| 摘要 |
A process for producing silicon nitride ceramic articles is disclosed, which includes the steps of preparing a mixed powder of silicon nitride and a sintering aid, shaping the mixed powder, sintering the shaped body, machining the sintered body in a desired shape, and then heating the machined sintered body in a temperature range from 550 DEG C. to 900 DEG C. in an oxidizing atmosphere. Alternatively, after the sintering, the sintered body is heated in a temperature range from 950 DEG C. to 1,400 DEG C. to crystallize an Si3N4 grain boundary phase, the crystallized sintered body is machined into a desired shape, and the machined body is heated in a temperature range from 550 DEG C. to 900 DEG C. in an oxidizing atmosphere. Thereby, silicon nitride ceramic articles having high strength at room temperature can be obtained.
|
