| 摘要 |
A sintered silicon nitride type ceramic article of fine surface grain and high mechanical strength is produced with a small loss of weight during the sintering at 1650 DEG C- 1850 DEG C from a ceramic mixture consisting of not more than 10% by weight of rare earth elements, not more than 10% by weight aluminium oxide, not more than 10% by weight aluminium nitride and the balance of silicon nitride having a beta -phase content of at least 50%. |
