Sintering process and novel ceramic material

Details Sintering process and novel ceramic material Sintering process and novel ceramic material

1991-10-07

1992-08-18

Bell, Mark L.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 501 92, C04B 3556

Patent

active

051397196

ABSTRACT:
A process for the sintering of a body comprising silicon carbide and a boron-containing material, which comprises heating the body to an effective sintering temperature in the presence of nitrogen; removing the nitrogen by evacuation to a pressure of less than 10.sup.-2 mbar; and continuing the sintering under vacuum or in the presence of an inert gas other than nitrogen. The invention also describes a sintered body comprising silicon carbide and a boron-containing material, having a density of at least 96% of its theoretical maximum density, in which the body contains less than 0.7% w of free carbon, and has a mean silicon carbide grain size of less than 5 microns.

REFERENCES:
patent: 3954483 (1976-05-01), Prochazka
patent: 3968194 (1976-07-01), Prochazka
patent: 4135937 (1979-01-01), Murata et al.
patent: 4487734 (1984-12-01), Sawamura
patent: 4555358 (1985-11-01), Matsushita et al.
patent: 4762810 (1988-08-01), Endo et al.
patent: 4855263 (1989-08-01), Kawasaki et al.

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