High hardness silicon nitride sintered bodies

Details High hardness silicon nitride sintered bodies High hardness silicon nitride sintered bodies

1989-07-12

1991-05-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 3558

Patent

active

050156080

ABSTRACT:
A high hardness silicon nitride sintered body which includes 10.about.50% of a .alpha.-Si.sub.3 N.sub.4 per total weight of silicon nitride and has a Knoop hardness of not less than 15.5 Gpa, and is use as a bearing material or the like.

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patent: 4628039 (1986-12-01), Mizutani et al.
patent: 4746636 (1988-05-01), Yokoyama
patent: 4769350 (1988-09-01), Nishioke et al.
patent: 4820665 (1989-04-01), Ukai et al.

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