| 摘要 |
PURPOSE:To enable life of a ZnO element to be estimated in a comparatively short time, by applying a voltage having <=1Hz or >=1Hz frequency. CONSTITUTION:A sample tested contains 95.0% ZnO, 0.5% Bi2O3, 1.0% Sb2O3, 0.5% Cr2O3, 0.5% MnO2, 0.5% CO2, 0.5% O3, 0.5% SiO2, 1.0% NiO2, by the molar base, they are mixed, granulated, then, formed into a disc having 64mm. diameter and 22mm. thickness by pressing, and heat treated at 1,250 deg.C for 6hr. The element thus obtained is subjected AC application having 0.1, 1, 50, 1,000, and 10,000Hz frequencies, resulting in increase of power loss W/WO at <=1Hz and >=1Hz as compared with that at 50Hz, thus permitting life of the ZnO element to be estimated in a comparatively short time by comparing the life characteristics in a usual condition with that of the life test continued in the same conditions except 50Hz. |
