Abstract
The study is focused on the effect of Y2O3 content on the translucent duplex Mg-α/β-Sialon ceramics fabricated by hot press sintering. The content of α-Sialon phase was increased with increasing the amount of Y2O3 up to 1wt.%. In case of 2wt.% Y2O3 addition, the composition exceeds the α-Sialon region and β-Sialon was found to be a dominant phase. The least amount of Y2O3 addition (0.25wt.%) has shown better light transmittance than any other compositions. Although 1wt.% of Y2O3 addition shows higher α-Sialon phase, light transmittance was decreased due to increased in inter-granular phase between grain boundaries and triple junctions as revealed by micro-structural analysis. To a certain amount of Y2O3 addition enhanced the densification of powder compacts during sintering process and shows better mechanical properties. Overall, 0.25wt.% Y2O3 addition was the optimized composition with better translucency.
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