BCC Metal Membranes with Intermetallic Diffusion Barriers
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Solution Overview
Problem
Current metallic membranes for hydrogen purification, particularly those using platinum group metals, are costly and prone to intermetallic diffusion at elevated temperatures, limiting their stability and efficiency in fusion energy systems.
Innovation Solution
Development of hydrogen-permeable, intermetallic diffusion barriers using body-centered cubic (BCC) metal membranes with group 4 nitrides like zirconium nitride (ZrN) and platinum group metals, such as palladium (Pd), to prevent interdiffusion and enhance hydrogen permeability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum group metal foils are used for hydrogen purification membranes, then hydrogen permeability is achieved, but cost becomes prohibitively expensive
Solution Approach 1:
The patent employs composite membrane structures combining BCC metal foils (such as vanadium, niobium, or tantalum) with platinum group metal catalysts, separated by an intermetallic diffusion barrier layer. This composite approach allows the use of less expensive BCC metals as the permeation medium while maintaining hydrogen separation performance, thereby reducing cost while preserving reliability.
Solution Approach 2:
The patent replaces expensive platinum group metal foils with cheaper BCC metal foils that have sufficient hydrogen permeability for the application. The BCC metals serve as the primary permeation layer, eliminating the need for costly PGM foils while maintaining the required hydrogen purification function.
2Reliability
If platinum group metal foils are used for hydrogen purification membranes, then hydrogen permeability is achieved, but intermetallic diffusion occurs at elevated temperatures
Solution Approach 1:
The patent introduces an intermetallic diffusion barrier layer as an intermediary between the BCC metal foil and the platinum group metal catalyst layer. This barrier layer prevents direct contact and intermetallic diffusion between the two metal layers at elevated temperatures, while still allowing hydrogen to permeate through the BCC metal layer. The barrier acts as a protective interface that maintains compositional stability.
Solution Approach 2:
The patent divides the membrane structure into distinct functional layers: a BCC metal foil layer for hydrogen permeation, a thin intermetallic diffusion barrier layer to prevent interdiffusion, and a platinum group metal catalyst layer for catalytic activity. This segmentation isolates the permeation function from the catalytic function, preventing harmful interactions between the layers at high temperatures.
3Ease of manufacture
If BCC metal membranes are used to reduce cost, then cost is reduced, but intermetallic diffusion barriers are required at high temperatures
Solution Approach 1:
The patent uses composite material structures where BCC metal foils are combined with platinum group metal catalysts and intermetallic diffusion barriers. This composite approach enables cost reduction through the use of cheaper BCC metals while managing the added complexity through well-defined layer architecture with specific functional assignments.
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 composite membranes achieve stable and effective hydrogen permeation up to 450°C, with prolonged operation times and improved selectivity, reducing costs and increasing the viability of fusion energy systems by using less expensive materials and minimizing tritium inventory.
Implementation Method 1
at least one hydrogen-permeable, intermetallic diffusion barrier disposed between the metal foil layer and the at least one catalyst layer
Implementation Method 2
stable and effective hydrogen permeation up to 450°C
Implementation Method 3
at least one catalyst layer comprising a platinum group metal
Data Source
AI summary
A composite metal membrane for use in hydrogen purification includes a body-centered cubic metal layer, one or more catalyst layers, and one or more hydrogen-permeable, intermetallic diffusion barriers deposited between the body-centered cubic metal layer and the one or more catalyst layers. The body-centered cubic metal layer can include a group 5 metal. The one or more hydrogen-permeable, intermetallic diffusion barriers can each include a group 4 nitride, which may be applied via reactive sputtering. The one or more catalyst layers can each include a platinum group metal. The composite metal membrane may be symmetric in configuration, with a first hydrogen-permeable, intermetallic diffusion barrier between the body-centered cubic metal layer and a first catalyst layer, and a second hydrogen-permeable, intermetallic diffusion barrier between the body-centered cubic metal layer and a second catalyst layer.