Multilayer Ceramic Capacitor Insulating Layer Mountain Portion
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with structural defects and poor fixing strength due to bad adhesion between side surfaces and the ceramic applied on them, leading to reduced thermal shock resistance and difficulty in reducing external stress.
Innovation Solution
A multilayer electronic component design featuring insulating layers with specific angular configurations on side surfaces, where the insulating layer has a mountain portion on the peripheral edge and a plane portion at the central surface, with external electrodes covering the maximum width of the mountain portion, enhancing adhesion and stress resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic is baked on side surfaces of a multilayer ceramic electronic component, then the side surfaces are covered with insulating material, but electrostriction causes structural defects and adhesion is poor leading to reduced fixing strength
Solution Approach 1:
The insulating layer is designed with different local geometries: a mountain portion at the peripheral edge and a plane portion at the central area. This local differentiation allows the mountain portion to provide mechanical interlocking for strong adhesion while the plane portion maintains a flat surface for proper external electrode formation, thereby resolving the contradiction between adhesion strength and structural integrity
Solution Approach 2:
The mountain portion of the insulating layer features a curved surface with specific angle ranges (θ1: 5°-25°, θ2: 5°-25°) rather than a sharp or flat edge. This curvature design reduces stress concentration and improves adhesion between the insulating layer and external electrodes, eliminating the harmful effect of poor adhesion while maintaining structural integrity
2Ease of manufacture
If the insulating layer has a flat surface, then external electrodes can be easily formed, but adhesion between side surfaces and ceramic is poor reducing thermal shock resistance
Solution Approach 1:
The insulating layer is segmented into two distinct portions: a mountain portion at the periphery and a plane portion at the center. This segmentation allows each portion to fulfill its specific function - the mountain portion provides curved surfaces for strong adhesion and thermal shock resistance, while the plane portion provides a flat surface for easy external electrode formation
Solution Approach 2:
Different surface geometries are applied to different locations of the insulating layer. The peripheral edge has a curved mountain portion for adhesion, while the central area has a flat plane portion for electrode formation. This local quality differentiation resolves the contradiction between manufacturing ease and reliability
3Reliability
If the mountain portion angles are outside the specified range, then manufacturing is simpler, but thermal shock resistance and fixing strength are reduced
Solution Approach 1:
Specific parameter ranges are defined for the mountain portion angles (θ1: 5°-25°, θ2: 5°-25°) to optimize both thermal shock resistance and fixing strength. These parameter specifications provide clear manufacturing targets that balance reliability requirements with manufacturing feasibility, resolving the contradiction between precision and simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design provides improved thermal shock resistance and fixing strength by optimizing the adhesion between the ceramic sintered body and external electrodes, reducing deformation and improving mountability.
Implementation Method 1
when a ceramic is baked on side surfaces of a multilayer ceramic electronic component, electrostriction is easy to cause structural defects of a capacitor
Data Source
AI summary
A multilayer electronic component includes an element body having an internal electrode layer and a dielectric layer. These layers are substantially parallel to a plane including a first axis and a second axis and are alternately laminated along a third axis direction. A pair of side surfaces facing each other in the first axis direction of the element body is respectively equipped with an insulating layer. A pair of end surfaces facing each other in the second axis direction of the element body is respectively equipped with an external electrode electrically connected to the internal electrode layer. The insulating layer has a mountain portion formed on a peripheral edge of the side surface and a plane portion of a central portion of the side surface.