Base Material Decomposed Or Carbonized Patents (Class 427/227)
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Patent number: 5558907Abstract: A fiber-reinforced ceramic composite material exhibiting high tensile strength, high fracture toughness and high-temperature oxidation resistance is produced by simultaneously depositing a thin coating layer of refractory metal carbide with fugitive carbon onto the fiber reinforcement prior to the subsequent densification with the ceramic matrix. The energy behind propagating matrix cracks in the resulting composite material are effectively dissipated by crack deflection/branching, fiber debonding and frictional slip through the relatively weak and compliant fiber coating layer. These energy release and arrest mechanisms sufficiently impede the driving force behind unstable crack propagation and render the cracks non-critical, thereby serving to blunt and/or divert propagating matrix cracks at or around the reinforcing fiber.Type: GrantFiled: September 8, 1995Date of Patent: September 24, 1996Assignee: Hyper-Therm High Temperature Composites, Inc.Inventor: Wayne S. Steffier
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Patent number: 5553366Abstract: The present invention provides an article, comprising: a fabric sheet which has been compacted using a heat shrink yarn; and a curable or hardenable resin coated onto the fabric sheet. The present invention involves compacting a fabric sheet to impart stretchability and conformability to the fabric while minimizing undesirable recovery forces. Suitable fabrics for compacting are fabrics which comprise fiberglass fibers which are capable of first being compacted and then being set or annealed in the distorted, state. The article may be in the form of an orthopedic bandage and may optionally contain a microfiber filler associated with the resin.Type: GrantFiled: March 27, 1995Date of Patent: September 10, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: James C. Novack, Scott A. Neamy, Matthew T. Scholz
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Patent number: 5547703Abstract: Disclosed is a method for forming improved Si-O containing coatings on electronic substrates. The method comprises heating a hydrogen silsesquioxane resin successively under wet ammonia, dry ammonia and oxygen. The resultant coatings have improved properties such as low dielectric constants.Type: GrantFiled: April 11, 1994Date of Patent: August 20, 1996Assignee: Dow Corning CorporationInventors: Robert C. Camilletti, Fredric C. Dall, Diana K. Dunn
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Patent number: 5523163Abstract: Disclosed are Si--O containing ceramics having a dielectric constant less than or equal to about 3.2 which is stable over time. These properties render the ceramics valuable on electronic substrates.Type: GrantFiled: March 10, 1995Date of Patent: June 4, 1996Assignee: Dow Corning CorporationInventors: David S. Ballance, Robert C. Camilletti, Diana K. Dunn
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Patent number: 5523035Abstract: A process for producing a carbon/carbon composite having a ceramic and carbon coating on its surface consists essentially of the steps of heating a carbon/carbon composite at a temperature of from 800.degree. to 1,700.degree. C., contacting the thus heated composite in the presence of hydrogen with at least one compound selected from the group consisting of halides and hydrides of Si, Zr, Ti, Hf, B, Nb and W in gaseous form to convert the surface of the carbon/carbon composite, in the absence of a carbon releasing gas, into a carbide ceramic layer and then forming a coating film consisting of both carbon and ceramic by vapor phase decomposition at a pressure of 5-100 Torr on said carbide ceramic.Type: GrantFiled: September 15, 1993Date of Patent: June 4, 1996Assignee: Nippon Oil Co., Ltd.Inventors: Yoshio Sohda, Yukinori Kude, Takefumi Kohno, Hiroshi Makino
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Patent number: 5507804Abstract: Polyethylene oxide (PEO) coatings providing improved biocompatibility for implantable medical devices are disclosed. The PEO coatings comprise functionalized end-capped PEO which is attached at one end to the medical device. The PEO compounds are then exposed to a high energy source for a time sufficient to cause the PEO compounds to form a cross-linked, insoluble network. These PEO coatings are able to survive ethylene oxide sterilization procedures with minimal loss of protein or cell repulsion ability.Type: GrantFiled: November 16, 1994Date of Patent: April 16, 1996Assignee: Alcon Laboratories, Inc.Inventor: Gerard Llanos
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Patent number: 5505984Abstract: A method for forming a biocompatible component from a biocompatible thermoplastic material and a biocompatible fibrous material using an isostatic press. The method includes the steps of placing the biocompatible thermoplastic material and the biocompatible fibrous material in a flexible container. The flexible container is then heated under pressure so as to cause the biocompatible thermoplastic material to encapsulate the biocompatible fibrous material. The flexible container is then cooled so as to form the biocompatible component.Type: GrantFiled: January 21, 1993Date of Patent: April 9, 1996Inventors: Garry L. England, Joel C. Higgins
