Ceramics-Silikáty 47, (1) 13 - 19 (2003) |
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KINETIC STUDY OF Al₂O₃ SINTERING BY DILATOMETRY
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Holková Zuzana, Pach Ladislav, Kovár Vladimír,
Svetlík Štefan
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Department of Ceramics, Glass and Cement, Faculty of Chemical and Food Technology,
Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic
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Keywords: Al₂O₃, Boehmite, Sintering, Dilatometry, Ceramic membranes
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Sintering of α-Al₂O₃ powder (particles ≈ 1 µm), boehmite gels (particles ≈ 5 nm) and compositions of α-Al₂O₃, boehmite and
graphite has been studied by stepwise (SID) and individual (IID) isothermal dilatometry. Boehmite gel is a high temperature
binder and graphite is a pore forming material in the mentioned compositions. Boehmite derived alumina controls the sintering
process of compositions if it is present as a continuous phase. Kinetic parameters of sintering (exponent n and apparent
activation energy E) indicate different sintering mechanism of α-Al₂O₃ and Al₂O₃ derived from boehmite gels. Porosity of
α-Al₂O₃ ceramics can be managed by joint addition of boehmite gel and graphite. |
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