EFFECT OF HYDROTHERMAL TREATMENT ON PREPARATION OF TRANSPARENT APATITE CERAMICS BY SPARK PLASMA SINTERING

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 •Ž and 1000 •Ž. The amount of OH ion in the structure ot hydroxyapatite was decreased witn increasing temperature or sintering. The hydrothermally treated HA fine crystals have the high sinterability. (Received June 30, 2004; Accepted August 27, 2004)

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