Thermal Shock and Cyclic Thermal Shock in Alumina Ceramics

• Main Authors: Kuo, Jung-Zei, 郭宗志
• Other Authors: Chiang-Nan Chang, Chih-Kuang Lin
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/40264921689853152748

碩士 === 國立中央大學 === 機械工程學系 === 84 === Degradation in mechanical properties of a polycrystalline alumina subjected to thermal shock loading was studied via residual flexure strength measurement and several nondestructive evaluation methods. Experimental results of two specimen sizes can be well explained by the thermal elastic and fracture energy theories. In the cyclic thermal shock testing with the quenching temperature difference below the critical temperature difference, no significant thermal fatigue damage was observed as indicated by the results of residual flexure strength measurement and other nondestructive evaluation methods such as dye penetration, ultrasonic and strain gage measurement of elastic modulus, and Vickers indentation har dness and crack growth observation. The evaluation of the applied nondestrucyive evaluation methods as a detecting tool for thermal shock damage is conducted by comparing with the results of residual flexure strength measurement.