Ceramic Component Dual-Layer Electrode Moisture Durability
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Solution Overview
Problem
Electronic components mounted with conductive adhesives face durability issues in hot and humid environments due to electromigration and insulation resistance degradation, particularly when subjected to long-term voltage application.
Innovation Solution
An electronic component design featuring a dual-layer external electrode structure, where the first electrode layer contains copper and is dense, and the second electrode layer has a silver-palladium matrix with dispersed copper particles, improving adhesion and durability by controlling particle size and area ratios, and incorporating silicon oxide and aluminum oxide particles for enhanced moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external electrode is made dense to improve moisture resistance, then durability in hot and humid environment improves, but adhesion with conductive adhesive may be reduced
Solution Approach 1:
The patent applies local quality by creating distinct structural characteristics in different regions of the external electrode. The internal structure is designed to be dense for moisture resistance, while the surface structure incorporates specific particle distributions and void configurations to enhance adhesion with conductive adhesives. This spatial differentiation of properties allows simultaneous achievement of both moisture resistance and adhesion strength.
Solution Approach 2:
The patent employs the nested doll principle by creating a hierarchical structure where the external electrode contains multiple embedded particle phases (Cu particles, Ag-Pd matrix) within a dense ceramic matrix. The electrode structure is nested within the conductive adhesive joint, with the dense ceramic body providing moisture barrier function while the surface particle distribution provides mechanical interlocking and chemical bonding sites for the adhesive.
Data Source
AI summary
An electronic component according to the present invention is an electronic component including: a ceramic element body including an internal electrode; and an external electrode formed on an outer surface of the ceramic element body. The external electrode includes: a first electrode layer electrically connected to at least a part of the internal electrode; and a second electrode layer formed on an outside of the first electrode layer. The first electrode layer has a first conductor region containing copper, and the second electrode layer has a second conductor region including a matrix phase containing silver and palladium and copper particles dispersed in the matrix phase.