| 摘要 |
PURPOSE:To obtain dielectric porcelain with high insulation resistance and excellent lifetime characteristics by containing a specific weight part calculated in terms of niobium oxide Nb2O5 as a sub-composition in a main composition composed from a range of specific mole rate expressed by xMgO-yCaO-zTiO2. CONSTITUTION:To 100 weight part of a main composition composed from a range of mole rate expressed by a formula of xMgO-yCaO-zTiO2 (x+y+ z=1.00)with values of (x, y, z) included by points a-d In table I, niobium oxide as a sub-composition is contained with a weight part of 0.5-20.0 calculated in terms of Nb2O5. When Nb2O5 is contained as a sub-composition with respective to the main composition, insulation resistance and lifetime characteristics are improved, however, it will be ineffective if the contained amount of Nb2O5 is less than 0.5 weight part to 100 weight part of the main composition, and if the contained amount of Nb2O5 is larger than 20.0 weight part to the main composition, Q is reduced to become unpractical. Wherefore, dielectric porcelain with high insulation resistance and excellent lifetime characteristics can be provided. |