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Patent number: 5498442Abstract: A fluidized bed reactor arrangement and method for forming a metal carbide coating on a substrate containing graphite in which a bed of particles inclusive of the substrate is fluidized using a fluidizing gas containing a metal halide vapor formed by reacting a metal halide gas with a carbide forming metal selected from Group IVb through VIIb of the periodic table and maintaining the temperature of the fluidized bed above 1500.degree. C.Type: GrantFiled: March 1, 1995Date of Patent: March 12, 1996Assignee: Advanced Ceramics CorporationInventor: Jeffery W. Lennartz
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Patent number: 5496374Abstract: The present invention provides for faster and stronger tissue-implant bonding by treating a ceramic implant with an ion beam to modify the surface of the ceramic. The surface modification can give the ceramic improved ion-exchange properties depending upon the particular ceramic and the type of ions used. In a preferred embodiment, a bioactive ceramic orthopaedic, dental, or soft tissue implant is bombarded with a beam of cations. When implanted in the body, the surface modification causes an increase in the release of critical ions, such as calcium or phosphorus, from the surface of the ceramic implant, and thereby accelerates implant-tissue bond formation.Type: GrantFiled: August 4, 1994Date of Patent: March 5, 1996Assignee: Southwest Research InstituteInventors: Cheryl Blanchard, Geoffrey Dearnaley, James Lankford, Jr.
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Patent number: 5482731Abstract: This document discloses a method for bonding a calcium phosphate coating to stainless steels or cobalt base alloys for bioactive fixation of artificial implants. The method consists essentially of the following successive steps: applying and thermally diffusing a layer of titanium or its alloys into the stainless steel or cobalt base alloy substrates, applying a calcium phosphate coating and thermally diffusing Ca.sup.2+ and PO.sub.4.sup.-3 ions of the calcium phosphate into the intermediate layer of the titanium or its alloys and finally, the hydrothermal processing of the calcium phosphate coating.Type: GrantFiled: April 29, 1994Date of Patent: January 9, 1996Assignee: Centro de Investigacion y de Estudios Avanzados Del IPNInventors: Gregorio Vargas-Gutierrez, Manuel Mendez-Nonell, Juan Mendez-Nonell, Armando Salinas-Rodriguez
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Patent number: 5455060Abstract: The present invention provides an article, comprising: a fabric sheet which has been compacted using a heat shrink yarn; and a curable or hardenable resin coated onto the fabric sheet. The present invention involves compacting a fabric sheet to impart stretchability and conformability to the fabric while minimizing undesirable recovery forces. Suitable fabrics for compacting are fabrics which comprise fiberglass fibers which are capable of first being compacted and then being heat set or annealed in the compacted state. The article may be in the form of an orthopedic bandage and may optionally contain a microfiber filler associated with the resin.Type: GrantFiled: October 25, 1993Date of Patent: October 3, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Scott A. Neamy, James C. Novack, Matthew T. Scholz
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Patent number: 5453290Abstract: A system for dental restorations comprising dental alloys for the manufacture of a substructure of the restoration and dental porcelains for coating the substructure. The porcelains have a relatively high thermal expansion coefficient, above 14.5 .mu.m/m..degree.C., and a relatively low firing temperature, below 950.degree. C. The alloys have adapted properties, a thermal expansion coefficient above 14.5 .mu.m/m..degree.C. and a solidus temperature of at least 1000.degree. C.Type: GrantFiled: November 16, 1993Date of Patent: September 26, 1995Assignee: Elephant Edelmetaal B.V.Inventor: Joseph M. van der Zel
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Patent number: 5441537Abstract: An improved metallic bone prosthesis having a porous coating for bone ingrowth or interlocking with bone cement is disclosed. The porous coating comprises two layers of generally ball-shaped metallic particles bonded together at their points of contact, e.g. by sintering, and defining between them a plurality of connected interstitial pores having an average pore size of from about 350 microns to about 500 microns. A high resistance to failure at the coating-substrate and bone-coating (or cement-coating) interfaces is achieved with the use of the improved prosthesis. Also disclosed are a novel method for affixing the porous coating to a metal substrate, and a knee joint prosthesis having bearing portions designed so that the function of said prosthesis closely approximates that of the natural knee.Type: GrantFiled: December 4, 1992Date of Patent: August 15, 1995Assignee: Howmedica Inc.Inventor: Robert V. Kenna
