Study on fracture of zirconia and alumina ceramics based on acoustic emission technology

Abstract

By comparing the commonly used 95 type zirconia ceramics and 99 type alumina ceramics in engineering, acoustic emission technology was used to monitor the stress failure process of the two types of ceramics. Corresponding acoustic emission signals were collected and analyzed. The differences in acoustic emission signal counting rate, signal timefrequency domain, and acoustic emission energy were obtained for the damage evolution process of the two types of ceramics. After analysis, it was found that the acoustic emission activity intensity of 95 type zirconia ceramics was much higher than that of 99 type alumina ceramics in the experiment. At the same time, it was found that the acoustic emission signal frequency of these two types of ceramics would decrease when approaching the fracture state. This can effectively determine the state of these two types of ceramics.