Multilayer Ceramic Capacitor Electrodes Using Shape Memory Resin Layers
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Solution Overview
Problem
Multilayer ceramic electronic components face defects such as lifting or delamination of external electrodes under high temperature and vibration conditions, leading to mechanical stress and reduced reliability due to the thinness of external electrodes and the likelihood of peeling or deformation of soft terminations.
Innovation Solution
Incorporating thermosetting shape memory polymers in the resin electrode layers of the external electrodes, which exhibit a shape memory effect, to provide self-healing properties and enhance mechanical strength and adhesion, thereby preventing defects like lifting or delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a soft term such as an epoxy resin is applied to an external electrode to absorb external impacts or internal stress, then cracks caused by mechanical stress may be alleviated, but mechanical deformation such as peeling of the soft term may occur through external impacts or vibrations
Solution Approach 1:
The patent applies a composite material structure consisting of a base electrode layer and a resin electrode layer. The base electrode layer provides mechanical strength and electrical conductivity, while the resin electrode layer provides flexibility and stress absorption. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both strength and peeling resistance.
Solution Approach 2:
The patent changes the physical and chemical parameters of the resin electrode layer by selecting a resin with specific properties: glass transition temperature of -50°C to 0°C, elongation at break of 50% or more, and tensile strength of 5 MPa or more. These parameter changes enable the resin to maintain flexibility at operating temperatures while providing sufficient mechanical strength and adhesion to prevent peeling under vibration and impact.
2Volume of moving object
If the thickness of the external electrode is decreased to achieve reduced size and high capacity, then the component size is reduced, but the electrode becomes more susceptible to mechanical stress and deformation
Solution Approach 1:
The patent uses a composite electrode structure with a base electrode layer (metal or alloy) providing strength and a resin electrode layer providing flexibility. This composite approach allows the external electrode to maintain high strength-to-thickness ratio, enabling reduced component size without sacrificing electrode strength or stress resistance.
Solution Approach 2:
The patent applies different material properties to different parts of the external electrode: the base electrode layer provides local strength and conductivity where needed for electrical connection, while the resin electrode layer provides local flexibility and stress distribution on the surface. This local differentiation of material qualities allows thin electrodes to maintain overall strength while reducing component size.
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 use of thermosetting shape memory polymers in the resin electrode layers effectively addresses mechanical deformation and enhances the long-term reliability of multilayer ceramic electronic components by absorbing external impacts and maintaining electrode integrity under harsh conditions.
Implementation Method 1
the first resin electrode layer and the second resin electrode layer include a thermosetting shape memory polymer
Implementation Method 2
a method of absorbing external impacts or internal stress by applying a soft term such as an epoxy resin to an external electrode
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body including a dielectric layer and first and second internal electrodes alternately laminated with the dielectric layer interposed therebetween; a first external electrode connected to a first internal electrode; and a second external electrode connected to a second internal electrode, wherein the first external electrode includes a first base electrode layer disposed on the ceramic body and a first resin electrode layer disposed on the first base electrode layer, wherein the second external electrode includes a second base electrode layer disposed on the ceramic body and a second resin electrode layer disposed on the second base electrode layer, and wherein the first resin electrode layer and the second resin electrode layer include a shape memory polymer (e.g., a thermosetting shape memory polymer) or a polymer having properties including a property that exhibits shape memory effect.