Patents by Inventor Karl A. Schwetz
Karl A. Schwetz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20090017200Abstract: A method for producing a ceramic coating of metallic and/or ceramic surfaces and products in reactors, process plants and combustion plants includes applying a mixture of fine-particle boron nitride, at least one inorganic binding agent of medium particle size in the nanometer range, containing substantially Al2O3, AlO(OH), ZrO2, Y—ZrO2, TiO2, Fe2O3 and/or SnO2 or an associated precursor compound and at least one solvent and/or water onto a metallic and/or ceramic surfaces or product, and burning the applied mixture into a coating through heating.Type: ApplicationFiled: September 23, 2008Publication date: January 15, 2009Inventors: Olaf BINKLE, Stefan Faber, Ralph Nonninger, Romeo Volz, Karl Schwetz, Martin Engler, Helmut Schmidt, Mesut Aslan, Robert Drumm, Hareesh Nair, Klaus Endres, Bernd Reinhard
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Patent number: 7309672Abstract: This disclosure describes sintered bodies comprising about 90 wt % to about 99 wt % of boron carbide, having a B:C atomic ratio ranging from 3.8 to 4.5:1; 0 to 1 wt % free carbon; 0 to 1 wt % BN or AlN, remainder an oxide binder phase; said sintered body having a uniform microstructure composed of substantially equiaxed grains of said boron carbide; the oxide binder phase comprising at least a rare earth aluminate and optionally Al2O3 or other ternary or binary phases of rare earth oxide-alumina systems; the binder phase being present in form of pockets at the multiple grain junctions and the density of no more than 2.6 g/cm3. Also described is a manufacturing process for the above described substantially pore-free, sintered boron carbide materials with high strength and fracture toughness, which can be used for production of large-area parts. This is achieved by liquid phase low temperature-low pressure hot pressing of boron carbide in an argon atmosphere.Type: GrantFiled: July 5, 2005Date of Patent: December 18, 2007Assignee: Ceradyne, Inc.Inventors: Biljana Mikijelj, Georg Victor, Karl A. Schwetz
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Publication number: 20070054057Abstract: The invention relates to corrosion-resistant, temperature-stable, durable mould release layers, suitable for the die casting of non-ferrous metals, comprising boron nitride and slips for production thereof, a method for production of the slips, a method for production of the mould release layers and the use of the mould release layers.Type: ApplicationFiled: June 11, 2004Publication date: March 8, 2007Applicant: ESK CERAMICS GMBH & CO. KGInventors: Peter Matje, Martin Engler, Karl Schwetz, Mesut Aslan, Robert Drumm, Klaus Endres, Hareesh Nair, Bernd Reinhard, Helmut Schmidt
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Publication number: 20070010391Abstract: This disclosure describes sintered bodies comprising about 90 wt % to about 99 wt % of boron carbide, wherein the B:C atomic ratio ranges from 3.8 to 4.5:1; 0 to 1 wt % free carbon; 0 to 1 wt % BN or AlN, remainder an oxide binder phase; said sintered body having a uniform microstructure composed of substantially equiaxed grains of said boron carbide; the oxide binder phase comprising a least a rare earth aluminate and optionally other ternary or binary phases of rare earth oxide—alumina systems; the binder phase being present in form of pockets at the multiple grain junctions and the density of no more than 2.6 g/cm3. Also described is a manufacturing process for the above described substantially pore-free, sintered boron carbide materials with high strength and fracture toughness, which can be used for production of large-area parts. It is achieved by liquid phase low temperature—low pressure hot pressing of boron carbide in an argon atmosphere.Type: ApplicationFiled: July 5, 2005Publication date: January 11, 2007Inventors: Biljana Mikijelj, Georg Victor, Karl Schwetz
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Patent number: 6777076Abstract: Shaped body based on polycrystalline SiC and having a density of greater than 90% of its theoretical density and an adherent graphite layer on its surface, wherein the graphite layer is crystalline, has a thickness of 0.1-100 &mgr;m and has been produced by thermal surface decomposition of the SiC after it has been sintered to closed porosity.Type: GrantFiled: September 6, 2001Date of Patent: August 17, 2004Assignee: Wacker-Chemie GmbHInventors: Hubert Thaler, Karl Schwetz, Armin Kayser
