|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||008 Effect of Crystallinity on Dissolution Properties of Plasma Sprayed Hydroxyapatite Coatings
||Mangal Roy, Amit Bandyopadhyay, Susmita Bose
|On-Site Speaker (Planned)
Plasma sprayed hydroxyapatite (HA) coatings are widely used in load bearing orthopaedic implants. The physical and mechanical stability of these coatings are dependent on the dissolution properties in physiological conditions. In this presentation we will discuss about the effect of crystallinity on the stability of induction plasma sprayed nano HA coatings. A 30 kW plasma spray system, equipped with supersonic nozzle, was used to prepare HA coating with different crystallinity. Dissolution experiments were performed at pH 5.5 and pH 7.4 buffered media for 32 days at 36.5± 0.5 °C with shaking at 150 rpm. The dissolution media was analyzed for Ca2+ concentration. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and adhesive bond strength test were used to study the structural, phase and mechanical property changes due to dissolution. Coatings with different crystallinity, in general, gained weight at pH 7.4 and lost weight at pH 5.5.