AC conductivity of C130 type electroporcelain as a function of firing temperature and compaction pressure

Abstract

Dependence of the AC conductivity of the C-130 type electroporcelain on the compaction pressure was measured. The samples were manufactured from spray-dried mixtures using isostatic compaction in vacuum at 5 different pressures (70 MPa to 110 MPa, 10 MPa step size). AC conductivity measurements were performed at 25 different frequencies ranging from 50 Hz to 3 MHz at room temperature on samples with dimensions 10 × 10 × 3 mm3. In addition to the compaction pressure, the effect of different firing temperatures was studied (1100°C and 1200°C). The highest values of AC conductivity were observed in the case of the raw samples, due to an amount of physically and structurally bound water. Conductivity relaxation was observed after firing at 1200°C in all samples at 2.5 MHz. A small effect of the compaction pressure was observed for the raw samples and samples fired at 1200°C.