采用等离子喷涂方法在 LY12铝上制备了Ta/W/Sn复合涂层.研究了各种工艺参数对涂层材料熔化程度和沉积效率的影响.采用扫描电子显微镜观察了复合涂层的表面及界面,精密机械天平称量涂层的增重,力学拉伸机测量涂层的抗拉结合强度,能谱和化学方法分析涂层的化学成分.结果表明,等离子喷涂工艺可以制作组织致密、厚度均匀的Ta/W/Sn复合涂层;喷涂功率和送粉速率对材料的熔化状态影响较大,在特定喷距范围内喷距的影响则较小.
Ta/W/Sn multilayer coatings were made on LY12 aluminium substrate by plasma spray. Effect of various parameters on the melting degree and deposition efficiency of feedstock has been investigated.The surface and the interfaces morphology of the multilayer coatings were observed using scanning electron microscopy. The weight gain of the coatings was weighed using precision mechanical balance.The tensile strength of the multilayer was determinated by mechnical testing machine. The chemical composition of these coatings was seperately obtained using auger energy spectrum and chemical analysis.The result shows that Ta/W/Sn multilayer coatings with fine structure and uniform thickness could be prepared by plasma spray processes.The degree of the powders melting is much affected by spray power and spray rate, and does not vary much with spray distance within the specific range.
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