Microstructure and Oxidation Behavior of Molybdenum Disilicide Coating Prepared by Air Plasma Sprayed

Abstract:

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.

• Periodical: Materials Science Forum (Volume 686)
• Pages: 583-588
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.686.583
• Online since: June 2011
• Authors: Jian Hui Yan, Si Wen Tang, Jian Guang Xu
• Keywords: Air Plasma Sprayed, Microstructure, Molybdenum Disilicide, Oxidation

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DOI: 10.1016/s0257-8972(01)01364-0

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