CN-122003727-A - Laminated ceramic capacitor

CN122003727ACN 122003727 ACN122003727 ACN 122003727ACN-122003727-A

Abstract

Provided is a laminated ceramic capacitor which maintains electrical characteristics and ensures sufficient mechanical strength. In a laminated ceramic capacitor (1), in a surface layer region (400), a side edge portion (16) contains a1 st segregant (133) having silicon as a main component and a long diameter of 10nm or more and 50nm or less, and a2 nd segregant (135) having silicon as a main component and a long diameter of 1 [ mu ] m or more, the 2 nd segregant (135) being present in a plurality in cross section, and in the surface layer region (400), an additive component is contained, the additive component contains at least one of zirconium, aluminum, titanium, and calcium, and the concentration of the additive component in the surface layer region (400) is higher than the concentration of the additive component in an inner region (402).

Inventors

YOSHIDA HIROYASU
Ohki tomoya

Assignees

株式会社村田制作所

Dates

Publication Date: 20260508
Application Date: 20240701
Priority Date: 20230929

Claims (4)

1. A laminated ceramic capacitor has a laminate, side edge portions, a1 st terminal electrode and a2 nd terminal electrode, The laminated body has an effective portion and an ineffective portion, wherein the 1 st internal electrode layer and the 2 nd internal electrode layer are alternately laminated with a dielectric layer formed of a ceramic dielectric, The effective portion has: the 1 st effective part main surface is a surface in the stacking direction; A2 nd effective portion main surface which is a surface opposite to the 1 st effective portion main surface; A1 st effective portion side surface which is a surface in a width direction orthogonal to the 1 st effective portion main surface and the 2 nd effective portion main surface, and from which the 1 st internal electrode layer and the 2 nd internal electrode layer are drawn; A2 nd effective portion side surface which is a surface opposite to the 1 st effective portion side surface, and from which the 1 st internal electrode layer and the 2 nd internal electrode layer are drawn; A1 st effective portion end surface which is a surface in a longitudinal direction orthogonal to the 1 st effective portion main surface, the 2 nd effective portion main surface, the 1 st effective portion side surface, and the 2 nd effective portion side surface, and which leads out the 1 st internal electrode layer, and The 2 nd effective portion end surface is the surface opposite to the 1 st effective portion end surface, the 2 nd internal electrode layer is led out, The ineffective portion is formed of a ceramic dielectric, covers the 1 st effective portion main surface and the 2 nd effective portion main surface from the lamination direction, The side edge portion covers the effective portion and the ineffective portion from the width direction, The 1 st terminal electrode covers the 1 st effective part end surface and is electrically connected with the 1 st internal electrode layer, The 2 nd terminal electrode covers the 2 nd effective part end surface and is electrically connected with the 2 nd internal electrode layer, The side edge portions constitute ridge portions, In the region of the surface layer, The side edge portion includes: a1 st segregant comprising silicon as a main component and having a major diameter of 10nm to 50nm, and The 2 nd segregation, which contains silicon as the main component and has a major diameter of 1 μm or more, A plurality of the 2 nd segregants are present, In the skin layer region, an additive component is contained, The additive component comprises at least one of zirconium, aluminum, titanium and calcium, The concentration of the additive component in the surface layer region is higher than the concentration of the additive component in the inner region.
2. The laminated ceramic capacitor according to claim 1, wherein, In the region of the surface layer in question, The 1 st segregant is present in a ratio of 8 or less per 1 square micron.
3. A laminated ceramic capacitor has a ceramic body, a1 st terminal electrode and a 2 nd terminal electrode, The ceramic body has an inner layer portion and an outer layer portion, wherein the 1 st and 2 nd inner electrode layers are alternately laminated with a dielectric layer formed of a ceramic dielectric interposed therebetween, The inner layer portion has: the 1 st inner layer main surface is a surface in the lamination direction; a2 nd inner main surface which is an opposite surface to the 1 st inner main surface; A 1 st inner layer side surface which is a surface in the width direction orthogonal to the 1 st inner layer main surface and the 2 nd inner layer main surface; A2 nd inner layer side surface which is a surface opposite to the 1 st inner layer side surface; A1 st inner layer end surface which is a surface in a longitudinal direction orthogonal to the 1 st inner layer main surface, the 2 nd inner layer main surface, the 1 st inner layer side surface and the 2 nd inner layer side surface, and which leads out the 1 st inner electrode layer, and A2 nd inner layer end surface, which is an opposite surface to the 1 st inner layer end surface, from which the 2 nd inner electrode layer is drawn, The outer layer part is formed of a ceramic dielectric and covers the 1 st inner layer part main surface and the 2 nd inner layer part main surface from the lamination direction, The 1 st terminal electrode covers the 1 st inner layer end surface and is electrically connected with the 1 st inner electrode layer, The 2 nd terminal electrode covers the 2 nd inner layer end surface and is electrically connected with the 2 nd inner electrode layer, The outer layer portion constitutes a ridge line portion, In the region of the surface layer, The outer layer portion includes: a1 st segregant comprising silicon as a main component and having a major diameter of 10nm to 50nm, and The 2 nd segregation, which contains silicon as the main component and has a major diameter of 1 μm or more, A plurality of the 2 nd segregants are present, In the skin layer region, an additive component is contained, The additive component comprises at least one of zirconium, aluminum, titanium and calcium, The concentration of the additive component in the surface layer region is higher than the concentration of the additive component in the inner region.
4. The laminated ceramic capacitor according to claim 3, wherein, In the region of the surface layer in question, The 1 st segregant is present in a ratio of 8 or less per 1 square micron.

