of piezoelectric ceramics containing a compound having a layered perovskite crystal structure.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: October 9, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Masahiko Kimura, Akira Ando
  • Patent number: 6149855
    Abstract: A method of manufacturing a building material includes the steps of directing molten volcanic magma from an underwater volcanic magma vent to a level above sea level via a tube formed from the magma; directing the molten volcanic magma into a mold on a floating barge; cooling the magma in the mold to form a building material; and removing the building material from the mold. The tube is formed by lowering a cap assembly over an underwater flowing volcanic magma vent and raising the cap such that the magam solidifies inside the cap perimeter where it is cold.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: November 21, 2000
    Inventor: Louis L. Watson
  • Patent number: 6103147
    Abstract: An apparatus and methods for manufacturing curved scintillation crystal detector plates uses hot forging of crystal material. Crystal material is brought to a temperature between its plastic temperature and its melting temperature, and it is pressed between a pair of dies having curved pressing surfaces. The heated crystal material may be a freshly-drawn ingot of crystal material, and the method for producing curved plates may include cutting the hot-forged ingot into individual plates.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: August 15, 2000
    Assignee: Saint-Gobain Industrial Ceramics, Inc.
    Inventor: Al Rybicki
  • Patent number: 5958814
    Abstract: A composite and monolithic refractory structure, particularly adapted for making furnaces for glassmaking or the like, constituted by a block-shaped component made of electro-cast refractory material based on oxides of aluminum, zirconium, silicon, and the like, having shapes and dimensions that are adapted for its uses, inside which at least one protective element is monolithically inserted; the protective element is highly resistant to the attack of molten glass baths or the like and is chosen among metals, noble metals, refractory metals, refractory materials, conventional and non-conventional ceramic materials, such as carbides, nitrides, borides, and the like, or graphite-based materials, alloys and/or compounds and/or composites thereof; the element is provided substantially in the shape of a plate that is shaped and sized so as to have a profile that is similar to the peripheral profile of the refractory block and is arranged, inside the block, so that its surfaces are located at, and proximate to, the
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: September 28, 1999
    Assignee: Refel S.p.A.
    Inventors: Giancarlo Dinelli, Alessandro Fantinel
  • Patent number: 5922261
    Abstract: Iron-rich material waste products, such as electric arc furnace dust, are formed with an organic binder into discrete shapes, such as briquettes and/or other solid shapes. The shapes can then be used in iron and steel making processes and the iron and heavy metal values in the waste product recovered.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: July 13, 1999
    Assignee: Covol Technologies, Inc.
    Inventor: George W Ford, Jr.
  • Patent number: 5900328
    Abstract: An improved materials transporting element useful for transporting materials in sliding contact with a ware plate, for instance in materials feeder equipment, has a high precision, durable, wear and abrasion resistant sliding surface. The transporting element may have a tetragonal zirconia polycrystal ceramic sliding surface for reciprocal sliding contact with the ware plate having a zirconia-alumina sliding surface. Alternatively, the transporting element may have a zirconia-alumina ceramic composite sliding surface with the ware plate having a tetragonal zirconia polycrystal ceramic sliding surface.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: May 4, 1999
    Assignee: Eastman Kodak Company
    Inventors: Dilip K. Chatterjee, Theodore R. Kolb, James J. Ross, Syamal K. Ghosh
  • Patent number: 5766537
    Abstract: A method is used for manufacturing a seamless tubular member by a plastic and metal powder mixture. A liquid DOP material is added into the plastic and metal powder mixture so as to soften the metal powder material and so as to decrease the melting point of the metal powder material to a melting point closer to that of the plastic material. The plastic and metal powder mixture and the liquid DOP solution material are disposed in a container of a protruding mechanism and are heated to a temperature greater than the melting point of the plastic material so as to melt the metal powder material and the plastic material simultaneously. The melted plastic and metal mixture is then injected into a mold cavity so as to form the seamless tubular member.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: June 16, 1998
    Inventor: Ching-Chung Chiu
  • Patent number: 5733489
    Abstract: A method of making an article which includes a suboxide of titanium, the method involving binding Magneli phase powder into the shape of an article and subjecting the bonded shape to heat treatment including the step of controlling the temperature and pressure of the heat treatment so that the heat treated article is substantially corrosion resistant and non-wicking in use.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: March 31, 1998
    Inventor: Andrew Hill
  • Patent number: 5723076
    Abstract: Method of manufacturing large polycrystalline plates from optical and scintillation materials consists in heating a crystalline blank up to the temperature of 0,5T.sub.melt. <T<T.sub.melt., where T.sub.melt. -melting temperature of the starting material, as well as thermomechanical deformation by means of profiled surface up to the double thickness of the plate to be obtained, after which the blank is deformed again at the same temperature using flat-parallel surface till the specified thickness. Such technology provides the obtaining of large polycrystalline plates of the specified geometrical form with the necessary sizes.
