氮化硅陶瓷高温蠕变试验研究

doi:10.3863/j.issn.1000-2634.1993.03.015

西南石油大学学报(自然科学版) ›› 1993, Vol. 15 ›› Issue (3): 110-116.DOI: 10.3863/j.issn.1000-2634.1993.03.015

氮化硅陶瓷高温蠕变试验研究

徐志跃 J. A. Todd

1.石油机械系 2.美国南加利福尼亚大学

收稿日期:1992-09-25 修回日期:1900-01-01 出版日期:1993-08-20 发布日期:1993-08-20
通讯作者: 徐志跃

TEST STUDY ON HIGH-TEMPERATURE CREEP OF SITICON NITRIDE CERAMICS

Xu Zhiyue J. A. Todd

1.Dept, of Mechanical Eyineering 2.University of Southern California

Received:1992-09-25 Revised:1900-01-01 Online:1993-08-20 Published:1993-08-20
Contact: Xu Zhi-yue

摘要/Abstract

摘要： 本文研究了以6wt%Y2O3和2wt%Al2O3为烧结添加剂的氮化硅材料在1300-1400'C温度范围内的蠕变特性.研究表明该材料系统的蠕变指数n等于2.激活能Q等于700 kJ mol-1.试验结果分析和计界都显示蠕变速率控制机理为氮沿晶界玻璃相扩散的扩散型控制机理.

关键词: 陶瓷复合材料高温材抖蠕变率

Abstract: This paper studies the creep properties of silicon nitride containing 6wt%yttria arid 2wt% ahrmirla in the temperature range of 1300'C to 1400'C .The stress exponent is shown to be 2 and the true activation energy to be 700ks mol-1.The best results and analysis reveal that. the creep mechanism is a diffusion controlled creep mechanism involving nitrogen difus-sion through the grain boundary glassy phase.

Key words: Ceramic composite High-temperature material G

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