Development and oxidation resistance of air plasma sprayed Mo-Si-Al coating on an Nbss/Nb5Si3 in situ composite |
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| Authors: | Dengzun Yao |
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| Affiliation: | Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, 37 Xueyuan Rd., Beijing 100191, China |
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| Abstract: | A Mo-Si-Al coating, which is mainly composed of Mo(Si,Al)2 and Mo5(Si,Al)3, was developed to protect a Nbss/Nb5Si3 in situ composite by air plasma spraying. After oxidation at 1250 °C, the oxidation curve followed parabolic law and even after oxidation for 100 h, the weight gain of Mo-Si-Al coating was 8.24 mg/cm2. The surface of the oxidized samples became flatter and smoother as time increased due to the formation of SiO2 glass. Moreover, the microstructure of Mo-Si-Al coating changed and a layer structured interdiffusion zone was formed at the substrate-coating interface after oxidation. |
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| Keywords: | A Intermetallics A Metal coatings C Oxidation C Selective oxidation |
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