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在金属钼表面制备了Mo-C-N-Si涂层,研究了涂层在1600℃大气环境下的氧化特性,采用SEM和XRD分析了涂层的微观结构和物相组成。结果表明:Mo-C-N-Si涂层以MoSi2为主相,SiC和Si3N4为次相,存在Mo2C+MoxN中间层;由于扩散和氧化反应,涂层在氧化初期形成SiO2氧化膜层、MoSi2主体层、Mo5Si3层和Mo2C+MoxN层等四层结构,氧化后期转变为Mo2C+MoxN层和Mo3Si+Mo5Si3层的双层结构,导致涂层失效。由于C、N的引入,涂层抗热震性能良好。
The Mo-C-N-Si coating was prepared on the surface of molybdenum metal. The oxidation characteristics of the coating at 1600 ℃ were studied. The microstructure and phase composition of the coating were analyzed by SEM and XRD. The results show that MoSi2 is the main phase of Mo-CN-Si coating and the secondary phase of SiC and Si3N4 are Mo2C + MoxN intermediate layer. Due to the diffusion and oxidation reaction, the SiO2 oxide film layer and MoSi2 host layer , Mo5Si3 layer and Mo2C + MoxN layer. After the oxidation, the double layer structure of Mo2C + MoxN layer and Mo3Si + Mo5Si3 layer is oxidized, resulting in failure of the coating. Due to the introduction of C, N, the thermal shock resistance of the coating is good.