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Patent number: 5441536Abstract: An implant is produced by coating a core material with a calcium phosphate type compound and converting the coating layer into an apatite type ceramic layer by a hydrothermal treatment.Type: GrantFiled: February 12, 1993Date of Patent: August 15, 1995Assignee: Kabushiki Kaisya AdvanceInventors: Hideki Aoki, Masaru Akao, Yoshiharurayama Shin, Osamu Hayashi, Masahiko Yoshizawa
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Patent number: 5382318Abstract: This invention allows the surface of an austenitic stainless steel screw surface to be formed into a hard nitrided layer so as to harden and a part such as a screw head which is in contact with outside air is removed its own ultra hard surface layer in the hard nitrided layer by scouring or the like to be rust preventive. Even if the ultra hard surface layer is thus removed, an inner hard layer in the hard nitrided layer is present beneath the surface layer to be able to maintain a hard state of the screw surface. In the method for manufacturing the austenitic stainless steel screw according to the invention, upon forming said hard nitrided layer on the screw surface by nitriding, the austenitic stainless steel screw surface is cleaned with a fluorine- or fluoride-containing gas prior to nitriding.Type: GrantFiled: March 3, 1993Date of Patent: January 17, 1995Assignee: Daidousanso Co., Ltd.Inventors: Masaaki Tahara, Haruo Senbokuya, Kenzo Kitano, Teruo Minato
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Patent number: 5382453Abstract: Carbon coated carbide fibers are arranged in a predetermined pattern and shape around a silicon carbide coated graphite insert. Silicon carbide is infiltrated into the silicon carbide fibers to produce a SiC/SiC composite component. The SiC/SiC composite component is coated with glass and is then heated in air to burn out the graphite insert to form a hollow glass coated SiC/SiC composite component. The method is suitable for producing hollow SiC/SiC composite turbine blades or vanes.Type: GrantFiled: August 31, 1993Date of Patent: January 17, 1995Assignee: Rolls-Royce plcInventor: Stephen Mason
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Patent number: 5380567Abstract: The present invention relates to a method of forming a coating on a substrate in the absence of oxygen. The method comprises coating the substrate with a solution comprising a solvent and hydrogen silsesquioxane resin. The solvent is evaporated and a preceramic coating thereby deposited on the substrate. The preceramic coating is then heated to a temperature of between about 500.degree. up to about 1000.degree. C. under an inert gas atmosphere. The process of the invention is useful for forming protective coatings on any substrate prone to oxidation. The present invention also relates to the formation of additional coatings on the coating formed above.Type: GrantFiled: June 15, 1993Date of Patent: January 10, 1995Assignee: Dow Corning CorporationInventor: Loren A. Haluska
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Patent number: 5346717Abstract: A method of preparing the fitting surface of a dental ceramic body for subsequent bonding to a tooth with, for example, glass polyalkenoate and resin based cements, including the step of depositing, by a vapour phase deposition technique, directly onto the fitting surface of the ceramic body a strongly adherent coating of an inorganic substance such as tin oxide at a thickness ideally less than 2 microns, the coating being reactive with the cement to provide a durable chemical bond therewith which is not subject to chemical degradation in the oral environment and which will not compromise the aesthetics of the associated dental restoration.Type: GrantFiled: January 12, 1993Date of Patent: September 13, 1994Assignee: The Victoria University of ManchesterInventor: Paul V. McCrory
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Patent number: 5318797Abstract: Spherical particles include a core of a polymer and a metal compound covering the polymer core. These particles may be formed by homogeneously dispersing particles of a polymeric compound in an aqueous solution of a hydrolyzable metal salt to form a uniform metal layer around the spherical particles. The spherical particles can also include a core of carbon and a metal compound covering the carbon core or the particles can have a hollow core prepared by heating spherical polymer particles coated with a metal compound to a temperature of 150.degree. C. or higher in the presence of oxygen to completely decompose the polymeric compound. These spherical particles are useful in electronic materials, magnetic materials and the like.Type: GrantFiled: June 20, 1990Date of Patent: June 7, 1994Assignees: Clarkson University, Japan Synthetic Rubber Co., Ltd.Inventors: Egon Matijevic, Nobuo Kawahashi
