Antonelli, Terry & Wands
High toughness silicon nitride sintered body and process for producing the same
 A high toughness silicon nitride sintered body comprises silicon nitride as a main component and at least one member selected from the group consisting of silicides and carbides in the form of plate particles, of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W. In the sintered body, the longer diameter d.sub.1 of principal plane of plate of the plate particles and the shorter diameter d.sub.2 of the same plane has a relation of d.sub.1 /d.sub.2 <10, and the thickness of plate of the plate particles is 1/5 or below of d.sub.2. 
Hitachi, Ltd.
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Tadahiko Hiroshi
Miyoshi Sakamoto