Dielectric Composition with Al Segregation Phase for Reducing Atmosphere Sintering

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Solution Overview

Problem

It is challenging to improve the density and dielectric properties of Sr0.3Ba0.7Nb2O6 ceramics when sintered in a reducing atmosphere, as they tend to lose oxygen and reduce in strength and specific dielectric constant.

Innovation Solution

Incorporating Al-based or Si-based segregation phases into the dielectric composition, specifically composite oxide particles with formulas like (SrxBa1-x)yNb2O5+y, where the segregation phases act as sintering aids, enhancing the strength and specific dielectric constant by promoting sintering and reducing oxygen defects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If Sr0.3Ba0.7Nb2O6 ceramics are sintered in a reducing atmosphere, then the sintering process can be completed, but the density and strength deteriorate due to oxygen loss

Engineering Contradiction:

Improvesintering processVSAvoidceramic strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent introduces Al-based or Si-based segregation phases as intermediary substances that mediate between the composite oxide particles during sintering. These segregation phases act as sintering aids that facilitate densification while preventing excessive oxygen loss and maintaining structural integrity in reducing atmosphere, thus resolving the contradiction between completing sintering and maintaining strength

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite material system consisting of composite oxide particles (SrxBa1-x)yNb2O5+y combined with Al-based or Si-based segregation phases. This composite structure allows the segregation phases to provide protective effects during sintering, enabling the main composite oxide to maintain its dielectric properties and strength even when sintered in reducing atmosphere

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If Sr0.3Ba0.7Nb2O6 ceramics are sintered in a reducing atmosphere, then the sintering process can be completed, but the specific dielectric constant deteriorates due to oxygen loss

Engineering Contradiction:

Improvesintering processVSAvoidspecific dielectric constant

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The Al-based or Si-based segregation phases serve as intermediary substances that protect the composite oxide particles from excessive oxygen loss during reducing atmosphere sintering. This protection mechanism maintains the oxygen stoichiometry and crystal structure integrity, thereby preserving the high specific dielectric constant while still allowing the sintering process to complete

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

By forming a composite material system with segregation phases, the patent creates a structure where the segregation phases buffer the chemical environment during sintering, preventing degradation of the dielectric properties while enabling complete sintering in reducing atmosphere

Inventive Principle:

Principle #40Composite materials

3Temperature

If V2O5 is added to Sr0.3Ba0.7Nb2O6, then the oxide can be sintered to higher density at low temperature under atmospheric pressure, but it is difficult to improve density when sintered in reducing atmosphere

Engineering Contradiction:

Improvesintering temperatureVSAvoiddensity

Core Design Contradiction:

TemperatureVSVolume of stationary object

Solution Approach 1:

The patent changes the chemical composition parameters by replacing V2O5 with Al-based or Si-based segregation phases. This parameter change fundamentally alters the sintering behavior, enabling high density achievement in reducing atmosphere at相对较低 temperatures, whereas V2O5-based systems fail to improve density under the same 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 incorporation of Al-based or Si-based segregation phases results in higher strength and specific dielectric constants, even when fired in a reducing atmosphere, by acting as effective sintering aids and minimizing oxygen defects, thus improving the overall dielectric properties of the ceramic materials.

Implementation Method 1

the Al-based oxide functions as a good sintering aid for the above composite oxide particles

Methodology Applied

Scientific EffectSintering: Sintering

Implementation Method 2

minimizing oxygen defects

Methodology Applied

Scientific EffectReduction: Reduction

Data Source

PatentUS11396481B2Dielectric composition and electronic component

Publication Date: 2022.07.26 TDK CORP

AI summary

Provided is a dielectric composition exhibiting a high strength and a high specific dielectric constant. The dielectric composition contains composite oxide particles having a composition formula represented by (SrxBa1-x)yNb2O5+y and an Al-based segregation phase. The Al segregation phase has niobium, aluminum, and oxygen.