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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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Oxidative Crack Healing in Al2O3 Composites Loaded with Ti2AC (A = Al, Sn) Repair Fillers

B.J. Pedimonte, G. Bei, D. Pourjafar, T. Fey, P. Greil

University of Erlangen-Nuernberg, Department of Materials Science (Glass and Ceramics) Martensstr. 5, 91058 Erlangen, Germany

received December 03, 2013, received in revised form January 15, 2014, accepted February 04, 2014

Vol. 5, No. 1, Pages 63-68   DOI: 10.4416/JCST2013-00044

Abstract

Crack healing of alumina composites loaded with 5, 10, and 20 vol% Ti2AC (A = Al or Sn) MAX phase was investigated. Surface cracks were prepared by means of indent loading and the modulus of rupture was measured on virgin, indented, and healed specimens. The MAX phase particles serve as repair filler which reacts with oxygen penetrating along a surface crack and filling disrupted crack surfaces with the oxidation reaction products. After annealing for 3 h composites loaded with 20 vol% Ti2AlC showed full recovery at a healing temperature of approximately 900 °C, whereas lower temperatures of 700 °C were observed for specimens loaded with 10 and 20 vol% Ti2SnC. The enhanced healing response of Ti2AC-loaded composites containing Sn instead of Al on the A-position offers high potential for providing crack healing capability to ceramic matrix composites applied at moderate temperatures below 1000 °C.

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Keywords

MAX phase composites, crack healing, repair filler, alumina, oxidation

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