Colloidal Shaping of Alumina Ceramics by Thermally Induced Gelation of Methylcellulose
Authors: Hareesh, Unnikrishnan Nair Saraswathy; Anantharaju, Rakesh; Biswas, Papiya; Rajeswari, Kotikalapudi; Johnson, Roy
Source: Journal of the American Ceramic Society, Volume 94, Number 3, March 2011 , pp. 749-753(5)
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.
Document Type: Research Article
Affiliations: Centre for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500005, India
Publication date: March 1, 2011