激光熔敷Cr_2Ni_3Si/Cr_3Si金属硅化物复合材料涂层组织与高温耐磨性  

Microstructure and High-Temperature Wear Resistance of Laser Clad Cr_2Ni_3Si/Cr_3Si Metal Silicide Composite Coatings on Austenitic Stainless Steel

作　　者：段刚[1] 王华明[1] 

机构地区：[1]北京航空航天大学,北京100083

出　　处：《稀有金属材料与工程》2003年第5期394-397,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50071004);国家高技术研究发展计划课题(2002AA331030);北京市自然科学基金(2022012);航空基础科学基金(02H51011)

摘　　要：以Cr-Si-Ni高纯预合金化粉末为原料、利用激光熔敷技术在奥氏体不锈钢1Cr18Ni9Ti表面上制得了以金属硅化物Cr3Si为增强相、以复杂多元金属硅化物Cr2Ni3Si为基体的快速凝固金属硅化物复合材料冶金涂层,分析了该涂层的显微组织,在高温滑动磨损条件下测试了其耐磨性能。研究结果表明,Cr3Si金属硅化物的体积分数对激光熔敷Cr2Ni3Si/Cr3Si复合材料涂层的硬度和高温耐磨性有显著影响。由于涂层中硬质耐磨相Cr3Si的抗磨骨干作用,在高温滑动磨损条件下该涂层具有优良的耐磨性能。A rapidly solidified Cr2Ni3Si/Cr3Si metal silicide composite coating was fabricated on an austenitic stainless steel substrate by laser cladding and using Cr-Si-Ni elemental powder blend. The laser clad Cr2Ni3Si/Cr3Si metal silicide composite coating has a homogenous microstructure consisting of Cr3Si primary dendrites and the interdendritic Cr2Ni3Si matrix, and is metallurgically bonded to the substrate. The volume fraction of primary Cr3Si dendrites has a remarkable influence on hardness and wear resistance of the laser clad composite coating. The higher the volume fraction of Cr3Si, the higher the hardness and the wear resistance of the laser clad composite coating. Because of the presence of large amount of hard, wear and oxidation resistant primary Cr3Si dendrites, the laser clad Cr2Ni3Si/Cr3Si metal silicide composite coating has excellent high-temperature wear resistance under high-temperature sliding wear test conditions.

关 键 词：过渡金属硅化物 Cr3Si 涂层 激光熔敷 显微组织 高温磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]