The Effect of Alumina and Hydroxyapatite Content on Morphology and Mechanical Properties of Mg Hybrid Composite for Biodegradable Implants Materials

摘要

In biomedical applications, Magnesium (Mg) as a biodegradable implant material becomes one of the most potential candidates for temporary implants and has attracted much people's attraction. It is because Mg is a light weight, non-toxic and able to degrade in human body. The aim of this research is to investigate the effect of hydroxyapatite(HA) and alumina (Al_2O_3) content on morphology and mechanical properties of Mg hybrid composite for biodegradable implants materials. Several of Al_2O_3 contents (i.e., 0, 5, 10, and 15 wt. %) were introduced in forming the Mg-Zn/HA/Al_2O_3 hybrid composite. The powder mixture of hybrid composite was milled separately in a planetary mill under gas argon atmosphere using a stainless steel container and balls. The powder was milled at 220 rpm for 1 hours and 3% of n-heptane solution was added prior to milling process to avoid the excessive cold welding of the powder. The powder was compacted under 400MPa and sintered with sintering temperature 300°C in a tube furnace for 1hour under the flow of argon. The results show that the sintered compacts were dispersed by uniform Al_2O_3 powder corresponding to white distribution of particles, as shown in the micrograph. As the Al2O3 content was increased to 15 wt. %, the mechanical properties such as hardness and compression test was improved.