HIGH-PERFORMANCE MULTILAYER CERAMIC CAPACITOR WITH LOW SINTERING TEMPERATURES

A low-temperature sintering MLC meeting the EIA temperature coefficien t code COG has been developed in this work. The dielectric material of MLC is based on the Bi2O3-ZnO-Nb2O5 ternary system. The dielectric co nstant of the material is about 100 and the mean particle size is arou nd 0.5 mu m. Low palladium content Ag-Pd paste was used for internal e lectrodes. SEM study was used to optimize the sintering condition. Des tructive physical analysis (DPA) and scanning laser acoustic microscop e were used to check the internal defects. Fine grain microstructure, perfect internal structure and high dielectric break-down strength (>1 000 V/mil) were obtained from the MLC. The reliability of MLC was eval uated by means of highly accelerated life test (HALT) and humidity, st eady, low voltage test (according to MIL-C-55681D). Failure rate level M (1.0 % per 1,000 hours) was achieved.