Sintered silicon carbide and silicon nitride base composite

Details Sintered silicon carbide and silicon nitride base composite Sintered silicon carbide and silicon nitride base composite

1991-01-23

1992-06-16

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 97, 501 98, 264 66, C04B 3556, C04B 3558

Patent

active

051224852

ABSTRACT:
A method for producing a sintered silicon carbide and silicon nitride base composite which is suitable for a material for automotive engine parts. The method is comprised of compacting a mixture including, as major components, powder of .beta.-type silicon carbide and powder of .alpha.-type silicon nitride to form a compact. The compact is first sintered at ordinary pressure, and then resintered at a pressure of nitrogen gas ranging from 10 to 2000 atmosphere and at a temperature higher 100.degree. to 200.degree. C. than that in the ordinary pressure sintering, thereby obtaining the sintered composite high in strength and toughness.

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C. Greskovich et al, "Observations on the fracture Toughness of B--Si.sub.3 N.sub.4 --B--SiC Composites" Journal of American Ceramic Society, vol. 63, No. 9-10, pp. 597-599.

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