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通过观察硅化物涂层表面、断面微观形貌和EDS分析,分析了航天发动机用铌钨合金高温抗氧化涂层表面堆积的形成机理及其对涂层性能的影响。研究发现,料浆熔烧法制备的涂层有点堆积和线堆积两种,点堆积是由于涂层碎屑污染料浆产生,并不改变涂层的结构和成分,对涂层整体性能影响不大;在熔烧过程中由于涂层脱落会形成线堆积,引起涂层厚度波动,且伴生有漏涂现象,使涂层性能急剧下降,漏涂处迅速损坏。
By observing the surface, microstructure and EDS analysis of the silicide coating, the formation mechanism of the surface anti-oxidation coating on the niobium-tungsten alloy for aerospace engine and its effect on the coating performance were analyzed. It is found that the slurry prepared by the slurry melting method has a little accumulation and line accumulation. The point accumulation is caused by the fact that the coating debris pollutes the slurry, does not change the structure and composition of the coating, and has no influence on the overall coating performance Large; in the melting process due to the coating off will form a line of accumulation, causing the coating thickness fluctuations, and associated with leakage phenomenon, the coating performance dropped sharply, leakage coating Department of rapid damage.