钼表面不同Al含量Mo(Si,Al)2涂层的制备及氧化膜结构

材料热处理学报, 2016, 37(12): 154-159.

钼表面不同Al含量Mo(Si,Al)2涂层的制备及氧化膜结构

王甜甜 ^1, , 田晓东 ^2, , 李梅 ^3, , 朱施荣 ^4,

1.长安大学材料学院,陕西西安,710064

2.长安大学材料学院,陕西西安,710064

3.长安大学材料学院,陕西西安,710064

4.长安大学材料学院,陕西西安,710064

基金项目: 西安市科技计划项目(No.CXY1512(8)),长安大学中央高校基本科研业务费资助项目(No.310831161012)

关键词： Mo(Si,Al)2涂层 , 组织 , 氧化 , 氧化膜结构

Preparation and oxidation film structure of the Mo(Si, Al)2 coatings containing different contents of Al on Mo

Keywords： Mo (Si, Al)2 coatings , microstructure , oxidation , oxidation film structure

采用16Si-xAl-4NH4 F-Bal.Al2O3(x=1,2,3,4,％,质量分数)渗剂经1200℃扩散共渗5h在Mo表面制备了不同Al含量的Mo(Si,Al)2涂层,分析了渗剂中Al含量对涂层组织及其氧化膜结构的影响.结果表明,不同渗剂所形成涂层均具有多层结构,涂层的外层均由Mo(Si,Al)2相组成;渗剂Al含量为1和2％时,涂层中间层均为Mo5(Si,Al)3相,内层则分别为固溶有少量Al的Mo或Mo3(Al,Si)相;渗剂Al含量为3和4％时,涂层中间层均由Mo5(Si,Ai)3和Mo3 Al8相组成,内层则均为Mo3(Al,Si)相.对含Al为1和4％的渗剂所制备的涂层在1250℃下氧化50 h,前者氧化膜厚度约为3μm,主要由SiO2组成;后者氧化膜厚度约为10μm,上部由Al2O3和SiO2的混合物组成,下部为Al2O3.

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