Multilayer Ceramic Capacitor Interface Manganese Zirconium Ratio
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Solution Overview
Problem
Multilayer ceramic capacitors using Ca, Sr, and Zr-based dielectric ceramic materials often experience peeling failures at the interface between the internal electrode layer and the dielectric layer, particularly in moisture resistance tests, due to weak adhesion.
Innovation Solution
Incorporating manganese (Mn) at the interface between the dielectric and internal electrode layers with a specific Mn/Zr molar ratio, allowing for strong interfacial bonding through oxygen ion sharing, thereby enhancing adhesion and reducing peeling defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CaZrO3-based dielectric ceramic is used for temperature compensation, then the temperature change rate of electrostatic capacitance is small and dielectric loss is small, but peeling failure occurs at the interface between internal electrode layer and dielectric layer
Solution Approach 1:
The patent applies local quality by creating a Mn-enriched region specifically at the interface between the dielectric layer and internal electrode layer. The Mn/Zr molar ratio is controlled to be 0.05-0.20 at the interface, which is higher than in the bulk dielectric layer. This localized compositional modification enhances adhesion strength at the critical interface region while preserving the temperature compensation characteristics of the bulk CaZrO3-based dielectric material.
Solution Approach 2:
The patent employs parameter changes by adjusting the Mn/Zr molar ratio at the interface to a specific range (0.05-0.20). This parameter optimization creates strong interfacial bonding through oxygen ion sharing between Mn and the internal electrode metal, thereby improving adhesion strength without compromising the temperature stability of the dielectric layer.
2Strength
If Mn is added to improve adhesion at the interface, then peeling resistance is improved, but dielectric characteristics may be affected
Solution Approach 1:
The patent confines Mn addition to the interface region only, with a Mn/Zr molar ratio of 0.05-0.20 at the interface, while maintaining the bulk dielectric composition outside this range. This localized approach ensures that Mn enhances adhesion strength through oxygen ion sharing at the interface without significantly affecting the overall dielectric characteristics and temperature compensation properties of the CaZrO3-based material.
Solution Approach 2:
The patent optimizes the Mn/Zr molar ratio parameter within a specific range (0.05-0.20) at the interface. This controlled parameter adjustment achieves the necessary adhesion improvement while preventing excessive Mn content that would degrade dielectric performance, thus balancing adhesion strength and dielectric characteristics.
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 approach effectively improves the adhesion force between the dielectric and internal electrode layers, reducing structural defects and maintaining temperature-dependent dielectric characteristics within acceptable limits, while ensuring a capacitance change rate of no more than 30 ppm/°C.
Implementation Method 1
Mn whose valence may change is disposed at the interface, and an oxygen ion is shared with internal electrode metal, so that strong interfacial bonding via the oxygen atom is able to be obtained between the dielectric layer as an oxide and the internal electrode layer as a metal
Data Source
AI summary
A multilayer ceramic capacitor includes dielectric layers and internal electrode layers provided on the dielectric layers. The dielectric layers each include a perovskite compound that includes Ca and Zr, and optionally Sr and Ti. Mn is disposed at an interface between one of the dielectric layers and one of the internal electrode layers, and a Mn/Zr molar ratio at the interface is not less than about 0.117.