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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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Anisotropic Fracture Toughness and Microstructure of Graphene-Reinforced TiC/Si3N4 Composite

Y. Zhang1,2, G. Xiao1,2, C. Xu1,2, M. Yi1,2, X. Meng1,2

1 School of Mechanical and Automotive Engineering, Qilu University of Technology, Jinan 250353, China
2 Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong, Qilu University of Technology, Jinan 250353, China

received April 21, 2016, received in revised form June 16, 2016, accepted June 24, 2016

Vol. 7, No. 4, Pages 323-328   DOI: 10.4416/JCST2016-00032

Abstract

Using the hot pressing sintering process, graphene-platelets (GPLs)-reinforced TiC/Si3N4 composite (GPLs/TiC/Si3N4) was prepared with the aim of improving its fracture toughness. Microstructure analysis shows that the pressure applied during the hot pressing sintering process leads to the orientational distribution of GPLs perpendicular to the pressing direction in the GPLs/TiC/Si3N4 composite. With the single-edge notched beam method, the fracture toughness of GPLs/TiC/Si3N4 was measured in the hot pressing direction (HPD) and perpendicular to the hot pressing direction (PHPD). The fracture toughness of the composites in HPD is higher than that in PHPD. The maximum fracture toughness of 9.6 MPa · m1/2 in HPD was achieved for the composite containing 1 wt% GPLs, which was approximately 31.5 % higher than that of 7.3 MPa · m1/2 in PHPD. Raman spectra showed that the defect in PHPD was larger than that in HPD. The Raman intensity of the composite in HPD is higher than that in PHPD. The toughening mechanisms include crack deflection, graphene bridging and the pull-out of GPLs, which were observed and discussed.

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Keywords

Graphene, orientation, fracture toughness, microstructure

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