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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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