| 摘要 |
PURPOSE:To reduce the rate of change of varistor voltage, and improve surge durability, charging life, etc., by adopting a specified composition. CONSTITUTION:Bismuth of 0.3-1.2mol% converted into Bi2O3, antimony of 0.3-1.5mol% converted into Sb2O3, chromium of 0.3-1.5mol% converted into Cr2O3, cobalt of 0.3-1.5mol% converted into Co2O3, and manganese of 0.2-0.8mol% converted into MnO2 are contained. Further silicon of 0.6-3.0mol% converted into SiO2, nickel of 0.3-2.5mol% converted into NiO, aluminum of 0.002-0.02mol% converted into Al2O3, and boron of 0.0001-0.05mol% converted into B2O3 are contained. Silver of 0.0001-0.05mol% converted into Ag2O, and at least either potassium of 0.0005-0.015mol% converted into K2O or sodium of 0.0005-0.015mol% converted into Na2O are contained. The residual is formed of zinc oxide. |
