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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