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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Processing, Microstructure and Properties of Paper-Derived Porous Al2O3 Substrates

C. Kluthe 1, B. Dermeik 2, W. Kollenberg 1, P. Greil 2, N. Travitzky 2

1 Department of Natural Science, Bonn-Rhein-Sieg University of Applied Sciences, von-Liebig-Str. 20, 53359 Rheinbach, Germany
2 Department of Materials Science and Engineering (Glass and Ceramics), University of Erlangen-Nuremberg, Martensstr. 5, 91058 Erlangen, Germany

received March 23, 2012, received in revised form June 20, 2012, accepted June 27, 2012

Vol. 3, No. 3, Pages 111-118   DOI: 10.4416/JCST2012-00008

Abstract

In this work, preceramic papers containing 85 wt% Al2O3 were heat-treated at 1600 °C to obtain paper-derived ceramics. In order to increase the preceramic paper density prior to sintering, the papers were calendered at different roll temperatures and pressures. The influences of the calendering parameters on the microstructure and mechanical properties of the preceramic papers and the paper-derived ceramics were investigated. It was expected that especially the mechanical properties of the papers and derived ceramics would be improved by calendering.

The increase in the preceramic paper density led to an increase by ∼ 85 % of the green tensile strength from ∼ 20 MPa to ∼ 37 MPa in cross direction (CD) and by ∼ 91 %, from ∼ 11 MPa to ∼ 21 MPa in machining direction (MD). An increase in flexural strength by ∼ 96 %, from ∼ 138 MPa to ∼ 270 MPa, was obtained for the paper-derived ceramics with an increase in density by ∼ 25 %, from ∼ 2.4 g/cm³ to ∼ 3.0 g/cm³, and the shrinkage after sintering was reduced from ∼ 15 % to ∼ 12 % owing to the previous calendering of the preceramic paper.

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Keywords

Preceramic paper, calendering, mechanical properties, sintering, porosity

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