Zirconia Sintered Body Composition for Machinability and Light Shielding

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Solution Overview

Problem

Zirconia sintered bodies face a trade-off between machinability and light shielding ability, as increasing alumina content for light shielding worsens machinability.

Innovation Solution

A sintered body comprising zirconia with a stabilizing element content less than 3.0 mol%, featuring specific XRD peaks and properties like Vickers hardness and total light transmittance, along with a dispersed phase to enhance both machinability and light shielding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If alumina is added to increase light shielding ability, then light shielding ability is improved, but hardness increases and machinability deteriorates

Engineering Contradiction:

Improvelight shielding abilityVSAvoidmachinability

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters by limiting stabilizing element content to less than 3.0 mol% and controlling alumina content to 1-10 mass%, which resolves the contradiction between light shielding ability and machinability by finding an optimal parameter range where both requirements are satisfied

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system consisting of zirconia matrix with controlled stabilizing elements and dispersed alumina particles, where the composite structure achieves both light shielding ability from alumina and machinability from the zirconia matrix

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If alumina content is increased for light shielding, then light shielding ability is improved, but Vickers hardness increases

Engineering Contradiction:

Improvelight shielding abilityVSAvoidVickers hardness

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The patent optimizes the alumina content parameter within 1-10 mass% range and stabilizing element content below 3.0 mol%, achieving a balance where light shielding ability is sufficient while Vickers hardness remains manageable for machining applications

Inventive Principle:

Principle #35Parameter changes

3Strength

If stabilizing element content is increased to improve strength, then mechanical strength is improved, but light shielding ability deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidlight shielding ability

Core Design Contradiction:

StrengthVSIllumination intensity

Solution Approach 1:

The patent optimizes the stabilizing element content to be less than 3.0 mol%, which is sufficient to maintain mechanical strength while minimizing the negative impact on light shielding ability, allowing alumina to provide the primary light shielding function

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 solution achieves a balance between high machinability and light shielding ability, with improved mechanical strength and reduced hardness, suitable for decorative and structural applications.

Implementation Method 1

a sintered body having a peak at 2θ=34.0°±0.2° in an XRD pattern

Methodology Applied

Scientific EffectX-ray diffraction: Bragg Diffraction

Data Source

PatentUS20260008101A1Sintered body

Publication Date: 2026.01.08 TOSOH CORP

AI summary

Provided is a zirconia sintered body having both good machinability and light shielding ability. The sintered body includes zirconia containing a stabilizing element, and the content of the stabilizing element is less than 3.0 mol %. The sintered body has a peak at 2θ=34.0°±0.2° in an XRD pattern.