And Chromium Compound Patents (Class 501/117)
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Patent number: 9580768Abstract: The invention relates to a synthetic slag forming briquette encased in an aluminum shell. The briquette may include a deoxidizing agent, calcium oxide, calcium fluoride, calcium aluminate, magnesia, or dolomitic lime, or combinations thereof. The deoxidizing agent may include calcium carbide, powdered aluminum or magnesium, or combinations thereof. The aluminum shell may be formed from molten aluminum, or aluminum sheet or foil.Type: GrantFiled: April 17, 2014Date of Patent: February 28, 2017Assignee: METCAN INDUSTRIAL CORP.Inventor: Dean McCann
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Patent number: 9174874Abstract: A refractory object can include at least 10 wt % Al2O3. Further, the refractory object may contain less than approximately 6 wt % SiO2 or may include a dopant that includes an oxide of Ti, Mg, Ta, Nb, or any combination thereof. In an embodiment, at least approximately 1% of the Al2O3 in the refractory object can be provided as reactive Al2O3. In another embodiment, the refractory object may have a density of at least approximately 3.55 g/cc, a corrosion rate of no greater than approximately 2.69 mm/year, or any combination of the foregoing. In a particular embodiment, the refractory object can be used to form an Al—Si—Mg glass sheet. In an embodiment, the refractory object may be formed by a process using a compound of Ti, Mg, Ta, Nb, or any combination thereof.Type: GrantFiled: March 30, 2012Date of Patent: November 3, 2015Assignee: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: Olivier Citti, Andrea Kazmierczak
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Publication number: 20140349833Abstract: The invention relates to a blend for the production of a sintered refractory material containing chromium oxide, a sintered refractory material containing chromium oxide, a method for the manufacture of a sintered refractory material containing chromium oxide and to a use of magnesium titanate.Type: ApplicationFiled: April 24, 2013Publication date: November 27, 2014Inventors: Boro Djuricic, Roland Nilica, Klaus Santowski
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Publication number: 20140171288Abstract: A cordierite sintered body and a member for semiconductor manufacturing apparatus are disclosed. The cordierite sintered body includes a crystal phase and an amorphous phase. The crystal phase includes a main crystal phase that essentially consists of cordierite crystal grains; and a sub crystal phase that includes sub crystal grains containing alumina, mullite or sapphirine. The amorphous phase contains calcium and is located at grain boundaries of the cordierite crystal grains and the sub crystal grains. A crystal phase proportion of the main crystal phase to the crystal phase (or total of the main crystal phase and the sub crystal phase) is 95% to 97.5% by mass or less. A crystal phase proportion of the sub crystal phase to the crystal phase is 2.5% to 5% by mass or less. The sintered body contains calcium by 0.4% to 0.6% by mass or less in terms of CaO.Type: ApplicationFiled: February 22, 2012Publication date: June 19, 2014Applicant: KYOCERA CORPORATIONInventors: Kouki Okayama, Shuichi Iida, Shuichi Iida, Kouki Okayama, Toshiaki Shigecka
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Publication number: 20120096822Abstract: Fused particles containing, by weight percent: more than 15% but less than 55% of Al2O3; more than 20% but less than 45% of TiO2; more than 3% but less than 30% of SiO2; less than 20%, in total, of at least one oxide selected from the group consisting of ZrO2, Ce2O3, and HfO2; less than 1% of MgO; and more than 1% but less than 15%, in total, of at least one selected from the group consisting of CaO, Na2O, K2O, SrO, B2O3, and BaO. Also, a ceramic product or material obtained by sintering the fused particles.Type: ApplicationFiled: June 25, 2010Publication date: April 26, 2012Applicant: SAINT-GOBAIN CENTRE DE RECH. ET D'ETUDES EUROPEENInventor: Stephane Raffy
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Publication number: 20100065977Abstract: In one aspect, the present invention provides a method of providing a filling material for use in connection with an opening in a container used in molten metal processing including: recovering used refractory bricks; crushing the used refractory bricks into particles; and covering the opening with the particles.Type: ApplicationFiled: September 12, 2008Publication date: March 18, 2010Inventor: Joseph R. Quigley
