| BAO Ai-Iian,LIU Wan-hui.Wear Resistance of Micro-arc Oxidized Ceramic Layers on Aluminum alloy[J],36(6):48-49 |
| Wear Resistance of Micro-arc Oxidized Ceramic Layers on Aluminum alloy |
| Received:August 31, 2007 Revised:December 10, 2007 |
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| KeyWord:Micro-arc Oxidation Aluminum alloys Ceramic Coating Wear resistance |
| Author | Institution |
| BAO Ai-Iian |
Heilongjiang Institute of Science and Technology, School of Materials Science and Engineering, Harbin , China |
| LIU Wan-hui |
Heilongjiang Institute of Science and Technology, School of Materials Science and Engineering, Harbin , China |
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| Abstract: |
| The structure and property aspects of oxide films formed on 7075 aluminum alloys by micro-arc oxidation in alkali-silicate electrolytic solution was discussed. 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 micro-hardness analyses. The friction and wear behavior of the oxide films against steel counterparts was evaluated with a friction and wear tester. The results show that the micro-arc oxidation coatings composed mainly of a-A1203 and 'y-Al203 phase are dense and uniform, which indicates that the wear resistance of Al alloy could be improved obviously by micro-arc oxidation. The films possess a beneficial combination of 25 ~ 45 μm thickness, HVo.11900 micro-hardness and provide a low wear rate but a relatively high friction coefficient against GCr15 steel under dry friction condition. |
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