Resin Electrode Layer for Chip Components
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Solution Overview
Problem
Chip-shaped electronic components face durability issues under high-temperature and mechanical load conditions, leading to cracks in electrode regions and ceramic substrates, which degrade their electrical characteristics.
Innovation Solution
A resin electrode layer with electroconductive fine particles, specifically a mixture of whisker-like and flake-like particles with a tetrafunctional hydroxyphenyl type epoxy resin, is used to enhance mechanical strength and adhesion, maintaining electroconductivity and preventing fractures under harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal electrode layer is used without resin, then electroconductivity is maintained, but cracks propagate through the electrode region and ceramic substrate under thermal and mechanical load
Solution Approach 1:
The patent applies composite materials by creating a resin electrode layer that combines resin material with electrically-conductive fine particles. This composite structure provides both mechanical flexibility to absorb thermal stress and electrical conductivity through the conductive particles, resolving the contradiction between reliability under load and strength against crack propagation.
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrode layer by incorporating specific ratios of different electrically-conductive fine particles (such as silver, aluminum, or copper particles) into the resin matrix. This parameter optimization ensures adequate electroconductivity while the resin binder provides mechanical strength and flexibility to prevent crack propagation under thermal and mechanical stress.
2Ease of manufacture
If the ceramic substrate is used directly with metal electrodes, then manufacturing is simplified, but cracks propagate through the ceramic substrate under temperature cycle load
Solution Approach 1:
The patent introduces a resin electrode layer as an intermediary between the metal electrodes and the ceramic substrate. This intermediate layer absorbs thermal expansion differences and mechanical stress, preventing crack propagation into the ceramic substrate while maintaining electrical connectivity, thus improving reliability without significantly complicating manufacturing.
Solution Approach 2:
The patent applies composite materials by using a resin-based electrode layer with conductive particles as an intermediate structure. This composite layer provides both mechanical compliance to protect the ceramic substrate from cracking and electrical conductivity to maintain circuit functionality, resolving the contradiction between manufacturing simplicity and reliability.
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 solution effectively suppresses void generation and delamination, ensuring high adhesive force between the electrode layer and substrate even at extreme temperatures, preventing thermal shock and thermal fatigue.
Implementation Method 1
a resin electrode layer that contains electrically-conductive fine particles
Implementation Method 2
A resin electrode layer with electroconductive fine particles, specifically a mixture of whisker-like and flake-like particles with a tetrafunctional hydroxyphenyl type epoxy resin, is used to enhance mechanical strength and adhesion
Implementation Method 3
the chip-shaped electronic component, which is capable of keeping high reliability even under harsh environments regarding temperature and mechanical load
Data Source
AI summary
One chip-shaped electronic component 100 of the present invention has a substrate 10, and a termination electrode layer 80 formed on an end face of the substrate 10. The termination electrode layer 80 is made of a mixed material that contains an electrically-conductive substance (a′) (containing carbon (a) as one type of the electrically-conductive substance (a′)), whisker-like particles (b) covered with the electrically-conductive substance (a′), flake-like particles (c) having electroconductivity, and a tetrafunctional hydroxyphenyl type epoxy resin (d) having a molecular weight of 450 or more and less than 800. In addition, a mass ratio of the flake-like particles (c) is 3/7 or more and 9 or less when the whisker-like particles (b) is assumed to be 1.


