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Non-stoichiometric Zr-based AB2 type hydrogen storage alloy and preparation method thereof

A hydrogen storage alloy, non-metering technology, applied in the field of functional materials, can solve the problems of large PCT platform slope, etc., and achieve the effects of excellent hydrogen absorption kinetic performance, enhanced stable hydrogen absorption capacity, and reduced platform slope

Inactive Publication Date: 2014-03-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogen absorption at room temperature is 2.19wt.%, which is higher than that of ZrV 2 The 2.3wt.% of the alloy decreased slightly, and the slope of the PCT platform was still relatively large

Method used

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  • Non-stoichiometric Zr-based AB2 type hydrogen storage alloy and preparation method thereof
  • Non-stoichiometric Zr-based AB2 type hydrogen storage alloy and preparation method thereof
  • Non-stoichiometric Zr-based AB2 type hydrogen storage alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] This embodiment is a non-metering ratio AB 2 Type Zr-based hydrogen storage alloy is prepared from sponge Zr blocks with a purity of 99.4% and V crystals with a purity of 99.5%, and Zr:V=0.9:2, and the stated ratio is an atomic ratio.

[0033] The preparation process of this embodiment is:

[0034] Step 1, smelting. Put Zr and V with an atomic ratio of 0.9:2 into a water-cooled copper crucible at the same time, and use a vacuum non-consumable arc melting furnace to melt according to a conventional melting method. After the tungsten electrode in the vacuum non-consumable arc melting furnace is energized and the arc is started, the current is increased to 150-250A, and the Zr and V in the water-cooled copper crucible are melted for 10-20 seconds, so that the Zr and V are both melted into a liquid state . When the Zr and V are melted into a liquid state, the current is maintained for 2-3 minutes. When the power is turned off, the liquid Zr and V solidify as the furnace...

Embodiment 2

[0041] This embodiment is a non-metering ratio AB 2 Type Zr-based hydrogen storage alloy, which is prepared from sponge Zr blocks with a purity of 99.4%, Ti plates with a purity of 99.97%, and V blocks with a purity of 99.5%, and Zr:Ti:V=0.9:0.2:2, so The stated ratios are atomic ratios.

[0042] The preparation process of this embodiment is:

[0043] Step 1, smelting. Put Zr, Ti and V with an atomic ratio of 0.9:0.2:2 into a water-cooled copper crucible at the same time, and use a vacuum non-consumable arc melting furnace to melt according to a conventional melting method. After the tungsten electrode in the vacuum non-consumable arc melting furnace is energized and the arc is started, the current is increased to 150-250A, and the Zr and V in the water-cooled copper crucible are melted for 10-20 seconds, so that the Zr and V are both melted into a liquid state . When the Zr and V are melted into a liquid state, the current is maintained for 2-3 minutes. When the power is...

Embodiment 3

[0050] This embodiment is a non-metering ratio AB 2 Type Zr-based hydrogen storage alloy, which is prepared from sponge Zr blocks with a purity of 99.4%, Ti plates with a purity of 99.97%, and V chips with a purity of 99.5%, and Zr:Ti:V=0.9:0.3:2, so The stated ratios are atomic ratios.

[0051] The preparation process of this embodiment is:

[0052] Step 1, smelting. Put Zr, Ti and V with an atomic ratio of 0.9:0.3:2 into a water-cooled copper crucible at the same time, and use a vacuum non-consumable arc melting furnace to melt according to a conventional melting method. After the tungsten electrode in the vacuum non-consumable arc melting furnace is energized and the arc is started, the current is increased to 150-250A, and the Zr and V in the water-cooled copper crucible are melted for 10-20 seconds, so that the Zr and V are both melted into a liquid state . When the Zr and V are melted into a liquid state, the current is maintained for 2-3 minutes. When the power is ...

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Abstract

The invention relates to a non-stoichiometric Zr-based AB2 type hydrogen storage alloy and a preparation method thereof. The non-stoichiometric Zr-based AB2 type hydrogen storage alloy provided by the invention is based on an AB2 type Zr0.9Ti0.1V2 alloy, and the content of Ti element is changed to be a small amount or an excessive amount so as to change the stoichiometric ratio of the alloy. The atomic ratio of Zr to Ti to V is 0.9: (0-0.4): 2. As for activation of the hydrogen storage alloy provided by the invention, the full activation can be performed by only heating to 400-500 DEG C and performing dynamic vacuum degassing for 40-60min under vacuum conditions, and performing hydrogen absorption and desorption once or twice; furthermore, the hydrogen absorption dynamic performance of the alloy is excellent, the hydrogen absorption amount can achieve above 2.3wt% at room temperature, the hydrogen absorption and desorption lag effect of a ZrV2 alloy is obviously improved, the platform slope of a PCT (procalcitonin) curve is reduced, the platform width is increased, and the stable hydrogen absorption capability is enhanced.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a non-metric ratio Zr-based AB 2 type hydrogen storage alloy. Background technique [0002] In recent years, due to environmental pollution and the depletion of fossil energy, it has become a global consensus to use hydrogen, a clean energy source, to replace existing energy based on fossil fuels. Four related steps. Hydrogen storage alloy is currently the most widely used hydrogen storage material due to its large hydrogen storage capacity, no pollution, safety and reliability, and relatively mature preparation technology and process. Rare earth series, titanium series, and zirconium series have been developed. And magnesium series and many other alloy series. Zr-based hydrogen storage alloys mainly include Zr-V, Zr-Cr and Zr-Mn series, and the general formula AB can be used 2 It has Laves phase structures such as C14, C15, and C36, and has the advantages of large hydrogen...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C27/02C22C1/02C22F1/18
Inventor 张铁邦李金山张云龙薛祥义寇宏超胡锐王军唐斌
Owner NORTHWESTERN POLYTECHNICAL UNIV