INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effect of Grinding Process on Surface Quality and Mechanical Properties of Al2O3 Ceramics |
LIANG Jingjing1, ZHANG Xiangzhao1, ZHAO Guanghui1, LIU Guiwu1, SHAO Haicheng1, QIAO Guanjun1,2
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1 School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; 2 State Key Laboratory of Metal Material Strength, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract Ahigher requirement for the surface quality of Al2O3 ceramic had been put forward to adapt the rapidly development in the aerospace or other fields. At present, the grinding process was one of the most commonly used methods for ceramic surface processing due to the high precision of grinding and high material removal rate. Therefore, it was greatly significant to clarify the relationship among grinding processing methods, surface quality and mechanical properties. The surface processing of Al2O3 ceramic was performed using the precision grinding/polishing machine and grinding machine. The effect of different grinding conditions involving grinding disc speed, the abrasive grain size of grinding disc or wheel, the longitudinal feed or horizontal translation speed of grinding wheel on the surface quality, surface residual stress and mechanical properties of Al2O3 ceramic were investigated and discussed. The experimental results show that a more rough surface (such as the processing scratches) was observed on the surface of Al2O3 ceramic after the grinding machine processing, indicating that the surface processing used by grin-ding machine had a greater influence on the surface quality of Al2O3 ceramic compared to the grinding disc processing. Furthermore, the removal mechanism of Al2O3 ceramics during grinding processing was a mixture of brittle removal and ductile removal, and the surface residual stresses exhibit compressive stress after processing. Especially, the removal mechanism of Al2O3 ceramics was mainly ductile removal and the surface residual compressive stress was up to -241 MPa in the case of fine abrasive grain size of grinding disc or wheel, large grinding disc rotation speed, small longitudinal feed and large horizontal translation speed of grinding wheel. The surface roughness, microstructure and surface residual stress had a comprehensive effect on the bending strength of Al2O3 ceramics. The bending strength increased to 528 MPa with decreasing the surface roughness and residual compressive stress of Al2O3 ceramic.
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Published: 24 July 2020
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Fund:This work was financially supported by the Natural Key R & D Program of China (2017YFB0310400), the National Natural Science Foundation of China (51572112). |
About author:: Jingjing Liangreceived her B.S. degree in material science and engineering from Henan University of Urban Construction in 2017. She is currently pursuing her M.D. at the College of Material Science and Engineering in Jiangsu University. Her research has focused on surface micromachining of engineering ceramic materials. Xiangzhao Zhangobtained his Ph.D degree from the Jiangsu University. He performed collaborative research during 2017—2018 in Tokyo Institute of Technology (Japan). He has focused on high temperature wetting, joining and compounding between metal/ceramics, as well as first-principle calculations based on DFT. He has published about 20 papers in journals, applied 9 national invention patents cooperatively. And he has involved in one National Natural Science Foundation(51572112), one Natural Science Foundation of Jiangsu Province(BK20151340). |
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