Low-temperature Sintering Wide Temperature Stability Mlcc Dielectric Material

Multi-layer ceramic capacitors (MLCC) technology is faster. X7R MLCC with high dielectric constant and good temperature stability(-55℃～125℃,?C/C25℃≤±15%)is widely used. For X8R MLCC(-55℃～150℃,?C/C25℃≤±15%)research is now more ,However, in order to save cost and reduce energy consumptionin need to lower the sintering temperature of X8R ceramic material.(approximately reduced to about 1000℃).As gas wells and oil wells , we have to go measure its temperature and pressure, it has now reached a very deep (about 5,6 km), maximum working temperature can reach 200℃, this requires the MLCC to the wider temperature range with high reliability .Therefore, lower the sintering temperature and wide temperature stability of MLCC ceramic material is an important direction of development.This paper with the high Ag (Ag≥70%) of the Ag-Pd alloy as the inner electrode, BaTiO3-based MLCC ceramic material as the research object. By adjusting the formulation and processes and other means to reduce the sintering temperature, improve the range of temperature applications of MLCC. The main experimental results and conclusions are as follows:1. The effects of the glass, Cu2+, and Mg, Al on reduce the sintering temperature and dielectric properties doped BaTiO3 ceramics. The results showed that there are some effect, but the Cu2+ is the best on burning down and improvement of the dielectric properties .2. Researched the methods of improvement the insulation resistance (neutralize in excess of the electron or hole and CaZrO3 doping), found both methods have a good effect.3. The effects of the process (milling time, suppress the wafer size) and size (dopant particle size, BT base material particle size) on the dielectric properties, found the technology and particle size on dielectric properties have a large impact.4. The effects of the Nb2O5, CuNb2O6 doped BT-Nb-Zn system and MgO doped BT-Nb-Mg system on dielectric properties, found CuNb2O6 temperature characteristics can be flat, but MgO is ineffective on improvement the temperature characteristics.5. Preliminary studied the high-temperature material preparation, preparation of ceramic materials basic engineering requirements.6. Finally, laboratory wafer and factory wafer and MLCC products on dielectric properties were compared, and gived an inspection reports of MLCC products ceramic powders.