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Starch consolidation of alumina: Fabrication and mechanical properties
Published in
2009
Volume: 29
   
Issue: 11
Pages: 2219 - 2224
Abstract
A consolidation technique based on gelling property of starch was used to prepare alumina ceramics. Slurry containing alumina powder, dispersant and small amount of starch (2-3.5 wt.% of powder weight) was cast into a nonporous mould and heated to gelation temperature to produce a rigid green body. A defect free green body was obtained and the total linear shrinkage during drying was 2-3% and the green density observed was 64% of theoretical value. After complete drying, ceramic compacts were sintered without debinding operation. Sintered density of 99.4% was achieved after sintering at 1600 °C for 2 h. Flexural strength values of dried and sintered alumina were ∼10 and 247 MPa, respectively. The sintered ceramics showed an extremely dense microstructure. © 2009 Elsevier Ltd. All rights reserved.
About the journal
JournalJournal of the European Ceramic Society
ISSN09552219
Open AccessNo
Concepts (30)
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    AL<SUB>2</SUB>O<SUB>3</SUB>
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    ALUMINA CERAMIC
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    Alumina powder
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    CERAMIC COMPACTS
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    CONSOLIDATION TECHNIQUES
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    Debinding
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    Defect-free
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    Dispersant
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    Flexural strength
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    GELATION TEMPERATURE
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    GELLING PROPERTIES
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    GREEN BODY
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    GREEN DENSITIES
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    Linear shrinkage
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    Sintered ceramics
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    Sintered density
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    STARCH CONSOLIDATION
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    Theoretical values
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    Aluminum
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    Ceramic materials
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    Coagulation
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    Defect density
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    Dewatering
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    Gelation
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    Mechanical properties
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    Microstructure
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    Powders
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    Sintering
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    Starch
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    Sintered alumina