    Type: Grant
    Filed: April 2, 1996
    Date of Patent: March 3, 1998
    Assignee: Amcrys-H, Ltd.
    Inventors: Aleksandr Ivanovich Ilyukha, Fyodor Antonovich Osadchii, Vladimir Petrovich Seminozhenko, Aleksandr Antonovich Chernyshov, Lyudmila Sergeyevna Gordienko, Pyotr Nikolayevich Onoprienko
  • Patent number: 5720917
    Abstract: The invention aims to offer a method to manufacture a high-strength, high-reliability and low cost silicon nitride based sintered body which is not affected by the amount of metal impurities contained in the silicon nitride powder, without using high-purity silicon nitride powder, and can be sintered for a short sintering time. The invention uses silicon nitride and sintering aids, and the powder mixture containing 500-5000 ppm metal impurities is sintered at temperatures ranging from 1300.degree.-1900.degree. C., and under the conditions wherein the product of sintering temperature and sintering time ranges from 1.times.10.sup.5 to 10.times.10.sup.5 .degree. C. .multidot.seconds.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: February 24, 1998
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Matsuura, Takao Nishioka, Akira Yamakawa
  • Patent number: 5700404
    Abstract: A process and device for producing an optically pure polycrystalline salt body by melting a starting material for the salt and then introducing the melted material into a casting mould having a base which is kept at a temperature of 1.degree. C. to 50.degree. C. below the melting point of the material to form a solid crust on the base and then solidifying the entire melt to form the polycrystalline salt body.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: December 23, 1997
    Assignee: Siemens Aktiengesellschaft
    Inventor: Thomas Berthold
  • Patent number: 5672302
    Abstract: A method for preparing a ceramic article, the method comprising the steps of:1) compacting a mixture of particulate zirconium diboride and a zirconium oxide or zirconium oxide alloy or composite thereof which results in the formation of a block and2) sintering the block in a mixture of nitrogen and hydrogen to form a ceramic with a core comprising zirconia and a shell comprising zirconium nitride.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: September 30, 1997
    Assignee: Eastman Kodak Company
    Inventors: Dilip K. Chatterjee, Syamal K. Ghosh, Gregory S. Jarrold
  • Patent number: 5667717
    Abstract: A method of producing magnetic soft ferrite of the general formula: M.sub.x Zn.sub.1-x O.Fe.sub.2 O.sub.3 (M stands for one or more of Cu, Mn, Ni, Fe, Co and Mg; and X is in the range of 0.4-0.7) by melting and casting is disclosed. Melting is carried out under controlling evaporation of Zn-component in the material of the ferrite by disposing Zn-source around the material, sealing up the melting chamber as tight as possible, or under a pressurized gas atmosphere so as to obtain the product having uniform and precise composition.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: September 16, 1997
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Mitsuo Sugimoto, Akihiko Saito
  • Patent number: 5656216
    Abstract: An apparatus and process for making metal oxide sputtering targets from volatile and thermally unstable metal oxide powder by enveloping the metal oxide powder in at least one layer of a barrier material while the powder is hot-pressed using a graphite die assembly.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: August 12, 1997
    Assignees: Sony Corporation, Materials Research Corporation
    Inventors: Chi-Fung Lo, John Turn, David P. Strauss
  • Patent number: 5645747
    Abstract: A process for consolidating a composite material comprises the steps of forming a workpiece including a matrix interspersed with fibers, supporting the workpiece by an electrically conductive support, inductively heating the support and thereby conductively heating the workpiece, and applying pressure to the heated workpiece. We apply the pressure by passing the support and workpiece through spaced rolls. To keep the workpiece from sticking to the support (i.e., the mandrel), we use boron nitride as a release agent.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: July 8, 1997
    Assignee: The Boeing Company
    Inventors: Marc R. Matsen, Donald M. Montgomery, Susan V. Laurenti
  • Patent number: 5643514
