Nano crystal multiphase mixed rare earth-magnesium system hydrogen-storing alloy and its preparation method

A multi-phase mixing and hydrogen storage alloy technology, applied in the field of hydrogen storage materials, can solve the problems of difficulty in being extended to practical applications, low dehydrogenation pressure platform, difficult mass production, etc., and achieves good cycle stability, low cost, easy to use. activation effect

Inactive Publication Date: 2003-09-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) rare earth magnesium hydrogen storage alloy (such as Mg 75 Ni 20 Mmm 5 ) The dehydrogenation pressure platform is too low, it is not easy to activate, and the dehydrogenation temperature is above 200 ° C, it is difficult to promote to practical application;
[0005] (2) rare earth magnesium hydrogen storage alloy (such as Mm 1-y m y (NiCoN) x ) contains expensive metal elements such as Mo, Co, Pt, Hf, Ta, Ge, etc., and the cost is high;
[0006] (3) Rare earth magnesium hydrogen storage alloy Mm 1-y m y (NiCoN) x Contains V, Zr, Pd, Cd, In and other metal elements that will cause serious environmental pollution, causing pollution to the environment;
[0007] (4) Rare earth magnesium hydrogen storage alloy A 1-y B y C x Does not contain Ni element, so its hydrogen storage performance is very poor;
[0008] (5) The existing production process adopts vacuum magnetic levitation furnace or electric arc furnace melting preparation, which is difficult to operate and difficult to carry out mass production

Method used

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  • Nano crystal multiphase mixed rare earth-magnesium system hydrogen-storing alloy and its preparation method
  • Nano crystal multiphase mixed rare earth-magnesium system hydrogen-storing alloy and its preparation method
  • Nano crystal multiphase mixed rare earth-magnesium system hydrogen-storing alloy and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0030] Prepare Ml 0.98 Mg 0.02 Ni 4 Hydrogen storage alloy powder 10kg. The weight percent composition of mixed rare earth Ml is selected as La40%, Nd41%, Ce5%, Pr13%, and the rest are other rare earth elements and impurities. Magnesium is a bulk metal with a purity of 99%, and nickel is an electrolytic nickel with a purity of 99.99%. Brush off the oxide layer on the surface of the metal raw material, wash it, dry it, weigh it according to the stoichiometric ratio, weigh 3.7 kg of mixed rare earth, 0.2 kg of metal magnesium, and 6.2 kg of metal nickel, place it in the graphite crucible of the vacuum induction furnace, and cover it. Furnace cover, evacuated to a vacuum degree of 10 -3 Pa, fill in Ar gas until the pressure reaches 0.002Mpa, adjust the power range to 35kw, control the temperature at 1200°C to melt the metal, keep warm and stir fully, and the melting time is 1 hour. During the smelting process, pay close attention to the change of the air pressure in the furn...

Embodiment 2

[0037] Prepare Ml 0.7 Mg 0.3 Ni 3.2 Hydrogen storage alloy powder 10kg. The weight percent composition of mixed rare earth Ml is selected as La55%, Na31%, Ce5%, Pr8%, and the rest are other rare earth elements and impurities. Magnesium is a bulk metal with a purity of 99%, and nickel is an electrolytic nickel with a purity of 99.99%. Brush off the oxide layer on the surface of the metal raw material, wash it, dry it, weigh it according to the stoichiometric ratio, weigh 3.36 kg of mixed rare earth, 2.8 kg of metal magnesium, and 6.2 kg of metal nickel, place it in the corundum crucible of the vacuum induction furnace, and cover it. Furnace cover, evacuated to a vacuum degree of 10 -2 Pa, fill it with helium until the pressure reaches 0.1Mpa, adjust the power range to 10kw for 30 minutes, 20kw for 5 minutes, and control the temperature at 1000°C to melt the metal, keep it warm and stir it fully. During the smelting process, pay close attention to the change of the air pres...

Embodiment 3

[0044] Prepare Ml 0.2 Mg 0.8 Ni 2 Hydrogen storage alloy powder 10kg. The weight percentage composition of mixed rare earth Ml is selected as La81%, Nd8.5%, Ce4%, Pr5%, and the rest are other rare earth elements and impurities. Magnesium is a bulk metal with a purity of 99%, and nickel is an electrolytic nickel with a purity of 99.99%. Brush the metal raw materials to remove the surface oxide layer, wash and dry, weigh according to the stoichiometric ratio, weigh 1.7 kg of mixed rare earth, 1.2 kg of metal magnesium, and 7.1 kg of metal nickel, place them in the graphite crucible of the vacuum induction furnace, and cover them Furnace cover, evacuated to a vacuum degree greater than 10 -3 Pa, fill in nitrogen until the pressure reaches 0.02Mpa, adjust the power range to 15kw, control the temperature at 900°C to melt the metal, keep warm and fully stir, and the melting time is 1.5 hours. During the smelting process, pay close attention to the change of the air pressure in ...

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Abstract

The present invention relates to a nano crystal multi-phase mixed rear earth-magnesium system hydrogen-storing alloy and its preparation method. The preparation method of said alloy includes the following steps: smelting, homogenizing annealing, etc. and its smelting process is placing the La-enriched mixed rare earth, metal magnesium and metal nickel into an induction smelting furnace crucible according to a certain proportion, evacuating, charging protective gas, regulating power and temp. to melt metal, heat-insulating and fully stirring, injecting the molten metal into water-cooling ingotmould, cooling and discharging. Said alloy has anique components and multi-phase nano crystal structuer, and has good circulation stability.

Description

(1) Technical field [0001] The invention relates to the technical field of hydrogen storage materials, in particular to a nanocrystalline multiphase mixed rare earth-magnesium hydrogen storage alloy and a preparation method thereof. (2) Background technology [0002] Due to the implementation of the hydrogen energy plan to seek clean energy, the research on the metal-hydrogen system has developed rapidly in recent years, and many different types of hydrogen storage alloys have been developed, but so far, no alloys that can meet the hydrogen energy plan have been prepared. Hydrogen storage alloy materials. Tony Spassov et al. (J.Alloys and Compounds334 (2002) 219-223) produced Mg-Ni-RE9 (RE=Y or Mm) alloy by rapid quenching method, which has a two-phase structure, in which Mg 75 Ni 20 Mmm 5 The nanocrystalline / amorphous alloy has the best hydrogen storage performance, and the hydrogen storage capacity is 4.0% (weight percent). However, this method does not solve the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03H01M4/38H01M10/30
CPCY02E60/10
Inventor 彭成红朱敏
Owner SOUTH CHINA UNIV OF TECH
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