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Nianrong Zhou,Xiao He,Yuyang Yan,Xinliang Guo,Linshan Zhang,Yunhua He,Xiangyu Tan,Zhengyun Fang 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.2
The regeneration of transformer oil is a trending topic in the dielectric research field. However, the normal way of regeneration requires high cost and complicate process. In this paper, the non-woven polypropylene (PP) electret films were modifi ed by fluorination and corona method to achieve the regeneration function for transformer oil. The results show that the C-H bonds in polypropylene were replaced by C-F bonds during the fluorination process, resulting in the mean diameter of the fibers being decreased to a value of 1.7 μm. The increased roughness of the fi bers leads to super hydrophobicity. Further research revealed that the insulation properties of aging oil recovered after fi ltration by corona charged fl uorinated fi ber membranes. The result is especially signifi cant for breakdown voltage, the values of which reached half of the original insulating oil. In conclusion, the combination of fl uorinating and corona charging method on PP fi ber membrane shows great potential for insulation oil regeneration.
Hao Pang,Quanan Li,Xiaoya Chen,Peijun Chen,Xiangyu Li,Jinfeng Tan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
The effects of temperature and strain on dynamic recrystallization (DRX) and dynamic precipitation of Mg-6Gd-3Y-3Sm-0.5Zr alloy were studied through uniaxial compression. The main conclusions were as follows: the increase of strain ortemperature can promote DRX. The texture strength decreases with the increase of DRX fraction. The pyramidal <a> slipand pyramidal <c + a> slip were activated to coordinate strain when deformed at high-temperature. Under the deformationcondition of T = 400 °C, ̇ = 0.002 s−1 and ε = 0.35, the mechanism of DRX was mainly discontinuous dynamic recrystallization. The rotation continuous dynamic recrystallization gradually becomes the main mechanism with the increase ofstrain and temperature. At the same time, the particle stimulated nucleation (PSN) caused by a single large-sized Mg5(Gd,Y, Sm) or the aggregation of multiple Mg5(Gd, Y, Sm) phases was also found. The dynamic precipitation can stimulate thenucleation of DRX, and the boundary of DRXed grains can become an effective nucleation site for dynamic precipitation. DRX and dynamic precipitation can promote nucleation mutually.