Method for preparing high-capacity long-life rare earth and magnesium-based hydrogen storage alloy

A hydrogen storage alloy, long-life technology, applied in the direction of electrical components, circuits, battery electrodes, etc., can solve the difficulty of stably realizing the pilot-scale industrial preparation of rare earth magnesium-based hydrogen storage alloys, poor safety of positive pressure smelting equipment, and poor composition uniformity And other problems, to achieve the effect of precise control, shorten residence time, and reduce volatilization

Active Publication Date: 2012-07-18
GRIMAT ENG INST CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The above method also has disadvantages such as a large amount of Mg volatilization, poor composition uniformity, pollution of the covering agent to the alloy, and poor safety of the positive pressure smelting equipment. It is difficult to stably realize the pilot test, especially the industrial production of rare earth magnesium-based hydrogen storage alloys.

Method used

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  • Method for preparing high-capacity long-life rare earth and magnesium-based hydrogen storage alloy
  • Method for preparing high-capacity long-life rare earth and magnesium-based hydrogen storage alloy
  • Method for preparing high-capacity long-life rare earth and magnesium-based hydrogen storage alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the designed composition La 0.63 Y 0.1 Nd 0.1 Mg 0.17 (Ni 0.90 Al 0.05 co 0.05 ) 3.6 , the preparation of La (purity > 99.5%, polished), Y (purity > 99.5%), Nd (purity > 99.5%, polished), nickel-magnesium master alloy (Mg content 30%, Ni+Mg total content > 99% ), Ni (purity > 99.5%, dried), Al (purity > 99.5%), Co (purity > 99.5%, dried) totaling 50kg, of which the Mg content is designed to exceed 5%. Put the raw metals into the crucible according to Al, Ni, Co, La, Nd, Y from bottom to top, and put the nickel-magnesium master alloy into the secondary feeding device. First evacuate to 5Pa, then bake and wash the furnace, fill it with argon to 0.05MPa, adjust the power to start melting, the temperature of the alloy melt is 1773K and keep it for 5 minutes, and then refine for 2 minutes. Reduce the melt temperature to 1573K through the "melt temperature online monitoring and control system", start the secondary feeding device to add nickel-magnesium ma...

Embodiment 2

[0035] Design composition is the same as embodiment 1

[0036] The ingredients are 500kg

[0037] The heat-treated alloy is pulverized by high-energy airflow crushing, rotary vibration screening, batching, and vacuum packaging to obtain rare earth magnesium-based hydrogen storage alloy powder products.

Embodiment 3

[0039] The design composition is La 0.7 Mg 0.3 (Ni 0.83 co 0.15 Al 0.02 ) 3.5

[0040] The ingredients are 50kg

[0041] Carry out heat treatment at 1123K for 10 hours

[0042] Then, it is pulverized by a mill and sieve machine and passed through a 150-mesh sieve to obtain rare earth magnesium-based hydrogen storage alloy powder.

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Abstract

The invention discloses a method for preparing a high-capacity long-life rare earth and magnesium-based hydrogen storage alloy, which comprises the following steps: (1) material pretreatment; (2) material preparation; (3) vacuum induction melting and two times of material feeding; (4) melt-spun quick quenching; (5) hot treatment; (6) air flow high-energy crushing; (7) rotation vibration screening; (8) blending; and (9) vacuum packaging. In the process, the melt-spun quick quenching has a higher setting rate which is 10<5> to 10<6>K / s and can retain a high temperature phase part which has excellent circulation stability and a structure of a Pr5Co19 type or Ce5Co19 type to ensure the high capacity and long life of the rare earth and magnesium-based hydrogen storage alloy through the synergy of the high temperature phase part and a phase has a structure of a Ce2Ni7 type or Gd2Co7 type, the two times of material feeding are used for evenly adding Mg, and the 'sectional control' of molten alloy temperature is used to reduce the volatilization of the Mg as much as possible for accurately controlling the content of Mg and ensuring the desirable fluidity of the molten alloy during pouring. The process for preparing the rare earth and magnesium-based hydrogen storage alloy of the invention has the advantages of controllable components, fine alloy crystalline grain and high product yield.

Description

technical field [0001] The invention relates to a preparation method of a high-capacity and long-life rare-earth magnesium-based hydrogen storage alloy for the negative electrode of a nickel-hydrogen battery. technical background [0002] Hydrogen storage alloys are metal hydrogen storage materials, because they can absorb and release hydrogen safely and reversibly in a large amount (the hydrogen storage density is higher than liquid hydrogen) under appropriate temperature and pressure, and the hydrogen absorption and desorption process is accompanied by certain thermal effects , so it has attracted attention as an energy conversion material and energy storage material related to clean energy-hydrogen energy. As a new type of functional material, the application fields of hydrogen storage alloys are as follows: (1) storage of hydrogen energy and thermal energy; (2) separation, recovery and purification of hydrogen; (3) separation of hydrogen isotopes; (4) civil or mixed Neg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02H01M4/38C22F1/06
CPCY02E60/12Y02E60/10
Inventor 周增林宋月清崔舜林晨光黄长庚钱文连杨金洪陈焕然张永健朱桂荣
Owner GRIMAT ENG INST CO LTD
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