复合涂层对铝合金铸件表面硬度影响的研究  

Effect of Composite Coating on the Surface Hardness of Aluminum Alloy Casting

作　　者：孙亚琴[1] 潘嘉祺[1] 陈麒忠[1] 姜峰[1] 

机构地区：[1]上海应用技术学院,上海200233

出　　处：《铸造技术》2008年第10期1393-1396,共4页Foundry Technology

基　　金：上海市教委科技发展基金资助项目(项目编号:060Z027)

摘　　要：采用铸渗技术和旋转磁场在铝合金铸件表面涂渗Al2O3、Al2O3+Cr、Al2O3+WC、Al2O3+Ni、Al2O3+碳纤维、Al2O3+石墨涂层,以改进铝合金铸件的表面性能。试验结果表明,铸件表面硬度随涂层中Cr和WC加入量的增加而增加;涂层中碳纤维加入量为20%时,铸件表面硬度达到最大值;涂层中添加石墨和镍不能提高铝合金铸件的表面硬度,但镍可以改善铸件表面质量。铸件表面硬度随浇注温度和磁场搅拌电压的增加而增加,最佳浇注温度和搅拌电压分别为850℃和50V。In order to improve the surface performance of the aluminum alloy casting, the composite coating of Al2O3 ＋ Cr, Al2O3 ＋ WC, Al2O3 ＋ Ni, Al2O3 ＋ C, Al2O3 ＋ carbon fiber were penetrated into the surface of aluminum alloy casting using casting infiltration technology and rotating magnetic field. The experiment results show the surface hardness of aluminum alloy ncreases with increasing the Cr and WC content of composite coating. The maximum surface hardness of aluminum alloy casting can be obtained when the addition of carbon fiber is 20%. The addition of graphite and nickel can not improve the surface hardness of aluminum alloy casting, but nickel alloy coating can improve the surface quality. The surface hardness of the aluminum alloy casting increase with increasing casting temperature and magnetic stirring voltage. The best casting temperature and stirring voltage are 850℃and 50 V respectively.

关 键 词：铝合金铸件 表面硬度 铸渗技术 旋转磁场 

分 类 号：TG174.445[金属学及工艺—金属表面处理]