Multilayer ceramic capacitor and method for manufacturing the same

A technology of ceramic capacitors and ceramics, which is applied in the direction of laminated capacitors, capacitors, fixed capacitors, etc., can solve problems such as cracks, lower reliability of internal electrodes and external electrodes, and achieve good solderability, high-efficiency manufacturing, and connection reliability. high effect

Active Publication Date: 2016-09-28
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 th

Method used

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  • Multilayer ceramic capacitor and method for manufacturing the same
  • Multilayer ceramic capacitor and method for manufacturing the same
  • Multilayer ceramic capacitor and method for manufacturing the same

Examples

Experimental program
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Example Embodiment

[0086]

[0087] In order to confirm the importance of the multilayer ceramic capacitor of this embodiment, a conductive paste containing Sn added to a conductive paste containing Cu powder as a conductive component was used to prepare samples of sample numbers 1 to 10 in Table 1 ( Laminated ceramic capacitors).

[0088] In addition, the detailed specifications of the conductive paste are as follows.

[0089] The amount of solid content: 25vol%

[0090] Cu powder ratio in solid content: 70vol%

[0091] The ratio of glass in solid content: 25vol%

[0092] Sn ratio in solid content: 5vol%

[0093] Particle size of Cu powder: 3μm

[0094] Particle size of glass: 2μm

[0095] Composition of glass: BaO-SrO-B 2 O 3 -SiO 2 Class glass frit (glass frit is converted by oxide, BaO: 10% by weight to 50% by weight, B 2 O 3 :3wt%~30wt%, SiO 2 : 3wt%-30wt% glass)

[0096] In addition, when the samples with sample numbers 1 to 10 in Table 1 were prepared, the conductive paste was coated on the first end f...

Example Embodiment

[0128]

[0129] In addition, the thickness of the external electrode body is set to 40 μm, the thickness of the interdiffusion layer on the external electrode side is set to 10% of the thickness of the external electrode body, and the thickness of the interdiffusion layer on the internal electrode side is set to 0.2 μm to 7 μm. Except for changing within the range of, samples with sample numbers 11 to 15 in Table 2 were produced in the same manner as in the case of the samples of Experimental Example 1 (samples in Table 1).

[0130] In addition, a test to check the number of occurrence of cracks and a 0Ω discharge test were performed on each of the produced samples.

[0131] In addition, the number of cracks was inspected by grinding the sample from the side (end surface of the ceramic body on which the external electrode was formed) in the thickness direction and width direction of each sample (multilayer ceramic capacitor). The grinding was stopped at the time point (grinding dep...

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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...

Claims

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Application Information

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IPC IPC(8): H01G4/008H01G4/012H01G4/12H01G4/232H01G4/30
CPCH01G4/008H01G4/012H01G4/12H01G4/2325H01G4/30
Inventor 西坂康弘齐藤义人
Owner MURATA MFG CO LTD
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