FIELD: chemistry.
SUBSTANCE: zinc oxide varistor ceramics comprises oxides of zinc, bismuth, antimony, cobalt and aluminum in a proportion, wt %: ZnO 85-95, Bi2O3 1.38-4.15, Sb2O3 0.96-2.9, Al2O3 1.66-4.95, Co2O3 1-3. Bismuth, antimony, cobalt and aluminum oxides have the following ratio 1.0:0.7:1.2:0.72. The resulting varistor ceramics has breakdown voltage of 4.3-4.6 kV/mm, nonlinear coefficient of 47-53 and leakage current density of 0.6-7 mA/cm2.
EFFECT: reduced eakage current density, while providing high electrical characteristics, the obtained high-voltage varistor ceramics is cheaper.
1 tbl, 4 ex
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