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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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Properties of Injection Moulded Alumina-Toughened Zirconia

F. Kern, R. Gadow

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

received May 26, 2010, received in revised form July 05, 2010, accepted October 06, 2010

Vol. 2, No. 1, Pages 47-54   DOI: 10.4416/JCST2010-00019

Abstract

Alumina-toughened zirconia (ATZ) materials are suitable materials for a variety of biomedical applications owing to their high strength, toughness and hydrothermal stability. The prospect of being able to offer ceramic implants to a broader group of patients requires a more cost-efficient near-net-shape manufacturing approach. Small and complex-shaped components can be efficiently mass-produced by means of ceramic injection moulding (CIM) with high surface quality and low dimensional tolerances. Compared to the state-of-the-art cold and hot isostatic pressing cycles commonly used for implant production, CIM technology does suffer from lower microstructural quality. During the thermally and rheologically transient mould-filling process, inevitably a certain number of defects are induced by flow textures, weld lines and micro-segregation. A higher level of toughness is therefore beneficial to keep strength and damage tolerance on a sufficiently high level. In order to improve thetoughness of ATZ, in-situ platelet reinforcement with strontium hexaaluminate precipitates was introduced. The influence on processing behaviour, strength and toughness of as-manufactured and final-machined platelet-containing and platelet-free 2.5Y-TZP/15 vol% alumina composites was investigated. Platelets improve the mechanical properties. Weibull statistics show that platelet addition leads to drastic improvements in reliability.

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Keywords

ATZ, CIM, platelets, Weibull statistics, toughening

References

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