Abstract
A porous Al₂O₃ scaffold coated with tricalcium phosphate (TCP) was fabricated by replica method using polyurethane (PU) foam as a fugitive material. Successive coatings of Al₂O₃ and hydroxyapatite (HAp) were applied via dip coating onto polyurethane foam, which has a slender and well interconnected network. A porous structure was obtained after sequentially burning out the foam and then sintering at 1500℃. The HAp phase was changed to TCP phase at high temperature. The scaffold showed excellent interconnected porosity with pore sizes ranging from 300~700 μm in diameter. The inherent well interconnected structural feature of PU foam remained intact in the fabricated porous scaffold, where the PU foam material was entirely replaced by Al₂O₃ and TCP through a consecutive layering process. Thickness of the Al₂O₃ base and the TCP coating was about 7~10 μm each. The TCP coating was homogeneously dispersed on the surface of the Al₂O₃ scaffold.
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