Abstract: A refractory boat formed from an intermetallic composite comprising titanium diboride and boron nitride or titanium diboride, boron nitride and aluminum nitride and further including a metal selected from molybdenum, tungsten, tantalum and niobium and an oxide of CaO or Y.sub.2 O.sub.3 with the minimum concentration of oxide of from 0.7 wt % and with a maximum combined concentration of metal and oxide not exceeding 20 wt %. The invention is also directed to a method for forming a hot pressed refractory boat of an intermetallic composite composition as indicated above which is hot pressed at about 1900.degree. C.

Abstract: The method of the present invention comprises preparing a liquid slurry composed of a refractory material in powder form and a deflocculent composed of a vinyl chloride and vinyl acetate resin dissolved in an organic solvent and cold pressing and pressureless sintering to form a shaped refractory article.

Abstract: A ceramic composition and method for making ceramic composites having superior erosion and corrosion resistance to molten metal. The composite includes mullite, aluminum nitride and boron nitride in combination. The composite may be hot pressed or cold formed and pressureless sintered into a desired shape.

Abstract: A ceramic composition and method for making ceramic composites having superior erosion and corrosion resistance to molten metal. The composite includes mullite, aluminum nitride and boron nitride in combination. The composite may be hot pressed or cold formed and pressureless sintered into a desired shape.

Abstract: The composition of the present invention is composed of finely divided solid refractory material suspended in a nonaqueous liquid slip composition. The nonaqueous liquid slip composition consists essentially of a deflocculent composed of a vinyl chloride and vinyl acetate resin dissolved in an organic solvent. The composition may be slip cast or cold formed into a low density article which is then sintered into a dense product.

Abstract: A process for the simultaneous production of titanium diboride and boron nitride powders using a single reaction procedure in which the raw materials of the TiB.sub.2 reaction and the BN reaction are blended together and subjected to a synthesis process which yields synthesized TiB.sub.2 and BN powders.

Abstract: A powder comprising an alloy of a refractory material and carbothermic reaction product produced by carbothermically reacting a blend of at least two metal oxides.

Abstract: A method for forming a dense metal boride composite article having a predetermined shape in which the method comprises blending a metal boride and a nitride to form a mixture of particles, milling the particles to a desired size, coating the particles with a lubricant formed from a polyvinyl acetate, cold forming the particles into an article of desired shape and pressureless sintering the cold formed article.

Abstract: Carbonaceous powders are blended with a high coking value pitch, e.g. mesophase pitch, formed into shaped bodies and then simultaneously compressed and baked in an envelope of finely divided, non-reactive particles, followed by graphitizing, if required, to produce high strength, high density carbon or graphite articles.

Abstract: High density composites consisting of graphite and metal borides by pressing blended powders of pitch-free coke and boride powder. The pressing may be hot pressing at temperatures of about 2200.degree. C. and pressure of about 1500 psi or cold pressing at about room temperature followed by high temperature sintering. Some of the boron from the boride diffuses substitutionally into the structure at the processing temperatures promoting graphitization; whereby densification and bonding the resulting degree of graphitization of the shapes is comparable to that of conventional graphite articles processed at temperatures in excess of 2800.degree. C. The mechanical strength of these composites is equivalent to and often exceeds the strength of conventional graphites and the oxidation resistance in dry air is much superior at temperatures as high as 800.degree. C. Overall processing time is reduced from months to days thus improving the economics of the process.

Abstract: A process for improving the high temperature flexural strength of titanium diboride-boron nitride (TiB.sub.2 -BN) intermetallic compositions which comprises reheating hot pressed TiB.sub.2 -BN stock to about 2000.degree. C. for about four hours in an inert atmosphere.

Abstract: The density of hot pressed sintered refractory composites of AlN, TiB.sub.2 and BN powder mixtures is improved by the addition of small amounts of nickel powder.

Abstract: A method of producing improved fused alumina or fused alumina-chromia refractory bodies wherein the binder added to the fused grain powder prior to forming a slurry for molding contains chromium metal and unfused alumina.