Surface hydrophilic modification for carbon/carbon composites and its effect on the bonding strength of hydroxyapatite coating

Zhang Leilei, Li Hejun, Song Qiang, Li Kezhi, Lu Jinhua, Li Wei, Sergey V. Mikhalovsky, Cao Sheng

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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 of H2O2 and FeSO4 · 7H2O under 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-O and COOH group) 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).

Original languageEnglish
Article number1450016
JournalSurface Review and Letters
Volume21
Issue number1
DOIs
Publication statusPublished - Feb 1 2014

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Keywords

  • Carbon/carbon composites
  • bonding strength
  • coating
  • hydroxyapatite
  • surface modification

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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