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Study on Fabrication and Properties of Porous HA/SiO2 Composite Coating on Titanium Substrate

  • HUANG Zi-Yang ,
  • ZHANG Lan ,
  • LIANG Guang-Chao
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  • College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007

Received date: 2011-07-06

  Revised date: 2011-08-22

  Online published: 2011-09-26

Supported by

Project supported by the National Natural Science Foundation of China (No. 30970887).

Abstract

In order to obtain porous hydroxyapatite (HA) coating with high bonding strength to substrate, hydroxyapatite/silica/chitosan (HA/SiO2/CS) composite coatings were prepared on titanium substrate by electrophoretic deposition (EPD) in n-butylalcohol as dispersion medium and SiO2 powder as additive. And then a porous HA/SiO2 composite coating was obtained by sequentially sintering treatment. The surface morphology, chemical composition, phase composition and the bonding strength between composite coating and substrate were characterized by scanning electron microscopy (SEM), fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD) and shear strength testing experiment, respectively. The bioactivity of the porous HA/SiO2 composite coating was evaluated by immersion in simulated body fluid (SBF). The results showed that the porous HA/SiO2 composite coating with uniform cavities was obtained by sintering at 700 ℃ from the HA/SiO2/CS composite coating fabricated by EPD in suspension with 1:1:1 mass ratio of HA/SiO2/CS. The large-pore diameter was about 10~15 μm, the small-pore diameter was about 1~5 μm, and the bonding strength between composite coating and substrate was up to 25.5 MPa. The coating surface was covered totally by carbonate-apatite after immersion in SBF for 7 d. This porous HA/SiO2 composite coating exhibits a good bioactivity and high bonding strength between composite coating and substrate.

Cite this article

HUANG Zi-Yang , ZHANG Lan , LIANG Guang-Chao . Study on Fabrication and Properties of Porous HA/SiO2 Composite Coating on Titanium Substrate[J]. Acta Chimica Sinica, 2012 , 70(03) : 235 -240 . DOI: 10.6023/A1107063

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