Electrical and Mechanical Properties of Epoxy/Micro-sized Alumina Composite and the Effect of Nano-sized Alumina on Those Properties

Authors:
  • JPJae-Jun Park
    Jae-Jun Park
  • SSSeong-Sik Shin
    Seong-Sik Shin
  • CYChan-Young Yoon
    Chan-Young Yoon
  • JLJae-Young Lee
    Jae-Young Lee
  • JPJoo-Eon Park
    Joo-Eon Park
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Abstract
Electrical and Mechanical Properties of Epoxy/Micro-sized Alumina Composite and the Effect of Nano-sized Alumina on Those Properties Electrical insulation breakdown strength;Epoxy/alumina composite;Gas insulated switchgear (GIS);Weibull statistical analysis; Epoxy/micro-sized alumina composite was prepared and the effects of alumina content on the electrical and mechanical properties were investigated in order to develop an insulation material for gas insulated switchgear (GIS). Nano-sized alumina (average particle size: 30 μm) was also incorporated into the epoxy/micro-sized alumina composite. An electrical insulation breakdown strength test was carried out in sphere-sphere electrodes and the data were estimated by Weibull statistical analysis. Tensile strength was measured at a crosshead speed of 10 mm/min using a universal testing machine. Alumina content was varied from 0 wt% to 70 wt%.). As micro-sized alumina content increased, insulation breakdown strength increased until 40 wt% alumina content and decreased after that content. The tensile strength of a neat epoxy system was 82.2 MPa and that value for 60 wt% alumina content was 91.8 MPa, which was 111.7% higher than inthe neat epoxy system. The insulation breakdown strength of micro-sized alumina (60 wt%)/nano-sized alumina (1 phr) glycerol diglycidyl ether (GDE) (1 phr) composite was 54.2 MPa, which was 116% higher than the strength of the system without nano-sized alumina.

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