Surfaces, Interfaces and Surface Analysis of MaterialsNo Access

DEVELOPMENT AND OXIDATION RESISTANCE OF PLASMA SPRAYED Mo(Si,Al)₂ COATING ON Nb_ss/Nb₅Si₃ IN SITU COMPOSITES

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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HAIXIA WEI

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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CHUNGEN ZHOU

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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https://doi.org/10.1142/S0217979210066276Cited by:0 (Source: Crossref)

Abstract

A Mo(Si,Al)₂ coating is developed to protect Nb_ss/Nb₅Si₃ in situ composite by plasma spraying. The binary layers of this coating consist of an inner interdiffusion layer surrounded by Mo(Si,Al)₂ layer with C40 crystal structure. After oxidation at 1250°C for 100h, Mo(Si,Al)₂ coating exhibited an excellent protection against oxidation and good adherence to substrate. The oxidation curve followed parabolic law and even after oxidation at high temperature for 100h, the weight gain per unit area of Mo(Si,Al)₂ coating is 8.24mg/cm². No evident spalling of coating to substrate was observed but a continuous and compact layer of Al₂O₃ was formed on coating surface to prevent oxidation below coating and substrate.

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