抄録
Marine coral consisting of calcium carbonate is known as bioresorbable ceramics. In the present study, condition to prepare bulk calcium carbonate by carbonization of calcium hydroxide compact was studied. Compacted calcium hydroxide was placed in a vessel at 100% relative humidity under the flow carbon dioxide. We found calcium hydroxide compact gradually transformed to calcium carbonate, calcite, with time. However, some calcium hydroxide remain unreacted even after 72 hours when the molding pressure was 20kg/cm2 or higher. Diametral tensile strength (DTS) of the calcium carbonate increased with increasing in the molding pressure. For example, DTS value of the calcium carbonate compact was approximately 5 MPa when the compact was made under the molding pressure of 50kg/cm2. We concluded therefore that regulation of molding pressure is important to obtain pure calcium carbonate compact.
