激光熔覆制备Al_(65)Cu_(20)Cr_(15)准晶态合金及其类似相的研究  

Preparation of coatings containing Al-Cu-Cr quasicrystal and approximants by laser cladding

作　　者：袁伟东[1] 邵天敏[1] 瑟岛[1] 李浩群[1] 

机构地区：[1]清华大学摩擦学国家重点实验室,北京100084

出　　处：《材料科学与工艺》2002年第4期341-345,共5页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50075042)

摘　　要：研究了在45#钢基体表面激光熔覆准晶态Al65Cu20Cr15粉末制备准晶及其类似相涂层过程中,激光功率和扫描速度对激光熔覆涂层相结构的影响.实验结果表明:由于激光功率和扫描速度的变化,基体材料对熔覆涂层的稀释程度发生改变;随着激光熔覆稀释率的增加,熔覆层的相结构依次为β+i,β+d,β,β+Fe;激光熔覆粉末所制备的涂层结构致密,无孔隙和裂纹;涂层的表面显微硬度及摩擦系数等力学性能也因涂层相结构的不同而有所差异.This paper reported the study for preparation of coatings containing Al-Cu-Cr quasicrystalline alloys and approximants by laser cladding Al65Cu20Cr15powder. The observation results of the layers' surface and crosssection by SEM show that the coatings had high density and high bond strength to the substrates, and no pores or cracks were observed. With the slowdown of laser scanning, the composing phases in the laser clad coatings varied as, β+i→β+d→β→β+Fe, at a fixed laser power. And so the mechanical properties,such as microhardness and friction coefficient of the coatings, were different.

关 键 词：激光熔覆 Al-Cu-Cr 准晶态合金 准晶类似相 45钢 表面处理 铝铜铬合金 合金涂层 

分 类 号：TG174.44[金属学及工艺—金属表面处理]