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Publication number: 20100040778Abstract: A treated refractory material includes a porous refractory material having one or more protective materials disposed within pores of the refractory material. Methods of preparing the treated refractory material are also provided. The treated refractory material provides protection from the penetration of slag and extends the service life of the refractory material.Type: ApplicationFiled: August 14, 2008Publication date: February 18, 2010Applicant: General Electric CompanyInventors: Roman Shuba, Wei Chen, Anthony Mark Thompson
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Publication number: 20100004114Abstract: The invention relates to a fired refractory ceramic product. According to the invention, this generic term encompasses both shaped and unshaped products. Shaped products are ones which have a defined shape so that they can be manufactured in finished form on the premises of the manufacturer. Shaped products include: bricks, nozzles, tubes, stoppers, plates, etc. The term unshaped products includes ones which are usually produced by the user from a corresponding composition. They include bases for furnaces which are cast from a composition but also repair compositions, etc.Type: ApplicationFiled: August 8, 2007Publication date: January 7, 2010Applicant: Refractory Intellectual Property GmbH & Co. KGInventors: Boro Djuricic, Franz Reiterer
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Publication number: 20090142590Abstract: A method includes contacting a transition metal oxide, a sintering additive, and a grain growth inhibitor additive to form a mixture. The transition metal oxide include particles that have an average diameter less than about 1 micrometer and sintering the mixture to a temperature profile that is sufficiently high that a sintered mass is formed from the mixture. The sintering includes at least one of a microwave sintering or a spark plasma sintering. The thermal profile is less than about 1050 degrees Celsius.Type: ApplicationFiled: December 22, 2008Publication date: June 4, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Daniel Qi Tan, Darren Michael Stohr, Wei Zhang
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Patent number: 7510991Abstract: The present invention is directed to a noise suppressor for electronic signals. The noise suppressor at least includes Aluminum Oxide (Al2O3) that is sintered under high temperature, resulting in ceramic Aluminum Oxide (Al2O3) for effectively absorbing or suppressing noise, and reshaping the waveform or filtering waveform glitch of the electronic signals.Type: GrantFiled: July 17, 2006Date of Patent: March 31, 2009Assignee: Y&L Technology Inc.Inventors: Cheng-Cheng Wu, Chien-Lung Chen, Cheng-Fu Wu
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Publication number: 20080274870Abstract: The invention relates to a refractory ceramic product which comprises: a) ?93% by weight of at least one refractory basic component and b) ?7% by weight of at least one anticorrosive component from the group including: b1) transition metals, b2) compounds of transition metals with each other, b3) non-oxidic compounds of transition metals, b4) oxidic compounds of transition metals, b5) compounds of the transition metals with Ca, Ba, Sr.Type: ApplicationFiled: May 10, 2006Publication date: November 6, 2008Applicant: REFRACTORY INTELLECTUAL PROPERTY GMBH & CO. KGInventor: Robert Treimer
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Patent number: 6987077Abstract: A fired spinel complex oxide is produced by firing a mixture containing a slag by-produced in chromium refining, a reducer, and a silica-containing material, and is essentially composed of: 29 to 40 percent by weight of Fe2O3; 15 to 20 percent by weight of Al2O3; 9 to 14 percent by weight of MgO; 0 to 4 percent by weight of Na2O; 9 to 17 percent by weight of Cr2O3; 14 to 20 percent by weight of SiO2; and 2 percent by weight or less of CaO. The fired spinel complex oxide shows a Cu—K? X-ray diffraction pattern in which the ratio (b/a) of the diffraction peak intensity of the silica-containing material (b) in the vicinity of 2?=26.7° to the {113} plane diffraction peak intensity (a) in the vicinity of 2?=36° is 0.1 or less.Type: GrantFiled: June 10, 2004Date of Patent: January 17, 2006Assignee: Nippon Chemical Industrial Co., Ltd.Inventors: Nobuo Takagi, Masami Tadasa
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Patent number: 6982233Abstract: The invention relates to a fired refractory ceramic molded piece with a spinel matrix based on (Mg)2+ (Al, Cr)23+O4, in which coarser particles based on chromium corundum and/or corundum and coarser particles based on ZrO2 are present.Type: GrantFiled: November 8, 2002Date of Patent: January 3, 2006Assignee: Refractory Intellectual Property GmbH & Co.Inventors: Bernd Buchberger, Markus Horn, Roland Nilica