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Patent number: 5283083Abstract: The present invention concerns a method for preparing metal borate.The method consists in forming a metal ligand and a boron alkoxide and to react them to form a metal-borate precursor, which is then thermally treated to form an inorganic film on a substrate.The method is especially useful to prepare beta barium borate layers which can serve in non-linear optical devices to produce second harmonics generation.Type: GrantFiled: October 1, 1992Date of Patent: February 1, 1994Assignee: Eastman Kodak CompanyInventors: Gustavo R. Paz-Pujalt, Wenjiang Nie
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Patent number: 5248705Abstract: A method for forming a porous carbonaceous preform comprises, forming a mixture comprised of up to about 50 volume percent of furfuryl alcohol or tetrahydrofurfuryl alcohol, about 1 to 10 volume percent of a nonionic polyethylene oxide polymer ranging in molecular weight from about 100,000 to 5,000,000, about 30 to 80 volume percent of a carbonaceous material, and the balance water. The mixture is cast to form a body, and heated to decompose the polymer and form the porous preform. A molding composition for carbonaceous material comprises, up to about 50 volume percent of furfuryl alcohol or tetrahydrofurfuryl alcohol, about 1 to 10 volume percent of a nonionic polyethylene oxide polymer ranging in molecular weight from about 100,000 to 5,000,000, about 30 to 80 volume percent of the carbonaceous material, and the balance water.Type: GrantFiled: March 29, 1993Date of Patent: September 28, 1993Assignee: General Electric CompanyInventors: Henry C. McGuigan, William B. Hillig, Peter J. Merschter
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Patent number: 5238619Abstract: A method for forming a porous carbonaceous preform includes forming a mixture comprised of up to about 50 volume percent of furfuryl alcohol or tetrahydrofurfuryl alcohol, about 1 to 10 volume percent of a nonionic polyethylene oxide polymer ranging in molecular weight from about 100,000 to 5,000,000, about 30 to 80 volume percent of a carbonaceous material, and the balance water. The mixture is cast to form a body, and heated to decompose the polymer and form the porous preform. A molding composition for carbonaceous material includes, up to about 50 volume percent of furfuryl alcohol or tetrahydrofurfuryl alcohol, about 1 to 10 volume percent of a nonionic polyethylene oxide polymer ranging in molecular weight from about 100,000 to 5,000,000, about 30 to 80 volume percent of the carbonaceous material, and the balance water.Type: GrantFiled: March 30, 1992Date of Patent: August 24, 1993Assignee: General Electric CompanyInventors: Henry C. McGuigan, William B. Hillig, Peter J. Meschter
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Patent number: 5228701Abstract: An article, such as a seal ring, suitable for reduction of chatter when used in stuffing boxes with reciprocating stems. The article has an amorphous carbon phase at the surface of the article with the amorphous carbon phase extending into the article from the surface.Type: GrantFiled: September 28, 1990Date of Patent: July 20, 1993Assignee: UCAR Carbon Technology CorporationInventors: Ronald A. Greinke, Ronald A. Howard
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Patent number: 5225251Abstract: A process for forming layers on a substrate including irradiating at least part of an aluminum nitride surface with a high power ultraviolet emitter resulting in the elimination of the nitride component to form an aluminum layer. The aluminum layer is then reinforced by a metal.Type: GrantFiled: September 11, 1992Date of Patent: July 6, 1993Assignee: Asea Brown Boveri AktiengesellschaftInventor: Hilmar Esrom
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Patent number: 5225283Abstract: A process for forming a high temperature oxidation resistant coating on a carbon-carbon composite is disclosed and claimed. The process comprises applying a cyclosiloxane monomer blend containing a filler such as silicon carbide to a carbon-carbon composite, polymerizing and pyrolyzing said blend to form a filled black glass protective coating on the carbon-carbon composite.Type: GrantFiled: April 24, 1987Date of Patent: July 6, 1993Assignee: Allied-Signal Inc.Inventors: Roger Y. Leung, Bryan A. Weyneth
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Patent number: 5217657Abstract: A process for making 2D and 3D carbon-carbon composites having a combined high crystallinity, high strength, high modulus and high thermal and electrical conductivity. High-modulus/high-strength mesophase derived carbon fibers are woven into a suitable cloth. Layers of this easily graphitizible woven cloth are infiltrated with carbon material to form green composites. The carbonized composite is then impregnated several times with pitch by covering the composite with hot pitch under pressure. The composites are given a heat treatment between each impregnant step to crack up the infiltrated carbon and allow additional pitch to enter the microstructure during the next impregnation cycle. The impregnated composites are then given a final heat treatment in the range 2500.degree. to 3100.degree. C. to fully graphitize the fibers and the matrix carbon. The composites are then infiltrated with pyrolytic carbon by chemical vapor deposition in the range 1000.degree. C. to 1300.degree. C. at a reduced. pressure.Type: GrantFiled: October 28, 1991Date of Patent: June 8, 1993Inventor: Glen B. Engle
