Abstract
Dihydrate (CaHPO4⋅2H2O; DCPD) and anhydride (CaHPO4; DCPA) of dicalcium phosphate are studied on their hydraulicity (hydration and hardening) induced by the addition of CaCO3 and properties of the resulting porous apatite. The hardening was caused by the entanglement of microcrystals of reaction products, i.e., carbonate-containing apatite and/or octacalcium phosphate. DCPD is hydrated and hardens more easily than DCPA. The addition of F- accelerates the hydration reaction remarkably, however no hardening occurs. The resulting hardened apatite bodies have 70-80% porosity and a diametral tensile strength of 0.3-1.5MPa. Sintered apatite bodies prepared by heating the hardened bodies are densified to 45-60% and strengthened to 0.7-4.8MPa. An apatite packed column for HPLC (high-performance liquid chromatography) prepared by using the hydraulicity has a high flow rate (1.39ml/min·cm2 at pressures of 1-2kgf/cm2), but it shows a low resolution producing chromatographic peaks with a large width; this is probably due to a heterogeneous packing structure.
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