Nonlinear resistor and process for producing the same.

摘要

A nonlinear resistor comprising a sintered body (1) containing zinc oxide as a major component and at least bismuth oxide and boron oxide and electrodes (2,3) formed thereon, said sintered body having a higher y-form bismuth oxide phase concentration in upper and/or lower surface layers (11) of the sintered body than in the inner portion of the sintered body, has stabilized properties against long-time voltage application. When the sintered body is further modified by making the y-form bismuth oxide phase concentration in the periphery portions (121) of the upper and/or lower surface layers (11) lower than that in the inner portions of the upper and/or lower surface layers, the resulting nonlinear resistor shows a higher long-duration current impulse withstand capability.