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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 1    January 2008

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Preparation and mechanism of calcium phosphate coatings on chemical modified carbon fibers by biomineralization
HUANG Su-ping(黄苏萍), ZHOU Ke-chao(周科朝), LI Zhi-you(李志友)

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract: In order to prepare HA coatings on the carbon fibers, chemical modification and biomineralization processes were applied. The phase components, morphologies, and possible growth mechanism of calcium phosphate were studied by infrared spectroscopy(IR), X-ray diffractometry(XRD) and scanning electron microscopy(SEM). The results show that calcium phosphate coating on carbon fibers can be obtained by biomineralization. But the phase components and morphologies of calcium phosphate coatings are different due to different modification methods. Plate-like CaHPO4∙2H2O (DCPD) crystals grow from one site of the active centre by HNO3 treatment. While on the para-aminobenzoic acid treated fibers, the coating is composed of nano-structural HA crystal homogeneously. This is because the —COOH functional groups of para-aminobenzoic acid graft on fibers, with negative charge and arranged structure, accelerating the HA crystal nucleation and crystallization on the carbon fibers.

 

Key words: calcium phosphate coating; carbon fibers; chemical modification; biomineralization

ISSN 1672-7029
CN 43-1423/U

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