    Abstract: The invention includes a process for producing a reaction bonded silicon carbide composite reinforced with coated silicon carbide fibers which is suitable for high temperature applications. The process includes the steps of coating SiC fibers with AlN, BN or TiB.sub.2 ; treating the coated fibers with a mixture of SiC powder, water and a surfactant; preparing a slurry comprising SiC powder and water; infiltrating the coated fibers with the slurry to form a cast; drying the cast to form a green body; and reaction bonding the green body to form a dense SiC fiber reinforced reaction bonded matrix composite.The invention further includes a SiC fiber reinforced SiC composite comprising a reaction bonded SiC matrix, a SiC fiber reinforcement possessing thermal stability at high temperatures and an interface coating on the fibers having chemical and mechanical compatibility with the SiC matrix and with the SiC fibers.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: July 1, 1997
    Assignee: The Carborundum Company
    Inventors: Stephen Chwastiak, Sai-Kwing Lau, Carl H. McMurtry, Gajawalli V. Srinivasan
  • Patent number: 5639531
    Abstract: A process for making a hybrid ceramic article is disclosed. The process involves embedding an array of refractory ceramic tiles in a fiber reinforced glass-ceramic matrix composite substrate. The hybrid ceramic article so formed exhibits high thermal stability and elevated temperature load-bearing ability.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: June 17, 1997
    Assignee: United Technologies Corporation
    Inventors: Otis Y. Chen, Harold M. Craig, Glenn M. Allen, David C. Jarmon
  • Patent number: 5633213
    Abstract: There is disclosed a method for producing a self-supporting ceramic body by oxidation of a molten precursor metal with a vapor-phase oxidant to form an oxidation reaction product and inducing a molten flux comprising said molten precursor metal through said oxidation reaction product. A second metal is incorporated into said molten flux during the oxidation reaction. The resulting ceramic body includes sufficient second metal such that one or more properties of said ceramic body are at least partially affected by the presence and properties of said second metal in the metallic constituent.
    Type: Grant
    Filed: February 21, 1995
    Date of Patent: May 27, 1997
    Assignee: Lanxide Technology Company, LP
    Inventors: Michael K. Aghajanian, Marc S. Newkirk, Christopher R. Kennedy, Robert C. Kantner, Michael A. Rocazella, Jerry G. Weinstein, Danny R. White, Gerhard H. Schiroky, William B. Johnson
  • Patent number: 5580510
    Abstract: Method of improving the toughness of SiC-based ceramics. SiC, , AlN, Al.sub.2 O.sub.3 and optionally .alpha.-Si.sub.3 N.sub.4 are hot pressed to form a material which includes AlN polytypoids within its structure.
    Type: Grant
    Filed: December 14, 1993
    Date of Patent: December 3, 1996
    Assignee: The Regents Of The University of Michigan
    Inventors: Tseng-Ying Tein, Gregory E. Hilmas
  • Patent number: 5530081
    Abstract: A plastic material composed of silicon carbide powder, polycarbosilane, organic solvent, and optionally boron compounds and/or other additives, preferably porosity agents; and the use of this plastic composition for producing shaped parts and semi-finished products by plastic shaping.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: June 25, 1996
    Assignee: Solvay Deutschland GmbH
    Inventor: Christoph Nover
  • Patent number: 5523074
    Abstract: Polyhedral .alpha.-alumina particles having a particle size on the order of a micrometer and high purity are prepared by maintaining a compression molded aluminum material having, on its surface, a binary compound of aluminum and oxygen atoms or a ternary compound of aluminum, oxygen and hydrogen atoms in an aluminum melt.
    Type: Grant
    Filed: July 1, 1993
    Date of Patent: June 4, 1996
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Akihiko Takahashi, Hiroshi Tabuchi
  • Patent number: 5498147
    Abstract: A powder molding press a die plate provided with a die having a die hole, a punch device to be inserted into the die hole and a hydraulic cylinder device attached to the punch device for driving the same, the hydraulic cylinder device being arranged coaxially with the punch device. A movable punch plate may be disposed on one side of the die plate in parallel thereto with a predetermined space and a punch adapter for securing the punch device to the punch plate may be also disposed. The punch device includes a plurality of punches disposed axially in series.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: March 12, 1996
    Assignee: Yoshizuka Seiki Co., Ltd.
