Conductive Paste Composition for Multilayer Ceramic Capacitor External Electrodes
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Solution Overview
Problem
Multilayer ceramic capacitors face reliability issues due to cracking from external impacts, particularly in high-reliability applications like electronic apparatuses and high-pressure products, where existing solutions fail to adequately absorb impacts and ensure product reliability.
Innovation Solution
A conductive paste composition is applied between the external electrode and plating layer, comprising a conductive metal powder and a resin mixture of epoxy-based, phenoxy-based, and polyvinyl formal resins, which reduces flexural modulus and enhances bonding strength, thereby absorbing external impacts and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a paste is applied between external electrode layer and plating layer to absorb external impact, then reliability is improved, but flexural modulus becomes too high causing cracks
Solution Approach 1:
The patent changes the chemical composition parameters of the resin mixture by incorporating polyvinyl formal resin (5-20 wt%), epoxy-based resin (20-30 wt%), and phenoxy-based resin (50-65 wt%). This specific parameter combination reduces the flexural modulus of the paste layer while maintaining adequate bonding strength, allowing the layer to absorb impact energy without cracking.
Solution Approach 2:
The patent uses a composite resin mixture combining three different resin types (polyvinyl formal, epoxy-based, and phenoxy-based) with conductive metal powder. This composite material approach creates a paste layer with optimized mechanical properties that balances flexibility for impact absorption with sufficient strength for structural integrity.
2Productivity
If external electrodes are miniaturized to meet demand for small and high-capacity capacitors, then productivity is improved, but reliability deteriorates due to increased susceptibility to cracks
Solution Approach 1:
The patent modifies the paste composition parameters to reduce flexural modulus, making the paste layer more flexible and better at absorbing impact energy. This allows miniaturized capacitors to maintain reliability despite smaller size and thinner external electrodes that are more susceptible to cracking.
Data Source
AI summary
There are provided a conductive paste composition for an external electrode and a multilayer ceramic electronic component fabricated using the same, the conductive paste composition for an external electrode including: a conductive metal powder; and a resin mixture including at least one resin selected from a group consisting of an epoxy-based resin and a phenoxy-based resin, and a polyvinyl formal resin.