Processing and Properties of Sol-Gel-Derived Alumina/Silicon Carbide Nanocomposites

Dense alumina/5 vol% SiC nanocomposites were prepared by sol–gel processing using nanosized (180 nm) precoated SiC powders and a commercial boehmite sol. The SiC powder was precoated with boehmite by a controlled heterogeneous precipitation from an aluminum nitrate solution. The coated SiC powder wa...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2004-06, Vol.87 (6), p.1024-1030
Main Authors: Hareesh, Unnikrishnan Nair Saraswathy, Sternitzke, Martin, Janssen, Rolf, Claussen, Nils, Warrier, Krishna Gopakumar
Format: Article
Language:English
Subjects:
alumina
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramic matrix composites
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
nanocomposites
Nanoscale materials and structures: fabrication and characterization
Nanostructured ceramics
Other materials
Other topics in nanoscale materials and structures
Physics
Silicon
sol-gel
Specific materials
Structural ceramics
Technical ceramics
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Summary:Dense alumina/5 vol% SiC nanocomposites were prepared by sol–gel processing using nanosized (180 nm) precoated SiC powders and a commercial boehmite sol. The SiC powder was precoated with boehmite by a controlled heterogeneous precipitation from an aluminum nitrate solution. The coated SiC powder was then dispersed in a boehmite sol, gelled, calcined, and densified by gas pressure sintering under argon atmosphere at 7–8 MPa pressure. The dependence of the calcination conditions on densification, the effect of seeding on the microstructural development, as well as the mechanical behavior of the sintered specimens, are presented and discussed.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2004.01024.x