Paper Title:
Aluminum Oxide Ceramics Obtained by Commercial Starch Consolidation with Gradient Porosity
  Abstract

The starch consolidation technique is commonly used for obtaining porous ceramics due to bonding and porous-maker starch characteristic during gelling process. The method adopted here improved the water drainage by using a plaster porous base (70 and 90 consistency values) improving the water drainage by action of gravity and the capillary effect. It used slip with 50 vol% solids and as precursors oxide A-1000SG and commercial cornstarch with a mass concentration varying from 10 to 40%. For comparison between the present method and the common one, slip was put in impermeable and permeable base moulds. The gelling occurred at 70°C for 2 hours and the drying at 110°C. Pre-sintering was carried out at 1000°C and the sintering at 1600°C with a plateau of 1 hour. Results showed that the plaster consistency of the mould bases was preponderant on ceramics porosity. Porosity and apparent density measurements using light and electron microscopy revealed variation of 5% of porosity from the top to the bottom of the samples.

  Info
Periodical
Edited by
Pietro VINCENZINI, Ralf RIEDEL, Alexander G. MERZHANOV and Chang-Chun GE
Pages
175-180
DOI
10.4028/www.scientific.net/AST.63.175
Citation
R. P. Mota, R. Sampaio Fernandes, É. de Campos, E. Ferreira de Lucena, M. A. Algatti, "Aluminum Oxide Ceramics Obtained by Commercial Starch Consolidation with Gradient Porosity", Advances in Science and Technology, Vol. 63, pp. 175-180, 2010
Online since
October 2010
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