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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 52  1993
Mechanical Properties and Microstructural Character of Isopressed Reaction Sintered Mullite-Zirconia Composites
K. DAS, B. MUKHERJEE AND G. BANERJEE
Pages : 47-50
DOI : 10.1080/0371750X.1993.10804573
Abstract
Zircon flour and alumina mixtures, fabricated in the fonn of discs, rods and bars, were cold isostatically pressed and sintered. The resulting mulli•zirconia composites were characterized in terms of mechanical properties and microstructural features. The effect of yttria addition on the final properties is also reported. Fine zircon and alumina mixtures with yttria addition resulted in dense composites with uniformly distributed rounded zirconia particles. A sintering temperature of 1550°C with two hours soaking yielded the best results in terms of fired density, flexural strength, fracture toughness, microhardness and tetragonal (t·) Zr02 contenL Addition of 1.86 and 3.0 wt% Y 20 1 resulted in significant improvement in terms of strength and t-Zr02 contenL A drop in the t-Zr02 content with relatively large grain size was observed when the sintering temperature was raised to 1650°C.
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