Abstract
This paper presents a study aimed at optimizing the composition and sintering conditions of highvoltage ZnO varistor ceramics. We demonstrate that, with allowance for the cost of starting materials, the optimal composition of high-voltage ZnO varistor ceramics is as follows (wt %): ZnO, 90; Bi2O3, 2.76; Sb2O3, 1.92; Al2O3, 3.32; and Co2O3, 2. The optimal sintering conditions are isothermal holding at a temperature of 975°C for 2 h. The ceramics thus prepared have V b = 4.5 kV/mm, α = 50, I l = 1.1 μA/cm2, density ρ = 5.67 g/cm3 (relative density of 96.1%).
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Original Russian Text © O.G. Gromov, Yu.A. Savel’ev, E.L. Tikhomirova, A.T. Belyaevskii, E.P. Lokshin, 2017, published in Neorganicheskie Materialy, 2017, Vol. 53, No. 5, pp. 542–546.
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Gromov, O.G., Savel’ev, Y.A., Tikhomirova, E.L. et al. Optimization of the composition and sintering conditions of high-voltage ZnO varistor ceramics. Inorg Mater 53, 536–539 (2017). https://doi.org/10.1134/S0020168517050089
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DOI: https://doi.org/10.1134/S0020168517050089