Electro-mechanical characterization of alumina-based porcelain insulator doped with BaTiO3 at high temperature with frequency variation

Abstract

In this article, the doping effect of BaTiO3 (0–2 wt%) on the physical, electro-mechanical and dielectric strength of prepared porcelain insulator were investigated. Green powder samples were sintered at 1350 °C with 2 h soaking time, applying uniaxial pressure techniques with a constant load of 160 MPa. The surface, morphological, elemental and phase analysis characterization was done by using scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD) to recognize the microstructure-surface property relationship of the insulator. Various characterization like physical, electro-mechanical and alternating current (AC) dielectric strength of prepared sintered porcelain composition at 1350 °C were investigated. AC dielectric behavior, conductivity, and resistivity were measured at frequencies ranging from 20 Hz to 1 MHz. AC Dielectric constant and loss value from 2 GHz to 20 GHz with frequency and temperature variation were measured. The highest recorded value of AC dielectric strength for a sample having BT (2 wt%) is 25.75 ± 0.5 kV/mm. The investigated composition having 0.5 wt% showed excellent electro-mechanical and high voltage dielectric strength as compared to the conventional porcelain insulators. © 2020 Elsevier B.V.