Fabrication of Hydroxyapatite Ceramics with Interconnected Macro Porosity
Calcium phosphate bioceramics with an interconnective pore structure were produced by foaming of hydroxyapatite and methyl phenyl poly(silsequioxane) melts in the temperature range between 250 °C and 310 °C. The cellular structure of the resulting porous bodies were controlled by foaming parameters and filler load. A porosity of up to 92 % was achieved by decreasing the HAfiller amount and increasing the foaming temperature. Subsequent pyrolysis in air at temperatures of 900 °C and 1100 °C resulted in macroporous foams composed of HA and HA/b-TCP, respectively. The porous bodies with tailorable structure and composition are of interest for bone tissue engineering scaffolds and orthopedic implants.
Panjian Li, Kai Zhang and Clifford W. Colwell, Jr.
L. Müller et al., "Fabrication of Hydroxyapatite Ceramics with Interconnected Macro Porosity ", Key Engineering Materials, Vols. 284-286, pp. 277-280, 2005