MLC内部電極用Niペースト特性に及ぼすBaTiO_3共材微粒子添加量の影響

概要

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We evaluated the characteristics of Ni paste used for the fabrication of internal electrodes of multilayer ceramic chip capacitors(MLCs). The effect of addition of BaTiO_3 powders to Ni paste on green density and sintering characteristics of electrode films were also evaluated. A green density of electrode film increased monotonically with an increase in the amout of BaTiO_3 powder and showed the maximum value, 5.4g/cm^3, at 15 mass% BaTiO_3. The experimental result reversed that the added BaTiO_3 particles were located into three pocket of Ni particles up to 15 mass% BaTiO_3. However, the addition of more BaTiO_3 powder(20 mass%) resulted in decreasein green density of electrode film. Because an excess addition of BaTiO_3 powder may cause random packing of BaTi1O_3 and Ni particles in electrode fims. From the measurement of shrinkage of electrode film, it was observed that the shrinkage of electrode film decreased with an increased in the amount of BaTiO_3 powder. The electrode films with 20 mass% BaTiO_3 powder showed the same tendency as monolithic BaTiO_3. The results in dicated that an addition of BaTiO_3 to Ni paste prevented a sintering of Ni particles. The similar results were observed from SEM observation on the surface of sintered electrode film.
2001-04-01