MLCC Spacer Composition for Stronger Electrode Bonding
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with weak bonding strength between the capacitor main body and spacers, leading to potential peeling and inadequate durability when mounted.
Innovation Solution
The design includes spacers with a metal component and protective material, where the spacers are longer than the external electrodes and divided into regions with varying content ratios of protective material, ensuring strong bonding with the capacitor main body and external electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spacer is provided on the capacitor main body to suppress acoustic noise, then acoustic noise is suppressed, but the bonding strength between the capacitor main body and the spacer becomes weak causing peeling
Solution Approach 1:
The spacer is divided into multiple regions along its length, with each region having a different protective material content ratio. The first region (near the capacitor main body) has a higher protective material content ratio (30-70%) compared to the second region (10-50%), creating segmented functional zones that simultaneously provide strong bonding and acoustic noise suppression
Solution Approach 2:
Different regions of the spacer are assigned different material compositions tailored to their specific functions. The region adjacent to the capacitor main body contains more protective material for strong bonding, while the region adjacent to the external electrode contains more metal component for electrical conductivity and acoustic noise suppression
2Strength
If the spacer is made with metal component and protective material to improve bonding strength, then bonding strength increases, but the electrical conductivity and acoustic noise suppression capability may be compromised
Solution Approach 1:
The spacer employs spatially varying material composition where the metal component content ratio and protective material content ratio differ between regions. This local quality variation ensures that electrical conductivity and acoustic noise suppression are maintained in regions where these properties are critical
Solution Approach 2:
The spacer is constructed as a composite material containing both metal component (for conductivity and acoustic noise suppression) and protective material (for bonding strength). The composite structure with varying proportions in different regions optimizes the balance between contradictory requirements
Data Source
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AI summary
The present invention provides a multilayer ceramic capacitor which has high adhesion strength between an external electrode and a spacer and exhibits excellent durability when mounted. A multilayer ceramic electronic component 1 according to the present invention is provided with: a capacitor main body 1A that is provided with a multilayer body 2 and two external electrodes 3 which are disposed on two end surfaces of the multilayer body 2, are connected to an internal electrode layer 15, and extend to two main surfaces of the multilayer body 2 so as to partially cover the main surfaces; and two spacers 4 that are disposed on both end surface sides of one main surface side of the capacitor main body 1A, sandwiching the external electrodes 3 partially covering the main surfaces. The spacers 4 are longer than the external electrodes 3 covering the main surfaces, in the length direction, and each contain an intermetallic compound which contains at least one of Cu and Ni as a high melting point metal and Sn as a low melting point metal, and a protective material 6. If each of the spacers 4 is divided into two parts in the length direction along a line extending in a stacking direction, the content ratio of the protective material 6 is higher in a region that is closer to a central part of the capacitor main body 1A in the length direction than in a region that is farther from the central part of the capacitor main body 1A.