Process for producing polycrystalline dense shaped bodies...

Details Process for producing polycrystalline dense shaped bodies... Process for producing polycrystalline dense shaped bodies...

C - Chemistry, Metallurgy

04

B

C04B 35/52 (2006.01) B24C 5/04 (2006.01) B28B 3/00 (2006.01) C04B 35/563 (2006.01) C04B 35/58 (2006.01)

Patent

CA 2126058

PROCESS FOR PRODUCING POLYCRYSTALLINE DENSE SHAPED BODIES BASED ON BORON CARBIDE BY PRESSURELESS SINTERING ABSTRACT OF THE DISCLOSURE A process for producing shaped bodies of boron carbide, metal diboride and carbon, which includes (a) homogeneously mixing pulverulent boron carbide with at least one pulverulent monocarbide of an element Ti, Zr, Hf, V, Nb and Ta in an amount corresponding to from 2% to 6% by weight of free carbon, based on the total weight of the boron carbide; (b) shaping this mixture into green bodies of a density of at least 50% TD; (c) heating the preformed body thus obtained to from about 1250°C to 1450°C with exclusion of oxygen in a sintering furnace and maintaining it within this temperature range for from 10 to 120 minutes; and (d) subsequently sintering the preformed body by heating to from 2100°C to 2250°C.

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