采用热扩散（TD）处理法在冷作模具Cr12MoV表面通过热辐射扩散处理制备了VC涂层,通过扫描电镜、能谱仪和XRD等手段对涂层表面组织结构进行了分析,对结合界面化学元素线能谱进行了分析,并对相互扩散后的冶金结合机理进行了讨论。结果表明,VC涂层是由C和V原子组成,其孔度组织面积百分比为5.71%,晶粒平均直径0.42μm;VC涂层结合界面处化学元素发生了相互扩散,促进冶金结合的形成,其结合强度为47.1 N;热辐射元素扩散过程为涂层中V和C原子向界面和近界面基体扩散,Cr原子主要来自于基体中Cr向涂层中扩散,Si和Mo原子含量没有明显的扩散现象,Fe原子从基体中高含量降低到涂层中低含量,Fe原子热扩散过程被抑制。
VC coatings were prepared on surface of Crl2MoV cold working die steel by TD （thermal diffusion） process. The surface morphology and structure of the coatings were observed by means of scanning electron microscopy （SEM） with energy dispersive spectrometer （EDS） and X-ray diffraction （XRD）. Bonding mechanism of the coating interface was discussed. The results show that C and V atoms are detected in the VC coatings, in which the area percentage of pores is 5.71% , and the average grain size is 0.42 μm. The mutual diffusion of chemical elements occurs at the coating interface, promoting the formation of metallurgical binding between the coatings and substrate with bonding strength of 47.1 N. It is suggested that C and V atoms in the coating are diffused to the interface and near interfacial substrate, Cr atom mainly comes from the diffusion of Cr in the substrate to the coating in TD process, however, no significant diffusion of Si and Mo is observed, and Fe content decreases from the high values in the substrate to the lower values in the coatings, the diffusion of Fe atoms is restrained in TD process.
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