铝合金表面激光熔敷铜基复合材料涂层的工艺和组织  

Processing and microstructure of laser cladded Cu base composite coating on the surface of an Al alloy

作　　者：董世运[1] 韩杰才[1] 杜善义[1] 王茂才[2] 

机构地区：[1]哈尔滨工业大学复合材料研究所,黑龙江哈尔滨150001 [2]中国科学院金属研究所金属腐蚀与防护国家重点实验室,辽宁沈阳110015

出　　处：《材料科学与工艺》1999年第4期28-31,共4页Materials Science and Technology

摘　　要：在ＺＬ１０４ 铝合金表面激光熔敷铜基混合粉末（ ｗ （Ｂ）／ ％ ：２０Ｎｉ，８．０Ｃｏ，５ ．０Ｆｅ，６ ．８Ｍｏ，１．５Ｃｒ，３ ．５Ｓｉ，０．２ＲＥ，其余为Ｃｕ） ，制备了高硬度铜基复合材料涂层．研究发现，熔敷层稀释率随光斑宽度和扫描速度增大而减小，随激光束功率增大而显著增大；熔敷比能量是获得质量优良涂层的关键因素．涂层组织在宏观上具有分层现象．球状硬质颗粒弥散分布在细小枝状晶基体中，球状硬质颗粒富含Ｍｏ、Ｃｏ、Ｃｒ、Ｆｅ、Ｓｉ 等元素，而贫Ｃｕ ，基相中贫Ｍｏ．In this paper, a Cu base composite coating with high hardness was fabricated by laser cladding the mixed powder (content, wt%:20Ni, 8.0Co, 5.0Fe, 6.8Mo, 1.5Cr, 3.5Si, 0.2RE.,Cu as base) on the surface of Al alloy ZL104. It was found that dilution ratio of the coating decreased with increasing of spot size and scanning speed of the laser beam under a certain laser power, and obviously increased with increasing of laser power while spot size and scanning speed were constant. The power density was critical parameter to be controlled for fabricating ground coatings. The coating had laminar macrostructure. Spherical hard particles, as reinforced phases for the coating, dispersed in the fine dendritic matrix. Spherical hard particles were depleted of Cu but rich of elements such as Mo, Co, Cr, Fe and Si, while the matrix was reverse in composition.

关 键 词：铝合金 激光熔敷 铜基 复合材料涂层 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TN249[金属学及工艺—金属学]