Factors affecting the microstructure of a fine ceramic foam

Sintered cellular ceramics with varying degrees of reticulation were prepared using coarse and fine alumina powders and a 70/30 mixture thereof. The ceramic foams had fine cell size (about 150 μm diameter ) in each case. The method of preparation involved the free expansion of suspensions of these p...

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Bibliographic Details
Published in:Ceramics international 2000, Vol.26 (8), p.887-895
Main Authors: Peng, H.X., Fan, Z., Evans, J.R.G.
Format: Article
Language:English
Subjects:
Applied sciences
B. Microstructure
Building materials. Ceramics. Glasses
Ceramic foams
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
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Summary:Sintered cellular ceramics with varying degrees of reticulation were prepared using coarse and fine alumina powders and a 70/30 mixture thereof. The ceramic foams had fine cell size (about 150 μm diameter ) in each case. The method of preparation involved the free expansion of suspensions of these powders at 20 vol.% in a polyurethane foaming system. In order to modify the microstructure, the expansion was opposed using a die, and this reduced the void fraction and window size. In addition, directional rising was achieved by expanding the foam in a long cylindrical vessel and this modified the cell shape of the final foam. These foams have potential use in a range of applications including catalysis, but the main aim of the present work was to prepare preforms for metal matrix composites.
ISSN:0272-8842
1873-3956
DOI:10.1016/S0272-8842(00)00032-8