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- W2945748598 abstract "Abstract Silicone rubber is the outer dielectric material of the composite insulator used in high‐voltage transmission lines. A study of the microstructure evolution during corona discharge could provide a new understanding of catastrophic fracture in composite insulators. In this paper, the corona degradation process of silicone rubber is divided into three stages based on the data obtained by slow positron beam and electrochemical impedance spectroscopy. In stage I, the parameter decreases slightly in the low‐energy range, suggesting a crosslinking process in the polymeric “skin,” and the silicone rubber holds its high value of resistance, . In stage II, the organic sample surface is gradually transformed into an inorganic one. Further cracking of the surface layer contributes to a dramatic increase in the sample porosity. At the beginning of water immersion, the Bode phase angle remains approximately at low frequency, and a diffusion‐dependent Warburg impedance is observed. In stage III, a massive number of polar groups and inorganic particles are generated and the sample fails to repel water. The increase in the sample porosity is the main factor that leads to an ingress of water and failure of the material, while the generated polar groups are the secondary factor." @default.
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- W2945748598 date "2019-05-17" @default.
- W2945748598 modified "2023-09-29" @default.
- W2945748598 title "Investigation of the surface microstructure evolution of silicone rubber during corona discharge via slow positron beam and electrochemical impedance spectroscopy" @default.
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- W2945748598 doi "https://doi.org/10.1002/ppap.201900057" @default.
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