| 摘要 |
PURPOSE:To obtain the subject porcelain composition having a high voltage- nonlinear coefficient, a high resistance to surging and a small change thereof with time by mixing a specified oxidizing agent into a specified semiconductive porcelain consisting of an Sr-Ca-Ti-O-based compound as the main component. CONSTITUTION:An objective porcelain composition prepared by mixing a semiconductive porcelain composed of 98.0-99.9mol% formula l (0<=x<=0.25; 0.996<=y<=1.003) and 0.1-2.0mol% oxide of Nb, W, Ta, In, Y or a rare earth element with 0.01-2.0wt.% formula II (M is one or more of monovalent metallic element; Y>1). By using the above-mentioned composition, the subject porcelain composition for a voltage-nonlinear resistance element having an excellent resistance to surging after application of 5000A/cm<2> surge voltage, a high nonlinear coefficient (alpha) higher than 15 and a small change of dielectric loss with time under high temperatures and high humidity, i.e. excellent in humidity- resistant properties is obtained. |
