6061铝合金激光熔覆铜基复合涂层组织及磨损性能  

Microstructure and Wear Resistance of Cu-based Composite Coating on 6061 Aluminum Alloy by Laser Cladding

作　　者：魏广玲[1] 潘学民[1] 

机构地区：[1]大连理工大学材料科学与工程学院,三束材料改性国家重点实验室

出　　处：《特种铸造及有色合金》2010年第4期372-375,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50704009);辽宁省博士启动基金资助项目(20031081)

摘　　要：利用激光熔覆工艺在6061合金表面熔覆铜基复合涂层,分析熔覆涂层的微观组织及化学成分,考察熔覆合金成分变化对涂层质量、硬度以及磨损性能的影响。结果表明,熔覆层主要由(Cu,Ni)固溶体、Cu9Al4、AlFe0.23Ni0.77以及CoFe增强相等组成。优化成分条件下,Fe含量为7%,Co含量为9%,熔覆层硬质颗粒体积分数增大,大量硬质颗粒增强体弥散分布在熔覆层Cu-Ni固溶体合金基体组织中,大大增强了基体的抗磨损性能。激光熔覆后的熔覆层表面硬度比6061铝合金提高了4.5倍;磨损体积约为铝合金基线的30%,摩擦因数降至0.3002。Cu-based composite coating was formed on the surface of 6061 aluminum alloy by laser cladding method. The microstructure and chemical composition of the coating were analyzed to understand effects of the change of cladding alloy composition on quality, micro-hardness and wear resistance of the coating. The results reveal that cladding coating is mainly composed of (Cu, Ni) solid solution, Cu9Al4, AlFe0.23Ni0.77 and CoFe phase. In condition of optimized chemical composition, with Fe and Co contents of 7%, 9%, respectively, amounts of hard particle reinforcements are uniformly dispersedly distributed into Cu-Ni solid solution in cladding coating, which improves the wear resistance of the 6061 aluminum alloy matrix. Compared with those of 6061 aluminum alloy matrix, surface hardness of cladding coating is increased by 4.5 times, and frictional volume and frictional coefficient are decreased to 30% and to 0.301, respectively, after laser cladding treatment.

关 键 词：熔覆 复合涂层 硬质颗粒 磨损性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]