Multilayer Ceramic Capacitor Side Margin Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors face issues with peeling of the side margin due to insufficient adhesive strength, which is a challenge in reducing their size while maintaining mechanical strength and increasing capacitance.
Innovation Solution
The design includes a laminate structure with a central layer portion and peripheral layer portions made of ceramic material, where the side margin is also made of ceramic material with an inner and outer layer, and the content of Si in the peripheral layer portion is equal to or substantially equal to that in the inner layer, enhancing adhesive strength and preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the side margin is made thinner to expand the effective area for capacitance, then the capacitance increases and size is reduced, but the adhesive strength becomes insufficient causing the side margin to peel off
Solution Approach 1:
The patent applies local quality by making the inner layer of the side margin have the same composition as the dielectric ceramic layer, creating a localized region with enhanced adhesive properties at the interface where peeling occurs, while the outer layer maintains different properties for overall structural function
Solution Approach 2:
The side margin is constructed as a composite structure with two distinct layers: an inner layer with the same composition as the dielectric ceramic layer for strong adhesion, and an outer layer with different composition for mechanical strength and overall structural integrity
2Strength
If the side margin contains a different component to enhance mechanical strength, then the mechanical strength improves, but the adhesive strength to dielectric ceramic layers becomes insufficient causing peeling
Solution Approach 1:
The side margin is segmented into two functional layers: an inner layer matching the dielectric ceramic composition for optimal adhesion, and an outer layer with different composition for enhanced mechanical strength, allowing each layer to perform its specific function
Solution Approach 2:
Different compositional qualities are assigned to different regions of the side margin: the inner layer has composition optimized for chemical bonding with dielectric ceramic, while the outer layer has composition optimized for mechanical reinforcement
Data Source
AI summary
A multilayer ceramic capacitor includes a laminate and an external electrode, the laminate includes a central layer portion in which first and second internal electrode layers are alternately laminated with a dielectric ceramic layer therebetween, a peripheral layer portion sandwiching the central layer portion in a lamination direction and made of a ceramic material, and a side margin sandwiching the central layer portion and the peripheral layer portion in a width direction and made of a ceramic material, the side margin includes an inner layer on an innermost side in the width direction and an outer layer on an outermost side in the width direction, and an element of an additive of the ceramic material included in the peripheral layer portion is the same as an element of an additive of a ceramic material included in the inner layer.