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Preparation method of non-rare earth MnAl permanent magnetic alloy

A permanent magnet alloy, rare earth-free technology, used in magnetic materials, magnetic objects, electrical components, etc., can solve the problems of low coercivity of MnAl permanent magnet alloys, difficulty in obtaining τ-MnAl phase, and limited application scope of alloys, etc. Achieve the effects of excellent machinability and corrosion resistance, simple production process and low cost

Inactive Publication Date: 2015-05-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The τ-MnAl phase is a metastable phase, and its composition ranges from 50 to 59 at.% of the Mn content. It is usually obtained from the high-temperature ε-MnAl phase (hcp structure) by cooling or isothermal annealing. The ε-MnAl phase It is a high-temperature phase, and it is difficult to directly obtain the τ-MnAl phase by the traditional preparation process, so it is difficult to obtain the τ-MnAl phase; therefore, the τ-phase MnAl alloys prepared by different methods contain more or less non-magnetic MnAl phases such as beta phase and gamma 2 phase, the transformation of the τ phase cannot be fully realized, which affects its magnetic properties; secondly, the coercive force of the obtained MnAl permanent magnet alloy is low, which seriously limits the application range of the alloy

Method used

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  • Preparation method of non-rare earth MnAl permanent magnetic alloy
  • Preparation method of non-rare earth MnAl permanent magnetic alloy
  • Preparation method of non-rare earth MnAl permanent magnetic alloy

Examples

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Embodiment 1

[0027] The pure manganese block and pure aluminum block with a purity of not less than 99.9% are formulated with an appropriate atomic percentage into Mn 55 Al 45 In the master alloy sample, since Mn is very volatile during smelting, in order to compensate for its volatilization during smelting, an additional 7 atomic percent of Mn was added to the batching, totaling 15 grams. Using a non-consumable vacuum electric arc furnace, under the protection of argon, put the master alloy raw materials with a good ratio into a water-cooled copper crucible, and then fill it with 99.99% argon as a protective atmosphere after vacuuming, and repeatedly smelt the alloy 4 times to obtain The as-cast master alloy with uniform composition; the smelted MnAl alloy ingot is broken, and the broken block alloy is put into acetone solution and alcohol solution for ultrasonic cleaning, and then it is taken out and dried naturally; MnAl is prepared by single-roller quick quenching method Alloy thin st...

Embodiment 2

[0030] The pure manganese block and pure aluminum block with a purity of not less than 99.9% are formulated with an appropriate atomic percentage into Mn 52 Al 48For the master alloy sample, since Mn is very volatile during smelting, in order to compensate for its volatilization during smelting, an additional 5 atomic percent of Mn was added during the batching, totaling 15 grams. Using a non-consumable vacuum electric arc furnace, put the proportioned master alloy raw materials into a water-cooled copper crucible under the protection of argon, and repeatedly smelt the alloy 4 times to obtain a cast master alloy with uniform composition; The alloy ingot is broken, and the broken block alloy is put into acetone solution and alcohol solution for ultrasonic cleaning, taken out and dried naturally; the MnAl alloy thin strip is prepared by single-roll quick quenching method, and the cleaned block alloy is put into In the quartz tube of the quenching tape-making equipment, the cham...

Embodiment 3

[0033] The pure manganese block and pure aluminum block with a purity of not less than 99.9% are formulated with an appropriate atomic percentage into Mn 58 Al 42 For the master alloy sample, since Mn is very volatile during smelting, in order to compensate for its volatilization during smelting, an additional 9 atomic percent of Mn was added to the ingredients, totaling 15 grams. Using a non-consumable vacuum electric arc furnace, put the proportioned master alloy raw materials into a water-cooled copper crucible under the protection of argon, and repeatedly smelt the alloy 4 times to obtain a cast master alloy with uniform composition; The alloy ingot is broken, and the broken block alloy is put into acetone solution and alcohol solution for ultrasonic cleaning, taken out and dried naturally; the MnAl alloy thin strip is prepared by single-roll quick quenching method, and the cleaned block alloy is put into In the quartz tube of the quenching tape-making equipment, the cham...

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Abstract

The invention relates to a preparation method of a non-rare earth MnAl permanent magnetic alloy. The preparation method comprises the following steps: (1) preparing the compositions of a master alloy sample: preparing master alloy raw materials with Mn60-xAl40+x as a nominal composition according to the atom percentage, wherein x is equal to 0-10; (2) smelting the master alloy: adopting a non-self-consumable electric arc furnace, putting the prepared master alloy raw materials into a water cooling copper crucible, and repeatedly smelting the alloy for 3-5 times to obtain a MnAl alloy ingot with uniform compositions; (3) preparing an MnAl alloy ribbon by the MnAl alloy ingot by adopting a single-roller rapid quenching method; (4) carrying out vacuum heat treatment: carrying out vacuum heat treatment on the MnAl alloy ribbon obtained in the third step to obtain a tau-phase MnAl alloy; and (5) mechanical ball milling: ball milling the tau-phase MnAl alloy obtained in the fourth step to obtain tau-phase MnAl alloy powder, namely the non-rare earth MnAl permanent magnetic alloy with high coercivity. Compared with the prior art, according to the preparation method disclosed by the invention, the cost is low, the preparation process is simple, and the obtained MnAl permanent magnetic alloy is good in permanent magnetic property and high in coercivity.

Description

technical field [0001] The invention relates to a preparation method of a rare earth-free MnAl permanent magnet alloy, belonging to the technical field of permanent magnet alloy preparation. Background technique [0002] Permanent magnet materials are widely used in magnetic levitation, medical equipment, electric vehicles, and motor systems for wind power generation. With the development of new energy and electric vehicles, the demand for high-performance permanent magnet materials is increasing. In the past ten years, the annual output growth of rare earth permanent magnet materials has exceeded 10%. However, rare earth resources are limited and expensive, and the production process causes serious environmental pollution, which limits the future development of rare earth permanent magnet materials. Rare-earth-free permanent magnet materials represented by permanent ferrite have a broad application market due to abundant resources and low prices. However, the permanent ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C22/00B22F9/04H01F1/047
Inventor 陆伟凌敏黄平贾敏牛俊超夏卡达
Owner TONGJI UNIV
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