PRODUCTION OF BARIUM TITANATE-BASED DIELECTRIC CERAMIC MATERIAL AND DIELECTRIC CERAMIC

摘要

PURPOSE:To produce the dielectric ceramic material excellent in thermal and mechanical characteristics without deteriorating its dielectric constant by calcining the BaCO3 and TiO2 produced with barite as the raw material to obtain BaTiO3, adding a specified oxide to the BaTiO3, forming and then sintering the mixture. CONSTITUTION:A mixture contg., by weight, =50% first barite contg. =0.2% Al2O3, 1.3% SiO2 and 96 to less than 100% BaSO4 and the balance second barite contg. 0.2% Al2O3, 1.3 to less than 3.8% SiO2 and 96 to less than 100% BaSO4 is chemically treated to produce BaCO3. The BaCO3 is mixed with TiO2, the mixture is calcined to obtain BaTiO3, specified amts. of CaSnO2 and CaZrO3 or Nb2O5 and Nd2O3 are added to the BaTiO3 powder, the oxide of an alkaline- earth metal such as SrO and MgO, the oxide of a transition metal such as Co2O3 and MnO2 and a mineralizer such as Al2O3 and SiO2 are further added, and the mixture is formed. The formed product is calcined at 1200-1300 deg.C, for example, in the air to produce a BaTiO3-based dielectric ceramic for the ceramic electronic parts such as a ceramic capacitor.