Influence of the water content of milling medium on the mechanical properties of Reaction Bonded Aluminium Oxide (RBAO) ceramics
J. Temuujin1,2,3, J. Coronel1 and M. Senna2
1Advanced Ceramics Group, Technical University of Hamburg-Harburg,
Hamburg, Denickestrasse 15, D-21073 (Germany)
E-mail: jtemuujin@yahoo.com
2Department of Applied Chemistry, Faculty of Science and Technology,
3-14-1 Hiyoshi, Kohoku-ku, Keio University, Yokohama 223-8522 (Japan)
3Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences,
Ulaanbaatar 51 (Mongolia)
(Received November 25, 2005; in revised form December 2, 2005)
Pages: 55-58
Abstract
Influence of the water content of milling medium on the properties of reaction bonded aluminium oxide powder precursors and their sintered mechanical properties is studied. As a result of interaction between absolute ethanol and aluminium, the water content of the mixture milled in absolute ethanol increased to 4.7 %. Mechanical properties such as bending strength and toughness of the sintered ceramics depend on the water content of the powder precursors. Higher bending strength, 350 MPa and toughness, 3.7 MPa m1/2 were observed in the sample milled in absolute ethanol. Higher water content of the mixture milled in absolute ethanol is the main reason of the high mechanical properties.
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