Multilayer ceramic capacitor and its preparation method

Abstract

The invention relates to a multilayer ceramic capacitor and a preparation method thereof. The capacitor comprises a ceramic body and two external electrodes, wherein the ceramic body comprises a capacity forming layer and an additional layer; the capacity forming layer comprises a plurality of first capacity units and second capacity units which are alternatively stacked; each first capacity unit comprises a first capacity dielectric layer and a first capacity electrode layer; each second capacity unity comprises a second capacity dielectric layer and a second capacity electrode layer; the additional layer comprises a plurality of stacked additional units; each additional unit comprises an additional dielectric layer and an additional electrode layer; the first capacity electrode layers and the second capacity electrode layers are copper electrode layers; the additional electrode layers are nickel electrode layers; each additional electrode layer is adjacent to one of the first capacity electrode layers and the second capacity electrode layers; a projection of each additional electrode layer falls onto an adjacent first capacity electrode layer or second capacity electrode layer; and the two external electrodes are connected with the first capacity electrode layers and the second capacity electrode layers respectively. The capacitor is more convenient to sort, and the equivalent series resistance and the high frequency loss are lower.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a multilayer ceramic capacitor and a preparation method thereof. Background technique [0002] In order to reduce the cost of raw materials, multilayer ceramic capacitors have been generally base metalized, and the internal electrode material is mainly nickel. Copper, which is also a base metal, is also used as an internal electrode material due to its high electrical conductivity. [0003] In the preparation process of multilayer ceramic capacitors, it is necessary to chamfer and grind the ceramic body obtained after sintering to make the edges and corners of the ceramic body smooth, so as to facilitate the attachment of external electrodes on the ceramic body and to make the internal electrodes and external electrodes better. ground connection. The media used for grinding are commonly used alumina balls, quartz sand and alumina powder. After chamfering and grinding, capa...

AI Technical Summary

Problems solved by technology

When the size of the capacitor differs greatly from ceramic debris and various grinding media, the sorting can be completed with different mesh screens; ), 0201 (length 0.02 inches, width 0.01 inches)), its size is close to that of ceramic debris and smaller grinding media (such as quartz sand), and cannot be sorted with a screen

In this case, for nickel internal electrode multilayer ceramic capacitors, permanent magnets can be used to suck the capacitor out of the grinding medium, but the equivalent series resistance and high frequency loss of nickel internal electrode multilayer ceramic capacitors are difficult to meet high Performance requirements in the frequency field; for multilayer ceramic capacitors with copper inner electrodes, because copper cannot be attracted by magnets, it cannot be sorted and impurities need to be picked out with the naked eye, resulting in prolonged production cycles and increased labor costs

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