Abstract:
Present paper reports the influence of yolk addition on physical properties of porous aluminahydroxyapatite
composites prepared using protein foaming-consolidation method. Alumina and
hydroxyapatite (HA) powders were mixed with yolk at an adjusted mass ratio to make slurries.
The slurries were cast into molds and the dried for foaming- consolidation process. The dried
bodies were burned at 600ºC for 1 hour, followed by sintering at temperature of 1550ºC for
2 hours. The addition of yolk into the slurry shifted the rheological properties from shear thinning
behavior to a Newtonian fluid and resulted in bigger foaming capacity. The porous alumina-HA
composites with shrinkages in the range of 43.3 vol.% – 58.4 vol.% were obtained. The shrinkage
of bodies increased with increasing concentration of yolk. The compressive strength was 7.5 MPa
at 44.6% porosity 2.6 MPa at 57% porosity
