Fluorine gas treatment improves surface degradation inhibiting property of alumina-filled epoxy composite

Abstract

Epoxy resins blended with micro-sized alumina show more compact surface condition and exhibit lower light emission after modified in fluorinated atmosphere. Surface morphology reflected by atomic force microscope shows that the fluorinated surface layer can overlap alumina particles inlayed in the original surface and a smoother and more compact surface condition is generated. Thermally stimulated current test exhibits that surface fluorination is able to bring more shallow traps to surface states, and the trap amount increases with the extension of fluorinating time. The photon counting technique illustrates that the fluorinated surface has lower light emission which indicates better aging inhibition properties. Therefore, we believe that the surface fluorination technique may have potential significance in modifying epoxy based insulators used in high voltage applications.

Effect of long‐term fluorination on surface electrical performance of ethylene propylene rubber

“…Furthermore, the aging property of the surface under various electric fields can be improved. As a result, the aging resistance under arcing could be enhanced, as has already been discussed in Section 3.1 as well as our previous research [21]. Meanwhile, it can be seen from the EDS curve and the element content chart that the proportion of F element content is increased with the fluorination time increasing from 120 to 480 min.…”

“…The technique of surface fluorination is to use a mixer of fluorine gas and nitrogen to directly contact the surface of the specimen under a certain temperature and pressure. The surface chemical structure can thereby be modified, due to a strong oxidation of fluorine gas [21]. The surface fluorination is a process in which a hydrogen atom on the specimen surface being substituted to form a chain such as CH 2 ‐CHF‐CH 2 –, –CHF‐CH 2 ‐CHF– and –CHF‐CHF‐CHF–.…”

Deposition of SiCxHyOzthin film on epoxy resin by nanosecond pulsed APPJ for improving the surface insulating performance

“…It can be speculated that when the Si containing inorganic groups deposited on the EP sample, the decrease of C=O in ester group and C=C in p-substituted benzene of the EP samples resulted in the reducing of energy level [54,55]. A lower energy level meant shallower traps in EP samples and the trapped charge could easily de-trap from shallower trap [56]. The shallowing of the trap level and the increasing of surface conductivity resulted in the promotion of surface charge dissipation rate (figures 5 and 6).…”

High Temperature Insulation Materials for DC Cable Insulation — Part III: Degradation and Surface Breakdown

“…In order to evaluate the reliability of different high temperature insulation materials in harsh operating environments, important aging factors must be studied in complex conditions. These factors mainly include space charge and surface charge transport behaviors [6][7][8], insulation breakdown and surface flashover trigger mechanism [9][10][11][12], insulation aging mechanisms and charge suppression methods [13][14][15][16], etc. However, uncertain factors in complex environments, such as the temperature variation due to the changing of engine output power, the gas pressure changes when aircraft reaches different altitudes, local contamination due to leakage of oil or environmental pollution, directly influence the insulation performance, leading to greatly increased complexity and difficulty for related fundamental and applied researches.…”