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Publication number: 20040254058Abstract: A fired spinel complex oxide is produced by firing a mixture containing a slag by-produced in chromium refining, a reducer, and a silica-containing material, and is essentially composed of: 29 to 40 percent by weight of Fe2O3; 15 to 20 percent by weight of Al2O3; 9 to 14 percent by weight of MgO; 0 to 4 percent by weight of Na2O; 9 to 17 percent by weight of Cr2O3; 14 to 20 percent by weight of SiO2; and 2 percent by weight or less of CaO. The fired spinel complex oxide shows a Cu—K&agr; X-ray diffraction pattern in which the ratio (b/a) of the diffraction peak intensity of the silica-containing material (b) in the vicinity of 2&thgr;=26.7° to the {113} plane diffraction peak intensity (a) in the vicinity of 2&thgr;=36° is 0.1 or less.Type: ApplicationFiled: June 10, 2004Publication date: December 16, 2004Applicant: NIPPON CHEMICAL INDUSTRIAL CO., LTD.Inventors: Nobuo Takagi, Masami Tadasa
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Publication number: 20040142812Abstract: The invention relates to a fired refractory ceramic molded piece with a spinel matrix based on (Mg)2+ (Al, Cr)23+O4, in which coarser particles based on chromium corundum and/or corundum and coarser particles based on ZrO2 are present.Type: ApplicationFiled: November 12, 2003Publication date: July 22, 2004Inventors: Bernd Buchberger, Markus Horn, Roland Nilica
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Patent number: 6696388Abstract: A gel composition substantially contained within the pores of a solid material for use as a catalyst or as a catalyst support in dehydrogenation and dehydrocyclization processes.Type: GrantFiled: January 10, 2001Date of Patent: February 24, 2004Assignee: E. I. du Pont de Nemours and CompanyInventors: Kostantinos Kourtakis, Leo E. Manzer
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Patent number: 6548435Abstract: The invention relates to free-flowing refractory castable material and castings produced therefrom. Refractory nonbasic and basic refractory castable materials have been known for a long time. The traditional refractory castable materials have thixotropic properties and must be lined sing vibration technology. In the past, free-flowing refractory castable materials were solely based on alumina raw materials. Attempts to produce an aqueous, highly concentrated basic suspension which would Coma the basis of free-flowing refractory castable materials failed to meet the requirements in terms of theological properties and a low degree of to hydration of the MgO-based materials. It is the aim of the invention to provide the above-mentioned refractory castable material for the monolithic lining or repair of high-temperature equipment and for the production of refractory castings. This is achieved by providing a fine-grained and a mixed fine and coarse-grained alternative.Type: GrantFiled: August 30, 2000Date of Patent: April 15, 2003Inventor: Jerzy Bugajski
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Patent number: 6475950Abstract: A chromium catalyst is disclosed for use in dehydrogenation and dehydrocyclization processes.Type: GrantFiled: March 15, 2001Date of Patent: November 5, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Kostantinos Kourtakis, Leo E. Manzer
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Patent number: 6227127Abstract: A sintered material includes a polycrystalline substance of MgAl2O4 and/or Al2O3; and 3 to 90 weight percent of Cr2O3 and/or CeO2. Furnace material, furnace wall block, high temperature protection tube, and high temperature protecting member are made of such sintered material, and have higher heat resistance and corrosion resistance.Type: GrantFiled: April 27, 1999Date of Patent: May 8, 2001Assignee: Kyocera CorporationInventors: Shinichi Yamaguchi, Yasuhiro Tanaka
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Patent number: 6093366Abstract: The present invention provides a ceramic sintered body excellent in oxidation resistance under high temperatures and markedly superior to the conventional ceramic sintered body in the mechanical strength over a wide temperature range of between room temperature and 1,500.degree. C. The ceramic sintered body of the present invention comprises at least one ceramic crystal grain selected from the group consisting essentially of a monosilicate represented by the general formula RE.sub.2 SiO.sub.5, where RE denotes a IIIa group element including yttrium, and a disilicate represented by the general formula RE.sub.2 Si.sub.2 O.sub.7, where RE denotes a IIIa group element including yttrium, and at least one additional element selected from the group consisting of Al, Cr, Hf, Nb, Zr, Ti, V, Ta, Ca and Mg which is segregated in the boundaries of the ceramic crystal grains in an amount of 0.1 to 15% by weight of the sintered body in terms of the oxide thereof.Type: GrantFiled: November 5, 1998Date of Patent: July 25, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Kato, Yasuhiro Goto, Takayuki Fukasawa, Toshiaki Mizutani
