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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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Microstructure and Mechanical Properties of Hot-Pressed Alumina – 5 vol% Zirconia Nanocomposites

F. Kern

Institute for Manufacturing Technologies of Ceramic Components and Composites, University of Stuttgart, D-70569 Stuttgart, Allmandring 7b

received October 8, 2010, received in revised form October 16, 2010, accepted October 22, 2010

Vol. 2, No. 1, Pages 69-74   DOI: 10.4416/JCST2010-00038

Abstract

Zirconia-toughened alumina (ZTA) ceramics are known to combine the hardness and abrasion resistance of alumina with an additional toughness increment introduced by zirconia. Toughening occurs by transformation toughening and/or microcracking depending on the grain size and stabilizer content of zirconia. In this study ZTA with 5 vol% unstabilized nanozirconia was manufactured by means of a mixing and milling technique and consolidated by hot pressing at 1350 – 1600 °C. Variation of the sintering conditions leads to nanocomposites with different microstructural features, such as grain sizes and inter- or intragranular location of zirconia reinforcement. It was found that despite the low zirconia content, attractive hardness and strength levels as well as moderate toughness values can be obtained.

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Keywords

Nanocomposites, ZTA, sintering, microstructure, zirconia, alumina

References

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