(華北電力大學(xué) 動力工程系， 北京 102206)
摘 要: 利用電熱線爆定向噴涂方法在45鋼基體上制備了stellite/WC復(fù)合涂層， 運用掃描電鏡及能譜分析對復(fù)合涂層的形貌、 微觀結(jié)構(gòu)以及涂層的基體結(jié)合機理進行了分析， 利用納米硬度計測量了復(fù)合涂層的硬度和彈性模量。結(jié)果表明： 涂層致密， 無層狀結(jié)構(gòu)出現(xiàn)； 噴涂過程中涂層顆粒在基體上的快速凝固使得涂層晶粒細小均勻， 晶粒為200~500 nm； 涂層與基體界面發(fā)生了元素擴散現(xiàn)象， 為擴散-冶金結(jié)合； 涂層硬度的最大值為18.6 GPa， 模量的最大值為310 GPa， 硬度和模量沿橫截面都呈現(xiàn)先增加而后減小的變化趨勢。
關(guān)鍵字: 電熱線爆定向噴涂； stellite/WC復(fù)合涂層； 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
