Ceramics-Silikáty 50, (4) (2006) |
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ALUMINA CERAMICS PREPARED BY PRESSURE FILTRATION OF ALUMINA POWDER DISPERSED IN BOEHMITE SOL
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Bodišová Katarína 1, Pach Ladislav 1, Kovár Vladimír 1,
Čerňanský Alojz 2
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1 Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic
2 Faculty of Mechanical Engineering, Slovak University of Technology, Námestie slobody 17, 812 31 Bratislava, Slovak Republic
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Keywords: Alumina ceramics, Submicrometre grain size, Boehmite sol, Dispersant
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The alumina ceramics was prepared by pressure filtration of electrostatically stabilized alumina and alumina - boehmite
water suspensions and subsequent pressureless sintering of as-prepared compacts. The aggregates formation was avoided by
stabilization of initial suspension through the regulation of interparticle forces. Nanoparticle boehmite sol was used as a dispersant
for alumina suspension, it acts as a lubricant, and moreover it enhances the handling strength of the green compacts
and also its sinterability. The kinetic analysis of sintering confirmed, that the definite boehmite addition (2.7 wt.% in green
compact) affects positively the densification. The higher amount of boehmite addition has negative influence; it causes the
flocculation of the suspensions and decreases the density of sintered bodies. |
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