Tripathi, Himansu Shekhar and Das, S K and Mukherjee, B and Ghosh, Arup and Banerjee, Goutam (2001) Synthesis and thermomechanical properties of mullite-alumina composite derived from sillimanite beach sand: effect of ZrO2. Ceramics International, 27 (8). pp. 833-837. ISSN 0272-8842

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A mullite–aluminacomposite was developed by reaction sintering of sillimanitebeach sand and calcined alumina. ZrO2 (2–6 wt.%) was added as additive. The raw materials and additive were mixed, attrition milled and sintered in compacted form at 1400–1600°C with 2 h soaking. The effect of ZrO2 on the densification behaviour, thermo-mechanical properties and microstructure was studied. It was found that addition of ZrO2 slightly retards the densification process. All the samples achieved their highest bulk density at 1600°C. Thermo-mechanical properties of the sintered samples are not effectively altered by the presence of ZrO2. ZrO2 containing samples always show better resistance to thermal shock than the ZrO2 free samples. Scanning electron micrography shows that ZrO2 occupies both an intergranular and intragranular position in the mullite matrix. The mullite formed at 1600°C is mostly equiaxed in nature that suggests densification mainly occurs through solid state sintering.

Item Type: Article
Uncontrolled Keywords: Composites; Thermal shock; Mullite; Flexural strength; Sillimanite sand
Subjects: Engineering Materials
Divisions: Refractory
Depositing User: Bidhan Chaudhuri
Date Deposited: 29 Mar 2012 08:20
Last Modified: 29 Mar 2012 08:20

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