电子束重熔处理对硅化物涂层表面形貌和性能的影响

在Nb521铌合金表面采用料浆烧结法制备硅化物涂层，利用高频扫描电子束对硅化物涂层进行重熔处理，通过扫描电子显微镜对处理样品表面形貌进行组织结构分析。研究表明，经过电子束重熔处理，硅化物涂层表面陶瓷晶粒粒度降低，表面粗糙度降低，陶瓷颗粒之间烧结作用增强，重熔区域与未处理区域具有明显的边界，电子束能量分布较均匀。电子束重熔增强了陶瓷涂层的烧结作用，涂层致密度增加，硅化物层的抗氧化性能和抗热震性能提高。

EFFECT OF ELECTRON BEAM RE-MELTING ON SURFACE MOTPHOLOGY AND PROPERTIES OF SILICIDE COATING

The silicide coating was prepared by fused slurry method on Nb521 alloy, the silicide coating was re-mehed by high frequency electron beam, the morphology of specimen was analyzed by SEM. It is found that after electron beam re-melt process, the surface ceramic grain granularity and surface roughness decrease, the sintering effect between ceramic grains increased, the obvious boundary was found between primary region and region re-melted, it prove that the energy distributing is well-proportioned. The silicide coating＂ sintering effect increased after EB re-melting process, and the coating became dense, the surface roughness of coating decrease, the high-temperature oxidation resistance and shock testing validate capability improved.