Effect of different sintering temperature and soaking time to the properties of bcp and mg-bcp
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Date
2019-07
Authors
Nor Atikah Binti Abu Bakar
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Abstract
This research was conducted to study the effect of doped magnesium (Mg2+) ions inside biphasic calcium phosphate (BCP) towards it properties, and also to investigate the effect of different sintering temperature and soaking time to the densification of biphasic calcium phosphate (BCP) and magnesium-doped biphasic calcium phosphate (Mg-BCP). BCP and Mg-BCP powders was successfully synthesized via aqueous precipitation method at room temperature. Several characterization methods been done towards BCP and Mg-BCP as-synthesized powder were Thermogravimetry-Differential Scanning Calorimetry (TGA-DSC), X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FESEM). The powders were then fabricated by uniaxial pressing method to form a 13 mm diameter pellet and followed by sintering process at three different temperatures (900 °C, 1100 °C and 1200 °C) and two different soaking time during sintering (60 minutes and 120 minutes) in atmosphere . The BCP and Mg-BCP sintered pellets had been characterized by FTIR (functional group), XRD (phase), diameter shrinkage, apparent porosity and bulk density measurement, Vicker’s hardness test, and FESEM (microstructure). The XRD results proven that the substitution of Mg2+ ions in BCP has increase the transition temperature of β-TCP to α-TCP. α-TCP is unwanted phase because it may reduce the hardness of BCP. This can be proven by determine the hardness value. M12 1hr (77.0 HV) pellets have higher hardness value compared to B12 1hr (29.9 HV). While higher sintering temperature results in higher densification (shrinkage and bulk density) of BCP and Mg-BCP. According to FESEM results, the longer the soaking time affects in increasing of grain size.