Quaternary magnesium base hydrogen storage alloy, its producing method and use

A technology of magnesium-based hydrogen storage alloy and production method, applied in the field of materials, can solve the problems of unstable performance, low practicability, and high temperature of hydrogen absorption/desorption

Inactive Publication Date: 2007-01-24
贵州佑邦科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two magnesium-based hydrogen storage alloys are prepared by mechanical ball milling alloying method to obtain alloy materials containing nanocrystalline structure, which have good hydrogen absorption / decomposition performance and electrochemical capacity up to 300mA·h·g -1 , the physical and chemical properties are significantly improved compared with binary and ternary magnesium-based hydrogen storage alloys, but its hydrogen absorption / decomposition temperature is higher (above 250 ° C), so its performance is unstable and its practicability is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) According to Mg 1.95 Al 0.05 Ni 0.92 V 0.08 Weigh the alloying element powder, mix thoroughly, and then press into flakes; put the pressed flake samples into a vacuum with a degree of 1×10 -3 Sintering in a Pa vacuum sintering furnace, the sintering temperature is 500-800°C, and the sintering time is 1.5-4 hours; then the alloy samples obtained by sintering are crushed, ball milled, and screened to obtain Mg with a particle size of less than 25 μm 1.95 Al 0.05 Ni 0.92 V 0.08 alloy powder;

[0016] (2) Press Mg 1.95 Al 0.05 Ni 0.92 V 0.08 3.5% of the alloy powder weight takes by weighing fine Ni powder and carries out ball milling, observes microstructure with x-ray diffractometer (XRD) in the ball milling process, sees whether to become nanocrystalline Ni powder, usually appears nanocrystalline structure after 15 hours;

[0017] (3) Mg with particle size 1.95 Al 0.05 Ni 0.92 V 0.08 Alloy powder and nanocrystalline Ni powder and Mg 1.95 Al 0.05 Ni 0....

Embodiment 2

[0020] (1) with embodiment 1;

[0021] (2) Press Mg 1.95 Al 0.05 Ni 0.92 V 0.08 3% of alloy powder weight takes by weighing fine Ni powder and carries out ball milling, and all the other are with embodiment 1;

[0022] (3) Mg with particle size 1.95 Al 0.05 Ni 0.92 V 0.08 Alloy powder and nanocrystalline Ni powder and Mg 1.95 Al 0.05 Ni 0.92 V 0.08 2-3% TiO by powder weight 2 After fully mixing with 0.1% carbon nanotubes, carry out high-energy ball milling, and the rest are the same as in Example 1.

[0023] The finished product obtained has the following performance indicators after testing: hydrogen storage capacity 3-5.5% (weight percent), hydrogen absorption / decomposition temperature 500, electrochemical capacity 450mA·h·g -1 .

Embodiment 3

[0025] (1) with embodiment 1;

[0026] (2) Press Mg 1.95 Al 0.05 Ni 0.92 V 0.08 5% of alloy powder weight takes by weighing fine Ni powder and carries out ball milling, and all the other are with embodiment 1;

[0027] (3) Mg with particle size 1.95 Al 0.05 Ni 0.92 V 0.08 Alloy powder and nanocrystalline Ni powder and Mg 1.95 Al 0.05 Ni 0.92 V 0.08 3% TiO by powder weight 2After fully mixing with 1% carbon nanotubes, carry out high-energy ball milling, and the rest are the same as in Example 1.

[0028] The finished product obtained has the following performance indicators after testing: hydrogen storage capacity 3-5.5% (weight percent), hydrogen absorption / decomposition temperature 500, electrochemical capacity 450mA·h·g -1 .

[0029] Example

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Abstract

The present invention discloses a kind of quaternary magnesium base hydrogen storing alloy and its production process and application. The quaternary magnesium base hydrogen storing alloy consists of Mg 1.5-2 weight portions, Al 0.02-0.08 weight portion, Ni 0.5-1.0 weight portion and A 0.05-0.1 weight portion, where A is V, Ti, Fe, Nd or Produce; and has dispersed nanometer crystalline clusters and nanometer amorphous clusters in the microstructure. It is produced through mixing alloy element powder, pressing to form sheet, sintering in a vacuum sintering furnace, crushing, ball milling, sieving to obtain alloy powder of granularity smaller than 25 micron; ball milling small amount of Ni powder to obtain nanometer crystalline Ni powder; mixing the alloy powder, the nanometer crystalline Ni powder and active second phase particle through high energy ball milling to obtain active hydrogen storing alloy material. The active hydrogen storing alloy material has low hydrogen adsorbing and desorbing temperature and other features.

Description

technical field [0001] The invention belongs to the field of materials, and specifically relates to a magnesium-based hydrogen storage alloy, as well as its preparation method and application. Background technique [0002] There are many hydrogen storage alloy systems, such as La-Ni system, Ti-Fe system, Zr system, rare earth system, etc., but they generally have disadvantages such as low hydrogen storage capacity, high hydrogen absorption / decomposition temperature, and high price, which seriously limit their use. use. Magnesium-based hydrogen storage alloys should arouse people's extensive attention. Binary or ternary magnesium-based hydrogen storage alloys (such as Mg-Ni, Mg-Mn-Ni) formed by adding alloying elements. These alloys have greatly improved hydrogen storage performance and electrochemical performance. The hydrogen storage capacity can be above 5%, but the dynamic / thermodynamic performance and corrosion resistance are poor. Accordingly, people have further add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00B22F3/16B22F9/04
Inventor 唐兴伦徐浩王琳
Owner 贵州佑邦科技有限公司
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