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To address the insulation failure of epoxy resin (EP) used in stator windings of large generator caused by long-term coupling degradation effect of electrical and thermal stress, it is urgent to develop epoxy resin composite dielectrics with both excellent thermal conductivity and mechanical strength. In this study, SiCn@SiCp/EP composite dielectrics with varying SiCn and SiCp contents were prepared by using epoxy resin as the matrix, silicon carbide particles (SiCp) as the nonlinear conductivity base elements, and high aspect-ratio silicon carbide nanowires (SiCn) as the network skeleton. The results show that the multi-scale three-dimensional functional network formed by the mutual matching bridging of SiCn and SiCp provides transmission channels for external stress and internal phonons. The tensile strength, toughness, and thermal conductivity of composite dielectrics reach 64.8 MPa, 1.86 MJ/m3, and 0.326 W/(m·K), respectively. Meanwhile,affected by the percolation network, the composite dielectrics exhibit superior nonlinear conductive characteristics at relatively low SiC content, with a nonlinearity coefficient as high as 7.79 and a threshold field strength of only 2.12 kV/mm. The mutual matching of different morphologies of the same material avoids the complex issues arising from differences in interfacial interactions among multiple heterogeneous fillers in previous studies.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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