Effect of Re content on microstructure and mechanical properties of TiCN–WC–HfN ceramics

GAO Jiaojiao; PING Ping; LIU Jiabao; SONG Jinpeng

doi:10.19591/j.cnki.cn11-1974/tf.2023040001

Volume 42 Issue 1

Feb. 2024

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GAO Jiaojiao, PING Ping, LIU Jiabao, SONG Jinpeng. Effect of Re content on microstructure and mechanical properties of TiCN–WC–HfN ceramics[J]. Powder Metallurgy Technology, 2024, 42(1): 53-58. doi: 10.19591/j.cnki.cn11-1974/tf.2023040001

Citation:

GAO Jiaojiao, PING Ping, LIU Jiabao, SONG Jinpeng. Effect of Re content on microstructure and mechanical properties of TiCN–WC–HfN ceramics[J]. Powder Metallurgy Technology, 2024, 42(1): 53-58. doi: 10.19591/j.cnki.cn11-1974/tf.2023040001

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Effect of Re content on microstructure and mechanical properties of TiCN–WC–HfN ceramics

doi: 10.19591/j.cnki.cn11-1974/tf.2023040001

1.
College of Aeronautics and Astronautics, Taiyuan University of Technology, Taiyuan 030024, China
2.
Taiyuan Heavy Machinery Group Co., Ltd., Taiyuan 030024, China
3.
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China

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Corresponding author: E-mail: gaojiaojiao@tyut.edu.cn
Received Date: 2023-05-09
Publish Date: 2024-02-28

Abstract

Abstract

TiCN–WC–HfN ceramics were prepared by vacuum hot pressing sintering technology, and the effects of Re contents (molar fraction) on the microstructure and mechanical properties of the ceramics were investigated. The results show that, the TiCN–WC–HfN–Ni–Re ceramics are composed of TiC_0.41N_0.5, WC, HfN, TiC, Ni and Re, and TiC_0.4N_0.50 is the solid solution formed between TiC and TiN in the sintering process. Micro-pits and cleavage planes are discovered in the fracture surface of TiCN–WC–HfN ceramics with the different molar fraction of Re. When the molar fraction of Re is 2.5%, there are more micro-pits on the ceramic fractures. When the mole fraction of Re increases from 0 to 3.0%, the Vickers hardness, flexural strength, and fracture toughness of the TiCN–WC–HfN ceramics first increase and then decrease. When the mole fraction of Re is 2.5%, the mechanical properties of the ceramics show the best as the Vickers hardness is (19.25±0.21) GPa, bending strength is (1304±23) MPa, and fracture toughness is (7.73±0.22) MPa∙m^1/2. Transgranular fracture and intergranular fracture of the TiCN–WC–HfN–Ni–Re ceramics occur during the fracture process, and the toughening mechanisms are the crack deflection and crack bridging.
- TiCN–WC–HfN ceramics,
- Re,
- microstructure,
- mechanical properties

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References(23)

References

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