Dense hydroxyapatite (HAp) ceramics with a porous layer were prepared from two types of HAp powders with different sinterability. The ceramics were prepared by post-sintering by HIP at 1000°C under 200 MPa of Ar for 1 h without any capsules, and after normal sintering in air at 1050°C for 3 h. The HAp powders with high sinterability synthesized hydrothermally provided the dense layer of the ceramics and the commercial HAp coarse powders with lower sinterability provided the porous layer. The dense layer showed transparency with over 99.9% relative density with a median grain size of 0.54 μm, while the porous layer of the ceramics showed about 43% porosity with a pore size of 1 to 10 μm.
|Number of pages||5|
|Journal||Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan|
|Publication status||Published - 1989 Dec 1|
ASJC Scopus subject areas
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry