Multilayer Ceramic Component Floating Electrode Crack Prevention
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Solution Overview
Problem
Multilayer ceramic electronic components face reliability issues due to warpage and cracking, particularly when the cover layer thickness is reduced to achieve higher capacitance, leading to potential short circuits and performance degradation.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic main body with internal and floating electrode layers, external electrodes with a conductive metal and resin layers, where specific geometric relationships and material choices (such as silver-epoxy or copper-epoxy resin) are used to minimize crack occurrence and ensure reliable performance, even under substrate warping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cover layer thickness is reduced to achieve higher capacitance, then the capacitance performance is improved, but the reliability deteriorates due to crack occurrence under substrate warping
Solution Approach 1:
The patent introduces a floating electrode layer positioned between the internal electrode layer and the cover layer. This floating electrode layer acts as a cushioning element that can deform and absorb stress during substrate warping, preventing stress concentration at the cover layer-inner electrode interface. The floating electrode layer is designed with specific material properties and geometric parameters (thickness Te, distance Td from cover layer, gap G between electrodes) to provide optimal stress absorption while maintaining electrical insulation, thereby preventing cracks even when the cover layer is thin (Tc≤80 μm).
Solution Approach 2:
The patent employs a composite structure consisting of multiple functional layers: the cover layer (ceramic material), the floating electrode layer (conductive material with specific electrical resistance), and the internal electrode layer. This composite design allows each layer to perform its specific function - the cover layer provides mechanical protection and electrical insulation, the floating electrode layer provides stress absorption and electrical field distribution, and the internal electrode layer provides capacitance. The synergistic combination of these materials enables both thin cover layer design for high capacitance and crack resistance for reliability.
2Quantity of substance
If the cover layer is made thinner to increase capacitance, then the capacitance performance is improved, but the manufacturing precision requirements worsen due to tighter geometric constraints
Solution Approach 1:
The patent establishes specific parameter ranges and relationships to optimize performance while managing manufacturing precision: cover layer thickness Tc≤80 μm, floating electrode layer thickness Te, distance Td from cover layer to floating electrode, gap G between internal electrodes, and the geometric relationship (1.5)Lm≤G≤(L−2Lm) where Lm is the margin part length. These parameter specifications provide clear manufacturing targets and tolerance ranges, enabling precise control during production. The floating electrode layer configuration with defined geometric parameters allows the system to achieve high capacitance with Tc≤80 μm while maintaining manufacturability through well-defined geometric constraints.
3Reliability
If a conductive resin layer is added to the external electrode to prevent cracks, then the crack resistance is improved, but the device complexity increases due to additional layers and material combinations
Solution Approach 1:
The floating electrode layer serves multiple functions simultaneously: (1) It acts as a stress-absorbing cushion during substrate warping, preventing cracks in the cover layer and internal electrodes; (2) It provides electrical insulation between the internal electrode layer and the cover layer; (3) It distributes electrical fields uniformly, improving capacitance performance; (4) It serves as a structural support layer. By combining these multiple functions into a single floating electrode layer, the patent avoids the need for separate conductive resin layers and other additional components, thereby reducing device complexity while achieving improved crack resistance and reliability.
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic main body having internal and floating electrode layers laminated therein and spaced apart from each other; and external electrodes formed on ends of the ceramic main body and including a first layer including a conductive metal and a second layer formed on the first layer and including a conductive resin. When Tc is thickness of a cover layer, G is gap between internal electrodes, L1 is length from either end of the ceramic main body in a length direction thereof to an end of the first layer formed on the upper or lower surface of the ceramic main body, Te is thickness of the internal electrode, Td is distance between internal and floating electrode layers, Lm is length of a margin part of the floating electrode layer, and L is length of the ceramic main body, Tc≦̸80 μm, (1.5)Lm≦̸G≦̸(L−2Lm), and L1<Lm+(Tc+Te+Td)×cot 50° are satisfied.