1. Influence of calendering on the properties of paper-derived alumina ceramics.
- Author
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Schlordt, Tobias, Dermeik, Benjamin, Beil, Veronika, Freihart, Matthias, Hofenauer, Andreas, Travitzky, Nahum, and Greil, Peter
- Subjects
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ALUMINUM oxide , *PAPER , *CALENDERING of plastics , *CERAMIC metals , *TEMPERATURE effect , *THICKNESS measurement - Abstract
The effect of calendering of alumina loaded preceramic papers in a hard nip laboratory calender at various temperatures, line loads and times of nip passes on their green and sintered properties was investigated. The main objective was to achieve a maximum densification, which resulted in a maximum reduction of thickness of 45%, a green density of 80.5% of the theoretical density and a sintered density of 81% of the theoretical density. The ring-on-ring flexural strength of sintered specimen could be increased from 71±11MPa to 138±33MPa. The surface roughness of green samples could be diminished to a value for R a of below 2µm compared to an R a of 13.2µm for an uncalendered paper, whereas the R a value of the sintered samples was much higher due to the burn-off of the cellulose fibers. Preceramic papers manufactured by the dynamic hand-sheet-forming process exhibit a fiber-orientation which causes anisotropic effects regarding the sintering shrinkage, the surface roughness and Young's modulus. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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