Multilayer ceramic capacitor
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Solution Overview
Problem
Conventional multilayer ceramic capacitors exhibit lower high-temperature reliability, particularly at the end portions of internal electrode layers.
Innovation Solution
Incorporating a rare earth segregation region in the multilayer ceramic capacitor with a specific segregation pattern of rare earth elements and using a dielectric material comprising calcium, zirconium, or strontium with a perovskite-type structure to enhance high-temperature reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multilayer ceramic capacitors are used with standard dielectric materials and uniform rare earth distribution, then manufacturing is simple and cost-effective, but high-temperature reliability decreases particularly at end portions of internal electrode layers
Solution Approach 1:
The patent applies local quality by creating a non-uniform rare earth element distribution where the end portions of the dielectric layers have higher rare earth content than the central portions. This localized variation in composition specifically addresses the reliability issue at end portions of internal electrode layers without modifying the entire structure, thereby improving high-temperature reliability while maintaining manufacturing feasibility.
Solution Approach 2:
The patent changes the compositional parameter of rare earth element concentration across different regions of the dielectric layers. By adjusting the rare earth content parameter to be higher at end portions and lower at central portions, the patent optimizes thermal stability and prevents degradation at critical locations, thus improving high-temperature reliability.
2Reliability
If rare earth elements are uniformly distributed throughout the dielectric layers, then manufacturing process is simpler, but high-temperature reliability at end portions deteriorates
Solution Approach 1:
The patent implements local quality by specifying that rare earth elements be segregated such that end portions of dielectric layers contain higher concentrations than central portions. This localized compositional differentiation targets the specific reliability issue at end portions while maintaining a relatively simple manufacturing approach through controlled segregation during sintering.
Solution Approach 2:
The patent applies preliminary action by pre-determining the rare earth element distribution pattern before final sintering. The composition is designed in advance with higher rare earth content at end portions, and this predetermined segregation pattern is maintained through the sintering process, ensuring high-temperature reliability is built into the structure from the outset.
3Reliability
If standard dielectric materials without perovskite structure are used, then material selection is broader and manufacturing is easier, but temperature compensation capability and high-temperature stability are reduced
Solution Approach 1:
The patent changes the crystal structure parameter of the dielectric material to perovskite type, which provides inherent temperature compensation capability. This structural parameter change ensures stable capacitance characteristics across temperature ranges, particularly improving high-temperature stability, while the use of rare earth elements further enhances this effect through controlled segregation.
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 reduces or prevents a decrease in high-temperature reliability by optimizing the segregation of rare earth elements and using temperature-compensating dielectric materials, thereby enhancing the capacitor's performance under elevated temperatures.
Implementation Method 1
the multilayer body includes a rare earth segregation region in which a rare earth element is segregated
Implementation Method 2
a dielectric material of the plurality of dielectric layers includes at least one of calcium, zirconium, or strontium, and includes a perovskite-type structure
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including an effective layer-width direction-end portion, an effective layer-middle portion, and a rare earth segregation region in which a rare earth element is segregated. A relationship between a segregation amount of a rare earth element in the rare earth segregation region in the effective layer-width direction-end portion and a segregation amount of a rare earth element in the rare earth segregation region in the effective layer-middle portion is expressed as: the effective layer-middle portion>the effective layer-width direction-end portion.