Abstract: A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon FJDSR but not including line RF of FIG. 4, a porosity of less than about 10% by volume, and a thermal conductivity greater than 1.00 W/cm.multidot.K at 25.degree. C. which comprises forming a mixture comprised of aluminum nitride powder containing oxygen, yttrium oxide, and free carbon, shaping said mixture into a compact, said mixture and said compact having a composition wherein the equivalent % of yttrium and aluminum ranges from point D up to point F of FIG. 4, said compact having an equivalent % composition of Y, Al, O and N outside the composition defined and encompassed by polygon FJDSR and FIG.

Abstract: A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon P1N1KJ but not including lines KJ and P1J of FIG. 4, and a thermal conductivity greater than 1.00 W/cm.multidot.K at 25.degree. C. which comprises forming a mixture comprised of aluminum nitride powder containing oxygen, yttrium oxide, and free carbon, shaping said mixture into a compact, said mixture and said compact having a composition wherein the equivalent % of yttrium and aluminum ranges between points K and P1 of FIG. 4, said compact having an equivalent % composition of Y, Al, O and N outside the composition defined and encompassed by polygon P1N1KJ of FIG.

Abstract: A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon JKLM but not including line MJ of FIG. 4 and a thermal conductivity greater than 1.00 W/cm.multidot.K at 25.degree. C., preferably greater than 1.42 W/cm.multidot.K at 25.degree. C., which comprises forming a mixture comprised of aluminum nitride powder containing oxygen, yttrium oxide, and free carbon, shaping said mixture into a compact, said mixture and said compact having a composition wherein the equivalent % of yttrium and aluminum ranges from point L to less than joint J of FIG. 4, said compact having an equivalent % composition of Y, Al, O and N outside the composition defined and encompassed by polygon JKLM of FIG.

Abstract: A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon LT1DM but not including lines LM and DM of FIG. 4, a porosity of less than about 10% by volume, and a thermal conductivity higher than 1.00 W/cm.multidot.K at 25.degree. C. which comprises forming a mixture comprised of aluminum nitride powder containing oxygen, yttrium oxide, and free carbon, shaping said mixture into a compact, said mixture and said compact having a composition wherein the equivalent % of Yttrium and aluminum ranges from point T1 up to point M of FIG. 4, said compact having an equivalent % composition of Y, Al, O and N outside the composition defined and encompassed by polygon LT1DM of FIG.

Abstract: A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon P1JFA4 but not including lines JF and A4F of FIG. 4, a porosity of less than about 10% by volume, and a thermal conductivity greater than 1.00 W/cm.multidot.K at 25.degree. C. which comprises forming a mixture comprised of aluminum nitride powder containing oxygen, yttrium oxide, and free carbon, shaping said mixture into a compact, said mixture and said compact having a composition wherein the equivalent % of yttrium and aluminum ranges between points J and A4 of FIG. 4, said compact having an equivalent % composition of Y, Al, O and N outside the composition defined and encompassed by polgon P1JFA4 of FIG.

Abstract: Method for producing a polycrystalline body comprised of from about 50% by weight to about 95% by weight of zircon and from about 5% by weight to about 50% by weight of cordierite, said body having a density greater than 85% of its theoretical density.

Abstract: A thermoplastically moldable ceramic composition comprised of from about 40% to about 60% by volume of a ceramic powder and a binder comprised of an organic acid and a copolymer of ethylene and from greater than about 12 weight % to about 33 weight % vinyl acetate, said organic acid having a melting point ranging from about 44.degree. C. to about 88.degree. C. and ranging from greater than about 18% by weight up to about 45% by weight of the binder. The ceramic composition is thermoplastically molded into a body which is baked to remove the binder and then densified to produce a polycrystalline body having a porosity of less than about 20% by volume.

Abstract: A metal oxide is formed within the pores of a porous sintered blank substantially uniformly throughout the porosity of the blank producing a porous bubble pressure barrier of predetermined pore size. The barrier is integrally sintered to a face of an electrode, the median pore size of the barrier being significantly smaller than that of the electrode, producing a composite useful as an electrode in a molten carbonate fuel cell. The blank and the electrode are composed of metal.

Abstract: A thermoplastically moldable ceramic composition comprised of from about 40% to about 60% by volume of a sinterable silicon carbide powder and a binder comprised of an organic acid and a copolymer of ethylene and from greater than about 12 weight % to about 33 weight % vinyl acetate, said organic acid having a melting point ranging from about 44.degree. C. to about 88.degree. C. and ranging from greater than about 18% by weight up to about 45% by weight of the binder. The ceramic composition is thermoplastically molded into a body which is baked to remove the binder and then sintered.

