MgO添加量对Ni-WC真空熔烧涂层组织及热疲劳性能的影响  

Effects of MgO Content on Microstructure and Thermal Fatigue Property of Ni-WC Coating Formed by Vacuum Fusion Sintering

作　　者：王晓达[1] 王亚男[1] 翟羽佳[1] 

机构地区：[1]辽宁科技大学材料科学与工程学院,辽宁鞍山114044

出　　处：《热加工工艺》2007年第23期53-56,共4页Hot Working Technology

摘　　要：采用真空熔烧的方法制得Ni-WC-MgO复合涂层试样,利用扫描电镜和能谱仪分析了MgO添加量对涂层纵截面微观组织形貌、熔烧带处元素扩散、WC形貌及抗热疲劳性能的影响。结果表明:MgO的添加对涂层的组织和抗热疲劳性能有很大的影响。涂层和基体间结合致密,存在明显的过渡区,当MgO添加量为0.5%时涂层中的缺陷最少,结合最好;涂层中的Ni、Cr、W、C等元素向母材方向扩散,母材中的Fe向涂层中扩散,结合处Fe、Ni扩散最为明显;当MgO含量为0.5%时涂层中WC最为细小,使涂层的抗热疲劳性能最好。The Ni-WC-MgO compound coatings was made by using vacuum fusion sintering （VFS）, the effects of MgO additive content on the microstructure of coatings＇ longitudinal section, the elements diffusion on the fusion band. the morphology of WC and the thermal fatigue property were studied by scanning electron microscope （SEM） and energy-dispersive spectrometer （EDS）. The results show that the adding of MgO has great effects on the microstructure and thermal fatigue property of the coatings. There is obvious transition region between coating and matrix, it is bonding closed, when the content of MgO is 0.5%, the defect in the coating is the least, the bonding is the best; the elements of Ni, Cr, W, C etc in the coating diffuse into the base metal, the Fe element in the base metal diffuse into the coating, and the Fe, Ni diffusion is obvious on the bonding region; when the content of MgO is 0.5%, the WC in the coating is the finest, which makes the thermal fatigue property of the coating be the best.

关 键 词：MGO 涂层 真空熔烧 组织 热疲劳 

分 类 号：TG174.44[金属学及工艺—金属表面处理]