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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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Influence of Microstructure on Crack Tip Toughness of α-Sialon Ceramics

C.T. Bodur1, M. Thiele2, M. Herrmann2

1 Istanbul Technical University, Department of Mechanical Engineering, Gümüssuyu 34437 Istanbul, Turkey
2 Fraunhofer Institute for Ceramics Technologies and Systems, Winterbergstrasse 28, 01277, Dresden, Germany

received November 15, 2011, received in revised form April 3, 2012, accepted April 29, 2012

Vol. 3, No. 3, Pages 105-110   DOI: 10.4416/JCST2012-00010

Abstract

For two different α-Sialon ceramics, one with a stoichiometric composition and the other one with an extra amount of yttria, the fracture toughness (SEVNB) and the crack opening displacements (COD) in the crack tip (CT) region were measured. The fracture toughness values were 3.0 MPa√m for the material without excess Y2O3 and 4.5 MPa√m for the material with a residual grain boundary phase. In contrast, the crack tip toughness of α-Sialon with the stoichiometric composition was 1.35 – 1.68 MPa√m and 0.95 – 1.01 MPa√m for the α-Sialon with an excess amount of yttria. Crack behavior in α-Sialon with an excess amount of yttria is both intergranular and transgranular owing to the formation of large elongated grains, and mainly intergranular in α-Sialon with stoichiometric composition. The different crack behavior and the resulting crack tip toughness are the result of the different chemistry and changed microstructure of the materials.

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Keywords

Sialon, microstructure-final, toughness and toughening, mechanical properties, crack tip toughness

References

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