Porous Titanium Body Strength and Permeability via Surface Oxidation
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Solution Overview
Problem
Conventional methods for manufacturing porous metal bodies containing titanium face a trade-off between strength and air or liquid permeability, as high-pressure sintering improves strength but decreases permeability, making it difficult to achieve both high strength and sufficient permeability simultaneously.
Innovation Solution
A method involving surface oxidation of titanium-containing powder in an oxygen-containing atmosphere followed by sintering in a reduced pressure or inert atmosphere at elevated temperatures, which enhances the strength of the porous metal body while maintaining necessary permeability by promoting solid solution and diffusion of oxygen during the sintering process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If titanium-containing powder is sintered under high pressure to improve strength, then bending strength increases, but air permeability and liquid permeability decrease
Solution Approach 1:
The patent applies preliminary oxidation to the titanium-containing powder surface before sintering. By forming an oxide layer in advance through heating in an oxygen-containing atmosphere at 250°C or more for 30 minutes or more, the powder particles develop enhanced surface properties that promote strong bonding during subsequent sintering at 950°C or more, achieving high strength without requiring excessive sintering pressure that would reduce permeability
Solution Approach 2:
The patent changes the chemical state of the powder surface by oxidizing it before sintering. The oxide layer formed on the powder surface alters the bonding characteristics during sintering, enabling strong interparticle bonds to form at lower sintering pressures, thus maintaining both high strength and adequate permeability
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 allows for the production of porous metal bodies with both high strength and air or liquid permeability, overcoming the traditional contradictory relationship between these properties.
Implementation Method 1
a surface oxidizing step of heating a titanium-containing powder in an atmosphere containing oxygen at a temperature of 250° C. or more for 30 minutes or more to provide a surface-oxidized powder
Implementation Method 2
a sintering step of depositing the surface-oxidized powder in a dry process, and sintering the surface-oxidized powder by heating it in a reduced pressure atmosphere or an inert atmosphere at a temperature of 950° C. or more
Implementation Method 3
oxygen in the oxide layer on the surface of the surface-oxidized powder leads to solid solution and diffusion into the interior of the powder during the sintering, resulting in a strengthened porous metal body
Data Source
AI summary
A method for manufacturing a porous metal body according to the present invention includes: a surface oxidizing step of heating a titanium-containing powder in an atmosphere containing oxygen at a temperature of 250° C. or more for 30 minutes or more to provide a surface-oxidized powder; and a sintering step of depositing the surface-oxidized powder in a dry process, and sintering the surface-oxidized powder by heating it in a reduced pressure atmosphere or an inert atmosphere at a temperature of 950° C. or more.