包渗法制备硅化物涂层的结构形貌及形成机理

被引:30
作者
肖来荣
易丹青
蔡志刚
许谅亮
刘会群
黄道远
机构
[1] 中南大学材料科学与工程学院
关键词
铌合金; 包渗; 硅化物涂层; 反应扩散;
D O I
暂无
中图分类号
TG174.4 [金属表面防护技术];
学科分类号
090303 [农业农村环境保护与治理(农业环境保护)];
摘要
采用包渗法在C-103铌合金基体上制备MoSi2涂层,通过X射线衍射、扫描电镜和能谱分析等手段研究涂层表面、截面形貌以及氧化后涂层结构变化,并分析硅化过程中涂层的形成机理。研究结果表明:包渗法制备硅化物涂层是通过反应扩散形成的,硅化过程服从抛物线规律;该涂层为复合结构:MoSi2相为主体层;以NbSi2相为主、并含少量Nb5Si3相的两相为过渡区;Nb5Si3相为扩散层。在高温氧化环境下,涂层表面生成致密的非晶氧化层,有效地阻止了氧向涂层内扩散。
引用
收藏
页码:48 / 53
页数:6
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