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Colloidal Shaping of Alumina Ceramics by Thermally Induced Gelation of Methylcellulose
Author(s) -
Hareesh Unnikrishnan Nair Saraswathy,
Anantharaju Rakesh,
Biswas Papiya,
Rajeswari Kotikalapudi,
Johnson Roy
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04188.x
Subject(s) - slurry , materials science , colloid , ceramic , alumina ceramic , viscosity , chemical engineering , rheology , thermal , composite material , mineralogy , chemistry , thermodynamics , engineering , physics
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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