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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Influence of processing parameters and heat treatment on phase composition and microstructure of plasma sprayed hydroxyapatite coatings
ZHAO Guo-liang(赵国亮)1, WEN Guang-wu(温广武)1, WU Kun(吴 昆)2

1. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:Air plasma spraying process was employed to fabricate various hydroxyapatite(HA) coatings on titanium substrates. The influence of processing parameters on the phase composition and the microstructure of the obtained coatings was investigated. The effect of heat treatment on as-sprayed coating in terms of the crystallinity and microstructure was also studied. The phase composition of coatings was analyzed by X-ray diffraction(XRD) and FTIR. The surface and cross-section morphologies and microstructure of coatings as well as the morphology of feedstock were evaluated using scanning electron microscope(SEM). The crystallization temperature of amorphous HA phase in as-sprayed coating was examined by using differential thermal analysis(DTA). The results suggest that phase composition and microstructure of as-sprayed HA coatings strongly depend on the spraying  parameters, and heat treatment at 760 ℃ for 2 h is one of effective means for increasing the crystallinity and improvement in microstructure of as-sprayed HA coatings.

 

Key words: hydroxyapatite coatings; plasma spraying; processing parameters; heat treatment

ISSN 1672-7029
CN 43-1423/U

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