Gelcasting of concentrated aqueous silicon carbide suspension

Gelcasting of high concentrated aqueous silicon carbide suspension with 50 vol.% solids loading is discussed in this paper. It is found that SiC powder is suitable for being suspended in basic solution, provided that a proper pH value is chosen for it. The rheological property of SiC suspension is a...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 20; no. 1; pp. 85 - 90
Main Authors Zhou, Longjie, Huang, Yong, Xie, Zhipeng
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 2000
Elsevier
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Gelcasting
Microstructure-prefiring
Miscellaneous
SiC
Suspensions
Technical ceramics
Gelcasting
SiC
Microstructure-prefiring
Suspensions
Colloidal gel
Casting
Silicon Carbides
Manufacturing
Particle suspension
Experimental study
Non oxide ceramics
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Summary:Gelcasting of high concentrated aqueous silicon carbide suspension with 50 vol.% solids loading is discussed in this paper. It is found that SiC powder is suitable for being suspended in basic solution, provided that a proper pH value is chosen for it. The rheological property of SiC suspension is also affected by solids loading. When SiC slurry is cast at 70°C, reaction between free Si on the surface of SiC powder and an organic base used as dispersant gives out H 2 gas, which produces pores in green bodies. However, by vacuum pumping and controlling pH value of the suspensions, complicated shapes of uniform SiC green bodies without pores are prepared.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(99)00138-7