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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 6    December 2009

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Oxidation behavior of Fe40Al-xWC composite coatings obtained by high-velocity oxygen fuel thermal spray
XIANG Jun-huai(向军淮)1, 2, 3, ZHU Xing-he(朱星河)1, CHEN Gang(陈 钢)1,
DUAN Zhi(段 智)1, LIN Yan(林 彦) 2, LIU Ying(刘 莹)

1. Jiangxi Hengda Hi-tech Co. Ltd, Nanchang 330000, China;
2. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University,
Nanchang 330013, China;
3. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China

Abstract:The Fe40Al-xWC (x=0, 10, 12, 15) coatings with dense structure were successfully deposited by high-velocity oxygen fuel (HVOF) spraying of a mixture of Fe, Al and WC powders. The objective of the present work is to provide insight into the oxidation behavior of the as-deposited coatings at 650 ℃ under 0.1 MPa flowing pure O2. The present results show differences in the oxidation behavior of Fe40Al coating and Fe40Al-xWC composite coatings. The irregular Fe2O3 layer is seen on the top surface of the composite coatings. Fe40Al coating and Fe40Al-15WC composite coating both suffer a catastrophic corrosion due to the formation of a porous structure during 24 h of oxidation. However, Fe40Al-10WC and Fe40Al-12WC composite coatings show a good oxidation resistance behavior due to their dense structure.

 

Key words: Fe40Al; WC; HVOF; composite coatings; oxidation

ISSN 1672-7029
CN 43-1423/U

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