Abstract
Due to the uneven distribution of electric field and mechanical stress, cable joints often become the weakest link in High-Voltage Direct Current (HVDC) transmission systems. To address this problem, in this paper, ethylene propylene diene monomer (EPDM) and silicon carbide whisker (SiCw) were chosen as the rubber matrix and functional fillers, respectively, for fabricating the SiCw/EPDM composites with excellent nonlinear conductivity. The results show that SiCw can significantly improve the nonlinear conductivity of EPDM but at the expense of electric breakdown strength. To further reconcile the nonlinear conductivity and electric breakdown strength, hexagon boron nitride (h-BN) with excellent insulating property was also introduced into EPDM to obtain SiCw/h-BN/EPDM composites. The electrical and mechanical properties of the co-doped composites were systematically studied, and the results show that with the introduction of h-BN, the nonlinear conductivity characteristic of the composite was still maintained, while the breakdown field strength and mechanical properties were improved. The results of simulation analyses also proved that the SiCw/h-BN/EPDM composite material served as reinforced insulation in cable middle joint can markedly relieve electric field concentration. This work demonstrates that SiCw/h-BN/EPDM composites have greater potential for application in HVDC cable accessories.
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Acknowledgements
Tiandong Zhang acknowledges the support from the China Scholarship Council (CSC).
Funding
This work was supported by the National Natural Science Foundation of China (Nos. 52277024, U20A20308, 51977050), Heilongjiang Provincial Natural Science Foundation of China (No. ZD2020E009), China Postdoctoral Science Foundation (Nos. 2021T140166, 2018M640303), Heilongjiang Province Postdoctoral Science Foundation (No. LBH-Z18099), Fundamental Research for Universities of Heilongjiang Province (Nos. 2019-KYYWF-0208, 2018-KYYWF-1625), and University Nursing Program for Young Scholars with Creative Talents in Heilongjiang (No. UNPYSCT-2020178).
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Q.G. Chi conceived and supervised the project. T.D. Zhang and C.H. Zhang conceived the idea and designed the experiment. H.D. Xu performed the synthesis and preparation work. T.D. Zhang and H.D. Xu fabricated the characterization and discussed the results. Y.Q. Zhang and H.D. Xu performed the property measurement and conducted the electrical simulation. All authors contributed to the discussion and writing of the manuscript.
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Zhang, T., Xu, H., Zhang, C. et al. Investigation of electrical and mechanical properties of silicon carbide whisker-hexagonal boron nitride/ethylene propylene diene monomer composites. J Mater Sci: Mater Electron 34, 1451 (2023). https://doi.org/10.1007/s10854-023-10826-8
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DOI: https://doi.org/10.1007/s10854-023-10826-8