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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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Effect of the Addition of Ultrafine Powders on the Microstructure and Mechanical Properties of TiCN-Based Cermets

Y. Yang1,2, W. Dang1,2, J. Liu1,2, H. Zhang1,2, S. Gu1,2, C. Lei1,2, Y. Chen1,2

1 Fujian Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, Fujian, P.R. China
2 Xiamen Key Laboratory for Power Metallurgy Technology and Advanced Materials, Xiamen University of Technology, Xiamen 361024, Fujian, P.R. China

received July 18, 2021, received in revised form November 2, 2021, accepted November 7, 2021

Vol. 13, No. 1, Pages 15-22   DOI: 10.4416/JCST2021-00011

Abstract

In this study, ultrafine titanium carbonitride (TiCN) powders were prepared with an improved carbothermal reduction method. The microstructure and mechanical properties of TiCN-based cermets fabricated with different contents of ultrafine powders were investigated by means of scanning electron microscopy, X-ray diffraction, Vickers hardness and three-point bending tests. With the addition of ultrafine TiCN powder, the "black core-grey rim" phase was refined, and the "white core-grey rim" phase was gradually produced. The optimum content of ultrafine TiCN powder is 20 wt%. The cermets' hardness, bending strength and fracture toughness were increased by 2.5 %, 7.9 % and 20.4 %, respectively, compared to those without the addition of the ultrafine TiCN powders. The enhanced mechanical properties were attributed to fine grain strengthening, microcrack toughening, crack deflection and crack microbridging. In summary, a reasonable mixture of ultrafine TiCN and micron TiCN powders was beneficial to improve the comprehensive properties of TiCN-based cermets.

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Keywords

Ultrafine TiCN powders, cermets, microstructure, mechanical properties

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