Tungsten Mesh Hydrogen Filter for Embrittlement Resistance
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Solution Overview
Problem
Conventional tubular hydrogen-permeable filters made of stainless steel are prone to embrittlement.
Innovation Solution
A hydrogen-permeable filter using a tungsten mesh woven with tungsten wires, specifically a rhenium-tungsten or ruthenium-tungsten alloy wire, with a diameter of less than 40 μm, an elongation percentage greater than or equal to 5%, and a tensile strength of 1600 MPa to 2400 MPa, is developed to prevent embrittlement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If stainless steel is used for the tubular filter, then the filter can be manufactured with good workability, but embrittlement occurs easily in hydrogen environments
Solution Approach 1:
The patent changes the material parameter from stainless steel to tungsten-based material, which fundamentally alters the chemical composition and physical properties. Tungsten has superior resistance to hydrogen embrittlement compared to stainless steel, while maintaining the necessary mechanical properties for filter application. This parameter change resolves the contradiction by selecting a material that inherently resists embrittlement in hydrogen environments.
Solution Approach 2:
The patent employs composite material structure by combining tungsten powder with binder materials to create a sintered tungsten-based filter. This composite approach allows the filter to achieve both the embrittlement resistance of tungsten and the manufacturability provided by the binder material, which facilitates sintering and structural formation. The composite material resolves the contradiction between reliability and ease of manufacture.
2Manufacturing precision
If the tungsten wire diameter is reduced to increase filtering precision, then the mesh can be finer, but the wire becomes more susceptible to fracturing
Solution Approach 1:
The patent optimizes the wire diameter parameter within a specific range (10-40 μm) to balance filtering precision and wire strength. By controlling the diameter within this range and adjusting the mesh count (600-1500 mesh), the filter achieves high filtering precision while maintaining sufficient wire strength to prevent fracturing during manufacturing and use.
Solution Approach 2:
The patent applies different material compositions locally by incorporating binder materials in specific proportions (0.1-10 wt%) within the tungsten-based material. This local quality enhancement allows finer wires to maintain adequate strength while achieving the required filtering precision, as the binder material provides structural support to the thin tungsten wires.
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 tungsten mesh filter maintains high filtering performance and durability by suppressing fracturing and embrittlement, suitable for use in hydrogen environments up to 135 MPa, including hydrogen stations and fuel cell vehicles.
Implementation Method 1
a hydrogen-permeable filter according to an aspect of the present invention includes: a tungsten mesh including a plurality of tungsten wires that are woven
Data Source
AI summary
A hydrogen-permeable filter includes a tungsten mesh including a plurality of tungsten wires that are woven. For example, the plurality of tungsten wires each have an elongation percentage greater than or equal to 5%. For example, the plurality of tungsten wires each have a tensile strength greater than or equal to 1600 MPa. For example, the plurality of tungsten wires each have a diameter less than or equal to 40 μm.