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| Study on the microstructure and high-temperature oxidation resistance of
bentonite modified MoSi2-based composite coatings |
| ZHU Lu1，YIN Jinnan2，FENG Peizhong1 |
| （1. School of Materials and Physics，China University of Mining and Technology，Xuzhou 221116，China; 2. Air
Force 93147 Chinese People’s Liberation Army，Chengdu 610000，China） |
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Abstract The microstructural evolution and high-temperature oxidation behavior of bentonite modified MoSi2
composite coating prepared by spark plasma sintering were studied. The results show that the composite coating is
mainly composed of MoSi2 phase and a small amount of Mo5Si3 phase, and the addition of bentonite reduces the
CTE mismatch between the coating and substrate, thus the composite coating presents a crack-free morphology.
During oxidation at 1 500 ℃, the composite coating maintains slow mass gain since a dense and complete layer of
SiO
2 forms on the surface during the oxidation process, which inhibits the high-temperature diffusion of oxygen
and effectively avoids the further oxidation inside the coating. Compared with single MoSi2 coating, the oxide scale
of the bentonite modified composite coating is thinner with a crack-free morphology, therefore showing relatively
better high-temperature oxidation resistance
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Received: 29 March 2022
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Corresponding Authors:
冯培忠（1976—），男，博士，教授，博士生导师，主要研究方向为燃烧合成技术、高温结构硅化物与高温涂层、固体废弃物回收利用等。
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2023, Vol. 33 
