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Colloidal Shaping of Alumina Ceramics by Thermally Induced Gelation of Methylcellulose

Authors

  • Unnikrishnan Nair Saraswathy Hareesh,

    1. Centre for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
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    • *Member, The American Ceramic Society.

  • Rakesh Anantharaju,

    1. Centre for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
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  • Papiya Biswas,

    1. Centre for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
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    • *Member, The American Ceramic Society.

  • Kotikalapudi Rajeswari,

    1. Centre for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
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  • Roy Johnson

    Corresponding author
    1. Centre for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
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    • *Member, The American Ceramic Society.


  • G. Franks—contributing editor

†Author to whom correspondence should be addressed. e-mail: royjohnson@arci.res.in

Abstract

Dense alumina ceramics have been fabricated by the colloidal shaping of alumina slurry using methylcellulose as the networking additive. Concentration as low as 0.08 wt% of methylcellulose had been found to be sufficient enough to convert an alumina slurry of 74–75 wt% solid loading, to consolidated shapes by thermal gelation at 70°–80°C. Cast shapes could be sintered to dense alumina (99% TD) at temperatures in the range of 1500°–1525°C at a minimum heating rate of 180°C/h. The effect of methylcellulose concentration on the viscosity of suspensions was studied and green strengths of samples are investigated.

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