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Publication number: 20020074744Abstract: Shaped body based on polycrystalline SiC and having a density of greater than 90% of its theoretical density and graphite layer on its surface, wherein the graphite layer is crystalline, has a thickness of 0.1-100 &mgr;m and has been produced by thermal surface decomposition of the SiC after it has been sintered to closed porosity.Type: ApplicationFiled: September 6, 2001Publication date: June 20, 2002Applicant: Wacker-Chemie GmbHInventors: Hubert Thaler, Karl Schwetz, Armin Kayser
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Process for producing green compacts by molding sinterable ceramic mixtures based on silicon nitride
Patent number: 4970036Abstract: The invention relates to a process for producing green compacts by the slip-casting process, injection-molding process or extrusion process from sinterable mixtures based on a starting powder mixture containing silicon nitride, and, if appropriate, aluminum nitride and/or alumina and other oxides as sinter aids. The dispersant and binder used is a magnesium chloride hydrate as a mixture with magnesium oxide and water and, after molding, the mixtures are hardened at temperatures from 30.degree. to 60.degree. C. In addition, ceramic fibers, such as silicon carbide, can also be processed as fillers. The green compacts thus produced are sufficiently stable, so that they can be worked mechanically.Type: GrantFiled: July 5, 1989Date of Patent: November 13, 1990Assignee: Elektroschmelzwerk Kempten GmbHInventors: Hubert Thaler, Dietrich Lange, Karl A. Schwetz -
Patent number: 4756482Abstract: The invention is a process for the manufacture of sinterable silicon carbide and/or boron carbide powders having a maximum particle size of 1 .mu.m and finer. The process is carried out by wet grinding in aqueous suspension using mills charged with a grinding medium and with the addition of antioxidants in the presence of surfactants and subsequent wet chemical treatment with an aqueous potassium hydroxide solution. The wet grinding can be carried out, for example, with the addition of hydroquinone in the presence of quaternary ammonium salts and the wet chemical treatment with a 5-50% by weight aqueous potassium hydroxide solution under normal pressure at temperatures in the range of from room temperature to the boiling temperature of the reaction mixture or under elevated pressure at temperatures of up to 300.degree. C.Type: GrantFiled: July 22, 1987Date of Patent: July 12, 1988Assignee: Elektroschmelzwerk Kempten GmbHInventors: Peter Matje, Karl A. Schwetz
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Patent number: 4614724Abstract: The invention relates to polycrystalline sintered compact based on europium hexaboride having a density of at least 85% of the theoretical density. The compacts comprise EuB.sub.6, from about 0.1 to 10% by weight of B.sub.4 C and, optionally, amorphous carbon, and have a total of Eu+B+C of at least 98.5% by weight. They have a homogeneous microstructure with mean grain sizes of less than 20 .mu.m, in which, in addition to the crystalline phase EuB.sub.6-x C.sub.x, in which x has values of from 0 to 0.25, B.sub.4 C can be detected as a separate, finely divided, crystalline phase.The sintered compacts can be manufactured from powder mixtures comprising europium hexaboride of stoichiometric composition and additions of boron carbide and/or mixtures of a carbon-containing material and a boron component by means of hot pressing in graphite moulds, by means of isostatic hot pressing in casings that can be sealed so that they are gas-impermeable, or by means of pressureless sintering.Type: GrantFiled: December 19, 1983Date of Patent: September 30, 1986Assignee: Elektroschmelzwerk Kempten GmbHInventors: Heinrich Knoch, Karl A. Schwetz, Alfred Lipp, Eckhart Bechler
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Patent number: 4564601Abstract: The invention is substantially pore-free shaped articles which consist essentially of polycrystalline .alpha.- or .beta.-silicon carbide in the form of a single-phase homogeneous microstructure having grain sizes not exceeding 8 .mu.m, and which are manufactured from SiC powder, without the concomitant use of sintering aides, by isostatic hot-pressing in a vacuum-tight casing at temperatures of from about 1900.degree. C. to 2300.degree. C. and at pressures of from about 100 to 400 MPa. The SiC starting materials have .alpha.- and/or .beta.-SiC powders having a total content of metallic impurities not exceeding 0.1% by weight and a particle size of 4 .mu.m and finer.Type: GrantFiled: August 29, 1984Date of Patent: January 14, 1986Assignee: Elektroschmelzwerk Kempten GmbHInventors: Jochen Kriegesmann, Klaus Hunold, Alfred Lipp, Klaus Reinmuth, Karl A. Schwetz
