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Yongqiang Wang,Changhui Feng,Yu Luo,Ruoyu Fei 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
To study the variation of surface characteristics of glass fiber reinforced epoxy composite insulation materialsduring the development of tracking, this paper established an experimental platform for tracking under the inclined platemethod and prepared samples of glass fiber reinforced epoxy resin. In this paper, according to the experimental dischargephenomenon, discharge repetition rate phase diagram and corrosion degree of materials, the process of tracking was dividedinto four stages: initiation, stability, development and outbreak stages. Scanning electron microscope was used to observe thechange of micromorphology of samples in different stages of tracking. The content of elements in different stages of trackingwas determined by energy dispersive spectrometer. The surface characteristic functional groups in different stages of trackingwere measured by Fourier transform infrared spectroscopy. The results show that with the change of surface morphology andthe formation of surface products during tracking, the content of C element in the spherical region of the material decreasedfirst and then increased, and the content of O and Si increased first and then decreased. The epoxy group of the material wasgradually decomposed. Carbonyl group was generated on the surface of the material, and then decomposed during theoutbreak stages. In addition, the deterioration mechanism of thermal aging and tracking was quite different. Thermal agingprovided convenient routes for the electron injection into the material during tracking, thus reducing the tracking and erosionresistance of the material.
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