| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicon nitride sintered compact having an excellent strength in a temperature range from ordinary temperature to 1,000 deg.C, an excellent oxidation resistance and an excellent static fatigue characteristic. SOLUTION: The silicon nitride sintered compact contains silicon nitride as a main crystalline phase and an amorphous phase present at the grain boundary of the main crystalline phase. At least a part of the amorphous phase is crystallized into at least one kind crystalline phase of RE2 Si3 N2 O5 and RE3 AlSi2 O7 N2 (wherein, RE is at least one of the elements of group 3a of the Periodic Table) within 1 hour at 800 to 1,200 deg.C. |
