Abstract
Hydroxyapatite (HAp) ceramics have been prepared from α‐tricalcium phosphate (α‐TCP) with addition of water or ammonia water by hydrothermal hot‐pressing (HHP) method under a condition of 300°C/40 MPa/2 h. When the additive is water, it appears that the HAp grains produced show whisker‐like and plate‐like features. The bending strength of the HAp ceramic obtained is measured to be 24.5 MPa. When the additive is ammonia water, the obtained HAp ceramic consists of HAp‐whiskers only. The bending strength and fracture toughness reach 56 MPa and 1.52 MPa·m1/2, respectively. Treating α‐TCP with addition of ammonia water by the HHP method is thus a useful method for in situ fabrication of HAp‐whisker ceramics.
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