Method for preparing anisotropy MnAlC single variant through uniaxial pressure constraint transformation

A uniaxial pressure, anisotropic technology, applied in the field of MnAlC-τ phase single variant, can solve the problem of low permanent magnet performance, achieve the effects of good permanent magnet performance, elimination of twins, and simple process

Inactive Publication Date: 2018-07-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the particularity of the martensitic phase transformation and crystal structure of the MnAl alloy, the τ phase prepared by the above method has a twin structure, so only isotropic polymorphs can be obtained, and the permanent magnetic properties are low.

Method used

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  • Method for preparing anisotropy MnAlC single variant through uniaxial pressure constraint transformation
  • Method for preparing anisotropy MnAlC single variant through uniaxial pressure constraint transformation
  • Method for preparing anisotropy MnAlC single variant through uniaxial pressure constraint transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The saturation magnetization is 117emu / g (Mn 54 al 46 ) 97 C 3 single variant

[0041] The first step: making MnAlC rods

[0042] Press (Mn 54 al 46 ) 97 C 3 Prepare the master alloy with the target composition; then put the master alloy in the vacuum electric arc furnace, and adjust the vacuum degree of the vacuum chamber to 4×10 -3 Pa, filled with argon to 0.7×10 5 Pa, cast after repeated smelting for 5 times (Mn 54 al 46 ) 97 C 3 bar;

[0043] The second step: making (Mn 54 al 46 ) 97 C 3 Alloy ε phase single crystal

[0044] The obtained (Mn 54 al 46 ) 97 C 3 The bar is cut into cylindrical material rods and seed crystal rods, and the cylindrical material rods and seed crystal rods are placed in the FZ-T-4000-H photon heating zone melting crystal growth furnace produced by Crystal Systems, and the photon heating zone melting is used prepared by method (Mn 54 al 46 ) 97 C 3 single crystal;

[0045] System (Mn 54 al 46 ) 97 C 3 Single c...

Embodiment 2

[0056] The saturation magnetization is 121emu / g (Mn 54 al 46 ) 99 C 1 Alloy tau phase single variant

[0057] The first step: making MnAlC rods

[0058] Press (Mn 54 al 46 ) 99 C 1 Prepare the master alloy with the target composition; then put the master alloy in the vacuum electric arc furnace, and adjust the vacuum degree of the vacuum chamber to 5×10 -3 Pa, filled with argon to 0.5×10 5 Pa, cast after repeated smelting for 5 times (Mn 54 al 46 ) 99 C 1 bar;

[0059] Second step: adopt the preparation method identical with embodiment 1 to make (Mn 54 al 46 ) 99 C 1 Alloy ε phase single crystal.

[0060] The third step: uniaxial pressure-confined phase transition preparation (Mn 54 al 46 ) 99 C 1 Alloy tau phase single variant

[0061] The obtained (Mn 54 al 46 ) 99 C 1 Single crystal cutting, to obtain a cuboid single crystal sample, so that the longer direction is direction; then the cuboid single crystal sample was placed in the environmental c...

Embodiment 3

[0065] The saturation magnetization is 104emu / g (Mn 54 al 46 ) 97 C 3 single variant

[0066] The first step: adopt the preparation method identical with embodiment 1 to make (Mn 54 al 46 ) 97 C 3 bar.

[0067] The second step: making (Mn 54 al 46 ) 97 C 3 single crystal;

[0068] The obtained (Mn 54 al 46 ) 99 C 1 The bar is cut into cylindrical material rods and seed crystal rods, and the cylindrical material rods and seed crystal rods are placed in the FZ-T-4000-H photon heating zone melting crystal growth furnace produced by Crystal Systems, and the photon heating zone melting is used prepared by method (Mn 54 al 46 ) 97 C 3 single crystal;

[0069] System (Mn 54 al 46 ) 97 C 3 Single crystal process parameters:

[0070] Adjust the vacuum degree of the vacuum chamber in the growth furnace to 2×10 -3 Pa;

[0071] Filled with high-purity argon to 1.2×10 5 Pa, the flow rate of argon gas is 2.0L / min, and high-purity argon is used as the flowing gas...

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Abstract

The invention provides a method for preparing an anisotropy MnAlC magnetic single variant through uniaxial pressure constraint transformation and the MnAlC single variant prepared by the method. The method comprises the steps of carrying out smelting, rod casting and single crystal growth on MnAlC raw materials to form a MnAlC-epsilon phase single crystal; and annealing the MnAlC-epsilon phase single crystal for 3-10 min under uniaxial pressure of 250-350MPa and temperature of 580-680 degrees centigrade, thereby preparing a MnAlC-tau phase single variant. The MnAlC-tau phase single variant prepared by the method has saturation magnetization intensity exceeding 100emu / g and complete anisotropy, and an equivalent magnetocrystalline anisotropy field is greater than 4T. The method and the MnAlC single variant have the advantages that (1), bicrystals in alloy can be effectively eliminated, the single variant organization is realized, the material has anisotropy, and the relatively good permanent magnet performance is obtained; (2), the technology is simple, and bad influences of produced microdefects and precipitated equilibrium phases on the magnetic performance can be completely avoided.

Description

technical field [0001] The invention relates to a treatment method for obtaining anisotropic MnAlC-τ phase single variant by performing uniaxial pressure annealing (580-680° C., 250-350 MPa) on MnAlC-ε phase single crystal. Background technique [0002] Permanent magnets are widely used in motors, generators, computers, electronic devices, communications, automobiles and aerospace industries, and have penetrated into every aspect of people's daily life. [0003] With the rise of rare earth prices and the gradual reduction of non-renewable rare earth resources, it is of great significance to study new non-rare earth permanent magnet materials that can replace the current largest amount of rare earth permanent magnet materials. However, the comprehensive properties of the existing non-rare earth permanent magnet materials cannot meet the requirements of high saturation magnetization, high anisotropy field, and high Curie temperature at the same time, thus limiting their applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F41/02
CPCH01F1/147H01F41/0253
Inventor 蒋成保张驰王敬民张天丽刘敬华
Owner BEIHANG UNIV
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