等离子喷涂Al2O3陶瓷涂层的显微组织检测技术

doi:10.13251/j.issn.0254-6051.2021.04.039

摘要/Abstract

摘要： 使用自动金相制样设备和光学显微镜对大气等离子喷涂氧化铝陶瓷涂层金相样品制备技术及显微组织评估技术进行研究,确定最佳的制样及评估方法。结果表明:金相试样制备时采用树脂粘接SiC湿砂轮切割片取样、配备正确制样参数的自动化磨抛设备,采用SiC新砂纸研磨和回弹性低的无毛布抛光,能够有效呈现涂层的真实显微组织,解决了涂层孔隙率异常偏大等假象; 烧结碎裂制粉的氧化铝粉末形貌呈棱角状的固有属性可用于涂层未溶颗粒和重熔颗粒的辅助评估;尽量缩小显微镜孔径光阑能有效分辨涂层未熔颗粒、重熔颗粒和氧化物等显微组织特征。

关键词: 等离子喷涂, 氧化铝涂层, 显微组织, 显微镜孔径光阑

Abstract: Metallographic sample preparation technology and microstructure evaluation technology of atmospheric plasma sprayed Al₂O₃ ceramic coating were studied by means of automatic metallographic sample preparation equipment and optical metallographic microscope, then the optimum sample preparation and evaluation methods were determined. The results show that by using resin bonded SiC wet grinding wheel cutting piece sampling, automatic grinding and polishing equipment equipped with correct specimen preparation parameters, SiC new sandpaper grinding and low resilience non wool cloth polishing, the true microstructure of the coating can be effectively revealed, and false images such as unreal abnormal large porosity can be avoided. The inherent angular morphology of Al₂O₃ powder produced by sintered fragmentation can be used for the evaluation of undissolved particles and remelted particles in the coating. As much as possibly reduced microscope aperture can be used to effectively distinguish the microstructure characteristics of the coating such as unmelted particles, remelted particles and oxides, etc.

Key words: plasma spraying, Al₂O₃ coating, microstructure, metallography, microscope aperture

中图分类号:

TG113.25⁺1

解菁, 谢善, 全琼蕊, 李欣. 等离子喷涂Al₂O₃陶瓷涂层的显微组织检测技术[J]. 金属热处理, 2021, 46(4): 210-216.

Xie Jing, Xie Shan, Quan Qiongrui, Li Xin. Metallography technology of plasma sprayed Al₂O₃ ceramic coating[J]. Heat Treatment of Metals, 2021, 46(4): 210-216.

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等离子喷涂Al₂O₃陶瓷涂层的显微组织检测技术

Metallography technology of plasma sprayed Al₂O₃ ceramic coating

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