MLCC Dielectric Composition for Humidity-Stable Insulation
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving high insulating properties and reliability under high humidity and temperature conditions due to the formation of protrusions at the interface between dielectric layers and internal electrode layers, which deteriorate insulating properties and reliability.
Innovation Solution
The use of specific compositions for dielectric layers, including barium titanate with nickel and rare earth elements, and controlling the magnesium content within a specific region to prevent the formation of Mg—Ni protrusions, while maintaining high insulating properties and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of dielectric layers is reduced to achieve miniaturization and large capacitance, then capacitance increases, but insulation resistance between internal electrode layers deteriorates
Solution Approach 1:
The patent applies local quality by adding nickel and rare earth elements specifically to the dielectric layer composition to improve insulation resistance at critical interfaces, while maintaining thin overall layer thickness for high capacitance. This targeted compositional modification resolves the contradiction between thin dielectric layers (for high capacitance) and sufficient insulation resistance.
Solution Approach 2:
The patent uses composite materials by combining barium titanate-based dielectric layers with nickel and rare earth element additives. This composite approach enhances insulation properties while maintaining the thin layer structure needed for high capacitance, resolving the contradiction between miniaturization and reliability.
2Quantity of substance
If side margin portions are provided independently from the multilayer body, then thickness variation is reduced and capacitance increases, but manufacturing complexity increases
Solution Approach 1:
The patent merges the side margin portions with the multilayer body by forming them as an integrated structure during the same lamination and firing processes. This integration approach reduces manufacturing complexity while still achieving the benefits of reduced thickness variation and increased capacitance through optimized margin portion design.
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 approach results in multilayer ceramic capacitors with improved insulating properties and reliability under high humidity and temperature conditions, reducing capacitance variation and maintaining high capacitance.
Implementation Method 1
The dielectric layers in each of the inner layer, the first outer layer, and the second outer layer include main crystal grains including barium and titanium, and further include, with respect to 100 parts by mol of titanium, nickel in an amount of about 0.2 parts by mol or more and about 3.0 parts by mol or less, and at least one rare earth element
Data Source
AI summary
A multilayer ceramic capacitor includes a base body including first and second main surfaces, first and second side surfaces, first and second end surfaces, and dielectric layers and internal electrode layers, and external electrodes at the first and second end surfaces, and electrically connected to the internal electrode layers. The base body includes an inner layer, first and second outer layers, first and second side margin portions. The dielectric layers in the inner layer and the first and second outer layers include main crystal grains including barium and titanium, and with respect to 100 parts by mol of titanium, nickel in an amount of about 0.2 to about 3.0 parts by mol, and at least one rare earth element selected from yttrium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium in an amount of about 0.6 parts to about 2.0 parts by mol.