Process for producing homogeneous silicon nitride sintered bodies

摘要

A homogeneous silicon nitride sintered body is produced by presintering a shaped body and then subjecting it to treatment by hot isostatic pressing (HIPping) in a special atmosphere at from 1500 to 1700@C and a pressure of over 20.3 MPa and less than 50.7 MPa, or by firing the shaped body in a special atmosphere in such a way that the content of CO gas is not more than 10% at a temperature of not less than 800@C.