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A permanent magnet alloy and a preparation method thereof

A permanent magnet alloy and alloy technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve problems such as the decrease of saturation magnetization, achieve high saturation magnetization, increase coercive force, and enhance the effect of coercive force

Active Publication Date: 2018-12-25
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned approaches have encountered a big bottleneck. Although the coercive force of the obtained MnAl alloy can reach 3kOe-5kOe, it is accompanied by a large amount of decomposition of the ferromagnetic τ phase, resulting in a sharp drop in saturation magnetization.

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  • A permanent magnet alloy and a preparation method thereof
  • A permanent magnet alloy and a preparation method thereof
  • A permanent magnet alloy and a preparation method thereof

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Embodiment 1

[0066] This embodiment provides a method for preparing a permanent magnetic alloy, and the specific steps adopted are as follows:

[0067] 1. According to the nominal molecular formula (Mn 0.54 al 0.46 ) 99.8 Tb 0.2 , use high-purity metal elemental Mn, Al, Tb for proportioning, and add 5wt.% of Mn to compensate for volatilization, that is, Mn: Al: Tb is (0.54×99.8×1.05): (0.46×99.8): 0.2( The molar ratio of).

[0068] The above-mentioned raw materials are smelted in an electric arc melting furnace, and the vacuum degree of the vacuum chamber is adjusted to 4×10 during smelting. - 3 Pa, filled with argon gas and scrubbed three times, then filled with a small amount of argon gas again, and smelted under the protection of argon gas, until the electric current of arc smelting was maintained in the range of 100A-200A, and the sample was repeatedly smelted 4 times (two for each front and back) times), after the smelting is completed, it is taken out after cooling with the fur...

Embodiment 2

[0083] This embodiment provides a method for preparing a permanent magnetic alloy, and the specific steps adopted are as follows:

[0084] 1. According to the nominal molecular formula (Mn 0.54 Al 0.46 ) 99.9 sc 0.1 , use high-purity metal elemental Mn, Al, Sc for proportioning, and add an additional 5wt.% of Mn to compensate for volatilization, that is, Mn:Al:Sc (molar ratio) is (0.54×99.9×1.05): (0.46×99.9 ): 0.1.

[0085] The above-mentioned raw materials are smelted in an electric arc melting furnace, and the vacuum degree of the vacuum chamber is adjusted to 5×10 during smelting. - 3 Pa, filled with argon gas and scrubbed three times, then filled with a small amount of argon gas, smelting under the protection of argon gas, the current until the arc melting is maintained in the range of 100A-200A, and the sample is repeatedly smelted 4 times (two times for the front and back sides) ), after the smelting is completed, it is taken out after cooling with the furnace for...

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Abstract

The invention provides a permanent magnet alloy and a preparation method thereof, relating to the technical field of permanent magnet materials. The nominal molecular formula of the permanent magnet alloy is (Mn0.5 + xAl0.5-X) 100-yREy, where 0.01 <= x <= 0. 09, 0.1 <= y <= 1. 0, RE is one or more of rare earth elements. The invention also provides a preparation method of the permanent magnet alloy, The coercivity of MnAl alloys was improved by adding rare earth elements into the matrix, rapid melt quenching and surfactant-assisted ball milling. A large amount of dispersed nano-precipitates were introduced into the [tau]-phase matrix as pinning centers to impede the magnetic domain motion. At the same time, compared with MnAl permanent magnet alloy, the permanent magnet alloy does not sacrifice saturation magnetization, and [tau] phase has strong stability and high Curie temperature. Moreover, the preparation method has the advantages of simple process, good repeatability and stability.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, and in particular relates to a permanent magnet alloy and a preparation method thereof, in particular to a technique for obtaining a high-performance permanent magnet alloy by doping a trace amount of rare earth elements in a MnAl permanent magnet alloy. Background technique [0002] Permanent magnet materials play an indispensable role in various applications such as permanent magnet motors. With the continuous development of modern technology, the research and development and application of high-performance permanent magnet materials are also receiving more and more close attention. At present, the most widely used permanent magnet materials mainly include rare earth permanent magnets represented by Nd-Fe-B and ferrite permanent magnets. However, in recent years, due to the increasing scarcity of rare earth resources and the substantial increase in price, coupled with the lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055C22C22/00C22C1/03C22F1/16
CPCC22C1/03C22C22/00C22F1/16H01F1/0551
Inventor 蒋成保赵爽吴煜烨王敬民张天丽刘敬华
Owner BEIHANG UNIV