铸造铝合金预置Si粉激光表面合金化研究  

Laser surface alloying on cast aluminum alloy with pre-painted Si powder

作　　者：蔡利芳[1] 张永忠[1] 石力开[1] 席明哲[1] 

机构地区：[1]北京有色金属研究总院国家有色金属复合材料工程技术研究中心,北京100088

出　　处：《金属热处理》2008年第9期12-15,共4页Heat Treatment of Metals

基　　金：国家"973"计划课题(2006CB605206-1)

摘　　要：为了改善铸造铝合金的表面性能,以Si粉作为预置涂层材料,采用高功率CO2激光器进行表面合金化处理,在A357铸造铝合金表面制备了未熔Si颗粒均匀分布的高硅Al-Si合金涂层,整个涂层组织致密、无气孔、无裂纹,在油润滑条件下测试了激光表面合金化层的耐磨性。结果表明,激光表面合金化处理后A357合金表面改性层的维氏硬度和耐磨性均得到显著提高。In order to improve the surface properties of cast aluminum alloy, laser surface alloying with pre-painted silicon powders was carried out on A357 alloy. The mierostructure of the alloying layer is characterized as un-melted Si particulates distributed evenly hypereuteetic Al-Si coating. The coating is dense,without pores and cracks. The wear resistance of laser surface alloying layer was evaluated under oil lubrication wear test conditions. The results show that the Vickers microhardness and the wear resistance of the A357 alloy are significantly improved after laser surface alloying treatment.

关 键 词：激光表面合金化 铝合金 高硅Al-Si涂层 

分 类 号：TG156.8[金属学及工艺—热处理]