| 摘要 |
PURPOSE:To develop a bonding glass composition for dielectrics having improved airtightness and bonding strength, by blending specific amounts of PbO with Bi2O3, SiO2, Na2O and K2O, melting the resultant blend, cooling and finely pulverizing the blend. CONSTITUTION:Given amounts of PbO or Pb3O4, Bi2O3, KNO3 and NaNO3 are prepared and blended and the resultant blend is heated at 800-900 deg.C for 1-2hr and melted. The melt is then stirred, homogenized and cast on a clean iron or carbon plate and air-cooled. The cooled blend is then finely pulverized in an alumina mortar, etc., to give powder having 1-3mum average particle diameter. Thereby the aimed bonding composition having composition of 18-75wt% PbO, 15-80wt% Bi2O3, 0.2-14wt% SiO2 and 0-6wt% total of Na2O and K2O is obtained. The composition is added to a dielectric composition in producing laminated ceramic condensers, etc., to remarkably improve the adhesion to ceramic substrates.
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