Multilayer Ceramic Capacitor Metal Particle Size Control
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Solution Overview
Problem
The miniaturization and multi-functionalization of electronic components, such as multilayer ceramic capacitors, lead to reliability issues due to metal or metal oxide particles in the dielectric layer causing electric field concentration and short-circuits, which existing manufacturing methods fail to adequately address.
Innovation Solution
A multilayer ceramic capacitor design where nickel particles or nickel oxide are controlled in size within the dielectric layer adjacent to side margin portions, ensuring a diameter-to-thickness ratio of 0.8 or less to prevent electric field concentration and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of internal electrodes is significantly increased to achieve miniaturization and high capacitance, then the electrode effective area increases, but metal or metal oxide particles are disposed in the dielectric layer causing electric field concentration and short-circuits
Solution Approach 1:
The patent controls the size parameter of metal particles by adjusting sintering conditions (temperature, atmosphere, time) to keep particle diameter-to-thickness ratio at 0.8 or less, preventing electric field concentration while maintaining high electrode effective area for miniaturization and high capacitance
Solution Approach 2:
The patent applies different treatments to different regions: side margin portions are formed with specific metal particle size control in the dielectric layer adjacent to them, while central regions maintain standard electrode structures, creating localized quality differences to prevent short-circuits at critical edges
2Volume of moving object
If side margin portions are separately attached to electrode exposed surfaces before sintering, then miniaturization is achieved, but metal or metal oxide particles are generated in the dielectric layer during the process
Solution Approach 1:
The patent performs preliminary control of metal particle size during the side margin portion formation process by controlling sintering conditions before final capacitor assembly, preventing harmful particle generation rather than addressing it after occurrence
Solution Approach 2:
The patent uses controlled sintering atmosphere (inert or reducing atmosphere) during side margin portion formation to prevent oxidation of metal particles and control their size, eliminating the harmful effect of metal oxide generation while achieving miniaturization
Data Source
AI summary
A multilayer ceramic capacitor includes: a ceramic body including dielectric layers and having first and second surfaces opposing each other, third and fourth surfaces connecting the first and second surfaces to each other, and fifth and sixth surfaces connected to the first to fourth surfaces and opposing each other; a plurality of internal electrodes disposed in the ceramic body, each exposed to the first and second surfaces and having one ends exposed to the third or fourth surface; and a first side margin portion and a second side margin portion disposed, respectively, on the first and second surfaces, in which a metal or a metal oxide is disposed in the dielectric layer, and a ratio of a diameter of the metal or the metal oxide to a thickness of the dielectric layer is 0.8 or less.