| 摘要 |
A voltage-dependent resistor for a lightening arrester and a surge absorber comprises a sintered zinc oxide body of a composition which comprises, as additives, 0.1 to 3.0 mole percent of bismuth oxide… (Bi2O3), 0.1 to 3 mole percent of cobalt oxide… (Co2O3), 0.1 to 3 mole percent of maganese oxide… (MnO2), 0.1 to 3.0 mole percent of antimony oxide… (Sb2O3), 0.05 to 1.5 mole percent of chromium oxide… (Cr2O3), at least one member selected from the group consisting of 0.1 to 10 mole percent of silicon oxide (SiO2) and 0.1 to 3 mole percent of nickel oxide (NiO), at least one member selected from the group consisting of 0.0005 to 0.025 mole percent of aluminum oxide (Al2O3) and 0.005 to 0.025 mole percent of gallium oxide (Ga2O3), and 0.005 to 0.3 mole percent of boron oxide (B2O3), and if necessary, 0.00005 to 0.3 mole percent of silver oxide (Ag2O), with electrodes applied to opposite surfaces of the sintered body. The resistor has a non-ohmic property (voltage-dependent property) due to the bulk itself. Therefore, its C-value can be changed without impairing its n-value by changing the distance between the electrodes at opposite surfaces. |
