Powder Mixture for the Production of Microporous Ceramics Based on Hydroxyapatite

Powder mixtures with a given molar ratio of Ca/P = 1.67 were prepared under mechanical activation conditions from hydroxyapatite powder Ca10(PO4)6(OH)2 and 1M aqueous solution oxalic acid H2C2O4 at Ca10(PO4)6(OH)2/H2C2O4 1:4. The phase composition obtained mixture included brushite (calcium hydrophosphate dihydrate) CaHPO4·2H2O, calcium oxalate monohydrate CaC2O4·H2O in form whewellite weddellite, some quantity quasi-amorphous phase. This was used to produce microporous monophase ceramics based on apparent density 1.25 g/cm3 after firing 1200 °C. Microporosity sintered formed due the presence particles plate-like morphology, restraining shrinkage during sintering. Microporous roughness surface as consequence created microporosity can be recommended biocompatible material for bone defects treatment substrate cell cultivation.