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Patent number: 4524138Abstract: The invention provides substantially pore-free sintered polycrystalline articles comprising .alpha.-silicon carbide, boron carbide and free carbon, the quantitative proportions of which, in percent by weight, are defined by the trapezoidal area having, in the ternary system B/Si/C of FIG. 1 the corner pointsa=89.0% B.sub.4 C, 9.9% .alpha.-Sic, 1.1% Cb=9.9% B.sub.4 C, 89.0% .alpha.-SiC, 1.1% Cc=9.0% B.sub.4 C, 81.0% .alpha.-Sic, 10.0% Cd=81.0% B.sub.4 C, 9.0% .alpha.-SiC, 10.0% CThe articles have a density of at least 99% of the theoretical density, an average structural grain size of less than 20 .mu.m and a 4-point flexural strength of at least 400 N/mm.sup.2. They are manufactured from fine-grained mixtures of .alpha.-silicon carbide, boron carbide, carbon and/or material that can be coked to form carbon, in a two-stage sintering process. In the first stage, green bodies preshaped from the powder are subjected to pressureless sintering to a density of at least 95% TD at from 1950.degree. to 2150.degree. C.Type: GrantFiled: May 5, 1983Date of Patent: June 18, 1985Assignee: Elektroschmelzwerk Kempten GmbHInventors: Karl A. Schwetz, Klaus Reinmuth, Klaus Hunold, Franz Isemann
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Patent number: 4230497Abstract: There are provided shaped articles of polycrystalline silicon carbide having densities of at least 97% and improved mechanical properties particularly at high temperatures, said articles consisting ofat least 95.4% by weight of .alpha.-silicon carbide,about 0.1 to 2.0% by weight of additional carbon,about 0.2 to 2.0% by weight of aluminium,about 0 to 0.5% by weight of nitrogen, andabout 0 to 0.1% by weight of oxygen,the .alpha.-silicon carbide being in the form of a homogeneous microstructure with an average grain size of less than 10 .mu.m.There is also provided a process for the preparation of such articles by pressureless sintering submicron powder compacts consisting of .alpha.-silicon carbide and aluminium- and carbon-containing additives as sintering aids.Type: GrantFiled: February 26, 1979Date of Patent: October 28, 1980Assignee: Elektroschmelzwerk Kempten GmbHInventors: Karl A. Schwetz, Alfred Lipp
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Patent number: 4195066Abstract: A method of producing dense shaped articles of pure boron carbide that optionally contain 0.1 to 8% by weight of free carbon in the form of graphite is disclosed involving the steps of homogeneously mixing boron carbide in submicron powder form with small quantities of a carbon containing additive, forming the powder mixture into a shaped green body and then sintering the body in a controlled atmosphere and in the absence of external pressure at a temperature of about 2100.degree.-2200.degree. C. The shaped articles thus obtained are polycrystalline and, insofar as they correspond to the stoichiometric composition B.sub.4 C, single-phase; they have an average grain size of not more than 10 .mu.m, a density of at least 90% of the theoretical density of boron carbide and a flexural strength of at least 300 N/mm.sup.2. The fracture mode of the sintered articles is completely transcrystalline.Type: GrantFiled: November 15, 1978Date of Patent: March 25, 1980Assignee: Elektroschmelzwerk Kempten GmbHInventors: Karl A. Schwetz, Georg Vogt
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Patent number: 4118256Abstract: A process for the production of oxygen free copper castings and moldings, which contain 0.05 to 0.2% by weight of boron as micro-alloy element, by deoxidation of oxygen containing copper melts by means of calcium hexaboride, comprising introducing 0.3-1% by weight of a CaB.sub.6 into the copper melt, the CaB.sub.6 containing at least 3% C calculated on the weight of the CaB.sub.6, subsequently subjecting the cooled melt, if desired while molding the same, to a solution annealing operation and following up with a storage for an extended time.Type: GrantFiled: November 4, 1976Date of Patent: October 3, 1978Assignee: Electroschmelzwerk Kempten GmbHInventors: Karlheinz G. Schmitt-Thomas, Alfred Lipp, Karl Schwetz