Refractory, electrically conductive, mixed materials...

Details Refractory, electrically conductive, mixed materials... Refractory, electrically conductive, mixed materials...

H - Electricity

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B

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H01B 1/04 (2006.01) C04B 35/58 (2006.01) C04B 35/583 (2006.01) C04B 35/645 (2006.01) C23C 14/24 (2006.01)

Patent

CA 1230217

REFRACTORY, ELECTRICALLY CONDUCTIVE, MIXED MATERIALS CONTAINING BORON NITRIDE AND PROCESS FOR THEIR MANUFACTURE ABSTRACT OF THE DISCLOSURE The invention is refractory, electrically con- ductive, mixed materials based on hexagonal boron nitride and at least one electrically conductive component such as titanium boride and zirconium boride, and having a density of at least about 95% of the theoretical density and non- direction-dependent properties, which have been manufactured from powder mixtures that are practically free of oxygen and metal and comprise from about 10 to 60% by weight of boron nitride, from about 0 to 60% by weight of aluminum nitride and/or silicon nitride, and from about 30 to 70% by weight of an electrically conductive component, without the concomitant use of sintering aids by means of isostatic hot pressing in a vacuum-tight casing at tempera- tures of from about 1400 to 1700°C and under a pressure of from about 100 to 300 MPa. The powder mixtures are pre-den- sified to form green bodies in block form and are then introduced into casings or coated with a material forming a vacuum-tight casing. The pre-densified green bodies in the vacuum-tight casing are then subjected to the isostatic hot-pressing process in a high-pressure autoclave, using an inert gas such as argon, as pressure-transmission medium. The article formed from the mixed materials are used to manufacture evaporation boats for the vacuum evaporation of metals. -1-

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