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Three types of milling media, alumina, zirconia and cemented tungsten carbide (CTC), were used for the solid-state preparation of SiAlON from Si3N4 using Y2O3-Al2O3-AlN as sintering aids. Fully densified α and β dual-phase SiAlON composites were obtained by gas pressure sintering (GPS) at 1750 °C for 1.5 hrs. The relative contents of α- and β-SiAlON and grain boundary phases in the sintered samples...
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