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Single-phase reversible and oxidation-resistant hydrogen-storage high-entropy alloy and preparation method thereof

A high-entropy alloy and anti-oxidation technology, which is applied in the field of single-phase reversible and anti-oxidative hydrogen storage high-entropy alloys and their preparation, can solve the problem that high-entropy alloys cannot be widely used, the reversibility of the phase structure is poor, and the high-entropy alloy phase There are many kinds of problems, so as to alleviate the problem of hydrogen absorption poisoning, improve the antioxidant performance, and increase the availability.

Inactive Publication Date: 2019-01-11
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although high-entropy alloys have the advantages of high hydrogen storage capacity and high oxidation resistance, the developed high-entropy alloys have problems such as many types of phases, poor reversible cycleability of phase structures, and high stability of hydrides. Can not be popularized and applied in the field of hydrogen storage materials
[0004] Based on the above factors, although the existing hydrogen storage metals and alloy materials have the characteristics that partially meet the requirements of hydrogen storage materials, the comprehensive hydrogen storage performance is still not ideal, which greatly limits the wide application of hydrogen energy.

Method used

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  • Single-phase reversible and oxidation-resistant hydrogen-storage high-entropy alloy and preparation method thereof
  • Single-phase reversible and oxidation-resistant hydrogen-storage high-entropy alloy and preparation method thereof
  • Single-phase reversible and oxidation-resistant hydrogen-storage high-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment prepares Ti 0.2 Zr 0.2 f 0.2 Mo 0.3 Nb 0.1 Alloy, the specific steps are as follows:

[0042] a. Use Ti, Zr, Hf, Mo and Nb metal particle raw materials with a purity greater than or equal to 99.95%, according to Ti 0.2 Zr 0.2 f 0.2 Mo a Nb b The molar ratio of the alloy components is weighed, where, a = 0.3, b = 0.1, electronic balance (accuracy up to 0.1 mg) is used for weighing, the shape of the five metal particle raw materials is irregular, the maximum diameter is less than 10 mm, the surface of the metal particle raw materials presents a metallic luster, and there is no visible oxide layer;

[0043] b. Open the sample chamber; divide the five raw materials into two groups, Ti and Nb are one group, and the Nb element is placed on the upper layer and put into a small crucible in the sample chamber of the vacuum non-consumable arc melting furnace; Zr, Mo , Hf are a group, Hf, Mo elements are placed on the upper layer, and put into another ...

Embodiment 2

[0055] This embodiment prepares Ti 0.2 Zr 0.2 f 0.2 Mo 0.2 Nb 0.2 alloy, the specific implementation is basically the same as in Example 1, the main difference is that Ti 0.2 Zr 0.2 f 0.2 Mo a Nb b middle a = 0.2, b = 0.2.

[0056] The test results are as follows:

[0057] Depend on figure 1 The XRD spectrum can draw, the prepared Ti 0.2 Zr 0.2 f 0.2 Mo 0.2 Nb 0.2 The alloy is a single-phase BCC structure high-entropy alloy;

[0058] Depend on figure 2 The DSC curve can be drawn, the hydrogenated Ti 0.2 Zr 0.2 f 0.2 Mo 0.2 Nb 0.2 There is only one endothermic peak in the decomposition process of the high-entropy alloy, and the temperature at the peak is 302 o C;

[0059] Depend on image 3 The mass spectrum curve of hydrogen can be drawn, the hydrogenated Ti 0.2 Zr 0.2 f 0.2 Mo 0.2 Nb 0.2 There is only one hydrogen release peak in the decomposition process of high-entropy alloys, and the temperature at the peak is 312 o C, basically consisten...

Embodiment 3

[0063] This embodiment prepares Ti 0.2 Zr 0.2 f 0.2 Mo 0.1 Nb 0.3 alloy, the specific implementation is basically the same as in Example 1, the main difference is that Ti 0.2 Zr 0.2 f 0.2 Mo a Nb b middle a = 0.1, b = 0.3.

[0064] The test results are as follows:

[0065] Depend on figure 1 The XRD spectrum can draw, the prepared Ti 0.2 Zr 0.2 f 0.2 Mo 0.1 Nb 0.3 The alloy is a single-phase BCC structure high-entropy alloy;

[0066] Depend on figure 2 The DSC curve can be drawn, the hydrogenated Ti 0.2 Zr 0.2f 0.2 Mo 0.1 Nb 0.3 There is only one endothermic peak in the decomposition process of the high-entropy alloy, and the temperature at the peak is 332 o C;

[0067] Depend on image 3 The mass spectrum curve of hydrogen can be drawn, the hydrogenated Ti 0.2 Zr 0.2 f 0.2 Mo 0.1 Nb 0.3 There is only one hydrogen release peak in the decomposition process of high-entropy alloys, and the temperature at the peak is 350 o C, basically consistent...

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Abstract

The invention discloses a single-phase reversible and oxidation-resistant hydrogen-storage high-entropy alloy and a preparation method thereof. A component expression of the high-entropy alloy is Ti0.2Zr0.2Hf0.2MoaNbb, wherein a is larger than or equal to 0 and smaller than or equal to 0.3, b is larger than or equal to 0.1 and smaller than or equal to 0.4, and the sum of a and b is equal to 4. Thepreparation method of the high-entropy alloy comprises the following steps of (1) raw material preparation, wherein various metal particles are weighed and prepared according to the atomic percent; (2) particle mixing, wherein the raw materials are screened and classified according to melting point characteristics of metals, and then the raw materials are mixed and put into a melting furnace crucible; and (3) alloy melting, wherein the metal particles are melted through a vacuum non-consumable arc-melting furnace. The high-entropy alloy has the advantages of being single in phase, single-phase reversible in phase before and after hydrogen absorption, high in oxidation resistance, high in speed for hydrogen absorbing and releasing and the like, and has a wide application prospect in the hydrogen energy field. According to the preparation method of the high-entropy alloy, preparation is conducted through the vacuum non-consumable arc-melting furnace, and therefore the preparation methodis simple, reliable, good in safety and high in economic value.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrogen storage materials, and in particular relates to a single-phase reversible and anti-oxidation hydrogen storage high-entropy alloy and a preparation method thereof. Background technique [0002] Hydrogen energy is considered to be one of the most promising green energy sources. The wide application of hydrogen energy can not only solve the energy crisis faced by human beings, but also greatly alleviate the global environmental pollution problem. The most urgent problems to be solved for the application of hydrogen energy include hydrogen production, storage and transportation of hydrogen. For the storage and transportation of hydrogen, the storage of hydrogen in the form of solid hydride has significant advantages such as high hydrogen storage density per unit volume and high safety. At present, the hydrogen storage metals and alloys that have been developed include Ti, Zr, Mg, LaNi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/03
CPCC22C1/03C22C30/00
Inventor 申华海张鉴玮张金朝毛义武周晓松龙兴贵彭述明
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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