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Patent number: 5204168Abstract: Metal laminates pre-coated with powder-base paints and capable of being plastically deformed, wherein the coating layer comprises at least one polymeric compound, one cross-linking compound, one spreading compound, various additives, pigments and/or dyes and at least one filler, with said filler and/or said pigments being constituted, at least partially, by natural substances or substances of artificial origin, having a lamellar and/or acicular morphology, characterized in that the ratio of the largest dimension to the smallest dimension of the individual particles is higher than 2, with the granulometric distribution being such that the average equivalent sphere diameter is comprised within the range of from 0.2 to 4 micrometers.Type: GrantFiled: May 30, 1991Date of Patent: April 20, 1993Assignee: Otefal S.p.A.Inventors: Roberto Rota, Gavino Mura
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Patent number: 5192471Abstract: A carbon/carbon composite is prepared by impregnating a bundle of carbon fibers with a polymer of a nitrogen-containing heterocyclic compound, carbonizing the thus-impregnated carbon fiber bundle under pressure or under pressing and, optionally, further carbonizing the thus-carbonized carbon fiber bundle at atmospheric pressure.Type: GrantFiled: May 10, 1991Date of Patent: March 9, 1993Assignee: Nippon Oil Company, LimitedInventors: Seiichi Uemura, Yoshio Sohda, Osamu Kato, Takefumi Kouno, Tsutomu Kihara
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Patent number: 5187147Abstract: A process for producing a freestanding high Tc superconducting thin film is disclosed, which comprises providing a carbon substrate, depositing a high Tc superconducting thin film on the substrate and removing the carbon substrate by converting the carbon substrate to a gaseous composition at a temperature insufficient to cause thermal damage to said superconducting thin film but greater then 500.degree. C. in an oxygen containing atmosphere.Type: GrantFiled: October 1, 1991Date of Patent: February 16, 1993Assignee: Florida State UniversityInventors: Hon-Kie Ng, Snezana Kilibarda-Dalafave
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Patent number: 5186873Abstract: A carbon/carbon composite is prepared by polymerizing a polycyclic aromatic compound in the presence of a coupling agent, then impregnating a bundle of carbon fibers with the resulting polymer, then carbonizing the thus-impregnated carbon fiber bundle under pressure or under pressing, and optionally, further carbonizing the thus-carbonized carbon fiber bundle at atmospheric pressure.Type: GrantFiled: May 10, 1991Date of Patent: February 16, 1993Assignee: Nippon Oil Company, LimitedInventors: Seiichi Uemura, Yoshio Souda, Osamu Kato, Takefumi Kouno, Tsutomu Kihara
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Patent number: 5178908Abstract: A process for coating a carbonized material with metal is disclosed, wherein a chlorine-containing resin mixture is coated with Cr or Fe-Cr alloy to a thickness of substantially several microns. The coated product is then heated in an inactive atmosphere to carbonize the resin mixture. The process sufficiently coats a metal onto a carbonized material using relatively simple steps.Type: GrantFiled: November 5, 1990Date of Patent: January 12, 1993Assignee: Mitsubishi Pencil Co., Ltd.Inventor: Takao Koyama
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Patent number: 5175025Abstract: Sizing agent for carbonizable fiber contains a high molecular compound having a weight average molecular weight of not less than 10,000 as obtainable by reacting (A) a polyalkylene oxide compound having a weight average molecular weight of not less than 100 as obtainable by addition-polymerizing an ethylene oxide-containing alkylene oxide with an organic compound containing two active hydrogen groups with (B) a polycarboxylic acid or the corresponding anhydride or lower alkyl ester or a diisocyanate. The sizing agent not only inhibits napping and binds fiber but, because of its good thermal decomposition behavior, does not cause glueing of fiber so that a substantial upgrading of carbon fiber is achieved without detracting from its strength. Furthermore, as the sizing agent does not become a tar, deposits within the carbonizing furnace are minimized and the trouble of furnace obstruction prevented.Type: GrantFiled: February 1, 1991Date of Patent: December 29, 1992Inventor: Hiroyoshi Asano
