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在铜基体上利用等离子体喷涂技术制备了钨涂层面对等离子体材料,分析了喷涂功率对涂层致密性、传热性能、表面粗糙度等性能的影响,利用Nd∶YAG激光器对等离子体喷涂钨涂层瞬态高热负荷作用下的损伤行为进行研究。研究发现,瞬态高热负荷仅在涂层表面传递,涂层破坏主要发生在表面,涂层内部没出现明显损伤。损伤演变行为是:表面局部熔化、微裂纹形成,熔区扩展并向外挤压熔化的钨涂层、主次裂纹出现,涂层加热区沸腾并伴随蒸发、溅射现象。
The plasma of tungsten coating was prepared on the copper substrate by plasma spray technique. The influence of spray power on the properties of coating such as compactness, heat transfer and surface roughness was analyzed. The effects of plasma spraying on the plasma The damage behavior of tungsten coating under transient high heat load was studied. The study found that the transient high heat load transfer only on the coating surface, coating damage occurs mainly in the surface, no significant damage inside the coating. Damage evolution is: local surface melting, micro-crack formation, the melting zone expansion and outward extrusion of the molten tungsten coating, primary and secondary cracks appear, the coating heating zone boiling and accompanied by evaporation, sputtering phenomenon.