Preparation method of high capacity rare earth magnesium base hydrogen storage alloy

A technology for hydrogen storage alloys and rare earth magnesium, which is applied in the field of preparation of rare earth magnesium-based hydrogen storage alloys, which can solve the problems that it is difficult to prepare hydrogen storage alloys with stable components, the alloy composition cannot be guaranteed to be uniform and stable, and the volatilization of magnesium cannot be predicted and controlled, etc. problems, to achieve the effect of eliminating production safety problems, low cost, and good fluidity

Inactive Publication Date: 2006-06-14
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] in AB 3 In the production of rare-earth magnesium-based hydrogen storage alloys, because the melting point of metal magnesium is too different from that of nickel and cobalt, the melting temperature of the alloy is much higher than the boiling point of magnesium, so the conventional process of melting hydrogen storage alloys in a vacuum intermediate frequency induction furnace: pumping Vacuum, filled with argon or nitrogen to less than 0.1MPa negative pressure melting, it is difficult to produce a hydr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the general formula La 0.70 Mg 0.30 Ni 2.55 co 0.18 mn 0.08 al 0.19 The atomic ratio of each metal weighs 5 kg of metal raw material, and the molar ratio of MgCl 2 : CaCl 2 :CaF 2 =4:2:1 Add 0.5kg of covering agent, vacuumize to vacuum degree 5×10 -2 Pa, pass argon gas to 0.03MPa, melt in a vacuum intermediate frequency induction furnace, keep warm for 10 minutes, pour the alloy evenly into a water-cooled mold, and obtain an alloy ingot after cooling. The obtained alloy ingot was heat-treated at 1000° C. for 4 hours, then gas-quenched and cooled to room temperature, and mechanically crushed to a size smaller than 200 mesh.

Embodiment 2

[0019] According to the general formula La 2 Each metal atomic ratio of MgNi9 weighs 5 kg of metal raw material, and the molar ratio of MgCl 2 : CaCl 2 :CaF 2 =3:2:1 Add 0.3kg of covering agent, vacuumize to vacuum degree 5×10 -2 Pa, pass argon or nitrogen gas to 0.07MPa, melt in a vacuum intermediate frequency induction furnace, keep it warm for 10 minutes, and cool it with a water-cooled copper roller to obtain a 0.5mm thick alloy sheet. Insulated and heat-treated at 1050°C for 2 hours, then cooled to room temperature by air quenching, and mechanically crushed to less than 150 mesh.

Embodiment 3

[0021] According to the general formula La 0.7 Mg 0.3 Ni 2.65 co 0.75 mn 0.10 The atomic ratio of each metal weighs 5 kg of metal raw material, and the molar ratio of MgCl 2 : BaCl 2 :CaF 2 =2:2:1 Add 0.1kg of covering agent, vacuumize to vacuum degree 5×10 -2 Pa, pass argon gas to 0.07MPa, melt in a vacuum intermediate frequency induction furnace, keep warm for 7 minutes, and cool down with a water-cooled copper roller to obtain a 0.5mm thick alloy sheet. Heat preservation and heat treatment at 950°C for 4 hours, then air quench to cool to room temperature, and mechanically pulverize to less than 200 mesh.

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Abstract

The invention relates to high volume rare earth magnesium group hydrogen storage alloy manufacturing method. It features are adding raw material and its 0.1-20% protective cover into intermediate frequency furnace; pumping vacuum degree to less than 10-1pa; inputting argon or nitrogen to 0.03-0.1MPa; melting; keeping for 3-30 minutes after full melting; cooling alloy solution to gain alloy pig or alloy piece with thickness 0.05-1mm; doing heat preservation heat treatment for 2-24h at 700-1150 centigrade degree; cooling to room temperature; crushing to 100-300 order rare earth magnesium group hydrogen storage alloy. The AB3 type rare earth magnesium group hydrogen storage alloy has high volume, good cycle performance, and good sucking-discharging hydrogen performance. The cost is low. The technique is simple; process is easy to control; and it is adapted to large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of a rare-earth magnesium-based hydrogen storage alloy for a new nickel-metal hydride battery negative electrode material. Background technique [0002] In recent years, with the continuous development of nickel-metal hydride batteries in the direction of high capacity and high power, higher requirements have been put forward for hydrogen storage alloys, the key anode materials of nickel-hydrogen batteries, which need to have high capacity, good cycle performance and high-current discharge performance. High-performance anode materials with the characteristics of low cost and low cost. The current commercialized rare earth-based AB 5 The specific capacity of the type hydrogen storage alloy is about 300-340mAh / g, and there is not much room for improvement, so it cannot better meet the development requirements of high-capacity and high-power nickel-metal hydride batteries. [0003] AB 2 Alloys with high dis...

Claims

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Application Information

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IPC IPC(8): C22C23/00B22F9/04C22C1/04
Inventor 肖方明唐仁衡卢其云王英彭能
Owner GUANGDONG INST OF RARE METALS
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