Study on the Plastic Removal Mechanism of Nano-ZrO2 Ceramics by Ultrasonic Grinding
The brittleness, plasticity, super-plasticity and the removal mechanisms of critical fragmentation of the nano ZrO2 ceramics were investigated. The formula of critical ductile grinding depth of the common engineering ceramics was inapplicable to the nano-ZrO2 ceramics. A new formula of critical ductile grinding depth of the nano ceramics was established. The ultrasonic vibration grinding experiments showed that the critical ductile grinding depth of the ceramics was 15μm by conventional grinding, but the increment of the critical ductile grinding depth was 60 percent by ultrasonic grinding. The critical ductile grinding depth increased to 25μm. Analyzed by means of SEM, it was transgranular cracking during its cracking process. The nano-ZrO2 ceramics have high toughness so the critical ductile grinding depth increased. The shape, length, width and thickness of the grindings differed greatly from which obtained by conventional grinding.
Bo Zhao, Guanglin Wang, Wei Ma, Zhibo Yang and Yanyan Yan
J. X. Xue et al., "Study on the Plastic Removal Mechanism of Nano-ZrO2 Ceramics by Ultrasonic Grinding", Key Engineering Materials, Vol. 455, pp. 686-689, 2011