【摘要】 采用复合包渗法在C103铌合金基体上制备硅化物涂层,进行1500℃静态氧化实验,室温～1500℃热震实验,利用X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)等检测手段对涂层氧化前后的组织结构进行观察,分析涂层形成机理、硅化时间对涂层组织结构的影响以及涂层氧化前后组织形貌的变化。研究表明,复合包渗法制备硅化物涂层主要是通过扩散反应形成的;涂层是以MoSi2相为主体层的多相复合结构;在高温氧化环境下,涂层表面生成熔融态非晶玻璃膜,有效阻止了氧向内进一步扩散,涂层抗静态氧化及抗热震性能良好。更多还原

【Abstract】 The silicide coatings on C103 niobium alloy were prepared by complex packing cementation.Microstructure of coatings before and after oxidation was analyzed by means of XRD,SEM and EDS.Tie results show that the silicide coatings prepared by pack cementation are formed by reactive diffusion;the coatings are multi structures with MoSi2 as main layer;at the high temperature oxidation circumstance,the dense amorphous glass scale is formed on the silicide coating,which imped the process of the oxygen diffusion to inner layer,thus coatings represent good high-temperature oxidation and thermal shock resistance.更多还原