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Nb based hydrogen permeation alloy doped with special elements and preparation method thereof

A kind of element doping, a special technology, applied in metal material coating process, ion implantation plating, coating, etc., can solve the problems of palladium resource scarcity, high price, and inapplicability

Active Publication Date: 2017-06-13
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, palladium resources are very scarce and expensive, and it is urgent to develop new metal membrane materials for hydrogen separation without palladium or less palladium that are inexpensive and highly permeable to hydrogen.
Research has found that 5B group metals (Nb, V, Ta) have a higher hydrogen permeability coefficient than palladium, but the cost is much lower than that of palladium alloys, and they are very promising hydrogen separation membrane materials. The hydrogen embrittlement caused in the process is very serious and cannot be applied in actual production; alloying is an effective way to solve the hazards of hydrogen embrittlement

Method used

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  • Nb based hydrogen permeation alloy doped with special elements and preparation method thereof

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Embodiment 1

[0033] The general chemical formula of the Nb-based hydrogen permeable alloy doped with special elements is Nb 100-(x+y+z) m x N y P z ; M is one or more elements of Ti, Zr and Hf, N is one or more elements of Ni or Co; P is Cr, Fe, Cu, Al, Mo, Ru, Rh , W, Si, Mn, Sn, Zn and Mg, one or more elements, 20≤x≤30, 10≤y≤30, 5≤z≤20, 30≤x+y≤60, x , y, z are mole percent. The hydrogen permeable alloy mainly contains two phases, a hydrogen permeable phase and a hydrogen embrittlement resistant phase, and inevitably contains a small amount of certain intermetallic compound impurity phases. The invented hydrogen permeable alloy has a maximum hydrogen permeation coefficient of (4.7~5.2)×10 -8 mol·H 2 m -1 ·s -1 ·Pa -0.5, the hydrogen permeation control temperature is 523 ~ 673K, and the anti-hydrogen embrittlement effect is excellent.

[0034] The following are several specific embodiments of the present invention.

Embodiment 2

[0035] Example 2: A Nb-based crystalline hydrogen permeable alloy doped with a special element, whose composition formula is Nb 46 Zr 25 co 24 Ru 5 . The alloy sample of the present invention is prepared by vacuum arc melting method, and the purity of the raw materials used is greater than 99.9%. Arc melting is carried out under the protection of argon, and the water-cooled copper crucible is used for cooling, and the vacuum degree is 5.7×10 -3 Pa, the melting current is 1200A, the arc ignition method is high-frequency arc ignition, the melting crucible cooling method is water jacket cooling (magnetic stirring), and the button ingot sample weight is 20g. The melting process of an alloy sample was repeated 12 times, and the ingot was turned over for each repetition. A pure titanium ingot is placed inside the furnace, and the pure titanium ingot must be smelted before the alloy ingot is smelted each time, so as to absorb a small amount of residual oxygen in the furnace and ...

Embodiment 3

[0036] Example 3: A Nb-based crystalline hydrogen permeable alloy doped with a special element, whose composition formula is Nb 40 f 25 co 25 (SnSi) 10 . The alloy sample of the present invention is prepared by vacuum arc melting method, and the purity of the raw materials used is greater than 99.9%. Arc melting is carried out under the protection of argon, and the water-cooled copper crucible is used for cooling, and the vacuum degree is 4.7×10 -3 Pa, the melting current is 1200A, the arc ignition method is high-frequency arc ignition, the melting crucible cooling method is water jacket cooling (magnetic stirring), and the button ingot sample weight is 25g. The melting process of an alloy sample was repeated 15 times, and the ingot was turned over each time. A pure titanium ingot is placed inside the furnace, and the pure titanium ingot must be smelted before the alloy ingot is smelted each time, so as to absorb a small amount of residual oxygen in the furnace and mainta...

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Abstract

The invention provides a Nb based hydrogen permeation alloy doped with special elements and a preparation method thereof, the chemical general formula of the Nb based hydrogen permeation alloy doped with special elements is Nb100-(x + y + Z) MxNyPz; M is one or more than one element selected from Ti, Zr and Hf, N is one or more than one element selected from Ni or Co, P is one or more than one element selected from Cr, Fe, Cu, Al, Mo, Ru, Rh, W, Si, Mn, Sn, Zn and Mg, 20=<x=<30, 10=<y=<30, 5=<z=<20, and x, y and z are mole percentage. The preparation method comprises the following steps: cutting raw materials, cleaning raw material surface, calculating raw material composition, weighing the raw materials, and performing electric arc melting to obtain an alloy ingot. A hydrogen permeation alloy film material which has better hydrogen permeability and properties against hydrogen embrittlement and is doped with various rare earth elements can be prepared by a vacuum electric arc melting method.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a Nb-based hydrogen permeable alloy doped with special elements and a preparation method thereof. Background technique [0002] Hydrogen energy has the advantages of high efficiency, cleanness, regeneration, abundant reserves, wide sources, and high energy density. It has broad application prospects in semiconductors, fine chemicals, aerospace, fuel cells, and many other fields. It is an ideal secondary energy source. To become an important new energy system in the 21st century, many countries in the world are actively developing hydrogen energy, taking the development of hydrogen energy economy as a long-term goal. The source of hydrogen is very diverse. In addition to electrolysis of water to produce hydrogen, the extraction of hydrogen from industrial by-products (such as chlor-alkali, synthetic ammonia, coke oven gas, etc.) is also an effective way to obtain hydrogen;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/02C22C30/00C22C1/02C23C14/14C23C14/35C23C14/02
CPCC22C1/02C22C27/02C22C30/00C23C14/02C23C14/14C23C14/35
Inventor 石锋
Owner SHANDONG UNIV OF SCI & TECH
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