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Patent number: 5656203Abstract: A conductive ceramic composition is disclosed which consists essentially of alumina, chromia, and magnesia, and is suitable for use as target electrodes in electrostatic fiber charging applications. Ceramics are disclosed which have exhibit volume resistivities of 10.sup.12 ohm-cm or less at 20.degree. C., and have excellent electrical stability and superior mechanical properties; and an electrostatic charging apparatus is disclosed which employs a ceramic electronic conductor having a volume resistivity of from about 1.times.10.sup.7 to 5.times.10.sup.10 ohm-cm and a hardness of at least 5 GPa.Type: GrantFiled: July 29, 1994Date of Patent: August 12, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventor: Kurt Richard Mikeska
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Patent number: 5629251Abstract: A ceramic coating-forming agent of an Mg-M.sup.3+ -O based two-component oxide solid solution capable of forming a ceramic coating excellent in heat resistance, adhesion to a substrate metal, electric insulation and the properties of low thermal expansion, at a low temperature, the agent containing an Mg-M.sup.3+ -O based two-component oxide solid solution of the formula (1),(Mg.sub.1-x M.sup.2+.sub.x).sub.1-y M.sup.3+.sub.y O (1)wherein M.sup.2+ is at least one divalent metal selected from the group consisting of Ca.sup.2+, Mn.sup.2+, Fe.sup.2+, Co.sup.2+, Ni.sup.2+, Cu.sup.2+ and Zn.sup.2+, M.sup.3+ is at least one trivalent metal selected from the group consisting of Al.sup.3+, Mn.sup.3+, Fe.sup.3+, Co.sup.3+, Ni.sup.3+, Ti.sup.3+, Bi.sup.3+ and Cr.sup.3+, x is a number in the range of 0.ltoreq.x<0.5 and y is a number in the range of 0<y<0.5, or an anionic oxide-dispersed Mg-M.sup.3+ -O based two-component oxide solid solution of the formula (2),(Mg.sub.1-x M.sup.2+.sub.x).sub.1-y M.sup.3+.sub.Type: GrantFiled: May 23, 1995Date of Patent: May 13, 1997Assignee: Kabushiki Kaisha Kaisui Kagaku KankyujoInventor: Shigeo Miyata
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Patent number: 5609961Abstract: The single-layer high temperature coating according to the invention, which is applied in particular on a porous substrate, comprises a high silica glaze gel frit, alumina and an emissivity agent consisting of MoSi.sub.2 or Cr.sub.2 O.sub.3, and has the following composition by weight:gel frit: 45 to 55%;MoSi.sub.2 or Cr.sub.2 O.sub.3 : 25 to 50%;Al.sub.2 O.sub.3 : 5 to 20%.Type: GrantFiled: March 5, 1996Date of Patent: March 11, 1997Assignees: Aerospatiale Societe Nationale Industrielle VIAM-, All Russian Institut of Aviation MaterialsInventors: Galina A. Solovjeva, Vladimir M. Tjurin, Stanislav S. Solntsev
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Patent number: 5601853Abstract: A conductive ceramic composition is disclosed which consists essentially of alumina, chromia, and magnesia, and is suitable for use as target electrodes in electrostatic fiber charging applications. Ceramics are disclosed which have exhibit volume resistivities of 10.sup.12 ohm-cm or less at 20.degree. C., and have excellent electrical stability and superior mechanical properties; and an electrostatic charging apparatus is disclosed which employs a ceramic electronic conductor having a volume resistivity of from about 1.times.10.sup.7 to 5.times.10.sup.10 ohm-cm and a hardness of at least 5 GPa.Type: GrantFiled: March 7, 1995Date of Patent: February 11, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventors: Thomas K. Bednarz, Kurt R. Mikeska
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Patent number: 5595948Abstract: A refractory is disclosed which contains integrally sintered magnesia particles forming the skeleton of the refractory and a mineral phase of magnesium orthotitanate (Mg.sub.2 TiO.sub.4) formed between the magnesia particles, thus giving an increased erosion resistance. Preferably, the refractory comprises coarse magnesia particles having an average particle diameter of at least 1 mm or a mixture of coarse magnesia particles having an average particle diameter of at least 1 mm and medium magnesia particles having an average particle diameter of 1 to 0.15 mm and 5 to 50 wt. % of magnesium orthotitanate intervening between the magnesia particles. The refractory not only has an excellent durability in a basic atmosphere, but also has a high strength because of combination of the coarse or medium magnesia particles so that it does not tend to deform and has a high durability against thermal shock.Type: GrantFiled: June 16, 1995Date of Patent: January 21, 1997Assignee: Mitsubishi Materials CorporationInventors: Etsuji Kimura, Kenichi Yamaguchi, Fumihiko Ogino, Susumu Okabe
