Abstract
Hydroxyapatite (HAp) ceramics were prepared by hydrothermal hot pressing (HHP) processes through the reaction between octacalcium phosphate (OCP) and ammonia water, at 300℃. When the amount of ammonia was over the chemical stechiometric ratio, pure HAp ceramics was obtained. The high concentration of ammonia water was advantageous for the solidification of the HAp ceramics. The appropriate amount of water improved the toughness, but greatly reduced the tensile strength. With addition of 10% high concentration ammonia water, HAp ceramic was achieved at 300℃ by HHP method. The density, fracture toughness, and tensile strength of the ceramics reached 2.82g/cm^3, 1.07MPam^<1/2>, and 18.2MPa, respectively. The present study demonstrated that the HHP method was a useful method for preparing HAp ceramics at low temperature.
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