纳米复相陶瓷在超声磨削中的高循环疲劳性能试验研究

his paper analyzed the fatigue properties of nanocomposite ceramic in ultrasonic vibration-assisted grinding. According to the actual condition of ultrasonic vibration-assisted grinding and similarity law, a similarity experiment was built. Experiments validated the analysis results: fatigue life and flexural strength under ultrasonic were significantly lower than without, and reduced with increment of ultrasonic frequency, and increased with the increasing of zirconia content, it had good mechanical property about 25% and then decline; crack propagation speed at high ultrasonic frequency was lower than the low ultrasonic frequency; fracture model was more tend to the mix of transgranular and intergranular under the effect of ultrasonic, and dimple was more obvious and cleavage plane was more complex in fracture with increment of ultrasonic frequency. The results showed that the ultrasonic vibration-assisted grinding was an efficient, ultraprecise mirror processing technology for nanocomposite ceramics.