Thermal Decomposition Mechanism of Environmental-Friendly Insulating Gas C5F10O on Cu (1 1 1) Surface

Zeng, Fuping; Feng, Xiaoxuan; Lei, Zhicheng; Xia, Yalong; Wu, Siying; Zhang, Shiling; Yao, Qiang; Tang, Ju

doi:10.1007/s11090-021-10184-5

Cited by 3 publications

(1 citation statement)

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“…As an example, in the study on the compatibility between C 5 F 10 O and copper, after only eight hours of coexistence at 120 °C, micro corrosion marks could be observed on the surface of Cu electrodes, which need to be in contact with C 5 F 10 O throughout the years in a GIS [ 13 ]. Meanwhile, long-term exposure to C 5 F 10 O/N 2 mixture has been reported to corrode the surface and reduce the tensile strength of ethylene propylene diene monomer (EPDM) [ 14 ]. The degradation of material properties can significantly impair the performance of GIS, leading to reduced safety and reliability over prolonged operation [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Degradation Behaviors and Mechanism of Nitrile Butadiene Rubber Caused by Insulating Medium C5F10O

et al. 2023

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C5F10O is a promising insulating medium in the manufacturing of environmentally friendly gas-insulated switchgears (GISs). The fact that it is not known whether it is compatible with sealing materials used in GISs limits its application. In this paper, the deterioration behaviors and mechanism of nitrile butadiene rubber (NBR) after prolonged exposure to C5F10O are studied. The influence of C5F10O/N2 mixture on the deterioration process of NBR is analyzed through a thermal accelerated ageing experiment. The interaction mechanism between C5F10O and NBR is considered based on microscopic detection and density functional theory. Subsequently, the effect of this interaction on the elasticity of NBR is calculated through molecular dynamics simulations. According to the results, the polymer chain of NBR can slowly react with C5F10O, leading to deterioration of its surface elasticity and loss of inside additives, mainly ZnO and CaCO3. This consequently reduces the compression modulus of NBR. The interaction is related to CF3 radicals formed by the primary decomposition of C5F10O. The molecular structure of NBR will be changed in the molecular dynamics simulations due to the addition reaction with CF3 on NBR’s backbone or branched chains, resulting in changes in Lame constants and a decrease in elastic parameters.

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Section: Introductionmentioning

confidence: 99%