硅化物涂层电子束重熔表面改性技术

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，电子束重熔提高了硅化物涂层的抗氧化性能和抗热震性能。

Application of Electron Beam Modification Technique on Silicide Coatings

The silicide coating was prepared by fused slurry method with Nb521 alloy and re-meltedby using high frequency electron beam. The morphology of specimen was analyzed by SEM and surface profiles equipment. It shows that, after electron beam re-melt process, the surface ceramic grain granularity and surface roughness decrease, the sintering effects between ceramic grains increase, and the obvious boundary appears between primary region and re-melted region. It proves that the energy distributing is well-proportioned, the high temperature oxidation resistance and shock testing validate capability are improved after electron beam re melting process.