Multilayer Ceramic Capacitor Corner Insulation for Heat Reliability
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Solution Overview
Problem
Conventional multilayer ceramic capacitors experience a decline in high-temperature load reliability due to reduced thicknesses of dielectric and internal electrode layers, particularly at corner portions, leading to decreased performance under thermal stress.
Innovation Solution
The multilayer ceramic capacitor design incorporates a structure where manganese and magnesium segregation is unevenly distributed at corner portions, with insulating portions in these regions, and includes external electrodes connected via a fired layer and plated layers to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thicknesses of dielectric layers and internal electrode layers are reduced, then the capacitor size is reduced, but the high-temperature load reliability decreases
Solution Approach 1:
The patent applies local quality by creating insulating portions specifically at corner portions of internal electrode layers where dielectric layers have reduced thickness. This localized modification addresses the reliability issue at critical stress points without increasing the overall capacitor size, allowing thin-layer design while maintaining high-temperature load reliability through targeted insulation reinforcement at vulnerable corners
2Ease of manufacture
If the thicknesses of dielectric layers and internal electrode layers are reduced, then the manufacturing cost is reduced, but the high-temperature load reliability decreases
Solution Approach 1:
The patent implements local quality by forming insulating portions only at corner portions of internal electrode layers rather than uniformly throughout. This localized approach minimizes additional manufacturing complexity and material usage while addressing the specific reliability degradation at corner portions, thereby maintaining cost-effectiveness with thin-layer construction while improving high-temperature load reliability
3Reliability
If insulating portions are added to internal electrode layers, then the high-temperature load reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by restricting insulating portions to only the corner portions of internal electrode layers where they are most needed for reliability. This localized approach minimizes structural complexity compared to uniform insulation throughout, as the insulating portions are formed only at specific critical locations rather than across the entire electrode structure
Solution Approach 2:
The patent uses preliminary action by forming insulating portions during the electrode formation process itself, rather than adding them as a separate post-processing step. The insulating portions are created concurrently with internal electrode layer formation through controlled application of electrode paste or selective removal, integrating the reliability enhancement into the existing manufacturing flow without adding significant process 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 design effectively prevents a decline in high-temperature load reliability by ensuring consistent performance and durability under thermal stress, maintaining capacitor characteristics.
Implementation Method 1
segregation amounts of manganese and magnesium in the first region are larger than segregation amounts of manganese and magnesium in the second region
Data Source
AI summary
In a multilayer ceramic capacitor, in a cross section of a multilayer body in a plane parallel or substantially parallel to a width direction and a height direction, an effective layer portion includes a first region defined by four corner portions of the effective layer portion, and a second region defined as a region of the effective layer portion excluding the first region, segregation amounts of manganese and magnesium in the first region are larger than segregation amounts of manganese and magnesium in the second region, and portions of internal electrode layers in the first region includes insulating portions.