External Conductor Glass Composition for Crack-Resistant Electronic Components
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Solution Overview
Problem
Existing electronic components are prone to cracks in the element body due to stress concentration on the edges of the external conductor, which can lead to deterioration of characteristics when the crack reaches the internal conductor.
Innovation Solution
The electronic component incorporates a glass composition in the external conductor with a specific range of SiO2 and Al2O3 content, ensuring that the external conductor separates from the element body without concentrating stress on its edges, thereby preventing cracks and maintaining connectivity with the internal conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the external conductor is disposed on the element body with conventional glass composition, then the bonding strength between external conductor and element body is sufficient, but stress concentrates on the edge of the external conductor causing cracks in the element body
Solution Approach 1:
The patent applies different glass composition ratios in different regions of the external conductor. The first region (near the end connected to internal conductor) has a glass composition with 23-40 mass% SiO2 and 5-15 mass% Al2O3 for strong bonding, while the second region (on the side surface) has a glass composition with 10-30 mass% SiO2 and 3-12 mass% Al2O3 that allows controlled separation to prevent stress concentration and cracking.
Solution Approach 2:
The patent changes the chemical composition parameters of the glass material in different regions of the external conductor. By adjusting the SiO2 and Al2O3 content ratios, the patent optimizes the bonding characteristics in the first region while enabling controlled separation behavior in the second region, thus preventing stress concentration and cracking in the element body.
2Reliability
If the second region of external conductor separates from element body under external force, then stress does not concentrate on the edge preventing cracks, but the connection between internal conductor and first region may be severed
Solution Approach 1:
The patent creates different functional zones within the external conductor by using different glass compositions in the first and second regions. The first region's composition ensures strong bonding to prevent separation and maintain connection to the internal conductor, while the second region's composition enables controlled separation to relieve stress and prevent cracking in the element body.
Solution Approach 2:
The patent divides the external conductor into functionally distinct first and second regions with different glass compositions. This segmentation allows each region to perform its specific function: the first region maintains strong bonding for electrical connection, while the second region provides stress relief through controlled separation, thus preventing both cracking and connection failure.
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 prevents cracks in the element body and maintains the integrity of the connection between the internal and external conductors, ensuring reliable performance under external forces.
Implementation Method 1
The glass composition included in the first region has a total content of SiO2 and Al2O3 of 23 mol % or more. The glass composition included in the second region has a total content of SiO2 and Al2O3 of 5 mol % or more and 20 mol % or less.
Data Source
AI summary
An element body includes a first side surface and a pair of second side surfaces adjacent to the first side surface and opposing each other. An internal conductor is disposed in the element body. An external conductor is disposed on the element body and includes a glass composition and an electrically conductive metal, the glass composition including SiO2 and Al2O3. The external conductor includes a first region disposed on the first side surface and connected to an end of the internal conductor, and a second region disposed on at least one of the pair of second side surfaces. The glass composition included in the first region has a total content of SiO2 and Al2O3 of 23 mol % or more. The glass composition included in the second region has a total content of SiO2 and Al2O3 of 5 mol % or more and 20 mol % or less.