Abstract
In this study, the method of co-doping semi-conductor silicon carbide (SiC) and insulating inorganic phase hexagonal boron nitride (h-BN) in epoxy resin (EP) composites has been proposed for considering both the nonlinear conductivity and the breakdown strength. First, the epoxy-based composites were fabricated and prepared by hot press vulcanization. Then, the phase structure and the microstructure of the composites were characterized by XRD and SEM. Finally, the nonlinear conductivity and the breakdown strength of the composites were tested. The results indicate that the breakdown strength of the 1 wt. % h-BN/3 wt. % SiC/EP composite reaches 115.6 kV/mm, which is 4 times higher than that of the single-doped 3 wt. % SiC/EP composite. More importantly, the appropriate h-BN and SiC contents of the co-doped EP composites still exhibit excellent nonlinear electrical conductive properties. The results indicate that both the nonlinear conductivity and the breakdown strength have been obtained by the semi-conductor and insulator co-doping strategy.
Highlights
With the rapid development of high voltage direct current (HVDC) transmission technology, polymer materials, such as silicone rubber, polyvinyl chloride, epoxy resin (EP), and polyethylene, have been widely used in power systems.1–5 Among them, epoxy resin has been widely used as the insulating material for electrical equipment because of its low shrinkage during curing, easy molding, heat resistance, and high mechanical and electrical strength.6–8 as the voltage level of the system increases, it becomes more and more urgent to maintain a uniform electric field in an insulated device or a component
The results indicate that the breakdown strength of the 1 wt. % h-BN/3 wt. % silicon carbide (SiC)/EP composite reaches 115.6 kV/mm, which is 4 times higher than that of the single-doped 3 wt. % SiC/EP composite
The results showed that the SiC/EP composites had obvious nonlinear conductivity, and the threshold electric field corresponding to the nonlinear conductivity decreased with an increase in the filler content
Summary
With the rapid development of high voltage direct current (HVDC) transmission technology, polymer materials, such as silicone rubber, polyvinyl chloride, epoxy resin (EP), and polyethylene, have been widely used in power systems. Among them, epoxy resin has been widely used as the insulating material for electrical equipment because of its low shrinkage during curing, easy molding, heat resistance, and high mechanical and electrical strength. as the voltage level of the system increases, it becomes more and more urgent to maintain a uniform electric field in an insulated device or a component. The results showed that the SiC/EP composites had obvious nonlinear conductivity, and the threshold electric field corresponding to the nonlinear conductivity decreased with an increase in the filler content.16 These fillers can significantly improve the nonlinear conductive characteristics, few studies focus on the study of the electric breakdown strength of the nonlinear conductive composite materials, which may be seriously degraded by introducing the conductor and semi-conductor inorganic fillers. The EP is selected as the polymer matrix, and the semi-conductor SiC acts as inorganic fillers for improving the nonlinear conductive properties of EP; the co-doped insulator BN and semi-conductor SiC have been proposed for improving the degraded breakdown strength of the epoxy resin-based composites with single-doped SiC. The nonlinear conductivity can be observed in the h-BN and SiC co-doped EP composites
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