Porous Titanium Sintered Electrode Structure for High Permeability
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Solution Overview
Problem
Porous titanium sintered bodies face challenges in achieving high porosity, large average pore diameter, and specific surface area while maintaining structural strength, leading to suboptimal gas and liquid permeability and reaction efficiency when used as electrodes or in heat exchangers.
Innovation Solution
A porous titanium-based sintered body is produced using a crushed titanium powder with a low circularity and specific particle size distribution, sintered at a controlled temperature range to enhance porosity, pore diameter, and specific surface area, ensuring high strength and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If titanium fibers are sintered to produce a porous sintered body, then porosity is improved, but specific surface area deteriorates
Solution Approach 1:
The invention changes the particle morphology parameter from fibrous to spherical shape, and controls particle size distribution with D10≥40μm and D50=65-100μm. This parameter change enables achieving both high porosity (50-75%) and large specific surface area (0.020-0.065 m²/g) simultaneously, resolving the contradiction between porosity and specific surface area
2Manufacturing precision
If spherical titanium powder with high bulk density is sintered, then manufacturing precision is improved, but porosity deteriorates
Solution Approach 1:
The invention changes the bulk density parameter to low density (0.4-0.6 g/cm³) while maintaining spherical shape and controlling particle size distribution (D10≥40μm, D50=65-100μm). This enables achieving high porosity (50-75%) while maintaining good sintering characteristics, resolving the contradiction between manufacturing precision and porosity
3Ease of operation
If average pore diameter is increased to improve gas permeability, then fluid flow is improved, but specific surface area deteriorates
Solution Approach 1:
The invention optimizes particle size distribution parameters (D10≥40μm, D50=65-100μm) and particle morphology (circularity ≤0.85) to create an interconnected pore structure. This achieves both large average pore diameter (23-45μm) for good gas permeability and large specific surface area (0.020-0.065 m²/g), resolving the contradiction between fluid flow and surface area
4Ease of operation
If porosity is increased to improve gas permeability, then fluid flow is improved, but strength deteriorates
Solution Approach 1:
The invention optimizes particle size distribution (D10≥40μm, D50=65-100μm) and morphology (circularity ≤0.85) to achieve high porosity (50-75%) while maintaining adequate structural strength through controlled sintering, resolving the contradiction between gas permeability and strength
Solution Approach 2:
The invention uses a composite particle size distribution system with specific D10 and D50 values, creating a multi-scale pore structure that maintains both high gas permeability and structural integrity, effectively balancing fluid flow and strength requirements
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 resulting porous titanium-based sintered body achieves a porosity of 50-75%, average pore diameter of 23-45 μm, and specific surface area of 0.020-0.065 m²/g, providing improved gas and liquid permeability, reaction efficiency, and structural strength.
Implementation Method 1
a method for producing a porous titanium-based sintered body, comprising the step of placing a titanium-based powder having an average circularity of 0.85 or less and having D10 of 40 μm or more and D50 of 65 μm to 100 μm in a mold by dry process without substantially applying pressure, and the step of sintering the powder at higher than 900°C and 1000°C or lower
Data Source
Figure 1~2
AI summary
A porous titanium-based sintered body, having a porosity of 50% to 75%, an average pore diameter of 23 µm to 45 µm, and a specific surface area of 0.020 m2/g to 0.065 m2/g, and having a bending strength of 22 MPa or more. According to the present invention, a porous titanium-based sintered body having a high porosity, a large specific surface area and a large average pore diameter and thereby having good gas permeability or liquid permeability, and further having a high strength can be provided.