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Effects of SiO2 substitution on wettability of laser deposited Ca-P biocoating on Ti-6Al-4V

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Abstract

Silicon (Si) substitution in the crystal structure of calcium phosphate (CaP) ceramics has proved to generate materials with improved bioactivity than their stoichiometric counterpart. In light of this, in the current work, 100 wt% hydroxyapatite (HA) precursor and 25 wt% SiO2-HA precursors were used to prepare bioactive coatings on Ti-6Al-4V substrates by a laser cladding technique. The effects of SiO2 on phase constituents, crystallite size, surface roughness, and surface energy of the CaP coatings were studied. Furthermore, on the basis of these results, the effects and roles of SiO2 substitution in HA were systematically discussed. X-ray diffraction analysis of the coated samples indicated the presence of various phases such as CaTiO3, Ca2SiO4, Ca3(PO4)2, TiO2 (Anatase), and TiO2 (Rutile). The addition of SiO2 in the HA precursor resulted in the refinement of grain size. Confocal laser microscopy characterization of the surface morphology demonstrated an improved surface roughness for samples with 25 wt% SiO2-HA precursor compared to the samples with 100 wt% HA precursor processed at 125 cm/min laser speed. The addition of SiO2 in the HA precursor resulted in the highest surface energy, increased hydrophilicity, and improved biomineralization as compared to the control (untreated Ti-6Al-4V) and the sample with 100 wt% HA as precursor. The microstructural evolution observed using a scanning electron microscopy indicated that the addition of SiO2 in the HA precursor resulted in the presence of reduced cracking across the cross-section of the bioceramic coating.

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Acknowledgments

A support to Yuling Yang during this work at the University of Tennessee by National Science Foundation of China for Young Scholars (Grant # 50801012) is highly acknowledged. Yuling Yang also thanks China Scholarship Council (CSC) and Northeastern University (NEU) for providing a financial support as visiting scholar at the University of Tennessee.

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  1. Narendra B. Dahotre

    Present address: Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

Authors and Affiliations

  1. Department of Physics, Northeastern University, Shenyang, 110004, China

    Yuling Yang

  2. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996, USA

    Yuling Yang, Sameer R. Paital & Narendra B. Dahotre

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  1. Yuling Yang
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  2. Sameer R. Paital
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Correspondence to Narendra B. Dahotre.

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Yang, Y., Paital, S.R. & Dahotre, N.B. Effects of SiO2 substitution on wettability of laser deposited Ca-P biocoating on Ti-6Al-4V. J Mater Sci: Mater Med 21, 2511–2521 (2010). https://doi.org/10.1007/s10856-010-4105-6

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