Microstructure and Oxidation Behavior of Molybdenum Disilicide Coating Prepared by Air Plasma Sprayed
Microstructure and Oxidation Behavior of Molybdenum Disilicide Coating Prepared by Air Plasma Sprayed
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DOI：
10.4028/www.scientific.net/msf.686.583
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发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
Jian-hui Yan;Si-wen Tang;J. Xu
中科院分区：
文献类型：
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作者：
Jian-hui Yan;Si-wen Tang;J. Xu
金属间化合物钼在高温下作为飞机发动机和燃气轮机的保护涂层具有巨大的潜力。采用喷雾干燥法和真空烧结工艺制备了适合等离子喷涂的MoSi2粉末。涂层的氧化行为在 1200 °C 下测定。通过 XRD、SEM 和 EDS 对喷涂和氧化后的涂层进行了表征。结果表明，烧结处理后的MoSi2粉末的流动性和松装密度分别为17.1 s/50g和2.1g/cm3，非常适合空气等离子喷涂。在喷涂过程中，部分四方晶格的二硅化钼转化为六方晶格的二硅化钼。另外，部分MoSi2相被氧化并转变为Mo5Si3相。采用空气等离子喷涂制备了相对致密的二硅化钼涂层。 MoSi2涂层在1200℃氧化200 h时，MoSi2涂层表面形成一层厚度约为10 μm的玻璃状保护层SiO2。氧化试验结果表明，空气等离子喷涂制备的MoSi2涂层可以为高温结构材料提供保护层。
Intermetallics molybdenum dislicied has a great potential as a protective coating in aircraft engines and gas turbines in the elevated temperature. The suit for plasma spraying MoSi2 powders were prepared by spray drying process and vacuum sintered. The oxidation behaviors of the coating were determined at 1200 °C. The coatings as sprayed and oxidized were characterized by XRD, SEM and EDS. Results show that the flow ability and loose density of MoSi2 powder by sintered treatment, were 17.1 s/50g and 2.1g/cm3, respectively, ideal for air plasma spraying. During the course of spraying, some of molybdenum disilicide with a tetragonal lattice was converted into molybdenum disilicide with a hexagonal lattice. Also, part of MoSi2 phase oxidized and transformed to Mo5Si3 phase. A relative dense molybdenum disilicide coating was prepared by air plasma spraying. A protective SiO2 layer, seems to be glassy, with a thickness about 10 μm was formed on the surface of MoSi2 coating during MoSi2 coating oxidized at 1200°C for 200 h. The results of the oxidation tests show that MoSi2 coating prepared by air plasma spraying may be provide a protect layer for high temperature structure material.