Synthesis and characterisation of β-tricalcium phosphate coating on zirconia toughened alumina by biomimetic method. (April 2013)

• Record Type: Journal Article
• Authors: Esfahani, H; Nemati, A; Salahi, E
• Is Part Of: Advances in applied ceramics. Volume 112:Number 3(2013)
• Page Start: 140
• Page End: 145
• Publication Date: 2013-04
• Subjects: Calcium deficient hydroxyapatite -- Biomimetic -- β-TCP -- Growth -- Nucleation -- Sodium silicate -- Zirconia toughened alumina; Ceramics -- Periodicals; 620.1405
• DOI: 10.1179/1743676112Y.0000000062
• Languages: English
• ISSNs: 1743-6753

Abstract

Abstract : Abstract: The present work studied bioactive coatings on the surface of ceramic biomaterials. Zirconia toughened alumina (ZTA) composites containing 15 mol.-%. Partially stabilised zirconia was prepared after 1 h sintering at 1550°C. Apatite layers were then coated onto the surfaces of composites by the biomimetic method using 1·5–2 multiply concentrations of simulated body fluid (SBF). Before treatment in SBFs, a sodium silicate layer was employed as nucleating agent to induce the formation of a calcium phosphate layer. The effect of immersion time on the morphology of the precipitate was monitored with a scanning electron microscope. X dot maps revealed that there is a relationship between distribution of Ca–P and ZTA surface. X-ray diffractometry patterns, calcium/phosphor molar ratio and Fourier transform infrared spectroscopy showed that β -tricalcium phosphate and calcium deficient hydroxyapatite precipitated onto substrates via biomimetic. The thin film X-ray diffraction pattern showed that the calcium deficient hydroxyapatite decomposed into β -tricalcium phosphate and CaO after 0·5 h of heat treatment at 700°C.