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

• Published in: Materials letters Vol. 59; no. 29-30; pp. 3824 - 3827
• Main Authors: Evis, Zafer, Doremus, Robert H.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2005
• Subjects: Coating; Hydroxyapatite; Nanosize alpha alumina; XRD; Hydroxyapatite; Coating; XRD; Nanosize alpha alumina
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2005.07.020

Composites of hydroxyapatite (HA) and nanosize-alpha-(α)-Al2O3 with 5 wt.% CaF2 were coated on Ti-6Al-4V rods by cold pressing and sintered in air or argon atmosphere at 1100 °C to improve the bonding between the metal and the ceramic. 25 and 40 wt.% α-Al2O3-5 wt.% CaF2-HA composites gave the best results of strong bonding. 25 wt.% α-Al2O3-5 wt.% CaF2-HA and Ti-6Al-4V showed the same thermal expansion coefficients. The thermal expansion coefficient of the 40 wt.% α-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.