Fabrication and characterization of porous alumina with a surface layer composed of alumina platelet by direct-foaming method

Porous alumina with the surface layer was fabricated from an alumina platelet/novolac-HexaMethyleneTetramine (HMT) composite. HMT was used as a blowing agent as well as a curing one for the novolac binder. When the alumina platelet/novolac composite was heated with covering its surface with filter p...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2017/04/01, Vol.125(4), pp.375-377
Main Authors: SHIMAMURA, Akihiro, FUKUSHIMA, Manabu, HOTTA, Mikinori, OHJI, Tatsuki, YOSHIZAWA, Yu-ichi, KONDO, Naoki
Format: Article
Language:English
Subjects:
Alumina
Aluminum oxide
Bend strength
Blowing agents
Curing agents
Filter paper
Foaming
Hexamethylenetetramine
Platelets
Porous
Surface layers
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Summary:Porous alumina with the surface layer was fabricated from an alumina platelet/novolac-HexaMethyleneTetramine (HMT) composite. HMT was used as a blowing agent as well as a curing one for the novolac binder. When the alumina platelet/novolac composite was heated with covering its surface with filter papers, a porous structure formed inside the composite due to blowing from HMT. On the other hand, the blowing gas near the surface was evolved outward through the filter paper, which resulted in the formation of the surface layer composed of the aligned alumina platelets. Effect of the surface layer on the mechanical strength was examined by three-point bending measurement. The bending strength of the obtained porous alumina increased by 94% compared to the porous alumina without the surface layer.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.16254