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Patent number: 5573987Abstract: The present invention pertains to a refractory ceramic mass, consisting of a pure magnesia component A and a component B, which consists of granules of pure magnesia, wherein the magnesia granules of component B have a ceating consisting of a refractory material whose granule size is fine compared with that of the magnesia granules and is chemically extensively inert with respect to the magnesia granule or reacts with the magnesia granule and/or itself consists of a plurality of components that are chemically reactive with one another.Type: GrantFiled: February 7, 1995Date of Patent: November 12, 1996Assignee: Veitsch-Radex Aktiengesellschaft fur feuerfeste ErzeugnisseInventors: Harald Harmuth, Roland Heindl, Josef Deutsch
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Patent number: 5559063Abstract: A refractory powder includes a filler, a binder, and a metal powder. This provides improved heat transfer in the refractory material during heating, and reduces the problem of explosive cracking and spalling so the refractory material can be burned out at substantially constant temperature, thereby saving considerable amounts of time and energy.Type: GrantFiled: July 12, 1995Date of Patent: September 24, 1996Assignee: Whip Mix CorporationInventor: Atul C. Sarma
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Patent number: 5401698Abstract: In ceramic welding processes, oxidizing gas and a mixture of refractory and fuel powders are projected against a surface and the fuel is burnt to generate sufficient heat that the refractory powder becomes at least partially melted or softened and a cohesive refractory weld mass is progressively built up against that surface. In order to reduce any tendency for the weld mass to include a low-grade refractory phase and thus promote the refractoriness of that weld mass, the fuel powder is present in a proportion of not more than 15% by weight of the total mixture and includes at least two metals selected from aluminum, magnesium, chromium and zirconium, in that at least the major part by weight of the refractory powder consists of one or more of magnesia, alumina and chromic oxide, and in that the molar proportions of silica and calcium oxide present in the refractory powder (if any) satisfy the following expression:molar concentration of SiO.sub.2 in %.ltoreq.0.2+molar concentration of CaO in %.Type: GrantFiled: June 8, 1993Date of Patent: March 28, 1995Assignees: Glaverbel, Fosbel International Ltd.Inventors: Leon P. Mottet, Charles M. Zvosec, Stephen D. Cherico, Alexandre Zivkovic, Guy van Marcke de Lummen, Jean Moreau, Pierre Robyn
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Patent number: 5322827Abstract: A burned chrome-containing refractory and method which provides a refractory having less than 5 ppm total soluble chromium. Such product is obtained by adding to the starting mix less than 10 wt. % (often less than 3 wt. %) zirconia, silica, zircon, or molybdic oxide either individually or in combination.Type: GrantFiled: January 22, 1993Date of Patent: June 21, 1994Assignee: Indresco, Inc.Inventors: David J. Michael, Albert L. Renkey, Kenneth A. McGowan
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Patent number: 5302564Abstract: Abrasive material with particularly high abrasive performance is obtained in that the ceramic material contains an additive of 0.01 to 15 percent by weight, preferably 0.1 to 3 percent by weight of a chromium compound.Type: GrantFiled: February 20, 1992Date of Patent: April 12, 1994Assignee: Treibacher Chemische Werke AktiengesellschaftInventors: Herwig Winkler, Peter Janz, Georg Gottschamel
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Patent number: 5298469Abstract: A lanthanum chromite ceramic powder consisting essentially of 1 mol of LaCr.sub.1-x M.sub.x O.sub.3, where M is a divalent metal selected from the group of zinc, copper and mixtures thereof and x ranges from about 0.02 to 0.2, y mols of B.sub.2 O.sub.3, where y ranges from 0.0005 to 0.04, and z mols of La.sub.2 O.sub.3, where the ratio z/y ranges from 1 to 3, the powder is sintered to high density by firing a compact thereof at a temperature of about 1400.degree. C. in air or other atmosphere, and is particularly suited for use as interconnect material for solid oxide fuel cells.Type: GrantFiled: November 25, 1992Date of Patent: March 29, 1994Assignee: AlliedSignal Inc.Inventors: Stephen Haig, Beili L. Wu, Jean Yamanis
