Multilayer Ceramic Capacitor External Peripheral Strength
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Solution Overview
Problem
Multilayer ceramic capacitors used in in-vehicle equipment lack enhanced external peripheral strength, which is crucial for achieving high flexural strength, as existing techniques focus primarily on internal electrode layer enhancements rather than the external peripheral portion.
Innovation Solution
Incorporating a second phase with elements like Sn, Cu, Fe, Ni, Cr, Mn, V, Al, and P at grain boundaries in the external peripheral portion of the multilayer body, achieved through a manufacturing process involving immersion in a sol containing these elements during sintering, to enhance the sintering aid effect and increase mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a second phase is added to grain boundaries in the external peripheral portion, then the sintering aid effect is enhanced and mechanical strength increases, but the manufacturing process complexity increases
Solution Approach 1:
The patent employs preliminary action by incorporating the alkaline earth metal elements (Ca, Sr, Ba) into the green sheet formulation before lamination and sintering. The elements are pre-distributed in the dielectric layer, and then concentrated at the external peripheral portion during the sintering process through controlled diffusion and phase separation. This eliminates the need for separate post-sintering deposition steps.
Solution Approach 2:
The patent utilizes parameter changes by controlling the sintering conditions (temperature, atmosphere, time) to induce the concentration of alkaline earth metal elements at the external peripheral portion. By adjusting sintering parameters, the metal elements naturally segregate and form the desired second phase at grain boundaries in the peripheral region, achieving the structural modification through thermal processing rather than complex deposition techniques.
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 significantly enhances the flexural strength of multilayer ceramic capacitors by improving the sintering and mechanical properties of the external peripheral portion, while also reducing moisture infiltration and metal migration, thereby increasing the reliability and capacitance of the components.
Implementation Method 1
immersing the pre-sintered multilayer body in a sol of a compound including at least one of Sn, Cu, Fe, Ni, Cr, Mn, V, Al and P
Implementation Method 2
completing a sintering of the pre-sintered multilayer body after immersing the pre-sintered multilayer body in the sol
Data Source
AI summary
A multilayer electronic component includes a multilayer body including a plurality of stacked dielectric layers and a plurality of internal electrode layers between adjacent dielectric layers of the plurality of stacked dielectric layers. The plurality of stacked dielectric layers each have a plurality of crystal grains including a first phase. The multilayer body defines an electrode facing portion where the plurality of internal electrode layers and the plurality of stacked dielectric layers face each other, and defines an external peripheral portion surrounding the electrode facing portion. A portion of the plurality of stacked dielectric layers in the external peripheral portion include, in at least some of grain boundaries of the plurality of crystal grains, a second phase including at least one of Sn, Cu, Fe, Ni, Cr, Mn, V, Al, and P, and the second phase is a different compound from the first phase.