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Microstructure, Mechanical and Tribological Properties of High-Entropy Carbide Ceramics (VNbTaMoW)C5–SiC

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Powder Metallurgy and Metal Ceramics Aims and scope

The (VNbTaMoW)C5–SiC high-entropy ceramics were prepared by spark plasma sintering at 1900°C and 40 MPa. The effects of SiC content (0–30 wt.%) on the microstructure, mechanical properties, and tribological properties were examined. The results showed that the matrix phase (VNbTaMoW)C5 exhibited a face-centered cubic structure, and the second phase (SiC) was uniformly distributed, inhibiting excessive grain growth. The relative density of (VNbTaMoW)C5– SiC composite ceramics decreased first and then dropped as SiC content increased. The fracture mode of (VNbTaMoW)C5–SiC composite ceramics changed from transgranular to mixed (transgranular fracture and intergranular) fracture with an increase in SiC content due to weak bonding between (VNbTaMoW)C5 and SiC. The grains of the (VNbTaMoW)C5 in multiphase ceramics were refined because of the grain growth-inhibiting effect of SiC. With the increase in SiC content, the hardness of (VNbTaMoW)C5–SiC multiphase ceramics increased, and the fracture toughness first increased and then decreased. The (VNbTaMoW)C5–20 wt.% SiC multiphase ceramics exhibited the best mechanical properties with Vickers' hardness and fracture toughness of 18.2 GPa and 5.7 MPa ∙ m1/2, respectively. Coupled with WC, (VNbTaMoW)C5–SiC multiphase ceramics exhibit good wear resistance with a specific wear rate of (5.7–8.1) ∙ 10–8 mm3/N ∙ m.

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Acknowledgment

This study was funded by the Natural Science Foundation of Ningxia, China (2022AAC03219), the Innovation Training Program for College Students of Ningxia (S202111047003), the Graduate Student Innovation Program (YCX22135, YCX22152), and the Fundamental Research Funds for the Central Universities, North Minzu University (2022XYZCL02). The authors declare no conflict of interest.

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Authors and Affiliations

  1. College of Materials Science & Engineering, North Minzu University, Ningxia Yinchuan, 750021, P.R. China

    Zhang Hai, Wu Zihao, Chen Hao, HE Yuqi, Zhang Shunli, Yuan Zhenwei, Zhang Shubo & Hai Wanxiu

  2. Key Laboratory of Powders & Advanced Ceramics, North Minzu University, Ningxia Yinchuan, 750021, P.R. China

    Hai Wanxiu

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  1. Zhang Hai
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Correspondence to Hai Wanxiu.

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Published in Poroshkova Metallurgiya, Vol. 61, Nos. 7–8 (546), pp. 80–88, 2022.

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Hai, Z., Zihao, W., Hao, C. et al. Microstructure, Mechanical and Tribological Properties of High-Entropy Carbide Ceramics (VNbTaMoW)C5–SiC. Powder Metall Met Ceram 61, 451–458 (2022). https://doi.org/10.1007/s11106-023-00332-1

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