Influence of pressing pressure on microstructure and electrical characteristics of BaTiO3 ceramics
Abstract
The effects of pressing pressure on the microstructural characteristics and on electrical properties of pure barium titanate ceramic materials were investigated. The pressing pressures were in the range from 86 MPa to 150 MPa, and the sintering process was carried out at 1190 °C for 40 minutes of passing time, which corresponds to the two hours of sintering at given temperatures. The sintered samples have been exposed to a quantitative microstructural analysis in reference to the grain sizes and porosity characteristics. The section area (A), perimeter (Lp), form factor (f), numerical density (NA) and volume fraction of pores (Vv) have been determined. This analysis has shown that a slight tendency of equalizing of grain sizes is associated with the increase of initial pressing pressure. SEM microscopy has been used also for detailed examination of microstructure. The relative capacitance and resistance in function on pressure have been examined also.