    Inventors: Takeshi Katagiri, Masao Yamamoto, Tukasa Tajima, Siro Shirasaki
  • Patent number: 5480601
    Abstract: Method for producing an elongated sintered article, characterized by the steps including filling powder material in a pipe, carrying out plastic deformation of the pipe filled with the powder material, and heating the pipe filled with the powder material to burn and/or sinter the powder material.The method of the present invention is advantageously applicable to production of wire or rod of ceramics, particularly so called new ceramics or fine ceramics, sintered alloys or their combination, which are difficult of shaping or moulding by conventional process such as wire-drawing, rolling or extrusion of powder material and are difficult of machining or processing after the powder material is sintered.
    Type: Grant
    Filed: December 14, 1994
    Date of Patent: January 2, 1996
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Susumu Yamamoto, Teruyuki Murai, Nozomu Kawabe, Masaaki Tobioka
  • Patent number: 5478510
    Abstract: A process for the production of abrasive materials by pouring molten abrasive material into the spaces between plates of an assembly of moving cooling plates. The pour is followed by solidification and removal of the poured material (and size reduction of the removed material). The plates are maintained parallel and vertical throughout the pouring, solidification and removal steps, the latter being accomplished by separation of the plates by a conversion wheel. The motion of the plates is then reversed by the wheel to reassemble the plates for a new cycle of pour, solidification and removal.
    Type: Grant
    Filed: October 18, 1993
    Date of Patent: December 26, 1995
    Assignee: H.C. Starck GmbH & Co KG
    Inventors: Paul Moltgen, Martin Lutte, Karlheinz Glaisner, Herbert Siebold
  • Patent number: 5445772
    Abstract: A method of producing a patterned shaped article includes the steps of disposing at a prescribed position within a main form for molding the shaped article a projection-bristling form having a support member and a plurality of projections standing upright from the support member, charging a prescribed amount of dry pattern-course material for forming the pattern course of the shaped article into spaces defined by a prescribed number of projections of the bristling form, charging a base-course material for forming the base course of the shaped article into the main form including the remaining space of the bristling form not filled with the pattern-course material, removing the bristling form, causing the charged pattern-course material and base-course material to set into a shaped article, removing the shaped article from the main form and, optionally, sintering the shaped article.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: August 29, 1995
    Assignee: CCA Inc.
    Inventors: Hiroshi Uchida, Mituhiro Onuki, Hideo Watanabe
  • Patent number: 5439744
    Abstract: This invention relates generally to a novel directed metal oxidation process which is utilized to produce self-supporting bodies. In some of the more specific aspects of the invention, a parent metal (e.g., a parent metal vapor) is induced to react with at least one solid oxidant-containing material to result in the directed growth of a reaction product which is formed from a reaction between the parent metal and the solid oxidant-containing material. The inventive process can be utilized to form bodies having substantially homogeneous compositions, graded compositions, and macrocomposite bodies.
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: August 8, 1995
    Assignee: Lanxide Technology Company, LP
    Inventors: Terry D. Claar, Vilupanur A. Ravi, Philip J. Roach
  • Patent number: 5422055
    Abstract: A process for preparing a fiber reinforced, glass matrix composite article of manufacture. The process employs an aqueous wet-laid technique by forming a dilute aqueous slurry of solids comprising glass fibers, reinforcing fibers and binder material which may be partially or completely fibrous. The dilute aqueous slurry is destabilized and the solids are collected on a porous support means. They are then dewatered and dried to form the composite mat which can be hot-pressed into an article of manufacture. The hot-pressed article of manufacture may then be heated, in the absence of pressure, to a temperature above the softening point of the glass, but below the degradation temperature of the reinforcing fibers, to provide a lofted composite.
    Type: Grant
    Filed: April 6, 1993
    Date of Patent: June 6, 1995
    Assignee: The Dow Chemical Company
    Inventors: Selim Yalvac, Robert L. McGee
  • Patent number: 5389321
    Abstract: A SrO-Al.sub.2 O.sub.3 -2SrO.sub.2 (SAS) glass ceramic matrix is reinforced with CVD SiC continuous fibers. This material is prepared by casting a slurry of SAS glass powder into tapes. Mats of continuous CVD-SiC fibers are alternately stacked with the matrix tapes.This tape-mat stack is warm-pressed to produce a "green" composite. Organic constituents are burned out of the "green" composite, and the remaining interim material is hot pressed.
