Dielectric Composition for High Voltage MLCCs

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Solution Overview

Problem

Barium titanate-based dielectric compositions exhibit decreased dielectric properties under high voltage environments and lack sufficient mechanical strength, particularly when subjected to high electric field intensities and stress.

Innovation Solution

A dielectric composition with a complex oxide formula AaBbC4O15+α, incorporating aluminum oxides, where A includes Ba, B includes Zr, and C includes Nb, with specific ratios and substitutions, enhancing mechanical strength and specific permittivity under high electric field conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional dielectric composition is used, then it can be manufactured, but mechanical strength is insufficient when stress is applied

Engineering Contradiction:

ImprovemanufacturabilityVSAvoidmechanical strength under stress

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent optimizes compositional parameters (a=2.50-3.50, b=0.50-1.50) and substitution ratios (x, y, z ≤ 0.50) of the complex oxide to achieve a density of 4.40 g/cm³ or more, which correlates with improved mechanical strength while maintaining ease of manufacture through standard ceramic processing

Inventive Principle:

Principle #35Parameter changes

2Reliability

If dielectric composition is used under high electric field intensity, then it must maintain dielectric property, but specific permittivity becomes low

Engineering Contradiction:

Improvedielectric property under high electric fieldVSAvoidspecific permittivity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent carefully adjusts the compositional parameters (a, b) and substitution ratios (x, y, z) of the complex oxide AaBbC4O15+α to achieve an optimal balance where the dielectric composition maintains both high specific permittivity and reliable dielectric properties under high electric field intensity conditions

Inventive Principle:

Principle #35Parameter changes

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 dielectric composition achieves high mechanical strength and specific permittivity, maintaining effective dielectric properties even under high electric field intensities, as demonstrated by the multilayer ceramic capacitor's performance.

Implementation Method 1

the dielectric composition having a high mechanical strength and a high specific permittivity under high electric field intensity

Methodology Applied

Scientific EffectDielectric property: Dielectric Permittivity

Implementation Method 2

a dielectric composition having a complex oxide represented by a general formula of AaBbC4O15+α and an oxide including aluminum

Methodology Applied

Scientific EffectComposite materials: Composite Materials

Data Source

PatentUS10964477B2Dielectric composition and electronic component

Publication Date: 2021.03.30 TDK CORP

AI summary

A dielectric composition comprising a complex oxide represented by a general formula of AaBbC4O15+α and an oxide including aluminum, in which “A” at least includes Ba, “B” at least includes Zr, and “C” at least includes Nb, “a” is 2.50 or more and 3.50 or less, and “b” is 0.50 or more, and 1.50 or less.