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Plasma-spraying methods for applications in the production of quality biomaterials for modern medicine and dentistry♣

B. GUEORGUIEV1,* , I. IORDANOVA2, C. M. SPRECHER1, H. SKULEV3, D. WAHL1, A. HRISTOV2

Affiliation

  1. AO Research Institute, Clavadelerstrasse 8, 7270 Davos, Switzerland
  2. Department of Solid State Physics and Microelectronics, Faculty of Physics, University of Sofia, 5 blvd. James Bouchier, 1164 Sofia, Bulgaria
  3. Technical University of Varna, 9010 Varna, Bulgaria

Abstract

Bioceramic hydroxylapatite (HA) coatings have been shown to be promising bioactive properties in load-bearing implant applications. Biocompatible heterostructure HA/TiO2 deposits, consisting of a TiO2 transition layer (100µm) and a HA top layer (20 and 40µm) were applied on Ti-6Al-4V (TAV) substrates, using atmospheric plasma-spraying (APS). The microstructure parameters were analysed by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The bond strength was evaluated with a tensile test for thermally sprayed coatings (ASTM C633-79). The results revealed that all deposits have a relatively dense and homogeneous, predominantly polycrystalline, microstructure. In addition, a negligible amount of an amorphous-like HA phase, formed mainly in the near-surface regions, and an insignificant amount of partially molten spherical grains are also presented. A not well pronounced crystallographic texture was detected. Compressive residual stresses in the range 7-10GPa, acting parallel to the top surface and decreasing during the growth, were registered. The HA/TiO2 interface, about 15µm wide, was diffuse in nature and enabled a smooth transition between the two layers. The evaluated tensile bond strength was sufficiently high, and varied between 49 and 53MPa..

Keywords

Thin films and coatings, Crystallographic structure, Interface, XRD, SEM.

Submitted at: Nov. 5, 2008
Accepted at: Sept. 9, 2009

Citation

B. GUEORGUIEV, I. IORDANOVA, C. M. SPRECHER, H. SKULEV, D. WAHL, A. HRISTOV, Plasma-spraying methods for applications in the production of quality biomaterials for modern medicine and dentistry♣, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 9, pp. 1331-1334 (2009)