Abstract:
In this study , Alumina (Al2O3) and hydroxyapatite (HAP) composite were prepared by using
powder metallurgy (PM) technique of vacuum sintering. As alumina non osteoinductive its
bio- inertness did not allow bone ingrowth. To obtain a novel material for load bearing
biomedical applications with relatively low lower modulus, adequate strength as well as
excellent biocompatibility Alumina (Al2O3) and hydroxyapatite (HAP) composite that
possess bio inertness and biocompatibility have been developed. For proper characterization
purpose four compositions of the composite were prepared with Alumina concentration of
60,70,80 and 90 percent and Hydroxyapatite concentration of 40,30,20 and 10 percent of the
two total volume. Powders were mixed by using Ball Mill and Cold compacted by using
hydraulic press. The green pellets were vacuum sintered at 1300°C and 1350 °C for 2,3 and
4 hours of dwell time . Then all samples grinded and polished for characterization.
Micostructure of the samples was analyzed by scanning electron microscope and optical
microscope to onserve the uniformity of powders distribution and densification. Moreover
density and micro hardness test were carried out to assess the mechanical strength of the
sintered samples.
According to research results, mechanical properties of the composites are increased by
increasing the concentration of Al2O3 and decreased by increasing the amount of HAP. And
the composition with 70% alumina and 30% of hap was considered as best for biomedical
applications when it is sintered at 1350°C for four hours.
