Fabrication of biodegradable magnesium-based hybrid composite by powder metallurgy
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Date
2016-06
Authors
Hor Chee Hoong
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Abstract
This work aims to fabricate biodegradable magnesium/hydroxyapatite alumina (Mg/HA-Al2O3) composite via powder metallurgy method. Magnesium (Mg) is the most promising biomaterial due to its biocompatible properties while alumina (Al2O3) is used as reinforcement material due to its high hardness properties. Mg/HA-Al2O3 composite has been successfully fabricated under compaction pressure of 400 MPa and sintering temperature of 300 °C. Density of Mg/HA-Al2O3 from 5 wt% to 25 wt% of ceramic content which range from 1.73 to 1.84 g/cm3 is close to the density of bone (1.7 - 2.0 g/cm3) and there is an improvement of microhardness value of 41.50 to 56.20 HV as compared to 0 wt% of ceramic content (34.10 HV). Microstructure analysis shows that agglomeration of reinforcement particles is observed in Mg/HA-Al2O3 composite with 10 wt% of ceramic content. The agglomeration phenomenon has led to decreased in hardness and compressive strength. Biodegradation test shows that Mg/HA-Al2O3 with 20 wt% of ceramic content has the lowest corrosion rate (20.31 mgcm-2h-1) among all the Mg/HA-Al2O3 composite.