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Yttrium-nickel rare earth-based hydrogen storage alloy

A hydrogen storage alloy and rare earth technology, applied in electrical components, alkaline battery electrodes, battery electrodes, etc., can solve the problems of difficult control of alloy composition, potential safety hazards, and increased manufacturing difficulty, so as to improve electrical and thermal conductivity, eliminate Structural stress and compositional segregation, effect of simple fabrication method

Active Publication Date: 2015-04-22
BAOTOU RES INST OF RARE EARTHS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alloy composition of this patent must contain Mg element. Due to the high vapor pressure of the active metal element magnesium, the manufacturing difficulty is increased, and the alloy composition is difficult to control. At the same time, the volatilized fine magnesium powder is flammable and explosive, which poses a safety hazard.

Method used

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  • Yttrium-nickel rare earth-based hydrogen storage alloy
  • Yttrium-nickel rare earth-based hydrogen storage alloy
  • Yttrium-nickel rare earth-based hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 13

[0020] The alloys described in Example 13 and Example 14 were prepared using the same ratio of raw materials. The alloy described in Example 13 is prepared by the aforementioned high-temperature smelting-quick quenching method. The process is as follows: the purity of each elemental metal or intermediate alloy raw material in the composition is >99.0%, and the ratio of each raw material is calculated according to the chemical molecular formula and accurately weighed ( Raw materials that are easy to burn need to increase the ratio in an appropriate amount), put the raw materials into Al 2 o 3 The crucible is evacuated to 3.0Pa and filled with inert gas Ar to 0.055MPa. Heat up and smelt, keep warm for about 6 minutes and then quickly solidify. The speed of the quick-setting copper roller is 3.4m / s. The copper roller is usually fed with cooling water, and the temperature of the cooling water is 25°C.

Embodiment 14

[0021] The alloy described in Example 14 can also be prepared by high-temperature smelting-quick quenching method, and an annealing heat treatment step is added in the process, specifically: the purity of each elemental metal or intermediate alloy raw material in the composition is >99.0%, and the proportion is calculated according to the chemical molecular formula Calculate and accurately weigh each raw material (the proportion of easy-to-burn raw materials needs to be increased in an appropriate amount), and put the raw materials into Al 2 o 3 The crucible is evacuated to 3.0Pa and filled with inert gas Ar to 0.055MPa. Heat up and smelt, keep warm for about 6 minutes and then quickly solidify. The speed of the quick-setting copper roller is 3.4m / s. The copper roller is usually fed with cooling water, and the temperature of the cooling water is 25°C. The quick-setting alloy flakes were annealed and heat-treated at 750°C for 8 hours under the protection of vacuum or inert g...

Embodiment 20

[0022] Ml in Example 20 is a lanthanum-rich mixed rare earth metal, which contains about 64% of La, about 25% of Ce, about 3% of Pr, and about 8% of Nd.

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Abstract

The invention relates to A2B7 type RExYnNiz-a-bMnaAlb hydrogen storage alloy. The alloy is good in pressure-composition-isothermality, and has a maximum hydrogen storage amount of up to more than 1.36 wt.% under usual conditions. The alloy of the invention has better electrochemical performance as a hydrogen storage electrode and better gas-phase hydrogen absorption and desorption performance as a hydrogen storage material than traditional LaNi5 type hydrogen storage alloy; the alloy contains no magnesium element in the composition, so the preparation method of the alloy is simple and safe when compared with that of traditional rare earth-magnesium-nickel-based A2B7 type hydrogen storage alloy.

Description

technical field [0001] The present invention relates to a 2 B 7 type rare earth-yttrium-nickel hydrogen storage alloy. Background technique [0002] Hydrogen storage alloys are a class of functional materials with high hydrogen storage density discovered in the late 1960s. The existing hydrogen storage alloys can be roughly divided into six categories in terms of composition: rare earth series AB 5 type like LaNi 5 ; Magnesium series such as Mg 2 Ni, MgNi, La 2 Mg 17 ;Rare earth-magnesium-nickel system AB 3-4 type like La 2 MgNi 9 , La 5 Mg 2 Ni 23 , La 3 MgNi 14 ;Titanium-based AB type such as TiNi, TiFe; zirconium, titanium-based Laves phase AB 2 Type such as ZrNi 2 ; Vanadium series solid solution type such as (V 0.9 Ti 0.1 ) 1-x Fe x . [0003] The widely used hydrogen storage material is LaNi 5 type hydrogen storage alloy. The alloy is mainly used as the negative electrode material of metal hydride-nickel secondary battery (MH / Ni), and its theoreti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C19/03H01M4/38H01M4/24
CPCY02E60/10
Inventor 闫慧忠熊玮王利李宝犬李金
Owner BAOTOU RES INST OF RARE EARTHS
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