Fabrication of porous hydroxyapatite ceramics

Abstract

The objective of this research is to fabricate 3 types of porous hydroxyapatites by polymeric sponge method using natural cellulose and polyure-than foams as supporters. Hydroxyapatite, MP, TP and CHA prepared by different resources were characterized and made into slip forms which were conditional upon their rheologies. Fabrication was made by impregnating the polymeric sponge in each slip in a vacuum container. Buring out of the polymeric sponge was done prior to sintering subject to DTA studies. Sintering were carried out at 1250, 1210 and 1150 ํC for 1 hour. for MP, TP and CHA, respectively. Good porous hydroxyapatite specimens were recieved when polyurethane was used as supporter. MP containing 2.5% calcium metaphosphate as sintering aid exhibited a single phase hydroxyapatite with 36% porosity. The interconnecting pore identified by scanning electron microscope were from 440-1130 micro m. These specimens had compressive strength of 19.4+ - 0.4 MPa which was stronger than the other