Hydrogen Permeable Membrane Amorphous Stability
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Solution Overview
Problem
High-temperature hydrogen permeable membranes made of non-crystalline nickel-zirconium alloys suffer from localized crystallization during high-temperature operation, leading to reduced hydrogen-separating and permeating ability and short service life, limiting the productivity and performance of high-performance hydrogen purifiers.
Innovation Solution
The development of hydrogen permeable membranes composed of non-crystalline nickel-zirconium or zirconium-nickel alloys with specific compositions, including aluminum, vanadium, niobium, and phosphorus, which enhance high-temperature amorphous stability and hydrogen-separating and permeating ability, allowing for extended non-crystalline structure maintenance and improved performance at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature heating operation is implemented to enhance productivity, then productivity is improved, but the membrane undergoes localized crystallization causing service life to decrease
Solution Approach 1:
The patent modifies the chemical composition parameters of the alloy by adding aluminum (5-20 atom%), vanadium (0.1-5 atom%), niobium (0.1-5 atom%), and phosphorus (0.1-5 atom%) to the nickel-zirconium base alloy. These compositional changes raise the crystallization temperature and stabilize the amorphous phase, enabling the membrane to maintain its non-crystalline structure during high-temperature operation above 300°C, thus resolving the contradiction between productivity enhancement through heating and service life maintenance
Solution Approach 2:
The patent creates a multi-element composite alloy system combining nickel, zirconium, aluminum, vanadium, niobium, and phosphorus. This composite material approach leverages the synergistic effects of different elements: aluminum raises crystallization temperature, vanadium and niobium enhance strength and stabilize amorphous phase, and phosphorus further suppresses crystallization. The composite structure enables simultaneous achievement of high-temperature stability and long service life
2Productivity
If high-temperature heating is applied to improve productivity, then productivity increases, but hydrogen-separating and permeating ability deteriorates due to crystallization
Solution Approach 1:
By adjusting the alloy composition parameters, particularly adding 5-20 atom% aluminum along with vanadium, niobium, and phosphorus, the patent raises the crystallization temperature of the alloy system. This parameter change ensures that the membrane operates in the amorphous phase at high temperatures, maintaining its unique hydrogen-separating and permeating properties while enabling high-temperature heating operation for improved productivity
3Productivity
If high-temperature operation is conducted to enhance productivity, then productivity is improved, but amorphous stability deteriorates leading to crystallization
Solution Approach 1:
The patent systematically modifies the compositional parameters of the alloy by incorporating aluminum (5-20 atom%), vanadium (0.1-5 atom%), niobium (0.1-5 atom%), and phosphorus (0.1-5 atom%). These parameter changes collectively raise the crystallization temperature and enhance the thermal stability of the amorphous phase, allowing the membrane to maintain its non-crystalline structure during high-temperature operation and thereby resolve the contradiction between productivity enhancement and amorphous stability
Solution Approach 2:
The patent develops a multi-element composite alloy where each component plays a specific role in stabilizing the amorphous phase at high temperatures. Aluminum raises crystallization temperature, while vanadium, niobium, and phosphorus work synergistically to suppress crystallization and enhance structural stability. This composite material design enables the membrane to withstand high-temperature heating operation while maintaining amorphous stability and long service life
Data Source
AI summary
A hydrogen permeable membrane which has an excellent high-temperature amorphous stability and a long lifetime under high-temperature heating operation and which can be miniaturized for use in a high-performance hydrogen purifier. The hydrogen permeable membrane is made of a non-crystalline nickel-zirconium alloy or zirconium-nickel alloy composed of 44 to 75 atom % of nickel or zirconium; and 0.2 to 16 atom % of aluminum, 0.2 to 12 atom % of vanadium and/or niobium, or 0.2 to 12 atom % of niobium and 0.1 to 10 atom % of phosphorus (provided that the combined amount of niobium and phosphorus is not more than 18 atom %); with the balance being zirconium or nickel and unavoidable impurities.