摘要
Silicon carbide(SiC)is widely used to improve the non-linear conductivity of non-linear resistive field grading composite.In this paper,the SiC nanoparticles are modified into core-shell nanoparticles with silica(SiO_(2))coating on the surface and are characterised by transmission electron microscopy and X-ray diffraction,respectively.The 7 wt%SiC@SiO_(2)/epoxy nanocomposite is then prepared,and the pure epoxy and 7 wt%SiC/epoxy nanocomposite are prepared as a contrast.The relative permittivity,thermally stimulated current,conductivity and breakdown strength are studied,respectively.The presence of SiO_(2)shell around SiC nanoparticles has a great effect on the relative permittivity and trap distribution.The epoxy nanocomposites show non-linear conductivity characteristics,compared with pure epoxy.The 7 wt%SiC@SiO_(2)/epoxy nanocomposite has higher switching electric field and breakdown strength than the 7 wt%SiC/epoxy nanocomposite,which is helpful for the application of non-linear resistive field grading composite in higher-voltage equipment or components.
基金
National Key R&D Program of China,Grant/Award Number:2018YFE0200100
National Natural Science Foundation of China,Grant/Award Number:52007043
Natural Science Foundation of Heilongjiang Province,Grant/Award Number:TD2019E002。
