Enhanced surface insulation and depressed dielectric constant for Al₂O₃/epoxy composites through plasma fluorination of filler

Abstract

is a kind of insulating ceramics with high rigidity and melting point, which has been widely used in the preparation of basin-type insulators [1]. Meanwhile, Al 2 O 3 is one of the most commonly used fillers for composites [2]. Filling nano-Al 2 O 3 can improve the mechanical strength [3-6], thermal stability [7,8], wear resistance [9, 10] and other properties of composite materials, but the improvement of surface insulation performance is not obvious [11,12].

Fluorinated SnO2/ER as an antistatic coating for enhancing the surface insulating strength of epoxy insulators

“…In the process of DBD plasma fluorination of SnO 2 powder, the filament arc ionized Ar and CF 4 gas, forming a large number of charged groups Ar + , CF 2+ , CF 3+ , F, and electrons. 30 At the same time, due to the chemical etching effect of the plasma, the particle surface morphology changes, so that the surface roughness increases and the activity increases. 38,39 As shown in Figure 16C, fluorine can be introduced into the surface of SnO 2 after fluorination, and a series of fluorinated functional groups can be formed and grafted onto the surface.…”

Transition of the dominant charge accumulation mechanism at a Gas‐solid interface under DC voltage

“…The state of the insulator surface also has a large impact on surface conductivity. Recently, surface fluorination [36,37], low-temperature plasma treatment [27,28] and nano coating [26,38,39] have been introduced to treat the insulator surface to inhibit the surface charge accumulation, and the surface conductivity will fluctuate within a certain range after such treatments [14]. In this study, the surface conductivity is adjusted by changing the basic conductivity s0 .…”

“…Furthermore, the researches about the surface conductivity are almost concentrated on the suppression of surface charge accumulation [26,27]. The rise of surface conductivity will increase the dissipation rate of surface charges [28].…”

Effect of morphology and particle size of bismuth ferrite filler on the surface insulation of epoxy resin composites

“…On the other hand, it also provides seed charges for surface discharge, which intensifies the development of the flashover process. [ 5–8 ] In view of the fact that the accumulation of surface charge can easily cause surface flashover, the researchers found that doping semiconductor nanofillers can regulate the distribution of traps inside EP composites, thereby alleviating space charge accumulation and improving the surface insulating properties of the composites. [ 9–11 ]…”