| 摘要 |
PURPOSE:To make it possible to fire the title composition at a very low temperature, to use paste as an inner electrode, and to satisfy various kinds of characteristics requied for a calcined body by a method wherein the above- mentioned composition is composed of glass frit of specific weight percent and the solid solution consisting of strontium titanate and calcium titanate. CONSTITUTION:The title composition for a ceramic board is composed of glass frit of 60 to 95wt.% consisting of Al2O3 of 50 to 60wt.%, SiO2 of 25 to 30wt.%, PbO of 7.8 to 8.3wt.%, CaO of 3.3 to 3.8wt.%, B2O3 of 2.5 to 3.0wt.%, MgO of 1.1 to 1.5wt.%, Na2O of 1.1 to 1.5wt.% and K2O of 0.8 to 1.1wt.%, and the solid solution of 5 to 40wt.% consisting of strontium titanate and calcium titanate. The solid solution consists of strontium titanate of 55 to 75mol% and calcium titanate of 25 to 45mol%. In the above-mentioned constitution, the adding quantity of Al2O3 is small, and a titanate solid solution, having high reactivity with glass frit, is used. As a result, firing temperature can be decreased remarkably. |
