摘要 |
PURPOSE:To enhance dielectric constant, dielectric breakdown voltage and insulation resistance, and reduce a crystal grain diameter size to reduce dielectric substance thickness by having specific pts.wt. of Nb2O5 and MnO2 contained in 100 pts.wt. of a main component constituted within a mole ratio in a specific formula wherein (x), (y), and (z) are enclosed by points (a), (b), (c), and (d). CONSTITUTION:In 100 pts.wt. of a main component constituted within a mole ratio wherein (x), (y), and (z) are enclosed by points (a), (b), (c), and (d), as shown in the Table 1 when a general formula is expressed as xBaO-yTiO2-zCeO2 (where x+y+z=1.00), 0.3-3.0 pts.wt. of Nb2O5 and 0.05-0.25 pts.wt. of MnO2 are contained. For example, powder of high purity of BaCO3, TiO2, CeO2, Nb2O5 and MnO2 is weighed, put in a ball mill with pure water, wet-blended, dehydrated and dried. It is put in a high-alumina crucible to be calcined in the atomophere. It is put in a ball mill with pure water, wet-milled, dehydrated and dried. An organic binder is added for homogenizing and grading process is performed through a screen. A metal mold and hydraulic press are used for forming. It is put in an alumina sheath where zirconium power is laid on to obtain dielectric porcelain. |