    Type: Grant
    Filed: September 16, 1993
    Date of Patent: February 14, 1995
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Narottam P. Bansal
  • Patent number: 5389605
    Abstract: In a process for producing a high-temperature superconductor from oxides of bismuth, strontium, calcium, copper and optionally of lead and including sulfates of strontium and/or barium, the oxides of bismuth, strontium, calcium, copper and optionally of lead in the desired molar ratio, and from 2 to 30% by weight of strontium sulfate and/or from 1 to 20% by weight of barium sulfate, each calculated according to the mixture of the oxides, are mixed intimately, the mixture is melted in a crucible of a platinum metal at temperatures from 870.degree. to 1600.degree. C., the melt is poured into permanent molds of desired form and size and is allowed to solidify slowly therein, and the moldings produced are freed from the permanent mold material and are annealed for from 6 to 200 hours at temperatures from 700.degree. to 900.degree. C. in an oxygen-containing atmosphere.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: February 14, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Joachim Bock, Preisler Eberhard
  • Patent number: 5378424
    Abstract: The present invention essentially relates to a process for curing pipe insulation, including the employment of a two-part mold and the utilization of a device for the passage of curing air through the mold and through a pipe insulation preform which is arranged around a core disposed within the mold. The process for the curing of insulating chutes constituted of a fibrous materials, such as wool or the like, completely avoids the formation of any burrs which can conceivably be formed between interengaging and cooperating mold halves, one of which is a female and the other a complementary male component. A sharp and flexible leading edge in the male part is arranged to come into contact with the inner surface of the female part and to slide therealong before making contact with a preform for producing the pipe insulation, which is preferably a thermal wool material.
    Type: Grant
    Filed: September 30, 1993
    Date of Patent: January 3, 1995
    Assignee: Oy Partek Ab
    Inventor: Osmo Soikkeli
  • Patent number: 5371068
    Abstract: To produce tubular molded parts made of high-temperature superconductor oxide material based on bismuth, calcium, strontium and copper, a homogeneous melt of the oxide with a specified stoichiometry is allowed to run at temperatures of 900.degree. to 1100.degree. C. into a casting zone rotating about its horizontal axis. The solidified molded part is removed from the casting zone and it is annealed for 4 to 150 hours at 700.degree. to 900.degree. C. in an oxygen-containing atmosphere. A plant for producing tubular molded parts includes a rotatably arranged mold (4, 9) which is provided at least at one end face with a front plate 6 which reduces its free cross section, a runner 7 extending into the interior of the mold (4, 9) and a crucible 8 arranged above the runner 7 which is capable of feeding the runner 7 with melt (cf. FIG. 2 A).
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: December 6, 1994
    Assignee: Hoechst AG
    Inventors: Eberhard Preisler, Joachim Bock, Johannes Holzem, Friedrich-Wilhelm Dorn
  • Patent number: 5368791
    Abstract: A method of producing a patterned shaped article includes the steps of disposing at a prescribed position within a main form for molding the shaped article a cell form having a plurality of cells arranged in a contiguous manner, charging a prescribed amount of dry pattern-course material for forming the pattern course of the shaped article into prescribed cells of the cell form, charging a base-course material for forming the base course of the shaped article into the remaining space of the main form not filled with the pattern-course material, removing the cell form, causing the charged pattern-course material and base-course material to set into a shaped article, removing the shaped article from the main form and, optionally, sintering the shaped article.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: November 29, 1994
    Assignee: CCA Inc.
    Inventors: Hiroshi Uchida, Mituhiro Onuki, Hideo Watanabe
  • Patent number: 5336454
    Abstract: A ceramic composition and method for making ceramic composites having superior erosion and corrosion resistance to molten metal. The composite includes mullite, aluminum nitride and boron nitride in combination. The composite may be hot pressed or cold formed and pressureless sintered into a desired shape.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: August 9, 1994
    Assignee: Advanced Ceramics Corporation
    Inventor: Lionel C. Montgomery
  • Patent number: 5328890
    Abstract: To produce more complex molded bodies from precursors of high-temperature superconductors based on the oxides of bismuth, strontium, calcium and copper, the homogeneous melt of these oxides is cast in molds at temperatures of 870.degree. to 1000.degree. C. In this process, the geometrically appropriately shaped molds are composed of a material having a melting point of at least 1000.degree. C. Finally, the molds containing solidified melt of the oxides of bismuth, strontium, calcium and copper are treated with dilute hydrofluoric acid at temperatures of 20.degree. to 90.degree. C. until the molds are dissolved.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: July 12, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Eberhard Preisler, Joachim Bock
  • Patent number: 5302328
    Abstract: A method is disclosed of fully densifying a plurality of preformed ceramic plates by axial compression of the billets along a wall defining a cylinder and cavity. A series of the plates are stacked along the wall with the smallest dimension of the billets aligned with the axis of the cavity. The billets have a ratio of the smallest dimension to the largest dimension in the range of 1:3 to 1:40. The largest dimension of each of the plates is less than the lateral dimension of the cavity to leave an annular space; the space is filled with a pseudo isostatic pressing medium. The assembly is hot pressed under sufficient pressure and heat to convert the plates to billets of substantially full density.
