MoSi2对等离子喷焊钴基合金层组织和耐磨性的影响  

Effect of MoSi_(2) on Microstructure and Wear Resistance of Cobalt-base Alloy Coating Prepared by Plasma Spray Welding Technology

作　　者：汪锡恒 宋琪 潘德成 房磊琦 李明喜[2,3] WANG Xiheng;SONG Qi;PAN Decheng;FANG Leiqi;LI Mingxi(Research Center of Modem Surface and Interface Engineering,Anhui University of Technology,Ma’anshan 243002,Anhui China;School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243000,Anhui China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Ma’anshan 243002,Anhui China)

机构地区：[1]安徽工业大学现代表界面工程研究中心,安徽马鞍山243000 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243000 [3]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243000

出　　处：《热处理》2021年第3期1-6,共6页Heat Treatment

基　　金：安徽省重点研究与开发计划项目资助(1804a09020006)。

摘　　要：采用等离子喷焊技术在Q235钢试样上制备了不含及含1%、3%和5%MoSi_(2)(质量分数)的钴基合金层。采用X射线衍射、扫描电镜和能谱分析等研究了喷焊层不同区域的显微组织和相成分;测定了喷焊层的硬度分布;通过摩擦磨损试验检测了喷焊层的摩擦因数和磨损率。结果表明:喷焊层的物相主要为γ-Co和 Cr_(23)C_(6);含5%MoSi_(2)的喷焊层出现MoSi_(2)相和大量形状不规则的组织,硬度为544.18HV0.3,比不含MoSi_(2)的喷焊层提高了约173.97HV0.3,其磨损率也最小,约为0.75×10^(-14)m^(3)/(N·m)。MoSi_(2)能显著改善钴基合金喷焊层的耐磨性。Cobalt-base alloy coatings without MoSi_(2) and with 1%,3%,and 5%MoSi_(2) by mass were prepared on Q235 steel specimens by a plasma spray welding technology.The microstructure and phase components in the different areas of spray welded coatings were investigated by using X-ray diffraction,scanning electron microscope and energy dispersive spectrum.Hardness distribution in the spray welded coatings was tested,and friction coefficient and wear rate of the coatings were detected by the aid of friction-wear test.The results showed that phases in the coatings were predominantlyγ-Co and Cr_(23)C_(6),and that the coating with 5%MoSi_(2) exhibited MoSi_(2) phase and a large amount of irregularly shaped structure,as well as hardness of 544.18 HV0.3 which is about 173.97 HV0.3 higher that of the coating without MoSi_(2),and the lowest wear rate of about 0.75×10^(-14)m^(3)/(N·m).The addition of MoSi_(2) makes it possible to improve considerably wear resistance of the spray welded cobalt-base alloy coating.

关 键 词：等离子喷焊 钴基合金 硅化钼 摩擦磨损 

分 类 号：TG456.2[金属学及工艺—焊接]