激光熔覆Cr_7C_3增强铬镍硅涂层组织与耐磨性  

Microstructure and wear resistance of laser clad Cr_7C_3 reinforced Cr-Ni-Si coating

作　　者：刁望勋[1] 汤海波[1] 方艳丽[1] 刘栋[1] 张述泉[1] 王华明[1] 

机构地区：[1]北京航空航天大学大型整体金属构件激光直接制造教育部工程研究中心,北京100191

出　　处：《激光技术》2011年第4期457-460,467,共5页Laser Technology

基　　金：国家自然科学基金资助项目(50625413)

摘　　要：为了提高材料耐磨性,以Cr_3C_2和0.47Cr-0.50Mi-0.03Si合金粉末为原料,利用激光熔覆制备工艺,在A3钢表面制得了Cr_7C_3硬质相增强Cr-Ni-Si金属硅化物复合材料涂层;利用光学显微镜、扫描电子显微镜、X射线衍射仪、能谱仪与电子探针等分析了涂层的显微组织,并在室温干滑动条件下测试其耐磨性能。结果表明,硬质颗粒相Cr_7C_3的加入,显著提高了Cr-Ni-Si金属硅化物涂层的硬度,涂层具有良好的室温耐磨性能。A wear resistant Cr7 C3 reinforced Cr-Ni-Si ternary metal sihcide composite coating was fabricated on a substrate of A3 mild steel by means of laser cladding with Cr3C2 and 0. 47Cr-0. 50Ni-0. 03Si alloy powder as the precursor material, The microstructure and composition of the coating were investigated by means of optical microscopy, scanning electron microscopy, X- ray diffraction, energy dispersive spectrometer and electron probe micro-analyzer. Then the wear resistance of the coating was tested under dry sliding wear condition at room temperature. Results indicated that, microhardness of the Cr-Ni-Si coating was evidently improved because of the introduction of Cr7 C3. The laser clad Cr7 C3 reinforced Cr-Ni-Si ternary metal silicide composite coating shows excellent wear resistance under dry sliding wear test conditions.

关 键 词：激光技术 激光熔覆涂层 显微组织 耐磨性 Cr_7C_3 

分 类 号：TF123.33[冶金工程—粉末冶金] TG115.58[冶金工程—冶金物理化学]