| 铝合金表面纳米化——微弧氧化复合涂层摩擦行为 |
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| 作者姓名： | 文磊 王亚明 金莹 |
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| 作者单位： | 1. 北京科技大学国家材料服役安全科学中心, 北京 100083; |
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| 基金项目： | 教育部博士点科研基金资助项目(20120006120043)国家自然科学基金资助项目(51201008) |
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| 摘 要： | 通过表面机械研磨处理在LY12CZ铝合金表面制备表面纳米化(SNC)过渡层,再采用微弧氧化(MAO)技术对纳米晶过渡层进行微结构重构,设计制备出纳米化-微弧氧化(SNC-MAO)复合涂层,并对比研究了铝合金表面微弧氧化涂层及纳米化-微弧氧化复合涂层的摩擦学行为.与微弧氧化涂层相比,纳米化-微弧氧化复合涂层因硬度较高而具有较好的耐磨性.微弧氧化涂层及纳米化-微弧氧化复合涂层与GCr15钢球对磨时具有相同的磨损机理,为对磨钢球向涂层的材料转移和氧化磨损.
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| 关 键 词： | 铝合金 复合涂层 摩擦学 纳米化 表面机械研磨处理 微弧氧化 |
| 收稿时间： | 2014-11-28 |
Tribological behavior of SNC-MAO composite coatings formed on the surface of aluminum alloys |
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| Affiliation: | 1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;2. Institute of Advanced Ceramics, Harbin Institute of Technology, Harbin 150080, China |
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| Abstract: | A duplex process was designed to modify the surface of LY12 CZ aluminum alloy by using surface mechanical attrition treatment(SMAT) prior to microarc oxidation(MAO). A surface nanocrystalline(SNC) layer was formed on the alloy surface by SMAT,a ceramic outer layer grew on the SNC layer by MAO,and finally an SNC-MAO composite coating was fabricated. The tribological behaviors of the MAO coating and SNC-MAO composite coating were comparatively evaluated. Experimental results showed that the SNC-MAO composite coating had a better wear resistance than the MAO coating in the same test condition due to a higher hardness of the ceramic coating. The wear mechanism of the MAO coating and SNC-MAO composite coating involved materials transfer from the steel ball to the coating and oxidation wear. |
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