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Patent number: 5166001Abstract: Preceramic compositions which are useful in providing protective ceramic coatings on carbon/carbon composites, graphite, and other carbonaceous materials are prepared by dispersing about 0.4-1.5 parts by weight of silicon carbide, silicon nitride, or a mixture thereof in a solution of one part by weight of a polysilazane in about 2.5-10 parts by weight of a liquid aromatic hydrocarbon.Type: GrantFiled: March 4, 1988Date of Patent: November 24, 1992Assignee: Ethyl CorporationInventor: Leonard M. Niebylski
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Patent number: 5145741Abstract: In a preferred embodiment room temperature electrically conductive or semiconductive ceramic paths or areas are produced on carbide and nitride ceramic substrates by a process of controlled oxidation using localized thermal heating (e.g., laser heating) by tracing desired paths onto the substrates, where air is the source of oxygen. In another embodiment, nitride and carbide ceramic substrates are converted to electroconductive or semiconductive ceramics where the substrate is characterized as whiskers, fibers, flakes or platelets whose dimensions are in the micron range, by controlled oxidation as prescribed by laser beam processing.Type: GrantFiled: February 28, 1991Date of Patent: September 8, 1992Inventor: Nathaniel R. Quick
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Patent number: 5118646Abstract: A process for improving the strength of components manufactured from sialon comprising heating and components at a temperature of from about 750.degree. to 950.degree. C. for from about eight to thirty-six hours in an oxygen-containing atmosphere.Type: GrantFiled: November 21, 1990Date of Patent: June 2, 1992Assignee: Norton CompanyInventors: Kerry N. Siebein, Russell Yeckley, Claude Brown, Jr.
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Patent number: 5116785Abstract: A method for forming a layer of a Group II or III fluoride on a semiconductor substrate (e.g. as epitaxial insulating layer) comprising vaporizing a precursor (I), where M is Be, Ca, Sr, Ba or lanthanide, b and d are 0 or 1. A, B, C and D are independently (IIA) or (IIB), X being O, S, NR, PR where R is H, alkyl, perfluoroalkyl; Y is perfluoroalkyl, fluoroalkenyl, fluoroalkylamine or fluoroalkenylamine; Z is H, F, alkyl, perfluoroalkyl or perfluoroalkenyl; and then decomposing the precursor vapor to form M fluoride. A preferred precursor for calcium fluoride is calcium 1,1,1,5,5,5-hexafluor-2,4-pentanedione complex where b and d are 0.Type: GrantFiled: November 30, 1990Date of Patent: May 26, 1992Assignee: The Secretary of State for Defence in her Britannic Majesty's Government of The United Kingdom of Great Britian and Northern IrelandInventors: Kevin J. Mackey, Anthony W. Vere, Donald C. Bradley, Dario M. Frigo, Marc M. Faktor, deceased
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Patent number: 5071671Abstract: A focused ion beam is irradiated on a predetermined area of a substrate on which a film is to be formed, and a vapor stream of film-forming depositable material is directed onto a localized area of the substrate which is being irradiated with the focused ion beam to convert the film-forming material to a film deposit on the predetermined area of the substrate. The process can be used to repair white-spot defects in masks and to otherwise deposit films having sharply defined edges and widths in the submicron range.Type: GrantFiled: October 24, 1989Date of Patent: December 10, 1991Assignee: Seiko Instruments Inc.Inventors: Yoshitomo Nakagawa, Takashi Kaito, Hisao Houjyo, Masahiro Yamamoto
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Patent number: 5069937Abstract: A method of preparing a roughened substrate surface for subsequent coating with a fluorocarbon polymer in a liquid medium. The surface of the substrate is thermally sprayed with a stainless steel alloy containing from 25 to 35 percent by weight of chromium. A metal-coated substrate produced by this method and an article having thereon a fluorocarbon surface coated by this method are also described.Type: GrantFiled: February 26, 1990Date of Patent: December 3, 1991Assignee: Whitford Plastics LimitedInventor: Nicholas J. Wall
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Patent number: 5066515Abstract: A method of forming an artificial diamond, comprising applying a laser beam to a glassy solid carbon material, while moving a point on the glassy solid carbon material at which the laser beam is applied, to form a locally fused portion thereon, whereby every part of the locally fused portion is cooled as the point moves away therefrom. During cooling of the locally fused portion, an artificial diamond is formed in adjacent regions on both sides of the solidified locally fused portion.Type: GrantFiled: July 16, 1990Date of Patent: November 19, 1991Assignee: Mitsubishi Materials CorporationInventor: Yuzoh Ohsawa
