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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 6    No. 4    December 1996

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MICROSTRUCTURE OF INTERFACE BETWEEN HVOF SPRAYED WC-Co COATING AND SPRING STEEL SUBSTRATE
Shao Beiling, Liu Ansheng, Wang Xiaohua, Li Yonghong, Zou Linying, Wang Jing, Zhang Jianguo, Shi Changyong, Zhou Yiru

General Research Institute For Nonferrous Metals, Beijing100088

Abstract:The microstructure of the interface between the high velocity oxygen-fuel flame (HVOF) sprayed WC-Co coating and spring steel substrate was characterized by electron microscopy. The WC particles embedded in the adheringγphase of nanometer crystallites were observed in the WC-Co coating. A 2μm thick diffusive layer of tungsten atoms is present in the spring steel substrate, which implies that atomic movements between the ceramic coating and the metal substrate occur during the HVOF spraying and that may be the main reason of excellent bond between the HVOF sprayed WC-Co coating and the spring steel substrate.

 

Key words: high velocity oxygen-fuel flame spraying microstructure interface

ISSN 1672-7029
CN 43-1423/U

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