Obtaining of varistor ZnO-ceramics with high breakdown voltage
A study aimed at finding approaches to producing high-voltage ZnO ceramic is presented. This involved pre-synthesis of nanosize homogeneous ceramic powders by implementing the method of combustion with sugar as fuel and followed by sintering of pressed samples in air at 925 - 950 °C. Compounds allowing to obtain ceramics at a sintering temperature of 925 °С, discharge voltage of U b = 4.5 - 4.55 kV/mm and nonlinearity factor of α = 43 - 45 have been determined.