Effects of Temperature on Notch Flexure Strength of Alumina Ceramics
Zhao Kang¹,Wei Jianfeng¹,YanJunhui²,Sun Jun¹,Zheng Xiulin²
(1. School of Material Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China; 2. College of Materials Science and Engineering, Northwest Polytechnical University)

Abstract: The effects of temperature on the notch flexure strength of alumina are experimentally investigated. Test results show that the flexure strength and notch flexure strength almost keep constant when alumina is tested in temperature 20¡«800 degrees C, and the deviation of flexure strength and notch flexure strength decreases with test temperature increasing. When temperature is over 950 degrees C, the flexure strength and notch flexure strength decrease significantly. Analysis suggests that when the working temperature is below 800 degrees C, it is reliable and safe to perform strength design of alumina without considering the temperature effects, and the notch flexure strength can be predicted by means of flexure strength at room temperature and stress concentration factor, which offers a new approach to high temperature strength design and prediction of notched elements of advanced structural ceramics.
Keywords: flexure strength;notch flexure strength;ceramics;alumina;strength prediction

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