张怡,陈志国,魏祥,汪力,侯志伟,杨威.碳化铬基金属陶瓷电火花沉积涂层的微观组织与性能[J].稀有金属材料与工程,2019,48(2):601~607.[Zhang Yi,Chen Zhiguo,Wei Xiang,Wang Li,Hou Zhiwei,Yang Wei.Microstructure and properties of chromium carbide based metal-ceramic coatings by electro-spark deposition[J].Rare Metal Materials and Engineering,2019,48(2):601~607.]
碳化铬基金属陶瓷电火花沉积涂层的微观组织与性能
投稿时间:2017-05-02  修订日期:2017-10-16
中文关键词:  碳化铬基金属陶瓷涂层  电火花沉积  组织结构  性能
基金项目:湖南省应用基础研究重点项目(2016JC2007)
中文摘要:
      采用电火花沉积分别制备了碳化铬基金属陶瓷单涂层和碳化铬基金属陶瓷/Ni复合涂层。采用X射线衍射仪(XRD)、扫描电镜(SEM)、显微硬度计和摩擦磨损试验机对比研究了单涂层和复合涂层的物相、微观组织结构、显微硬度和摩擦磨损性能。结果表明,两种涂层组织结构致密,与基体呈良好的冶金结合,并在涂层内形成了纳米晶的微观组织。复合涂层中FeCr0.29Ni0.16C0.06韧性相含量增加,在涂层界面处存在过渡层Ni,并以塑性变形的方式释放了更多沉积时产生的热应力,因而涂层裂纹明显减少。复合涂层的峰值硬度(1186HV0.05)虽略低于单涂层,但该涂层具有最小的摩擦系数(0.2462),1h磨损量仅为单涂层的1/3,因此表现出更好的耐磨性能,其主要磨损机制为磨粒磨损和疲劳磨损。
Microstructure and properties of chromium carbide based metal-ceramic coatings by electro-spark deposition
英文关键词:chromium carbide based metal-ceramic coatings  electro-spark deposition  microstructure  properties
英文摘要:
      The chromium carbide based metal-ceramic monolithic coating and chromium carbide based metal-ceramic/Ni composite coating were prepared by electro-spark deposition. The phase compositions, microstructure, microhardness and tribological properties of monolithic and composite coatings were characterized comparatively by X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness test, friction and wear test. The results indicate that the two kinds of coatings are dense, metallurgically bonded with substrate and have nanocrystalline microstructure. In composite coating, the content of FeCr0.29Ni0.16C0.06plastic phase increases and Ni transition layer exists at the interface, which could release thermal stress via plastic deformation, therefore the number of cracks reduce significantly. Meanwhile, the maximum microhardness of composite coating (1186HV0.05) is slightly lower than that of monolithic, but it displays the minimum friction coefficient (0.2462), and the wear mass of 1h is only 1/3 of that of monolithic, therefore it displays better tribological properties and the main wear mechanisms are abrasive and fatigue wear.
作者单位E-mail
张怡 中南大学 452190668@qq.com 
陈志国 中南大学  
魏祥 中南大学  
汪力 湖南人文科技学院  
侯志伟 湖南人文科技学院  
杨威 中南大学  
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