Multilayer ceramic capacitor and method for manufacturing the same

Abstract

A multilayer ceramic capacitor and method of manufacturing same are provided; the multilayer ceramic capacitor contains Ni in internal electrodes, and includes a sintered metal layer containing Cu in external electrodes. At a joined portion between each internal electrode and each external electrode, mutual diffusion layers of Cu and Ni extend across the internal and external electrodes. On each internal electrode, a mutual diffusion layer is present with a thickness t1, which is defined by a dimension from a first end surface or a second end surface to an interior end in a longitudinal direction, not smaller than about 0.5 um and not greater than about 5 um. On each external electrode, a mutual diffusion layer is present with a thickness t2, which is defined by a dimension from the first end surface or the second end surface to an exterior end in the longitudinal direction, not smaller than about 2.5% and not greater than about 33.3% of a thickness t0 of a sintered metal layer.

Description

technical field [0001] The present invention relates to a ceramic capacitor and a method of manufacturing the same. More specifically, it relates to a multilayer ceramic capacitor having a structure in which an external electrode is arranged on a ceramic body having internal electrodes so as to be electrically connected to the internal electrode, and a method of manufacturing the same. . Background technique [0002] As one of representative ceramic electronic components, there is a multilayer ceramic capacitor disclosed in, for example, JP-A-2006-213946. [0003] Such as Figure 4 As shown, this multilayer ceramic capacitor has a structure including a ceramic laminate (ceramic body) 110 in which a plurality of internal electrodes 102 (102a, 102b) are laminated via a ceramic layer 101 as a dielectric layer, and a A pair of external electrodes 104 (104a, 104b) provided on a pair of end faces 103 (103a, 103b) of the ceramic laminate 110, and the pair of external electrodes 10...

AI Technical Summary

Problems solved by technology

[0007] However, there is a problem in that, in the process of firing the conductive paste, the internal electrodes expand due to the diffusion of the metal material constituting the conductive paste to the internal electrode side, and when viewed from the end face side, for example, the Cracks are generated from both ends of the uppermost and lowermost internal electrodes toward the four corners of the ceramic body

In addition, there is also a problem that, when the temperature at which the conductive paste is fired is lowered in order to suppress diffusion, the bonding reliability between the internal electrodes and the external electrodes is lowered.

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