Effect of Grinding Process on Surface Quality and Mechanical Properties of Al2O3 Ceramics

被引：0
|
作者：
Liang J. [1 ]
Zhang X. [1 ]
Zhao G. [1 ]
Liu G. [1 ]
Shao H. [1 ]
Qiao G. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Jiangsu University, Zhenjiang
[2] State Key Laboratory of Metal Material Strength, Xi'an Jiaotong University, Xi'an
来源：
Cailiao Daobao/Materials Reports | 2020年 / 34卷 / 16期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Al[!sub]2[!/sub]O[!sub]3[!/sub] ceramics; Bending strength; Grinding process; Residual stress; Surface roughness;
D O I：
10.11896/cldb.19080144
中图分类号：
学科分类号：
摘要：
A higher 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. © 2020, Materials Review Magazine. All right reserved.
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页码：16020 / 16024
页数：4
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