Abstract

• The milling-mixing Y2O3-ZrO2/HAp biocomposites have been investigated compared to the pure mixing ones to distinguish the effects of those two methods. The milling method reduced appreciably the particles size of the powders and resulting to better homogeneity and enhanced sinterability. The better densification process of HAp with ZrO2 favored to improve physical and mechanical properties of the biocomposite. The crystallized size of the milling-mixing samples was found to be 38.5 nm while pure mixing composite had a size of 46.2 nm. The former samples showed higher density than the latter ones in whole sintering temperature range (1050°C - 1250°C). Fine grains formation was also found in the milling-mixing samples. The highest flexural strength of 46.21 MPa and fracture toughness of 1.16 MPa.m1/2 were achieved by milling-mixing samples. The formation of apatite layer on the surfaces of Y2O3-ZrO2/HAp biocomposite samples also indicated the biocompatibility and potential bone forming ability.