Sintered body of silicon nitride and a process for making the sa

Details Sintered body of silicon nitride and a process for making the sa Sintered body of silicon nitride and a process for making the sa

1990-08-17

1992-01-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 428698, 428702, 264 60, C04B 3558

Patent

active

050810790

ABSTRACT:
A sintered body composed of .alpha.'-silicon nitride and .beta.'-silicon nitride, and having a surface portion which contains a greater proportion of .alpha.'-silicon nitride than its inner portion does. It has high strength and excellent wear resistance. It is produced by preparing a molded body from a sintering material, disposing about the molded body a sintering material which can form a sintered product containing a greater proportion of .alpha.'-silicon nitride than the sintered product of the molded body will, and sintering the molded body and the material disposed about it.

REFERENCES:
patent: 4312899 (1982-01-01), Lahmann
patent: 4622186 (1986-11-01), Mizutani
patent: 4880755 (1989-11-01), Mehrotra et al.
patent: 4943543 (1990-07-01), Ingelstrom

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