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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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