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Patent number: 5286686Abstract: A sinter-reactive lanthanum chromite powder is prepared from the lanthanum chromite precursor LaCr.sub.1-x M.sub.x O.sub.3 (Adsorbate). The powder is crystalline, has the formula LaCr.sub.1-x M.sub.x O.sub.3, where M is selected from the group consisting of zinc, copper and mixtures thereof and x ranges from about 0.02 to 0.2, and sinters to densities higher than about 95% of theoretical density at temperature as low as 1400.degree. C. in oxidizing atmospheres. Sintering to such high density at temperatures in the vicinity of 1400.degree. C. makes the powder particularly suited for use as interconnect material for solid oxide fuel cells.Type: GrantFiled: November 25, 1992Date of Patent: February 15, 1994Assignee: Allied-Signal Inc.Inventors: Stephen Haig, Beili L. Wu, Jean Yamanis
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Patent number: 5219807Abstract: A burned, high-purity refractory, specifically a chrome-alumina, alumina-chrome and picrochromite composition, which contains less than 5 ppm total soluble chromium. Such products are obtained by adding to the starting mix less than 5 wt. % (often less than 3 wt. %) zircon, titania, molybdic oxide, boric acid, carbon black, or silica.Type: GrantFiled: June 27, 1991Date of Patent: June 15, 1993Assignee: Indresco Inc.Inventors: Stanley R. Pavlica, Dwight S. Whittemore
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Patent number: 5206193Abstract: High purity fused grain and refractory compositions that contain a high purity fused grain made up of 35 to 85 wt. % chromia, 5 to 55 wt. % alumina, and 5 to 45 wt. % magnesia. Burned refractory brick having such a chemistry was found to unexpectedly possess superior resistance to AOD and electric furnace slags.Type: GrantFiled: December 19, 1991Date of Patent: April 27, 1993Assignee: Indresco, Inc.Inventors: Albert L. Renkey, Stanley R. Pavlica
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Patent number: 5185301Abstract: A sinter-reactive lanthanum chromite powder is prepared from the lanthanum chromite precursor LaCr.sub.1-x M.sub.x O.sub.3 (Adsorbate). The powder is crystalline, has the formula LaCr.sub.1-x M.sub.x O.sub.3, where M is magnesium or calcium and x ranges from about 0.03 to 0.3, and sinters to densities higher than about 95% of theoretical density at temperature as low as 1600.degree. C. in inert or reducing atmospheres. Sintering to such high density at temperatures in the vicinity of 1600.degree. C. makes the powder particularly suited for use as interconnect material for solid oxide fuel cells.Type: GrantFiled: January 21, 1992Date of Patent: February 9, 1993Assignee: Allied-Signal Inc.Inventors: Beili Li, Stephen Haig, Jean Yamanis
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Patent number: 5169811Abstract: A lanthanum chromite ceramic powder mixture that consists essentially of 1 mol of LaCr.sub.1-x M.sub.x O.sub.3, where M is a divalent metal selected from the group consisting of magnesium, calcium and mixtures thereof and x ranges from 0.03 to 0.3; y mols of B.sub.2 O.sub.3, where y ranges from 0.005 to 0.04; and z mols of La.sub.2 O.sub.3, where the ratio z/y ranges from 1.1 to 3. The mixture is formed into powder compacts and sintered to near full density at temperatures as low as 1400.degree. C.Type: GrantFiled: January 22, 1991Date of Patent: December 8, 1992Assignee: Allied-Signal Inc.Inventors: Ned E. Cipollini, Beili L. Wu, Stephen Haig, Jean Yamanis
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Patent number: 5096642Abstract: A process for producing a high density ceramic of perovskite represented by the formula:ABO.sub.Type: GrantFiled: December 15, 1987Date of Patent: March 17, 1992Assignee: National Institute for Research In Inorganic MaterialsInventor: Shin-ichi Shirasaki
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Patent number: 5028572Abstract: Fused cast refractory moldings having a random microstructure, which are near in size and configuration to the desired final shape, and process and apparatus used in their manufacture are described. The process includes rapid melting of the refractory material followed by controlled rapid cooling. Laminated composite fused cast refractories may be produced.Type: GrantFiled: November 23, 1988Date of Patent: July 2, 1991Assignee: The Carborundum CompanyInventors: Jonathan J. Kim, Thomas A. Myles
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Patent number: 5010046Abstract: An improved chromia-magnesia refractory product of co-fused chromia-magnesia grains bonded by an in situ formed chromia bond is prepared by substantially avoiding the presence of grains that will pass through a screen with openings of 150 microns. The resultant product exhibits improved resistance to silicieous materials such as are present in coal slags.Type: GrantFiled: March 5, 1990Date of Patent: April 23, 1991Assignee: Norton CompanyInventors: Anthony K. Butkus, Scott D. Martin
