Epoxy resin (EP) faces significant limitations in electronic applications due to its short corona resistance lifetime, while nanomaterial modification technology offers new avenues for enhancing its performance. This study synthesized a composite oxide (organic Si-Al-B composite oxide) using phenyl triethoxysilane (PTES), tributyl borate, and aluminum isopropoxide as monomers via a hydrolytic condensation reaction. By adjusting different doping levels, a series of epoxy resin composites (Si-Al-B/EP composites) were prepared. This study aimed to enhance the material's corona resistance while maintaining other electrical properties. The epoxy composite was systematically characterized and evaluated through X-ray photoelectron spectroscopy (XPS), dielectric property testing, breakdown field strength testing, volume resistivity measurement, and corona life testing. Results indicate that the Si-Al-B/EP composite exhibits optimal comprehensive performance when the molar ratio of Si:Al:B is 9:2.5:1 and the doping level is 8 wt %. Compared to pure EP, this composite demonstrates an approximately 13-times higher corona resistance lifetime and a 35% increase in breakdown field strength, while achieving a slight reduction in both dielectric constant and dielectric loss.
Sun et al. (Fri,) studied this question.