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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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Ageing Behavior of Injection-Molded ZTA Ceramics as a Function of Stabilizer Content

M. Abou el Ezz1, F. Kern2, R. Gadow2

1 Graduate School of Excellence for Advanced Manufacturing Engineering, Stuttgart University, Institute for Manufacturing Technologies of Ceramic Components and Composites, Allmandring 7 b, D-70569, Germany
2 Stuttgart University, Institute for Manufacturing Technologies of Ceramic Components and Composites, Allmandring 7 b, D-70569, Germany

received July 13, 2011, received in revised form September 19, 2011, accepted October 21, 2011

Vol. 2, No. 4, Pages 191-196   DOI: 10.4416/JCST2011-00025

Abstract

ZTA (zirconia-toughened alumina) ceramics are interesting materials for biomedical implants. High-quality implants are currently produced by means of cold isostatic pressing. The production of ZTA ceramic components by injection molding enables their mass production and an improvement in the cost and quality of complex near-net-shaped ceramic components. Injection-molded and hot-pressed ZTA materials with 10 vol% zirconia stabilized with 0, 1.5 and 3 mol% yttria were prepared and aged in an autoclave in water vapor at 134 °C for up to 48 h, corresponding to ∼ 175 years in vivo. The phase compositions of the aged samples were examined by means of X-ray diffraction. In both experiments, it was shown that the ageing resistance of ZTA materials rises significantly with increasing stabilizer content. Compared to injection-molded and pressureless-sintered materials, fully dense hot-pressed ZTAs have shown improved long-term ageing stability. The ageing behavior of ZTA is obviously dependent on the forming process, relative density and yttria content.

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Keywords

ZTA, ceramic injection molding, ageing behavior, mechanical properties

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