铝合金表面纳米化--微弧氧化复合涂层摩擦行为  

Tribological behavior of SNC-MAO composite coatings formed on the surface of aluminum alloys

作　　者：文磊[1] 王亚明[2] 金莹[1] 

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083 [2]哈尔滨工业大学特种陶瓷研究所,哈尔滨150080

出　　处：《工程科学学报》2015年第10期1350-1357,共8页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51201008);教育部博士点科研基金资助项目(20120006120043);高等学校学科创新引智计划资助项目(B12012)

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.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.

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 

分 类 号：TG174.4[金属学及工艺—金属表面处理]