2004 年 17 巻 p. 240-245
Calcium hydroxyapatite, Ca10(PO4)6(OH)2: HA, is the inorganic principle component of natural bones and teeth, The present study deals with the preparation of HA ceramics with a different OH amount by spark plasma sintering (SPS) from HA fine crystals synthesized hydrothermally. The dense hydroxyapatite ceramics with controlled OH were prepared at the temperatures from 800°C to 1000 °C for 10 min. Transparent hydroxyapatite ceramics were prepared by SPS at 900 °C and 1000 °C. The amount of OH ion in the structure of hydroxyapatite was decreased with increasing temperature of sintering. The hydrothermally treated HA fine crystals have the high sinterability.