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Patent number: 5001092Abstract: A refractory composition is disclosed which consists essentially of sized refractory aggregate including at least 10%, based on the total weight of the composition, MgO containing grain having at least 50% MgO and passing a 5 mesh screen, from about 0.1 to about 1.5%, on the dehydrated basis, of chrome sulfate or sodium sulfate, from about 0.1 to about 1.5% of an organic acid or salt thereof; and up to about 1.1% of a plasticizer.Type: GrantFiled: December 2, 1988Date of Patent: March 19, 1991Assignee: Quigley Company Inc.Inventors: Lawrence J. Lake, Charles R. Rumpeltin, William R. Herberger
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Patent number: 4946806Abstract: Oxidizable metallic particles having a grain size of 60 microns or less of the combination of zinc and magnesium used as heat sources in the flame spraying of refractory masses wherein the zinc magnesium form 5% or less by weight of the total mixture of oxidizable particles and refractory particles, and are used with oxidizable metallic silicon in an amount between 8 and 20% by weight, wherein one or more of silica, alumina, magnesite, chromia and/or zirconia, or silicon carbide form the incombustible refractory particles.Type: GrantFiled: November 16, 1988Date of Patent: August 7, 1990Assignee: Sudamet, Ltd.Inventor: David C. Willard
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Patent number: 4902654Abstract: Mixed lanthanide-magnesium aluminates and lasers using monocrystals of these aluminates.These lasers in particular incorporate two flash lamps for longitudinally pumping a monocrystalline rod of a magnetoplumbite-aluminate emitting visible or infrared light, amplified between a mirror, a polarizing prism being used for passing to the outside of the laser the amplified light beam. The aluminate is of formula:(La.sub.1-x Tr.sub.x).sub.1-y-v Mg.sub.1-z-t Al.sub.11-u+y+2z/3 Cr.sub.u O.sub.19-t-3v/3.in which Tr represents a) at least one single trivalent substance chosen from among lanthanides, Y.sup.3+, Sc.sup.3+, or b) at least one pair of lanthanides formed from a divalent element and a trivalent element, while retaining the electrical neutrality by adding aluminium or oxygen deficiencies, or any combination of (a) and (b); x is a number such that 0.ltoreq.x<1; y and v are numbers such that 0.ltoreq.y+v.ltoreq.0.4; z and t are numbers such that 0.ltoreq.z+t<1, provided that when z=t=0, y+v is .noteq.Type: GrantFiled: June 16, 1987Date of Patent: February 20, 1990Assignees: Commissariat a l'Energie Atomique, Centre National de la Recherche Scientifique (CNRS)Inventors: Jean-Jacques Aubert, Anne-Marie Lejus, Bruno Viana, Daniel Vivien
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Patent number: 4780434Abstract: A refractory composition which is suitable for forming a sliding gate to be used at the bottom of a ladle or tundish is provided. The refractory composition comprises 10 to 30 parts by weight of an alumina-magnesia spinel material containing 40 to 70% by weight of Al.sub.2 O.sub.3, 25 to 60% by weight of MgO and 10% or less of impurities, and 70 to 90 parts by weight of a magnesia material containing at least 90% by weight of MgO, wherein the composition contains 10 to 25% by weight of Al.sub.2 O.sub.3 and 75 to 90% by weight of MgO. 1 to 10 parts by weight of Al.sub.2 O.sub.3 material may be further added together with the alumina-magnesia spinel material and the magnesia material, to form the refractory composition.Type: GrantFiled: December 22, 1986Date of Patent: October 25, 1988Assignee: Toshiba Ceramics, Co., Ltd.Inventors: Takashi Watanabe, Takumi Nishio, Yoshihisa Kato, Kazuhide Kawai, Satoshi Doro, Takafumi Nishibe, Takahiro Fukaya
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Patent number: 4775648Abstract: Heavy ceramic shaped material with a content of at least one of the components magnesia, fired dolomite, chromite and spinel, characterized by a microcrack system substantially homogeneously distributed in the shaped material structure, as well as process for producing such a heavy ceramic shaped material and the use thereof.Type: GrantFiled: August 1, 1986Date of Patent: October 4, 1988Inventors: Peter Bartha, Guido Weibel
