Microstructure and Properties of Microarc Oxidation Ceramic Coatings on Aluminum Alloy

Wanhui Liu; Ailian Bao; Xinyu MaoGuanghai Zheng

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Microstructure and Properties of Microarc Oxidation Ceramic Coatings on Aluminum Alloy

机译：Microstructure and Properties of Microarc Oxidation Ceramic Coatings on Aluminum Alloy

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The paper discusses structure and property aspects of oxide films formed on 7075 aluminum alloys by microarc oxidation in alkali-silicate electrolytic solution. Microstructure, surface morphology and phase composition of the ceramic coatings were investigated by SEM and XRD. Distribution of hardness along the coating thickness was determined by microhardness analyses. The friction and wear behavior of the oxide films against steel counterparts was evaluated with a friction and wear tester. The results showed that the microarc oxidation coatings composed mainly of α-Al_2O_3 and γ-Al_2O_3 phase are dense and uniform, which indicates that the wear resistance of Al alloy could be improved obviously by microarc oxidation. The films possess a beneficial combination of 25 ～ 45 μm thickness, HV_(0.1) 1500 microhardness and provide a low wear rate but a relatively high friction coefficient against GCrl5 steel under dry friction condition.

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来源
《Key engineering materials》 |2007年第3期|1895-1898|共4页
作者
Wanhui Liu; Ailian Bao; Xinyu MaoGuanghai Zheng;
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作者单位

Heilongjiang Institute of Science and Technology, College of Materials Science and Engineering;

Heilongjiang Harbin;

150027, China;

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原文格式 PDF
正文语种英语
中图分类工程基础科学;
关键词
microarc oxidation; aluminum alloys; microstructure; wear resistance;

Microstructure and Properties of Microarc Oxidation Ceramic Coatings on Aluminum Alloy

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