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Patent number: 5061414Abstract: A process for making a carbon-carbon composite having a combination of high crystallinity, high strength, high modulus and high thermal and electrical conductivity. High-modulus/high-strength mesophase derived carbon fibers are woven into a suitable cloth. Layers of this easily graphitizable woven cloth are covered with petroleum or coal tar pitch and pressed at a temperature a few degrees above the softening point of the pitch to form a green laminated composite. The green composite is restrained in a suitable fixture and heated slowly to carbonize the pitch binder. The carbonized composite is then impregnated several times with pitch by covering the composite with hot pitch under pressure. The composites are given a heat treatment between each impregnation step to crack up the infiltrated carbon and allow additional pitch to enter the microstructure during the next impregnation cycle. The impregnated composites are then given a final heat treatment in the range 2500.degree. to 3000.degree. C.Type: GrantFiled: September 5, 1989Date of Patent: October 29, 1991Inventor: Glen B. Engle
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Patent number: 5043185Abstract: An electroacoustic diaphragm is provided, which diaphragm comprising a pyrolytic graphite film obtained from a polymer selected from polyoxadiazole, an aromatic polyimide obtained by polycondensation of pyromellitic acid and an aromatic diamine, polybenzthiazole, polybenzbisthiazole, polybenzoxazole, polybenzbisoxazole, poly(pyromellitimide), poly(m-phenyleneisophthalamide), poly(m-phenylenebenzoimidazole), poly(m-phenylenebenzobisimidazole), polythiazole and poly(m-phenylenevinylene. The graphite film has a discontinuous layer of a polymeric material formed on and in the film whereby not only good electroacoustic characteristics, but also good mechanical strength and good adhesion of an adhesive applied thereof are obtained. A method for fabricating such diaphragm is also described.Type: GrantFiled: November 2, 1990Date of Patent: August 27, 1991Assignees: Matsushita Electric Industrial Co., Ltd., Research Development Corporation of JapanInventors: Mutsuaki Murakami, Susumu Yoshimura
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Patent number: 5024979Abstract: A method is provided for forming a composite ceramic material, in which a fibrous structure is first of all formed which is then embedded in the material of a ceramic matrix. To introduce said matrix into said structure, the following succession of operations is carried out:(a) said fibrous support is impregnated with a polymerization catalyst for an organometallic precursor of said ceramic matrix;(b) said fibrous support impregnated with said polymerization catalyst is placed in contact with said organometallic precursor;(c) said organometallic precursor is polymerized, and(d) said organometallic precursor is pyrolysed so as to obtain said matrix.Type: GrantFiled: March 22, 1989Date of Patent: June 18, 1991Assignee: Aerospatiale Societe Nationale IndustrielleInventors: Caroline Debaig-Valade, Claude Filliatre, Christian Servens
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Patent number: 5002799Abstract: In manufacturing anti-static cathode ray tubes, the concentration of a conducting filler dispersed in the coating solution is so set that a surface resistance lies within a fixed range. The baking step of the anti-static treatment is integrated in the conventional heat treatment of cathode ray tubes. Further, the salvage cap used to receive splashes of coating solution is rotated in synchronization with the tube.Type: GrantFiled: September 12, 1989Date of Patent: March 26, 1991Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yasuo Iwasaki
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Patent number: 4994416Abstract: Silicon carbide whisker-reinforced ceramic composites are fabricated in a highly reproducible manner by beneficating the surfaces of the silicon carbide whiskers prior to their usage in the ceramic composites. The silicon carbide whiskers which contain considerable concentrations of surface oxides and other impurities which interact with the ceramic composite material to form a chemical bond are significantly reduced so that only a relatively weak chemical bond is formed between the whisker and the ceramic material. Thus, when the whiskers interact with a crack propagating into the composite the crack is diverted or deflected along the whisker-matrix interface due to the weak chemical bonding so as to deter the crack propagation through the composite. The depletion of the oxygen-containing compounds and other impurities on the whisker surfaces and near surface region is effected by heat treating the whiskers in a suitable oxygen sparaging atmosphere at elevated temperatures.Type: GrantFiled: December 1, 1989Date of Patent: February 19, 1991Assignee: Martin Marietta Energy Systems, Inc.Inventors: Terry N. Tiegs, Terrence B. Lindemer
