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

Y. Yang, Y. Yang, W. Dang, W. Dang, J. Liu, J. Liu, H. Zhang, H. Zhang, S. Gu, S. Gu, C. Lei, C. Lei, Y. Chen, Y. Chen

Journal of Ceramic Science and Technology, Vol. 13, No. 1 (2022), pp. 15-22

DOI: 10.4416/JCST2021-00011

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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.

Keywords

Ultrafine TiCN powders, cermets, microstructure, mechanical properties

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