Silicon nitride sintered body

Details Silicon nitride sintered body Silicon nitride sintered body

1993-10-18

1995-06-13

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 35593, C04B 35599

Patent

active

054242568

ABSTRACT:
Silicon nitride sintered bodies consisting of prismatic crystal grains of Si.sub.3 N.sub.4 and/or sialon, equi-axed crystal grains of Si.sub.3 N.sub.4 and/or sialon, a grain boundary phase existing among the prismatic and equi-axed crystal grains and dispersed particles in the grain boundary phase, in which the prismatic crystal grains have an average grain size of 0.3 .mu.m or less in minor axis and an average grain size of 5 .mu.m or less in major axis, the equi-axed crystal grains have an average grain size of 0.5 .mu.m or less and the dispersed particles have an average size of 0.1 .mu.m or less, the volume of the dispersed particles being 0.05% by volume or more based on the total volume of the rest of the sintered body. The silicon nitride sintered bodies have a strength sufficient for use as structural materials of machine parts or members, with a minimized scattering of the strength as well as high reliability, superior productivity and advantageous production cost.

REFERENCES:
patent: 4978645 (1990-12-01), Ukyo et al.
patent: 5045513 (1991-09-01), Mizuno et al.
patent: 5098872 (1992-03-01), Suyama et al.
patent: 5204297 (1993-04-01), Yamamoto et al.
patent: 5238884 (1993-08-01), Sakai et al.

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