(华北电力大学 动力工程系， 北京 102206)
摘 要: 利用电热线爆定向喷涂方法在45钢基体上制备了stellite/WC复合涂层， 运用扫描电镜及能谱分析对复合涂层的形貌、 微观结构以及涂层的基体结合机理进行了分析， 利用纳米硬度计测量了复合涂层的硬度和弹性模量。结果表明： 涂层致密， 无层状结构出现； 喷涂过程中涂层颗粒在基体上的快速凝固使得涂层晶粒细小均匀， 晶粒为200~500 nm； 涂层与基体界面发生了元素扩散现象， 为扩散-冶金结合； 涂层硬度的最大值为18.6 GPa， 模量的最大值为310 GPa， 硬度和模量沿横截面都呈现先增加而后减小的变化趋势。
关键字: 电热线爆定向喷涂； stellite/WC复合涂层； 硬度；模量
（ Department of Power Engineering,
North China Electric Power University, Beijing 102206, China）
Abstract: Stellite/WC composite coating was prepared on medium carbon steel substrate by electrothermal explosion directional spraying of wire. The microstructure of coating and bonding mechanism between coating and substrate were analysed through SEM and EDS. The distribution of hardness and elastic modulus of the coating were determined by nanoindentation. The results show that the composite coating is dense and has not laminar structure. The grains of coating solidify rapidly on the substrate, which make the grain of composite coating become very fine, and the grain size is 200-500 nm. The element diffusion occurs in the interface between substrate and coating, and the joining mechanism between coating and substrate is metallurgical bond. The maximum hardness and elastic modulus are 18.6 GPa and 310 GPa, respectively. The hardness and elastic modulus rise at first, and then descend along section.
Key words: electrothermal explosion directional spraying of wire; stellite/WC composite coating; hardness; modulus
