SURFACE HYDROPHILIC MODIFICATION FOR CARBON/CARBON COMPOSITES AND ITS EFFECT ON THE BONDING STRENGTH OF HYDROXYAPATITE COATING

Leilei Zhang (), Hejun Li, Qiang Song, Kezhi Li, Jinhua Lu, Wei Li, Sergey V. Mikhalovsky and Sheng Cao
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Leilei Zhang: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Hejun Li: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Qiang Song: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Kezhi Li: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Jinhua Lu: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Wei Li: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Sergey V. Mikhalovsky: School of Pharmacy and Biomolecular Sciences, University of Brighton, Lewes Road, Brighton BN2 4GJ, United Kingdom
Sheng Cao: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

Surface Review and Letters (SRL), 2014, vol. 21, issue 01, 1-9

Abstract: In order to improve the bonding strength of hydroxyapatite coating on carbon/carbon composites, a surface hydrophilic modification was performed on carbon/carbon composites using a combination ofH2O2andFeSO4⋅ 7H2Ounder ultraviolet irradiation. The hydroxyapatite coating was prepared by an ultrasound-assisted electrochemical deposition method. The results showed that the surface hydrophilic modification introduced a large number of oxygen-containing functional groups (C=O,C–OandCOOHgroup) onto the surface of carbon/carbon composites. The surface hydrophily of the modified carbon/carbon composites was significantly improved with the water contact angle decreasing from 85.7 ± 4.1° to 11.9 ± 1.5°. The modified carbon/carbon composites had strong induction ability for the deposition of hydroxyapatite crystals. The hydroxyapatite showed a wavy-shaped crystal at initial deposition process and subsequently formed a compact and uniform coating. The bonding strength of hydroxyapatite coating on modified carbon/carbon composites (9.58 ± 0.40 MPa) was significantly higher than that of the coating on unmodified carbon/carbon composites (3.04 ± 0.20 MPa).

Keywords: Carbon/carbon composites; hydroxyapatite; coating; bonding strength; surface modification (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1142/S0218625X14500164

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