Engenharia e Gestão Industrial

The Effects of Zinc Oxide on the Thermal and Mechanical Properties of Direct Synthesis Hydroxyapatite

Abstract

Ola Saleh Mahdi and Israa K Sabree

Effects Zinc oxide (ZnO) of on the mechanical (bending strength and hardness) and thermal stability of hydroxyapatite (HA) that directly synthesized by mechanical milling in a planetary ball mill, using orthophosphoric acid solution (H3PO4) and calcium hydroxide Ca(OH)2 was evaluated. High purity zinc oxide was added in ratios of 10, 30 and 50 percent by weight. HA/ZnO exhibited increasing in microhardness, and bending strength with increasing amount of ZnO addition. X-ray diffraction after sintering at 1100°C for synthesis of hydroxyapatite showed unstable compound, decomposed to β-TCP, while X-ray for the hydroxyapatite ZnO contained thermally stable HA phase and different amounts of ZnO, depending on the amount of ZnO added.