The different were interpreted by superplastic forming mechanism of silicon nitride ceramics. The existence of glass phase can be also proved in the grain boundary during superplastic deformation.

• 而高温断口上却几乎不存在这样的晶粒,这种不同可以用氮化硅陶瓷材料的超塑性变形机理来解释,也可以证明超塑性变形过程中晶界玻璃相的存在。