Process for producing silicon nitride sintered material.

摘要

A silicon nitride powder is mixed with powder of cabides and powders of carbides and powders of rare earth element oxides to obtain a mixture. The mixture is shaped and fired in a casing in a nitrogen atmosphere of 1,700 - 2,100 DEG C under the conditions specified by the following formula: <MATH> [x is a firing time (hr) and y is (weight (g) of shaped material to be filled into casing)/(internal volume (cm<3>) of casing)].