Comparative investigations of structure and properties of micro-arc wollastonite-calcium phosphate coatings on titanium and zirconium-niobium alloy

M B Sedelnikova; E G Komarova; Yu P Sharkeev; T V Tolkacheva; I A Khlusov; L S Litvinova; K A Yurova; V V Shupletsova

doi:10.1016/j.bioactmat.2017.01.002

Comparative investigations of structure and properties of micro-arc wollastonite-calcium phosphate coatings on titanium and zirconium-niobium alloy

Bioact Mater. 2017 Feb 13;2(3):177-184. doi: 10.1016/j.bioactmat.2017.01.002. eCollection 2017 Sep.

Authors

M B Sedelnikova¹, E G Komarova¹, Yu P Sharkeev^{1

2}, T V Tolkacheva¹, I A Khlusov^{2

3

4}, L S Litvinova⁴, K A Yurova⁴, V V Shupletsova⁴

Affiliations

¹ Institute of Strength Physics and Materials Science of SB RAS, Academicheskii pr., 2/4, 634055, Tomsk, Russia.
² National Research Tomsk Polytechnic University, Lenina pr., 30, 634050, Tomsk, Russia.
³ Siberian State Medical University, 2 Moskovsky tr., 634050, Tomsk, Russia.
⁴ Immanuel Kant Baltic Federal University, 14 A. Nevskogo st., 236041, Kaliningrad, Russia.

Abstract

Investigation results of micro-arc wollastonite-calcium phosphate (W-CaP) biocoatings on the pure titanium (Ti) and Zr-1wt.%Nb (Zr-1Nb) alloy were presented. The voltages of 150-300 V generate the micro-arc oxidation (MAO) process with the initial amplitude current of 150-550 A and 100-350 A for Ti and Zr-1Nb substrates, respectively. The identical dependencies of changes of the coating thickness, surface roughness and adhesion strength on the process voltage were revealed for the both substrates. The W-CaP coatings with the thickness of 10-11 μm were formed on Ti and Zr-1Nb under the low process voltage of 130-150 V. Elongated wollastonite particles with the size in the range of 40-100 μm were observed in such coatings. The structure of the coatings on Ti was presented by the X-ray amorphous and crystalline phases. The X-ray reflexes relating to the crystalline phases of Ti and wollastonite were observed only in XRD patterns of the coatings deposited under 130-200 V on Ti. While, the crystalline structure with phases of CaZr₄(PO₄)₆, β-ZrP₂O₇, ZrO₂, and Zr was detected in the coatings on Zr-1Nb. FT-IRS, XRD, SEM, and TEM data confirmed that the increase of the process voltage to 300 V leads to the dissociation of the wollastonite. No toxic effect of specimens on a viability, morphology and motility of human adipose-derived multipotent mesenchymal stem cells was revealed in vitro.

Keywords: Biocoatings; Calcium phosphate; Micro-arc oxidation; Wollastonite.