| 摘要 |
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 d1 of principal plane of plate of the plate particles and the shorter diameter d2 of the same plane has a relation of d1/d2<10, and the thickness of plate of the plate particles is 1/5 or below of d2.
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