Research on Micro-Mechanism of Nano-Composite Ceramic in Two-Dimensional Ultrasound Grinding
Surface microstructure of nano-composite ceramics prepared by mixed coherence system and machined by two-dimensional ultrasonic precision grinding was researched using TEM, SEM, XRD detector and other equipments. Structure, formation mechanism and characteristic of metamorphic layer of ground surface of nano-composite ceramics were researched. The experiment shows micro deformation mechanism of ceramic material in two-dimensional ultrasound grinding is twin grain boundary and grain-boundary sliding for A1<,2>O<,3>, and it is crystal dislocation of enhanced phase, matrix grain boundary sliding, coordination deformation of intergranular second phase as well as its deformation mechanism for nano-composite ceramics. The fracture surfaces of nano-composite materials with different microscopic structure were observed using TEM and SEM. Research shows that ZrO<,2> plays an important influence on the generation and expansion of crack, and enhances the strength of grain boundaries. When grain boundaries is rich in the ZrO<,2> particles, the crack produced in grinding process will be prevented, and the surface with plastic deformation will be smooth. The results shows nanoparticles dispersed in grain boundary prevents crack propagation and makes materials fracture transgranularly which makes the processed surface fine.
Two-dimensional ultra-precision grinding Nano-composite ceramic Surface fracture Surface microstructure Surface metamorphic layer
Bo Zhao Yan Wu Guofu Gao Feng Jiao
School of Mechanical & Power Engineering, Henan Polytechnic University, Jiaozuo, China School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai, China School of Mechanical & Power Engineering, Henan Polytechnic University, Jiaozuo, China School of Mec
国际会议
第14届全国磨粒技术学术会议(14th Conference of Abrasive Technology in China)
南京
英文
344-348
2007-10-26（万方平台首次上网日期，不代表论文的发表时间）