|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Production and Characterization of Magnesium Aluminate Spinel (MgAl2O4) Ceramics with Ligth Transmission by Spark Plasma Sintering
||Seyran Saridas, Filiz Sahin
|On-Site Speaker (Planned)
Transparent MgAl<SUB>2</SUB>O<SUB>4</SUB> spinel ceramics were produced by spark plasma sintering (SPS) method from stoichiometric mixture of MgO and Al<SUB>2</SUB>O<SUB>3</SUB> powders. The powder mixture was spark plasma sintered without sintering aid and with B<SUB>2</SUB>O<SUB>3</SUB> additive separately at same temperatures (between 1250 °C and 1350 °C for 20 minutes) to investigate effect of dope on optical and mechanical properties. Transparent polycrystalline MgAl<SUB>2</SUB>O<SUB>4</SUB> spinel was obtained with an in-line transmission of 65% for 550 nm (visible) and 85% for 1000 nm (IR) wavelengths. For optical characterization, the in-line transmission, T<SUB>in</SUB>, was measured by spectrophotometer in the visible and near-IR-wavelength ranges. The effect of additive on density/relative density were examined by Archimedes method while the hardness values were obtained by Vickers indentation technique. The microstructures of sintered spinel ceramics were determined by scanning electron microscopy (SEM) and phase identification was performed by X-ray diffractometry (XRD).
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