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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.125  No.4 (April) (2017)  >  pp.375-377

Journal of the Ceramic Society of Japan
<<Previous article Vol.125  No.4 (April) (2017)   pp.375 - 377 Next article>>

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

Akihiro SHIMAMURA1), Manabu FUKUSHIMA1), Mikinori HOTTA1), Tatsuki OHJI1), Yu-ichi YOSHIZAWA1), Naoki KONDO1)
1) National Institute of Advanced Industrial Science and Technology

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.


Keyword:
Alumina, Porous, Platelets

Received: November 07, 2016
Accepted: January 29, 2017 , Published online: April 03, 2017

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