Laminated Ceramic Capacitor Sintering Gradient for Capacitance Retention
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Solution Overview
Problem
Laminated ceramic capacitors face a reduction in capacitance due to the addition of sintering agents, as the relative permittivity of these agents is lower than the main phase oxide, and insufficient densification occurs at low temperatures if the agent amount is small.
Innovation Solution
A laminated ceramic capacitor design with a ceramic layer containing a sintering agent, where the concentration of the sintering agent is higher in non-electrode parts than at the interface with internal electrode layers, promoting effective sintering and capacitance retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount of sintering agent added is increased, then the densification of ceramic layers is improved, but the capacitance is reduced
Solution Approach 1:
The patent applies local quality by creating distinct regions with different sintering agent concentrations: a first region adjacent to the internal electrode layer with lower concentration and a second region away from the electrode layer with higher concentration. This spatial differentiation allows the interface region to maintain high capacitance while the bulk region provides sufficient densification, resolving the contradiction between densification and capacitance preservation.
2Temperature
If the sintering temperature is reduced, then the manufacturing process is simplified, but the densification of ceramic layers is insufficient
Solution Approach 1:
The patent changes the concentration parameter of the sintering agent as a function of position, creating a gradient distribution rather than uniform concentration. This parameter variation enables effective sintering at lower temperatures by concentrating the sintering effect where needed (in the bulk ceramic) while minimizing the harmful impact on capacitance (at the electrode interface).
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
This design minimizes capacitance reduction while ensuring densification and high capacitance, even at low sintering temperatures, by effectively managing the distribution of sintering agents within the capacitor structure.
Implementation Method 1
addition of a sintering agent to the ceramic green sheets can promote the sintering of the ceramic powder through a low-temperature firing process
Implementation Method 2
Si (silicon), which forms the liquid phase during the firing process
Data Source
AI summary
Provided is a laminated ceramic capacitor having a capacitance less reduced by a sintering agent. A laminated ceramic capacitor according to one aspect of the invention includes a body having a first internal electrode layer, a second internal electrode layer, and a ceramic layer disposed therebetween. The ceramic layer is formed from ceramic material containing a sintering agent composed mainly of a sintering agent element. The first internal electrode layer includes an electrode part and a non-electrode part, the electrode part being formed of a sintered compact of a main component metal element, the non-electrode part being surrounded by the electrode part. The non-electrode part contains the sintering agent element. A first concentration indicating a concentration of the sintering agent element in the non-electrode part is higher than a second concentration indicating the same in an interface between the first internal electrode layer and the ceramic layer.