Multilayer Ceramic Capacitor Dummy Electrodes for Stress Relief
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Solution Overview
Problem
In the manufacture of multilayer ceramic capacitors, the step difference in electrode patterns leads to stress on the end portions of internal electrode layers, causing potential rupture and structural defects, and the outflow of metal components during firing affects electrical reliability.
Innovation Solution
Incorporating dummy electrode layers in the outer layer portions opposed to internal electrode layers to stabilize the shape and composition of internal electrode layers, thereby absorbing stress and preventing metal outflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If green sheets with printed electrode patterns are laminated and pressed, then the multilayer body structure is formed, but stress is applied to the end portions of internal electrode layers causing rupture and structural defects
Solution Approach 1:
The patent applies preliminary action by forming a relief pattern on the dielectric layer surface before lamination. This relief pattern pre-compensates for the step difference caused by printed electrode patterns, so that when green sheets are pressed during lamination, the stress is distributed evenly and the end portions of internal electrode layers are protected from excessive stretching and rupture.
2Reliability
If internal electrode layers include metal components to improve electrical characteristics, then electrical performance is enhanced, but metal component outflow occurs during firing reducing reliability
Solution Approach 1:
The patent applies preliminary anti-action by forming the relief pattern on the dielectric layer surface before the firing process. This relief structure creates a physical constraint that prevents metal component outflow from internal electrode layers during firing, counteracting the tendency of metal components to migrate and maintain both electrical characteristics and compositional stability.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including an inner layer portion in which a plurality of dielectric layers and a plurality of internal electrode layers are laminated, and outer layer portions sandwiching the inner layer portion in a lamination direction, and external electrodes provided on a surface of the multilayer body and electrically connected to the plurality of internal electrode layers. A dummy electrode layer that does not contribute to generation of capacitance is provided in a region of at least one of the outer layer portions opposed to the plurality of internal electrode layers.