Study of Sintering on Mg-Zn-Ca Alloy System

摘要

Magnesium and its alloy have gained a lot of interest to be used in biomedical application due to its biodegradable and biocompatible properties. In this study, sintering process in powder metallurgy was chosen to fabricatenonporous Mg-6Zn-lCa (in wt%) alloy and porous Mg-6Zn-lCa-10Carbamide alloy. For creating porous alloy, carbamide (CO(NH_2)2 was added to alloy system as the space holder to create porous structure material. Effect of the space holder addition and sintering temperature on porosity, phase formation, mechanical properties, and corrosion properties was observed. Sintering process was done in a tube furnace under Argon atmosphere in for 5 hours. The heat treatment was done in two steps; heated up at 250 °C for 4 hours to decompose spacer particle, followed by heated up at 580 °C or 630 °C for 5 hours. The porous structure of the resulted alloys was examined using Scanning Electron Microscope (SEM), while the phase formation was characterized by X-ray diffraction (XRD)analysis. Mechanical properties were examined using compression testing. From this study, increasing sintering temperature up to 630 °Creduced the mechanical properties of Mg-Zn-Ca alloy.