Microstructure and Mechanical Properties of Mg-Nano/Micro Hydroxy Apatite Composites Made by Powder Metallurgy Method

In this study Magnesium-Hydroxyapatite (Mg-HA) composites were prepared by powder metallurgy method using pure magnesium and synthesized hydroxyapatite powders. HA was synthesized in nano and micro scales powder by wet chemistry precipitation method and Mg-HA composites made in; 1, 3, 5 and 10 wt. % nano and 1, 5, 10 and 15 wt. % micro scale HA powders. The effects of particle size and amount of HA on microstructure and mechanical behavior of composites were investigated. Significant improvement in mechanical properties was observed by using nano HA for reinforcing Mg matrix because the HA distribution were better in nano-scale composites than the micro scale. The theoretical density of the composite prepared by adding 3 wt. % HA nano particles reached to 96 %, with 80.88 V hardness, and 131.52 MPa Ultimate shear stress, as optimum mechanical properties.