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A hydrogen storage high-entropy alloy based on a body-centered cubic structure and its preparation method

A high-entropy alloy, body-centered cubic technology, applied in the field of hydrogen storage high-entropy alloy materials, can solve the problems of poor activation performance, low cost, and small hydrogen absorption and desorption, and achieve broad application prospects and cost-saving effects

Active Publication Date: 2019-09-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] SUMMARY OF THE INVENTION Aiming at the problems of current hydrogen storage materials such as small amount of hydrogen absorption and desorption, poor activation performance, slow hydrogen absorption and desorption, and high cost, a high-entropy hydrogen storage based on a body-centered cubic (BCC) structure is proposed. Alloys and their preparation methods, using high-entropy alloys to form a single BCC solid solution and large lattice distortion to prepare hydrogen-storage high-entropy alloys, not only have high hydrogen storage capacity (more than 3 mass%), fast hydrogen absorption and desorption, and low cost

Method used

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  • A hydrogen storage high-entropy alloy based on a body-centered cubic structure and its preparation method
  • A hydrogen storage high-entropy alloy based on a body-centered cubic structure and its preparation method
  • A hydrogen storage high-entropy alloy based on a body-centered cubic structure and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Alloy melting involves the following steps:

[0028] Step 1: The atomic percentage of the design composition is Ti 25 Zr 25 f 25 Nb 25 , convert the determined atomic percentage of raw materials into mass percentage;

[0029] Step 2: Use a grinding wheel to remove the oxide scale on the surface of Ti, Zr, Hf and Nb respectively, cut the scale-removed raw materials into small pieces with a size not exceeding 10 mm, and weigh them with a balance (with an accuracy of 0.001 g) Proportion;

[0030] Step 3: Put the raw materials into the vacuum non-consumable vacuum electric arc furnace respectively, turn on the arc, first burn the upper layer of raw materials with a current of 150 A for 10 s, then increase the current to 350 A within 20 s, and keep it under this current for 10 s s, the upper and lower layer elements are melted together to form an alloy ingot; the alloy ingot is leaned against the wall of the water-cooled copper crucible in 4 times, and the angle with th...

Embodiment 2

[0035] Alloy melting involves the following steps:

[0036] Step 1: The atomic percentage of the design composition is Ti 20 Zr 20 f 20 Nb 20 Mo 20 , convert the determined atomic percentage of raw materials into mass percentage;

[0037] Step 2: Use a grinding wheel to remove the oxide skin on the surface of Ti, Zr, Hf, Nb and Mo respectively, cut the raw material from which the oxide skin has been removed into small pieces of no more than 10 mm, and weigh the ratio with a balance;

[0038] Step 3: Put a group of Ti and Mo, and a group of Zr, Hf and Nb respectively into the vacuum non-consumable vacuum electric arc furnace, and lean against the wall of the water-cooled copper crucible at an angle of 30° with the horizontal plane, and turn on the arc. First burn the upper layer of raw materials with a current of 180 A for 10 seconds, then increase the current to 400 A within 20 seconds, keep it under this current for 10 seconds, and repeatedly smelt 4 times to obtain two ...

Embodiment 3

[0042] Alloy melting involves the following steps:

[0043] Step 1: The atomic percentage of the design composition is Ti 20 Zr 20 f 20 Nb 20 Cr 20 , convert the determined atomic percentage of raw materials into mass percentage;

[0044] Step 2: Remove the oxide scale on the surface of Ti, Zr, Hf, Nb and Cr respectively, cut the scale-removed raw material into small pieces of no more than 10 mm, and weigh the ratio with a balance;

[0045] Step 3: Put the raw materials into the vacuum non-consumable vacuum electric arc furnace respectively. Since Cr is easy to volatilize, it is best to put it in the middle of all raw materials. Turn on the arc, first burn the upper layer of raw materials with a current of 120 A for 10 s, and then within 20 s Add the current to 330A and keep it under this current for 10 s to melt the upper and lower layer elements together to form an alloy ingot; lean the alloy ingot against the wall of the water-cooled copper crucible in 4 times, and for...

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Abstract

The invention belongs to the field of hydrogen storage materials, and relates to a hydrogen storage high-entropy alloy taking a body-centered cubic structure as the principal thing and a preparation method for the hydrogen storage high-entropy alloy. A component expression formula of high-entropy alloy is as follows: (TiaZrbNbc)xMy, wherein a is greater than or equal to 5at% and smaller than or equal to 35at%, b is greater than or equal to at5% and smaller than or equal to 35at%, c is greater than or equal to 5at% and smaller than or equal to 35at%, a+b+c is equal to x, x is greater than or equal to 15at% and smaller than or equal to 100at%, M is any one or more of Hf, Fe, Co, Cr, Mn, Ni, Mo and W; and atomic percent of each M is 0-35%, and x+y is equal to 100. The preparation method for the hydrogen storage high-entropy alloy comprises the following steps of: adopting a non-consumable vacuum electric-arc furnace to smelt to prepare alloy; and adopting suction casting to sucking alloy into a water-cooling cooper mould, thereby obtaining a high-entropy alloy rod. The high-entropy alloy has high hydrogen storage capacity (3 mass% or more) and excellent hydrogen absorption and desorption dynamic performances; when hydrogen absorption and desorption amount is great, the high-entropy alloy, in comparison with a pure element, does not need to completely purify, so that cost can be saved to a great extent. The hydrogen storage high-entropy alloy taking the body-centered cubic structure as the principal thing has the characteristics of the high-entropy alloy, and has a wide application prospect in the fields of new energy resources and transportation.

Description

technical field [0001] The invention belongs to the field of high-entropy alloys and hydrogen storage materials, and in particular relates to a hydrogen-storage high-entropy alloy material mainly with a BCC structure. Background technique [0002] At present, humans mainly rely on non-renewable energy sources such as fossil fuels (such as oil, natural gas, and coal) to meet the energy needs of modern life. According to estimates, by the middle of this century, oil resources will be exhausted. Faced with the severe challenge of traditional energy shortage, many countries are actively developing renewable energy such as solar energy, wind energy and ocean energy (including tidal energy and wave energy). At the same time, fuels such as hydrogen and methanol are used as substitutes for gasoline and diesel. also received widespread attention. [0003] Hydrogen energy, wind energy, solar energy, and ocean energy are considered to be the most promising green energy sources. In t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
Inventor 吴渊原园宋西平杨质王辉刘雄军吕昭平
Owner UNIV OF SCI & TECH BEIJING
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