A review of thermal conductivity of epoxy composites filled with Al 2 O 3 or SiO 2

One way to improve properties of electrical machines is to enrich impregnating epoxy resin with AI2O3 or SIO2 nano- or micro-particles. This improves thermal conductivity of the insulation and reduces the temperature of a winding. The article reviews present work of scientists in the field of enrichment of the epoxy resins. Particle size influence is investigated and discussed same as usage of coupling agent. Experimental results are compared along scientific reports and new trend lines for further research are determined. Results of experiments promises improvements in efficiency of electrical machines, heat dissipation, dielectric strength and service life of insulating systems.