Coatings of hydroxyapatite - nanosize alpha alumina composites on Ti-6Al-4V

Evis Z., Doremus R.

MATERIALS LETTERS, vol.59, pp.3824-3827, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 59
  • Publication Date: 2005
  • Doi Number: 10.1016/j.matlet.2005.07.020
  • Journal Name: MATERIALS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3824-3827
  • Keywords: hydroxyapatite, nanosize alpha alumina, coating, XRD, MECHANICAL-PROPERTIES, HYDROXYLAPATITE
  • Middle East Technical University Affiliated: Yes

Abstract

Composites of hydroxyapatite (HA) and nanosize-alpha-(alpha)-Al2O3 with 5 wt.% CaF2 were coated on Ti-6Al-4V rods by cold pressing and sintered in air or argon atmosphere at 1100 degrees C to improve the bonding between the metal and the ceramic. 25 and 40 wt.% alpha-Al2O3-5 wt.% CaF2-HA composites gave the best results of strong bonding. 25 wt.% alpha-Al2O3-5 wt.% CaF2-HA and Ti-6Al-4V showed the same thermal expansion coefficients. The thermal expansion coefficient of the 40 wt.% alpha-Al2O3-5 wt.% CaF2-HA composite was slightly smaller than that of Ti-6Al-4V, which created a compressive stress on the coating, resulting in improved bonding between the metal and the ceramic. (C) 2005 Elsevier B.V. All rights reserved.