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High-coercivity rare-earth-free MnAlM permanent magnet alloy and preparation method thereof

A technology of permanent magnet alloy and high coercive force, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., and can solve problems such as low coercive force, high saturation magnetization and high coercive force that are difficult to obtain at the same time problem, to achieve the effect of increasing the coercive force of the alloy, facilitating production and promotion, and reducing intergranular exchange coupling

Pending Publication Date: 2022-03-08
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this coercive force is obtained at a lower temperature. The coercive force of the MnAl-based permanent magnet alloy obtained at room temperature is relatively low, and it is difficult to obtain high saturation magnetization and high coercive force at the same time. In the MnAl system, there are few studies on the generation of a second opposite ferromagnetic phase, or even through ferromagnetic / antiferromagnetic exchange biasing to increase the coercive force.

Method used

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  • High-coercivity rare-earth-free MnAlM permanent magnet alloy and preparation method thereof
  • High-coercivity rare-earth-free MnAlM permanent magnet alloy and preparation method thereof
  • High-coercivity rare-earth-free MnAlM permanent magnet alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Ingredients

[0047] The pure manganese block, pure aluminum block and pure tungsten powder with a purity of not less than 99.9% are used according to the nominal molecular formula Mn 50 al 49 W 1 Raw materials are prepared to obtain master alloy raw materials. In addition, based on the mass of Mn in the master alloy raw materials, an additional 3% pure manganese block is added to the master alloy raw materials.

[0048] (2) Preparation of MnAlM alloy ingot

[0049] Using a non-consumable vacuum electric arc furnace, put the master alloy raw material into a water-cooled copper crucible, and fill it with an inert gas (argon) as a protective gas after vacuuming, repeat the above pumping and filling process 3 times, and put it under an inert gas atmosphere. The alloy is repeatedly smelted 3 times, and the surface is turned over every time it is smelted. The vacuum degree of the vacuum electric arc furnace is higher than 1*10 -3 Pa, the current intensity of the vacu...

Embodiment 2

[0056] The difference between embodiment 2 and embodiment 1 is: the nominal molecular formula Mn of high coercive force rare earth-free MnAlM permanent magnet alloy 50 al 48 W 2 , the current intensity of the vacuum electric arc furnace is 55A, smelting 4 times, the heat treatment temperature is 1200 ℃, the heat treatment time is 18h, and the rest is exactly the same as in Example 1.

[0057] mn 50 al 48 W 2 The XRD pattern of the alloy ingot is as follows figure 1 Shown in curve (b).

[0058] mn 50 al 48 W 2 The magnetic performance data of permanent magnet alloy ingots under different temperature conditions are shown in Table 1.

[0059] High coercive force Rare earth free Mn 50 al 48 W 2 The XRD pattern of the permanent magnet alloy ingot is as follows figure 2 Shown in curve (b).

[0060] High coercive force Rare earth free Mn 50 al 48 W 2 The hysteresis loops of permanent magnet alloy ingots measured under different temperature conditions are as follows:...

Embodiment 3

[0067] Compared with embodiment 1, embodiment 3 is different in that: the pure manganese block, pure aluminum block and pure zinc block with a purity of not less than 99.9% are used according to the nominal molecular formula Mn of the high coercive force rare earth-free MnAlM permanent magnet alloy 50 al 49 Zn 1 Raw materials were configured to obtain master alloy raw materials, and the rest were identical to Example 1.

[0068] mn 50 al 49 Zn 1 The XRD pattern of the alloy ingot is as follows Figure 7 Shown in curve (a).

[0069] High coercive force Rare earth free Mn 50 al 49 Zn1 The magnetic performance data of permanent magnet alloy ingots under different temperature conditions are shown in Table 2.

[0070] High coercive force Rare earth free Mn 50 al 49 Zn 1 The XRD pattern of the permanent magnet alloy ingot is as follows Figure 8 Shown in curve (a).

[0071] High coercive force Rare earth free Mn 50 al 49 Zn 1 The hysteresis loops of permanent magnet ...

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Abstract

The invention discloses and provides a high-coercivity rare earth-free MnAlM permanent magnet alloy, the nominal molecular formula of the high-coercivity rare earth-free MnAlM permanent magnet alloy is Mn < 50 + x > Al < 50-x-y > M < y >, x is equal to 0-3, y is equal to 1-3, and M is Zn or W. The high-coercivity rare earth-free MnAlM permanent magnet alloy not only has excellent machining performance and good corrosion resistance, but also is low in price and simple in preparation process, and does not need to be treated by a complex magnetic field. The invention further provides a preparation method of the high-coercivity rare-earth-free MnAlM permanent magnet alloy, the coercivity temperature coefficient is converted into a positive value from a negative value by regulating and controlling doping elements and a heat treatment process, the process is simple and convenient, the production cost is low, and actual production and popularization are facilitated.

Description

technical field [0001] The invention relates to a permanent magnet alloy, in particular to a rare earth-free MnAlM permanent magnet alloy with high coercivity and a preparation method thereof. Background technique [0002] Permanent magnet materials play an important role in modern industrial production and people's life. Magnetic materials are widely used, for example, they can be used in electroacoustics, magnetic memory, telecommunications, permanent magnet motors, memory components, microwave components, magnetic resonance equipment, etc. The magnetic properties of MnAl materials are higher than traditional hard ferrite and AlNiCo alloys, but inferior to rare earth permanent magnets. However, rare earth resources are strategic resources, which are not only expensive but also cause serious environmental pollution during production, which limits the development of rare earth materials. Rare-earth-free permanent magnet materials represented by MnAl are rich in resources, ...

Claims

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Application Information

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IPC IPC(8): H01F1/047H01F41/02C22C22/00C22C1/03B22D11/06C22F1/16C21D1/18
CPCH01F1/047H01F41/0253H01F41/0286C22C22/00C22C1/03B22D11/0611C22F1/16C22F1/002C22C2202/02
Inventor 苏昆朋商启香霍德璇王海欧黄帅
Owner HANGZHOU DIANZI UNIV
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