摘要
采用激光熔覆技术在40CrNi2Si2MoV钢表面制备了不同含量的镍包石墨镍基复合涂层。利用X射线衍射仪(XRD)、扫描电镜、能谱分析仪(EDX)、显微硬度计和摩擦磨损试验机,对不同镍包石墨含量镍基复合涂层的相组成、微观组织形貌、成分、硬度及摩擦磨损性能进行了分析。研究结果表明,不同镍包石墨含量的复合涂层均主要由γ-Ni、Ni3B、M23C6和M7C3相所组成,但有所不同的是,随着镍包石墨含量的增加,复合涂层凝固组织逐渐细化,共晶组织数量逐渐增多,且在镍包石墨添加量超过10.0%(体积分数)时,组织中开始有明显的石墨相出现。受上述组织变化的影响,复合涂层的平均硬度值和耐磨性随着镍包石墨含量的增加而逐渐提高,而减摩性能则呈现出先降后增的变化趋势,当镍包石墨添加量为6.0%(体积分数)时,复合涂层具有最低的减摩性能。
Ni-based composite coatings with different graphite/Ni contents are prepared by laser cladding on the 40CrNi2Si2MoV steel. The microstructure and properties of the composite coatings are investigated by means of X-ray diffraction （XRD）, scanning electron microscopy, energy dispersive X-ray （EDX） spectroscopy, Vickers hardness tester, and friction wear testing machine. The results show that the composite coatings mainly consist of 7-Ni, Nia B, M23 C6, and M7 C3 phases. But with the graphite/Ni addition increasing, the contents of the eutectic increase. The graphite is observed as the graphite/Ni addition is beyond 10.0% （volume fraction）. The changes in the microstructure improve the hardness and the wear resistance of the coatings while the anti-friction property presents a trend of first decreasing and then increasing, and the lowest anti-friction property is obtained as the graphite/Ni addition is 6.0 %.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2013年第8期58-64,共7页
Chinese Journal of Lasers
关键词
激光技术
复合涂层
镍包石墨
微观组织
性能
laser technique
composite coating
graphite/Ni
microstructure
property
