Ceramics based on hydroxyapatite synthesized from calcium chloride and potassium hydrophosphate

The properties of powdered hydroxyapatite (HAP) synthesized from calcium chloride and potassium hydrophosphate are investigated. The powder material consists of HAP and an secondary product of the reaction, which is predominately KCl. After sintering at a temperature above 800°C, the ceramic contains HAP as the main phase as well as CaO and chloroapatite. The maximum density (2.2 g/cm 3 ) and the smallest grain size (200-500 nm) are observed in material after sintering at 700°C.