Anisotropic properties of highly textured porous alumina formed from platelets

Alumina platelets and a pulsed electric current sintering (PECS) technique were used to form porous alumina with highly oriented grains in one direction. A slurry consisting of alumina platelets, distilled water, and organic binders was spread over a gypsum board to form a green sheet. Pellets 14mm...

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Bibliographic Details
Published in:Ceramics international 2016-01, Vol.42 (1), p.1453-1458
Main Authors: Honda, Sawao, Hashimoto, Shinobu, Iwata, Syuya, Iwamoto, Yuji
Format: Article
Language:English
Subjects:
B. Platelets
Bending strength
C. Thermal conductivity
Orientation
Porous alumina
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Summary:Alumina platelets and a pulsed electric current sintering (PECS) technique were used to form porous alumina with highly oriented grains in one direction. A slurry consisting of alumina platelets, distilled water, and organic binders was spread over a gypsum board to form a green sheet. Pellets 14mm in diameter were punched from the sheet and preheated at 800°C to burn off the binders. The preheated pellets were placed in a carbon die, which was then positioned within the PECS device. After heating at 1400°C and 30MPa for 5min, porous alumina with 80.8% density was obtained. Parallel to the pressing direction, the thermal conductivity and bending strength of the porous body were 22.4Wm−1K−1 and 404MPa, respectively. Perpendicular to the pressing direction, on the other hand, the thermal conductivity and bending strength of the porous body were 10.8Wm−1K−1 and 217MPa, respectively.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2015.09.090