Y-α-β Sialon复相陶瓷的显微结构和蠕变行为

无机材料学报, 2001, 16(6): 1113-1120. doi: 10.3321/j.issn:1000-324X.2001.06.014

Y-α-β Sialon复相陶瓷的显微结构和蠕变行为

林明通 ^1, , 蒋丹宇 ^2, , 汪霖 ^3, , 阮美玲 ^4, , 施剑林 ^5,

1.中国科学院

2.中国科学院

3.中国科学院

4.中国科学院

5.中国科学院

关键词：复相sialon , 蠕变 , 显微结构 , 氧化 , 相变

Microstructure and Creep Behavior of a Y-α-β Sialon Composite

研究了一种以YAG为晶界相和理论初始α/β比率为65/35的Y-c-β复相sialon在温度1250～1350°C和应力110～290MPa的四点弯曲蠕变行为,得出在1250、1300、1350°C下的应力指数分别为1.31、1.49、1.62,蠕变激活能为677kJ.mol-1,显微结构观察表明几乎所有的空洞都位于多晶界,从而推断伴随着多晶界空洞形成的扩散-滑移耦联机制是蠕变的速率控制机制.Monkman-Grant关系式得出的蠕变速率指数p值为1.6,蠕变断裂是由多三晶界空洞的成核、生长、聚结和连接引起的.

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Y-α-β Sialon复相陶瓷的显微结构和蠕变行为

Microstructure and Creep Behavior of a Y-α-β Sialon Composite

参考文献