Description

Laminated ceramic capacitor Technical Field The present invention relates to a laminated ceramic capacitor. Background As means for improving the mechanical strength of a laminated ceramic capacitor, various techniques have been proposed in which a coating treatment is performed on the surface. Patent document 1 discloses an example of a technique of forming a coating layer on a body of a ceramic electronic component. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication 2016-105488 Disclosure of Invention Problems to be solved by the invention As means for improving the mechanical strength of the laminated ceramic capacitor, it is considered to increase the temperature rise rate at the time of firing, and to densify the dielectric-containing portion (hereinafter referred to as an outer peripheral portion) of the outer periphery or the vicinity of the outer periphery of the laminated ceramic capacitor. However, if the temperature rising rate at the time of firing is increased to densify the outer peripheral portion, silica may segregate in the outer peripheral portion without being discharged. The segregated silica sometimes reduces the mechanical strength of the laminated ceramic capacitor. The silica may contain barium, rare earth elements, zirconium, aluminum, titanium, and the like. The outer peripheral portion is constituted by a side edge portion, an ineffective portion, an outer layer portion, and the like, depending on the structure of the laminated ceramic capacitor. If sintering of the ceramic is advanced to sufficiently discharge silica, there is a possibility that grain growth excessively progresses to become poor. In the case of coating a laminated ceramic capacitor, structural defects may occur depending on the operation at the time of the coating process. In addition, in the case where the thickness of the coating layer is thick, the connectivity of the terminal electrode may be reduced. In addition, in the coating process, in the case of using a dipping type slurry, the uniformity of the thickness of the coating layer may be low. Therefore, the dimensions of the laminated ceramic capacitor sometimes deviate from the tolerance range. The purpose of the present invention is to provide a laminated ceramic capacitor that maintains electrical characteristics and ensures sufficient mechanical strength. Technical scheme for solving problems A laminated ceramic capacitor of the present invention comprises a laminate body having an effective portion and an ineffective portion, wherein the effective portion has a1 st effective portion main surface and is a surface in a lamination direction, and a1 st terminal electrode and a2 nd terminal electrode are alternately laminated with a1 st internal electrode layer and a2 nd internal electrode layer interposed between dielectric layers formed of ceramic dielectrics; a2 nd effective portion main surface which is a surface opposite to the 1 st effective portion main surface; a1 st effective portion side surface which is a surface in a width direction orthogonal to the 1 st effective portion main surface and the 2 nd effective portion main surface, from which the 1 st internal electrode layer and the 2 nd internal electrode layer are drawn, a2 nd effective portion side surface which is a surface on the opposite side of the 1 st effective portion side surface, from which the 1 st effective portion main surface and the 2 nd internal electrode layer are drawn, a1 st effective portion end surface which is a surface in a length direction orthogonal to the 1 st effective portion main surface, the 2 nd effective portion main surface, the 1 st effective portion side surface and the 2 nd effective portion side surface, from which the 1 st internal electrode layer is drawn, and a2 nd effective portion end surface which is a surface on the opposite side of the 1 st effective portion end surface, the ineffective portion being formed of a ceramic dielectric, the 1 st effective portion main surface and the 2 nd effective portion being covered from the lamination direction, the side edge portion being a surface covering the 1 st effective portion main surface and the 2 nd effective portion, the side edge portion being connected to the 1 st electrode layer, the 1 st edge portion side electrode layer being formed by the electrode layer, the side edge portion being a side electrode layer, the electrode layer being connected to the 1 st edge portion, the electrode layer being formed by the edge portion, and a2 nd segregation, wherein the silicon is the main component, the length diameter is more than 10nm and less than 50nm, and the length diameter is more than 1 mu m, the 2 nd segregation is a plurality, the surface layer region contains additive components, the additive components contain at least one of zirconium, aluminum, titanium and calcium, and the concentration of the additive components in the surface layer region is higher than