Group 5 Fe-Al Alloy Hydrogen Membrane
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Solution Overview
Problem
Pd-based metal membranes for hydrogen separation are expensive and limited in improving permeability, necessitating a cost-effective alternative with enhanced hydrogen permeability and reduced hydrogen embrittlement.
Innovation Solution
A separation membrane alloying a Group 5 element, such as vanadium, with iron and aluminum, forming a body-centered cubic lattice structure, which reduces hydrogen solubility and embrittlement while maintaining high permeability and ductility, thereby suppressing fractures and achieving low-cost fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Pd-based metals are used for hydrogen separation membranes, then hydrogen permeability is improved, but cost increases and permeability improvement is limited
Solution Approach 1:
The invention changes the material composition parameters by using Group 5 element-based alloys (V, Nb, or their mixtures) combined with Fe and Al in specific proportions (5-20 atom% Fe, 5-30 atom% Al) instead of Pd-based metals. This parameter change achieves high hydrogen permeability through the BCC lattice structure while significantly reducing material cost.
Solution Approach 2:
The invention creates a composite alloy material system combining Group 5 elements with Fe and Al metals. This composite structure leverages the BCC lattice of Group 5 elements for hydrogen permeability while Fe and Al contribute to structural stability and cost-effectiveness, achieving a balance between performance and manufacturability.
2Productivity
If hydrogen solubility is increased in the membrane, then hydrogen permeability is improved, but hydrogen embrittlement fractures occur
Solution Approach 1:
The invention optimizes the alloy composition parameters to achieve a critical balance: Group 5 elements (V, Nb) provide the BCC lattice structure for hydrogen permeability, while controlled additions of Fe (5-20 atom%) and Al (5-30 atom%) reduce hydrogen solubility to prevent embrittlement. The specific compositional ranges are designed to maintain permeability while suppressing excessive hydrogen uptake that causes embrittlement.
Solution Approach 2:
The invention converts the potential harm of hydrogen embrittlement into a benefit by using Fe and Al additions to deliberately control hydrogen solubility. The Fe and Al elements, which might be considered impurities in pure Group 5 metals, are actually used to reduce hydrogen uptake to optimal levels, preventing embrittlement while maintaining the permeability benefits of the BCC lattice structure.
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 membrane exhibits excellent hydrogen permeability and durability, with hydrogen solubility reduced to levels that prevent embrittlement fractures, allowing for efficient hydrogen separation at a lower cost compared to Pd-based membranes.
Implementation Method 1
Pd-based metals form a face centered cubic ('FCC') unit cell, and selectively separate hydrogen by dissolving and diffusing the hydrogen through a space in the unit cell
Implementation Method 2
Pd-based metals form a face centered cubic ('FCC') unit cell, and selectively separate hydrogen by dissolving and diffusing the hydrogen through a space in the unit cell
Data Source
AI summary
A separation membrane including: an alloy including a Group 5 element, Fe, and Al, wherein the alloy includes a body-centered cubic lattice structure.