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Patent number: 4751070Abstract: Ultrafine particles of ceramic or metallic material are obtained at low temperatures from a nitrate source capable of endothermic decomposition by molecularly combining under a nitrogen atmosphere the nitrate source with an inorganic reducing fuel compound, such as hydrazine, to provide a chemical precursor for the ceramic or metallic material and then exothermically decomposing the precursor in a controlled atmosphere by heating to a temperature up to about 200.degree. C. below the endothermic decomposition temperature of the nitrate source. The nitrate source is a metal nitrate or a mixture of nitrate salts. Ferrite particles are recovered when the nitrate source is a mixture of nitrate salts containing ferric nitrate in a 2:1 molar ratio with at least one additional metal nitrate.Type: GrantFiled: April 15, 1986Date of Patent: June 14, 1988Assignee: Martin Marietta CorporationInventor: Vencatesh R. Pai Verneker
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Patent number: 4657878Abstract: A novel method of making a refractory material is disclosed comprising the steps of providing an electrical arc metal furnace, charging that furnace with a charge of refractory oxide, and selecting voltage, amperage and electrode spacings to create novel "hum and scum" melt conditions. This hum and scum condition is maintained until said charge is substantially melted. The described technique is particularly useful for melting magnesia chrome materials to produce fusion cast refractory products which are highly reduced and quite dense. The elaboration of this product requires higher energy input per pound concurrent with an increased consumption of reducing materials compared with standard preparation conditions. The resulting product exhibits higher oxidation weight gains, higher densities, lower porosities, high cold crush strengths, more thermal shock resistance, and better corrosion-erosion resistance than similar magnesia chrome refractory products fused using prior "arc and bark" processes.Type: GrantFiled: February 8, 1985Date of Patent: April 14, 1987Assignee: Corhart RefractoriesInventors: Thomas A. Clishem, Leonard W. Pokallus
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Patent number: 4647547Abstract: A high chromia refractory composite has been developed with improved thermal shock resistance and containing about 5-30 wt. % of unstabilized ZrO.sub.2 having a temperature-dependent phase change resulting in large expansion mismatch between the ZrO.sub.2 and the chromia matrix which causes microcracks to form during cooling in the high chromia matrix. The particle size preferably is primarily between about 0.6-5 microns and particularly below about 3 microns with an average size in the order of 1.2-1.8 microns.Type: GrantFiled: December 10, 1985Date of Patent: March 3, 1987Assignee: The United States of America as represented by the United States Department of EnergyInventors: Jitendra P. Singh, Jawana J. James, John J. Picciolo
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Patent number: 4574119Abstract: A refractory brick made from a size graded batch comprising 20-30 weight percent magnesite containing less than 0.8 weight percent silica, and the balance a chrome ore. The chrome ore includes oxides of chromium, aluminum and iron wherein the ratio between the oxides of chromium and the oxides of aluminum and iron is greater than 2 to 1. The silica content of the chrome ore is less than 2.7 weight percent, the iron oxide content is less than 17 weight percent, and the chrome ore to magnesite ratio is between 2.33 to 4 to 1.Type: GrantFiled: June 11, 1984Date of Patent: March 4, 1986Assignee: Dresser Industries, Inc.Inventors: John D. Perry, David J. Michael
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Patent number: 4545568Abstract: Unfired refractory structural member in the form of a plate for the expendable lining of metallurgical vessels, especially for tundishes used in continuous steel casting, and comprising magnesia sinter and possibly olivine with a grading of 30-45% by weight under 0.09 mm, and 55-70% by weight 0.09 to 4 mm, including 20-40% by weight over 1 mm; cork or granulated ceramic fibers as a pore-forming material; an inorganic binder; and possibly other additives. This refractory structural member has good strength, a small ignition loss, a low content of volatile hydrogen-containing substances, a favorable peeling behavior, and good resistance to slag and molten steel.Type: GrantFiled: February 17, 1984Date of Patent: October 8, 1985Assignee: Didier-Werke AGInventors: Hans Rothfuss, Gunter Wieland, Peter Schreiter
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Patent number: 4522926Abstract: A refractory composition for use in contact with molten aluminum alloys containing a refractory aggregate, a binder and 9Al.sub.2 O.sub.3.2B.sub.2 O.sub.3. The aluminum borate may be of the type produced as a by-product in the production of ferro-boron alloys and known as aluminum boron slag.Type: GrantFiled: March 10, 1983Date of Patent: June 11, 1985Assignee: Combustion Engineering, Inc.Inventor: Frank T. Felice