3 - Fabrication method of SrTiO3 SMD-type varistor-capacitor multifunctional device

摘要

PURPOSE: A method for manufacturing a varistor-capacitor multifunctional device is provided to simultaneously obtain varistor characteristic and capacitor characteristic of a dielectric index larger than 10000 and dielectric loss less than 5%. CONSTITUTION: A SrTiO3 SMD varistor-capacitor multifunctional device is manufactured by using Sr0.9Ca0.1TiO3 as basic material powder. The basic material powder is subjected to wet milling after Nb2O5 of 0.4-0.6 mol% is added and SiO2 of 0.1-0.3 mol% and MnO of 0.1-0.3 mol% are added. Organic vehicle is added to the basic material powder after wet milling to form slurry. The slurry is molded by a tape caster to form a ceramic sheet. After cutting the ceramic sheet, internal electrodes are printed on the ceramic sheet by Ag/Pd or Ni electrodes. Three to five ceramic sheets are deposited on and on and subjected to pre-sintering at 1100C for 1 hour. The sintered ceramic is re-oxidized in a furnace with the air at 900-1100C.