Regeneration of HA Coating on Porous ZrO2 Gradient Bioceramics

ABSTRACT Themal decomposition and poor mechanical strength of hydroxyapatite (HA) restrict its further application in the field of bone tissue engineering. A porous HA/ZrO2 gradient bioceramics with regenerated HA coating was thus designed. Its porosity reached about 70% with its compressive strength reaching about 14 MPa. The porosity and mechanical strength were balanced appropriately by immersing the bioceramics for three times using slurry concentrations of 60%, 55% and 50%, respectively. Through analyzing the decomposition and regeneration behaviour of HA by DSC, Raman and XRD, 4 mol mass of NaHCO3 heated at 900°C for 2 h was the optimum condition for regenerating HA coating. The regeneration effect and process were also discussed. GRAPHICAL ABSTRACT

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