Calcium phosphate thin film processing by pulsed laser deposition and in situ assisted ultraviolet pulsed laser deposition.

摘要: Calcium orthophosphates (CaP) and hydroxyapatite (HA) were intensively studied in order to design develop a new generation of bioactive osteoconductive bone prostheses. The main drawback now the CaP HA thin films processing persists their poor mechanical characteristics, namely hardness, tensile cohesive strength, adherence metallic substrate. We report here critical comparison between microstructure properties grown by two methods. KrF* pulsed laser deposition (PLD) or assisted situ ultraviolet radiation emitted low pressure Hg lamp (UV-assisted PLD). PLD deposited at room temperature, vacuum on Ti–5Al–2.5Fe alloy substrate previously coated with TiN buffer layer. After annealed ambient air 500–600 °C. UV-assisted (10−2–10−1 Pa) oxygen directly substrates heated classical are crystalline stoichiometric. exhibit best characteristics values hardness Young modulus 6–7 150–170 GPa, respectively, which unusually high for calcium phosphate ceramics. To difference films, case PLD, GIXRD spectra show decomposition Ca2P2O7, Ca2P2O9 CaO. UV enhanced gas reactivity atoms mobility during processing, increasing strength film, while structure was destroyed.