    Type: Grant
    Filed: July 19, 1983
    Date of Patent: April 12, 1994
    Assignee: Ceradyne, Inc.
    Inventor: Andre Ezis
  • Patent number: 5294387
    Abstract: A fiber-reinforced ceramic composite material reinforced by particle dispersion with improved fracture toughness comprised of a mullite matrix, and fibers and same or different kind of ceramic fine particles both dispersed within the mullite matrix is produced by a method comprising: dispersing mullite particles forming a matrix in a solution dissolving an organometallic macromolecular substance to prepare an impregnating solution, continuously passing fibers through said impregnating solution to uniformly impregnate the fibers with said impregnating solution, laminating said fibers to provide a laminated body, converting the organometallic macromolecular substance within said laminated body into a nonmeltable state, and performing sintering (or press sintering) of said laminated body in an inert gas and/or nitrogen gas. By press sintering K.sub.Ic of 10 MN/m.sup.3/2 or more is achieved.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: March 15, 1994
    Assignee: Noritake Co., Limited
    Inventors: Kikuo Nakano, Kenji Oshima, Misao Iwata, Takao Yamada
  • Patent number: 5288679
    Abstract: A superconducting copper oxide based wire exhibiting improved critical current density and method. A superconductor powder and a binder melt are mixed at a solids loading of at least 90% by weight. The binder is an ester wax with no more than about 0.25 weight percent extrusion-aiding additives. The ester wax has the general formula RCOOR' with R and R' being hydrocarbon chains of at least 6 carbons. The ester wax melting point is 40.degree.-100.degree. C.; its melt viscosity is 94-2000 centipoise. The mixture is shaped and heated in an oxidizing atmosphere at up to 120.degree. C./hr to 500.degree.-600.degree. C., and held at that temperature for a time sufficient to remove the binder and achieve a wire density of at least 50% of theoretical. The green wire is heated at 50.degree.-130.degree. C./hr to at least 920.degree. C., and held at 920.degree.-990.degree. C. to achieve 90% of theoretical density, then annealed in oxygen. The wire may be textured during the heating process or by seeding.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: February 22, 1994
    Assignee: GTE Laboratories Incorporated
    Inventor: Sophia R. Su
  • Patent number: 5284712
    Abstract: The occurrence of efflorescence has been reduced or eliminated in ceramic articles formed from a novel vitreously bonded cement-containing composition. The articles also exhibit improved strength, reduced firing shrinkage and increased frost resistance. The articles are produced by combining hydraulic cement containing calcium silicate and/or calcium aluminate components, vitrifiable inorganic powders forming molten liquid-flowing substances, and reactive or sinterable mineral powders selected from the group consisting of magnesium silicates, aluminum silicates and mixtures thereof; combining the ingredients with water to form a mixture; molding the mixture into an article; hardening the article by hydration; and firing the molded article to a maximum temperature of between about 1000.degree. C. to 1400.degree. C.
    Type: Grant
    Filed: September 25, 1992
    Date of Patent: February 8, 1994
    Inventors: Kazuyuki Kawai, Kazumasa Goto, Takayuki Shirai
  • Patent number: 5276011
    Abstract: A method of manufacturing a component of the tape or filament kind out of a material based on a superconducting oxide having a high critical temperature, wherein said material is formed while it is in the vitreous state,the method being characterized by the fact that the material is subsequently crystallized:in a first step under a magnetic field and at a temperature T.sub.l lying between the vitreous transition temperature T.sub.g and the crystallization temperature T.sub.x, during which step isolated microcrystallites of submicroscopic size develop and their c axes orient themselves parallel to one another because of said applied magnetic field; andin a second step at a temperature T.sub.2 close to the crystallization temperature, in which the existing nuclei grow while retaining the texture imparted to them during said first step.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: January 4, 1994
    Assignee: Alcatel Alsthom Compagnie Generale d'Electricite
    Inventor: Christian Belouet