A kind of mg-ag-al ternary hydrogen storage alloy and its preparation method

A hydrogen storage alloy and alloy technology, applied in the field of hydrogen storage technology and materials, can solve the problems that are not conducive to improving the thermodynamic properties of magnesium hydride, the preparation of multi-element magnesium-based hydrogen storage alloys, and the large difference in the melting point of alloy elements, so as to save the preparation cost , Dehydrogenation thermodynamic performance improvement, the effect of easy alloy composition

Active Publication Date: 2017-06-20
SOUTH CHINA UNIV OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the preparation of magnesium alloys, due to the large difference in the melting points of alloying elements, it is impossible to prepare multi-element magnesium-based hydrogen storage alloys in one step by smelting.
Stable intermetallic compounds are easily formed between some alloying elements, which are not conducive to improving the thermodynamic properties of magnesium hydrides, so it is not suitable to prepare multi-component magnesium-based hydrogen storage alloys in one step by ball milling or sintering

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of mg-ag-al ternary hydrogen storage alloy and its preparation method
  • A kind of mg-ag-al ternary hydrogen storage alloy and its preparation method
  • A kind of mg-ag-al ternary hydrogen storage alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of the Mg-Ag-Al ternary hydrogen storage alloy of the present invention comprises the following steps:

[0035] (1) Take Mg powder and Ag powder by alloy composition, configure sample A;

[0036] (2) The obtained sample A is mixed on a ball mill;

[0037] (3) Sintering the mixed powder obtained in step (2) in a vacuum tube furnace with argon protection to obtain sample B;

[0038] (4) take by weighing the sample B that Al powder and step (3) obtain by alloy composition, configure sample C;

[0039] (5) Finally, the uniformly mixed sample C was ball-milled under an argon atmosphere to obtain a Mg-Ag-Al ternary alloy.

[0040] The protection air pressure of sintering in the step (3) of the present invention is 250~350Pa, and the sintering temperature is 550~650 ℃, and the sintering time is 16~24h; In the step (5), the protection pressure of ball milling is 0.80~1.30 atmospheric pressure, and the ball mill rotating speed is 240~360rpm, ball powder...

Embodiment 1

[0044] Mg powder with a purity of 99.8% and Ag powder with a purity of 99.9% are mixed according to a molar ratio of 80:15, mixed on a planetary ball mill, and the obtained mixed powder is placed in a crucible and placed in a vacuum tube furnace to pass Argon protection sintering for 20 hours, the sintering temperature is 600°C, and the protection pressure is 300Pa; then the Al powder with a purity of 99.95% and the powder obtained by sintering are mixed according to the molar ratio of 95:5, and then the above mixed powder is mixed under an argon atmosphere Ball milling, the ball milling time is 20h, the ball powder mass ratio is 20:1, the rotating speed is 300rpm, and the protection pressure is 1 atmosphere; the final composition is Mg 80 Ag 15 al 5 Ternary hydrogen storage alloy.

[0045] The phase composition of the alloy after ball milling is Mg(Al) solid solution and (Mg,Al) 54 Ag 17 Solid solution, after hydrogenation to form MgH 2 and (Mg,Al)Ag solid solution phase...

Embodiment 2

[0047] Mix the Mg powder with a purity of 99.8% and the Ag powder with a purity of 99.9% according to a molar ratio of 85:5, mix the powder on a planetary ball mill, put the obtained mixed powder in a crucible and place it in a vacuum tube furnace to pass Argon protection sintering for 20 hours, the sintering temperature is 550°C, and the protection pressure is 300Pa; then the Al powder with a purity of 99.95% and the sintered powder are mixed according to the molar ratio of 90:10, and then the above mixed powder is ball milled under an argon atmosphere , the ball milling time is 15h, the ball powder mass ratio is 20:1, the rotating speed is 300rpm, and the protection pressure is 1 atmosphere; the final composition is Mg 85 Ag 5 al 10 Ternary hydrogen storage alloy. Such as image 3 As shown, the phase composition of the alloy after ball milling is Mg(Al) solid solution and (Mg,Al) 54 Ag 17 Solid solution, after hydrogenation to form MgH 2 , (Mg,Al)Ag solid solution and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an Mg-Ag-Al ternary hydrogen storage alloy. The composition of the hydrogen storage alloy is MgxAgyAlz, wherein x, y and z are atomic percentages of Mg, Ag and Al, the sum of x, y and z is equal to 100, x is larger than or equal to 70 and is smaller than or equal to 90, y is larger than or equal to 5 and is smaller than or equal to 15, and z is larger than or equal to 5 and is smaller than or equal to 15. The invention further discloses a preparation method of the alloy. The preparation method comprises the steps that Mg powder and Ag powder are weighed according to the alloy composition to prepare a sample A, then powder mixing is carried out on the sample A on a ball mill, and argon is introduced into a vacuum tubular furnace for protecting the obtained mixed powder for sintering treatment to obtain a sample B; Al powder and powder B are weighed according to the alloy composition to prepare a sample C, the sample C is mixed to be uniform and subjected to ball milling in the argon atmosphere to obtain the Mg-Ag-Al ternary alloy. The main phase of the alloy is a solid solution structure of magnesium. The Mg-Ag-Al ternary alloy has the advantages that reversibility is good, and hydrogen absorption and desorption activation is not needed. The plateau pressure of the alloy is significantly improved compared with pure Mg and Mg-Ag binary alloy, and the effects of lowering the heat stability of magnesium hydride and lowering hydrogen absorption and desorption temperature are achieved.

Description

technical field [0001] The invention relates to the field of hydrogen storage technology and materials, and relates to a magnesium-based hydrogen storage alloy system material, in particular to a Mg-Ag-Al ternary hydrogen storage alloy and a preparation method thereof. Background technique [0002] In the prior art, a solid-state hydrogen storage method that uses hydrogen storage materials as a medium to form hydrides through chemical reactions and store hydrogen therein is a safe and efficient hydrogen storage method. Among the known hydrogen storage materials, metal Mg is considered to be a promising solid-state hydrogen storage material due to its high hydrogen storage capacity (7.6wt.%), abundant natural resources, and low price. Poor activation performance, slow hydrogen absorption and desorption kinetics, magnesium hydride (MgH 2 ) high thermodynamic stability leads to problems such as high hydrogen absorption and desorption temperature, which limits its practical app...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/04B22F3/10B22F9/04
CPCB22F3/1007B22F9/04B22F2009/043B22F2998/10B22F2999/00C22C1/04C22C23/00B22F2201/11
Inventor 王辉卢彦杉朱敏欧阳柳章刘江文胡仁宗曾美琴
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap