Multilayer Ceramic Capacitor Base Electrode Glass Gradient Against Cracks
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Solution Overview
Problem
Multilayer ceramic capacitors are prone to cracking due to stress from thermal expansion, impact, or other factors, particularly near the tip of the external electrode, leading to potential failures in electronic devices.
Innovation Solution
The capacitors incorporate a base electrode layer with a high proportion of glass components, specifically 60% or more in certain ranges, to guide and absorb stress, reducing the likelihood of cracks by distributing mechanical load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional base electrode layer is used, then the manufacturing process is simple, but cracks occur in the multilayer body near the external electrode tip due to stress from thermal expansion or impact
Solution Approach 1:
The base electrode layer is designed with spatially varying glass component concentration: a first region with 60-80 mass% glass components near the external electrode tip, and a second region with 30-50 mass% glass components in other areas. This local quality variation allows the high-glass region to absorb stress and prevent cracks near the vulnerable tip, while the lower-glass region maintains overall structural integrity and simplicity
Solution Approach 2:
The base electrode layer uses a composite material system combining metal components (e.g., Cu, Ni, Ag) with glass components (e.g., PbO, B2O3, SiO2) in specific proportions. The composite structure leverages the stress-absorbing properties of glass and the conductive/mechanical properties of metal to simultaneously achieve crack resistance and functional performance without excessive complexity
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
This configuration effectively reduces or prevents cracks in the multilayer body, enhances moisture resistance, and maintains reliable connectivity and capacitance performance.
Implementation Method 1
a proportion of the glass component in the first side surface-side base electrode layer is about 60% or more in a first range from a tip in a vicinity of the second end surface of the first side surface-side base electrode layer to a position of a length which is about 10% of a dimension in the length direction of the first side surface-side base electrode layer
Data Source
AI summary
In a multilayer ceramic capacitor, a proportion of a glass component in a first side surface-side base electrode layer is about 60% or more in a first range from a tip in a vicinity of a second end surface of the first side surface-side base electrode layer to a position of a length which is about 10% of a dimension in a length direction of the first side surface-side base electrode layer, and a proportion of a glass component in a second side surface-side base electrode layer is about 60% or more in a second range from a tip in a vicinity of a first end surface of the second side surface-side base electrode layer to a position of a length which is about 10% of a dimension in a length direction of the second side surface-side base electrode layer.