Creep cavitation in silicon nitride by pulse-echo technique

被引：0
|
作者：
Lofaj, F [1 ]
机构：
[1] Slovak Acad Sci, Inst Mat Res, Kosice 04353, Slovakia
来源：
KOVOVE MATERIALY-METALLIC MATERIALS | 2002年 / 40卷 / 03期
关键词：
tensile creep; cavitation; ultrasonic velocity; silicon nitride; elastic moduli;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The pulse-echo technique for ultrasonic velocity measurement was used for nondestructive study of creep damage in an advanced silicon nitride; SN88, during interrupted tensile creep tests at 1400degreesC under stress of 150 MPa. Linear relationships were found between strain and the longitudinal and shear wave velocities, Poisson's ratio, Young's, shear and bulk moduli. Density measurement indicated a coefficient of proportionality of similar to0.7 between the volume fraction of cavities and tensile strain. Cavitation was therefore concluded to be the main creep mechanism and the reason for ultrasonic velocity and elastic moduli degradation in the studied silicon nitride. The ultrasonic velocity technique was demonstrated to be simple, sensitive and reliable nondestructive method for monitoring of creep damage during intermittent creep in silicon nitride.
引用
收藏
页码：184 / 194
页数：11
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