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Method for preparing AB5-AB3 composite alloy

A technology of AB5-AB3 and composite alloy, which is applied in the direction of alkaline battery electrodes, battery electrodes, electrical components, etc., to achieve the effects of excellent dynamic performance, good cycle stability, and high discharge capacity

Inactive Publication Date: 2011-11-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adopt high capacity AB 3 Type Alloy Pair AB 5 Hydrogen Storage Alloy MlNi 3.5 co 0.6 mn 0.4 al 0.5 There is no report on the research of compound modification

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] (1) Prepare AB by vacuum induction melting metal raw materials respectively 5 Type MlNi 3.5 co 0.6 mn 0.4 Al 0.5 (Ml is mixed rare earth, the weight percentage of composition is: 37.7% La, 38.9% Ce, 6.3% Pr and 17.1% Nd) parent alloy and AB as modifier 3 Type Alloy Mm 0.89 Mg 0.11 Ni 2.97 mn 0.14 Al 0.20 co 0.54 (Mm is La-rich mixed rare earth, the weight percentage of composition is: 73.4%La, 5.8%Ce, 1.2%Pr and 19.5%Nd), above-mentioned two kinds of alloy ingots are mechanically pulverized respectively, and ball milling with speed 225 rev / min for 30 minutes , sieve 300 mesh particle powder;

[0010] (2) two kinds of alloys that step (1) is made according to weight percent: MlNi 3.5 co 0.6 mn 0.4 Al 0.5 95% and Mm 0.89 Mg 0.11 Ni 2.97 mn 0.14 Al 0.20 co 0.54 After mixing at a composition ratio of 5%, mechanical ball milling is performed to obtain a composite alloy, the ball-to-material ratio is 20:1, the rotating speed is 300 rpm, and the ball millin...

Embodiment 2

[0013] Except in step (2), the composition ratio of composite alloy is changed into weight percent: MlNi 3.5 co 0.6 mn 0.4 Al 0.5 90% and Mm 0.89 Mg 0.11 Ni 2.97 mn 0.14 Al 0.20 co 0.54 Be 10%, all the other are with embodiment 1.

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Abstract

The invention discloses a method for preparing an AB5-AB3 composite alloy. The method comprises the following steps of: respectively preparing an AB5 type M1Ni3.5Co0.6Mn0.4Al0.5 master alloy and an AB3 type alloy Mm0.89Mg0.11Ni2.97Mn0.14Al0.20Co0.54 as a modifier by a vacuum induction smelting method, respectively mechanically crushing two alloy ingots, ball milling the crushed alloy ingots at 225-250 rpm for 30-60min, and screening 200-300 meshes of particle powder for preparing the composite alloy; and mixing the prepared two alloy ingots in percentage by weight: 90-99.9% of M1Ni3.5Co0.6Mn0.4Al0.5 and 0.1-10% of Mm0.89Mg0.11Ni2.97Mn0.14Al0.20Co0.54, and ball milling to obtain the composite alloy, wherein the weight ratio of ball to powder is 20:1, the rotating speed is 200-300rpm and the time of ball milling is 30-60min. According to the method for preparing the AB5-AB3 composite alloy, an AB5 type hydrogen-storing alloy as an Ni / MH battery negative electrode material is compositely modified, thus an alloy electrode with higher discharge capacity, better cyclical stability and excellent dynamic performance can be obtained.

Description

technical field [0001] The invention relates to the fields of metallurgical chemistry and electrochemical research, especially AB 3 Type Alloy Pair AB 5 Type MlNi 3.5 co 0.6 mn 0.4 Al 0.5 A method for composite modification of a hydrogen storage alloy. Background technique [0002] Commercialized AB 5 As the negative electrode material of Ni / MH secondary battery, the type mixed rare earth alloy has high charge and discharge efficiency, low pressure of hydrogenation / dehydrogenation reaction and easy activation, but the technical difficulty of this kind of alloy electrode is mainly that the hydrogen storage capacity is too low , thus greatly hindering the further development and application of the alloy, how to improve the AB 5 The discharge capacity of type alloys is the top priority of the research work. Because the recombination effect can provide a large number of particle interfaces and grain interfaces and second phases of different compositions for the hydrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04H01M4/26H01M4/38
CPCY02E60/124Y02E60/10
Inventor 黄红霞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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