Abstract: Spherical particles of polycrystalline silicon carbide having a density greater than 80% of the theoretical density for silicon carbide and having an average diameter ranging from about 10 microns to about 5000 microns are produced by forming spherical agglomerates of a sinterable silicon carbide powder and sintering the agglomerates at a temperature ranging from about 1900.degree. C. to about 2300.degree. C.

Abstract: A process for producing a polycrystalline aluminum nitride ceramic body having a composition defined and encompassed by line ABCDEFA but not including lines CD and EF of FIG. 1, a porosity of less than about 10% by volume of said body and a thermal conductivity greater than 1.0 W/cm.multidot.K at 22.degree. C. which comprises forming a mixture comprised of aluminum nitride powder and an yttrium additive selected from the group consisting of yttrium, yttrium hydride, yttrium nitride and mixtures thereof, said aluminum nitride and yttrium additive having a predetermined oxygen content, said mixture having a composition wherein the equivalent % of yttrium, aluminum, nitrogen and oxygen is defined and encompassed by line ABCDEFA but not including lines CD and EF in FIG. 1, shaping said mixture into a compact and sintering said compact at a temperature ranging from about 1850.degree. C. to about 2170.degree. C.

Abstract: A particulate mixture of ceramic powder, free carbon and a hydride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof is hot pressed decomposing the hydride and reacting the resulting metal with carbon producing a polycrystalline microcomposite comprised of a continuous phase of the carbide of the metal which encapsulates at least about 20% by volume of the ceramic particles and which either encapsulates or is intermixed with the balance of said ceramic particles.

Abstract: A particulate mixture of ceramic powder, boron and a hydride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof is hot pressed decomposing the hydride and reacting the resulting metal with boron producing a polycrystalline microcomposite comprised of a continuous phase of the boride of the metal which encapsulates at least about 20% by volume of the ceramic particles and which either encapsulates or is intermixed with the balance of said ceramic particles.

Abstract: A particulate mixture of an alkali metal carbonate solvent, titanium oxide, and an alkaline earth reactant selected from the group consisting of barium oxide, strontium oxide, and mixtures thereof, is heated to melt the alkali metal carbonate solvent in which the reactants dissolve and react precipitating a titanate selected from the group consisting of barium titanate, strontium titanate and mixtures thereof.

Abstract: The process comprises forming a mixture comprised of aluminum nitride powder and free carbon wherein the aluminum nitride has a predetermined oxygen content higher than about 0.8% by weight and wherein the amount of free carbon reacts with such oxygen content to produce a deoxidized powder or compact having an oxygen content ranging from greater than about 0.35% by weight to about 1.1% by weight and which is at least 20% by weight lower than the predetermined oxygen content, heating the mixture or a compact thereof to react the carbon and oxygen producing the deoxidized aluminum nitride, and sintering a compact of the deoxidized aluminum nitride producing a ceramic body having a density greater than 85% of theoretical and a thermal conductivity greater than 0.5 W/cm.multidot.K. at 22.degree. C.

Abstract: A sintered SiC body is produced by forming a thermoplastically moldable ceramic composition comprised of sinterable silicon carbide powder and binder, thermoplastically molding the ceramic composition into a body, embedding the body in nominally spherical particles having a density greater than 80% of the particle's theoretical density and being selected from the group consisting of polycrystalline silicon carbide, free carbon-coated polycrystalline silicon carbide, free carbon and mixtures thereof, baking the embedded body to remove the binder therefrom, recovering and sintering said baked body.

Abstract: Method for producing a polycrystalline body comprised of from about 50% by weight to about 95% by weight of mullite and from about 5% by weight to about 50% by weight of cordierite, said body having a porosity of less than about 10% by volume.

Abstract: Method for producing a polycrystalline body comprised of from about 50% by weight to about 95% by weight of crystalline mullite and from about 5% by weight to about 50% by weight of crystalline beta spodumene, said body having a density greater than 85% of its theoretical density.

Abstract: A ferrous metal body having a diffusion bonded coating which is corrosion resistant and free of any significant polarization, the bulk of said coating being comprised an alloy of at least about 70% by weight molybdenum, up to about 5% by weight iron balance chromium, the outside surface or surface portion of said coating being comprised of an alloy of at least about 30% by weight chromium, up to about 1% by weight iron, balance molybdenum, said outside surface or outside surface portion of said coating being significantly richer in chromium than said bulk portion, and a diffusion bonding layer comprised of MoCrFe alloy extending from said bulk portion into the surface of said ferrous body, said diffusion bonding layer being comprised of at least about 10% by weight molybdenum, at least about 5% by weight chromium and at least about 10% by weight iron.

Abstract: A particulate mixture of ceramic powder, free carbon and a hydride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof is hot pressed decomposing the hydride and reacting the resulting metal with carbon producing a polycrystalline microcomposite comprised of a continuous phase of the carbide of the metal which encapsulates at least about 20% by volume of the ceramic particles and which either encapsulates or is intermixed with the balance of said ceramic particles.