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Patent number: 4990366Abstract: A method for the metallizing of a luminescent screen comprises the following steps:the depositing of at least one luminophor coat, comprising at least one binder, on the inner face of the screen;the depositing of a sub-layer, consisting of at least one aqueous emulsion of a water-insoluble film-forming resin;the drying of the sub-layer and the heating of this screen to a temperature greater than the minimum temperature for the formation of the film;the depositing of a finishing layer;the drying of the finishing layer;the depositing of a metallic coating on the finishing layer, and,the volatilizing of the binders of the luminiphor screen, the sub-layer and the finishing layer, wherein the sub-layer and the finishing layer are made from the same aqueous emulsions of water-insoluble film-forming resins, said emulsions having a film-forming temperature of below 45.degree. C. and giving a continuous, thin, resistant, reflective and hydrophobic film.Type: GrantFiled: October 17, 1988Date of Patent: February 5, 1991Assignee: VideocolorInventors: Antimo Pezzulo, Himanshu Patel
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Patent number: 4983573Abstract: There is disclosed an improved process for preparing a superconducting composition having the formula MBa.sub.2 Cu.sub.3 O.sub.x wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tn, Yb and Lu; x is from about 6.5 to about 7.0; said composition having a superconducting transition temperature of about 90.degree. K.; said process consisting essentially of preparing a precursor solution, drying the solution to obtain a solid material, and heating and cooling the solid material under specified conditions to obtain the desired product. In another embodiment, a shaped superconducting MBa.sub.2 Cu.sub.3 O.sub.x article is prepared by impregnating an article of cellulose material with the precursor solution, drying the impregnated article, and heating and cooling the impregnated article under prescribed conditions to obtain the desired product.Type: GrantFiled: March 13, 1989Date of Patent: January 8, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventors: John D. Bolt, Munirpallam A. Subramanian
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Patent number: 4982068Abstract: A heating element comprises a body provided by fibrous tubes of an electrically conductive material, a voidage between the tubes providing a path for a fluid to be heated. The material may be silicon, silicon carbide, or silicon rich-silicon nitride. The heating element is manufactured by coating a fibrous carbon precursor with the material, and heating the coated precursor in an oxidizing environment so as to remove the carbon precursor by oxidation. The heating element has one application for a heat transfer system for controlling the temperature of a hot working device. The system comprises a fluid circuit including the hot working device, the heating element through which the fluid is driven by a pump, and a temperature controller for sensing the temperature of the device and controlling the temperature of the heating element as a function of the device temperature.Type: GrantFiled: November 28, 1989Date of Patent: January 1, 1991Assignee: United Kingdom Atomic Energy AuthorityInventors: James F. Pollock, John M. North, Roy F. Preston, Vincent K. Hewinson
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Patent number: 4971624Abstract: Erosion and abrasion resistant refractory metal carbide articles are provided having multiphase alloy of borides including titanium boride, binder metal boride, and titanium-binder metal-refractory metal borides by diffusion of titanium initially to convert the refractory metal carbide to its constitutents which are then reacted with boron, forming a new added surface in replacement of the original article surface, and bridging the original surface locus.Type: GrantFiled: December 22, 1988Date of Patent: November 20, 1990Inventors: Eugene V. Clark, George K. Sievers
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Patent number: 4946713Abstract: Novel poly(alkenylpentaboranes) such as poly-2-vinylpentaborane are useful as precursors to BN or B.sub.4 C ceramics. The non-crosslinked poly(alkenylpentaboranes), which are soluble in common inert organic solvents, are prepared heat treatment of corresponding alkenylpentaboranes. The non-crosslinked poly(alkenylpentaboranes) are heated under an inert atmosphere to crosslink them, and the crosslinked products are pyrolyzed to yield B.sub.4 C. Alternatively, the non-crosslinked poly(alkenylpentaboranes) are heated in the presence of ammonia to yield a nitrogen-containing polymer which, upon pyrolysis, yields BN.Type: GrantFiled: February 9, 1988Date of Patent: August 7, 1990Assignee: University of PennsylvaniaInventors: Larry G. Sneddon, Mario G. L. Mirabelli
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Patent number: 4931316Abstract: Titanium-containing preceramic fibers are provided with a high loading of titanium by impregnating a polymeric fiber with a liquid comprising a titanium alkoxide where the alkoxide contains at least 2 carbon atoms and precipitating the titanium alkoxide in the fiber as titanium dioxide. Useful titanium alkoxides include titanium tetraethoxide, titanium tetrabutoxide and titanium isopropoxide.Type: GrantFiled: September 6, 1988Date of Patent: June 5, 1990Assignee: Hoechst Celanese Corp.Inventor: Robert E. Johnson