Glass Ceramic Substrate Surface Electrode Edge Peeling Resistance
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Solution Overview
Problem
Glass ceramic substrates face issues with peeling resistance at the interface between surface electrodes and glass ceramic layers, as well as between plating layers and surface electrodes, due to insufficient bonding and exposure of glass components, leading to reduced conductivity and platability, especially in the edge portions.
Innovation Solution
A glass ceramic substrate is produced with a surface electrode configuration where the abundance ratio of non-vitreous inorganic oxide is lower in the region bordering the plating layer than in the region bordering the glass ceramic layer, achieved by applying a first conductive paste with a higher non-vitreous inorganic oxide content and a second paste with lower or no non-vitreous inorganic oxide content, specifically using Al2O3, to reduce glass exposure and enhance bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conductive paste containing non-vitreous inorganic oxide (e.g., Al2O3) is applied to form a surface electrode, then bonding strength between the electrode and glass ceramic layer is improved, but glass component exposure on the electrode surface increases, reducing conductivity and platability
Solution Approach 1:
The patent applies different non-vitreous inorganic oxide content in different regions of the conductive paste. The edge portion (peripheral region) has lower non-vitreous inorganic oxide content to prevent glass exposure and maintain conductivity, while the central portion has higher content to ensure strong bonding with the glass ceramic layer. This local differentiation resolves the contradiction between bonding strength and electrical reliability.
2Quantity of substance
If the surface electrode is made thinner in the edge portion to reduce material usage, then manufacturing cost is reduced, but peeling resistance and platability deteriorate due to increased glass exposure
Solution Approach 1:
The patent creates local quality differences in the conductive paste composition, specifically reducing non-vitreous inorganic oxide content in the edge portion while maintaining or increasing it in the central portion. This ensures that even with reduced thickness at edges, the electrode maintains adequate peeling resistance by preventing glass component exposure through optimized material composition in critical regions.
3Ease of manufacture
If uniform conductive paste composition is used throughout the surface electrode, then manufacturing process is simplified, but edge portions suffer from glass exposure reducing overall electrode performance
Solution Approach 1:
The patent changes the compositional parameters of the conductive paste, specifically the non-vitreous inorganic oxide content, to create a gradient or differentiated structure. The edge portion has lower non-vitreous inorganic oxide content (e.g., 0-10 wt%) while the central portion has higher content (e.g., 10-30 wt%). This parameter differentiation can be achieved through controlled paste formulation and application methods, balancing manufacturing feasibility with improved edge portion 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
This configuration improves peeling resistance and platability by minimizing glass exposure on the surface electrode, ensuring good conductivity and firm adhesion of the plating layer, while also improving coplanarity by reducing the contraction effects during firing.
Implementation Method 1
the glass component synthesized in the ceramic layer is drawn up into the surface electrode by the action of the ceramic powder, giving the interface between the ceramic layer and the surface electrode an irregular shape
Implementation Method 2
firing the applied paste
Data Source
AI summary
A first paste film containing a metal powder and non-vitreous inorganic oxide is formed on a glass ceramic green sheet, and a second paste film containing a metal powder is formed on the first paste film to cover at least the edge portion of the first paste film. Then the glass ceramic green sheet and the first and second paste films are fired. As a result, a surface electrode is obtained, and then a plating layer is formed on the surface electrode. The second paste film contains less non-vitreous inorganic oxide than the first paste film and the abundance ratio of the non-vitreous inorganic oxide in the surface electrode is lower in a region bordering the plating layer than in a region bordering the glass ceramic layer at least in an edge portion of the surface electrode.