REACTIVITY OF HYDROXYAPATITE, α-TRICALCIUM PHOSPHATE AND TETRACALCIUM PHOSPHATE WITH ALUMINO-BOROSILICATE GLASS

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The present study was undertaken to evaluate the reactivity of hydroxyapatite (HA), ∂-tricalcium phosphate (∂-TCP) and tetracalcium phosphate (TTCP) with an alumino-borosilicate glass during the firing process to make their composite. These three kinds of calcium phosphates and the glass powders were mixed so that the weight ratios of the calcium phosphate to the glass became 50:50, respectively, to prepare HA-glass, ∂-TCP-glass, and TTCP-glass mixtures. The characterization results of differential scanning calorimetry, X-ray diffractometry, and Fourier transform infrared spectroscopy suggest that HA particles slightly react on their surfaces with the glass above 840°C, ∂-TCP reacts with the glass around 700°C and transforms to β-TCP, and TTCP transforms to HA around 380°C and reacts with the glass around 750°C.