采用等离子喷涂-物理气相沉积(PS-PVD)在高温合金基体上沉积7YSZ热障涂层,通过分步沉积实验、径向和轴向的涂层结构分布实验探讨了涂层中各种粒子的种类、形成原因、对涂层结构的影响及射流中的粒子分布.研究表明:PS-PVD实际上是一种以气相沉积为主,多相混合的沉积方式.涂层的沉积过程中,气相沉积是柱状晶形成的主要原因;熔融及部分熔融的大颗粒对可以直接改变柱状结构的生长状态;气相再凝固和气化不充分残留的小颗粒对涂层的影响是一个累积的过程.气相主要集中在射流中心,越靠近射流边缘,部分熔融粒子的比例越高,最终导致PS-PVD沉积涂层结构出现空间分布特征.
7YSZ coatings were prepared by plasma spray-physical vapor deposition (PS-PVD) technique based on the differential step deposition,the radial and axial distributing experiments.The species and formation,their effect on the coating structure and performance,and the distribution in the jet of different particles in the coatings were studied.The results show that the actual PS-PVD process is a deposition method of mixed gas/liquid/solid phase,which is mainly gas-phase deposition.Gas phase is the primary cause for the formation of columns crystal.Large particles (droplet or partial-molten particles) could easily interfere with their growth.The accumulation of small particles (remains or re-solidified ones) also has influence on the coating structure,while it changes relatively slowly.Most gas phase distributes in the center of plasma jet.Away from the center,the proportion of partial-molten particles increases with the radius.The state and distribution of particles in jet result in the regional characteristic of 7YSZ coatings.
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