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MnAlC-based high coercive force permanent magnetic material and preparation method thereof

A high coercivity, permanent magnet material technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problem of not getting rid of the restriction of rare earth elements, and achieve the effect of refining magnetic particles and improving coercivity.

Active Publication Date: 2016-06-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the comprehensive magnetic properties of the multi-component system have been improved, it still does not get rid of the constraints of rare earth elements.
Lin Peihao et al. (MnAl alloy magnetic wave-absorbing material and its preparation method, CN103409669A, 2013.08.13) although the MnAl alloy was smelted under the protection of argon gas, this type of material belongs to the field of microwave materials, mainly by utilizing the wave-absorbing properties of magnetic materials. Don't pay attention to magnetic properties such as saturation magnetization and coercive force

Method used

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  • MnAlC-based high coercive force permanent magnetic material and preparation method thereof
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  • MnAlC-based high coercive force permanent magnetic material and preparation method thereof

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Embodiment 1

[0030] Particles of manganese, aluminum, carbon and transition metal cobalt with a purity of 99.95% are given the nominal formula Mn 53.3 Al 44 C 1.7 co 1.0 Make a ratio. During smelting, in order to make the alloy composition as uniform as possible, an induction melting furnace is selected, and in order to prevent the reaction between metal aluminum and the crucible, a boron nitride crucible is selected during induction smelting. The steps of pre-pumping, scrubbing and high-vacuumizing the induction melting furnace make the chamber pressure at 10 -4 -10 -5Pa, repeated smelting 3-4 times under this vacuum condition to obtain Mn with uniform composition 53.3 al 44 C 1.7 co 1.0 Master alloy ingot. The master alloy ingot obtained after smelting was ground with a grinding wheel to remove the surface scale, and then mechanically crushed to obtain a soybean-sized block alloy for rapid melt quenching in a quartz tube. Before the rapid quenching, the broken alloy is alternat...

Embodiment 2

[0032] Particles of manganese, aluminum, carbon and transition metal iron with a purity of 99.95% are given the nominal molecular formula Mn 53.3 al 44 C 1.7 Fe 1.0 Make a ratio. During smelting, in order to make the alloy composition as uniform as possible, an induction melting furnace is selected, and in order to prevent the reaction between metal aluminum and the crucible, a boron nitride crucible is selected during induction smelting. The steps of pre-pumping, scrubbing and high-vacuumizing the induction melting furnace make the chamber pressure at 10 -5 Pa, repeated smelting 3-4 times under this vacuum condition to obtain Mn with uniform composition 53.3 al 44 C 1.7 Fe 1.0 Master alloy ingot. The master alloy ingot obtained after smelting was ground with a grinding wheel to remove the surface scale, and then mechanically crushed to obtain a soybean-sized block alloy for rapid melt quenching in a quartz tube. Before the rapid quenching, the broken alloy is alterna...

Embodiment 3

[0034] Manganese, aluminum, carbon, and transition metal nickel particles with a purity of 99.95% were given the nominal formula Mn 53.3 al 43.5 C 1.7 Ni 1.5 Make a ratio. During smelting, in order to make the alloy composition as uniform as possible, an induction melting furnace is selected, and in order to prevent the reaction between metal aluminum and the crucible, a boron nitride crucible is selected during induction smelting. The steps of pre-pumping, scrubbing and high-vacuumizing the induction melting furnace make the chamber pressure at 10 -5 Pa, repeated smelting 3-4 times under this vacuum condition to obtain Mn with uniform composition 53.3 al 43.5 C 1.7 Ni 1.5 Master alloy ingot. The master alloy ingot obtained after smelting was ground with a grinding wheel to remove the surface scale, and then mechanically crushed to obtain a soybean-sized block alloy for rapid melt quenching in a quartz tube. Before the rapid quenching, the broken alloy is alternately ...

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Abstract

The invention relates to a MnAlC-based high coercive force permanent magnetic material and a preparation method thereof. The preparation method comprises the following steps of proportioning raw materials and preparing a master alloy; crushing a master alloy ingot obtained after smelting, cleaning surface impurities and carrying out drying treatment to obtain a crushing block alloy; placing the obtained crushing block alloy into a quartz tube, carrying out melting treatment under the vacuum condition and the protective atmosphere, and preparing an alloy ribbon through the alloy in the molten state; carrying out heat treatment on the alloy ribbon; and lastly, carrying out ball-milling treatment on the treated alloy ribbon under the action of a surfactant to obtain the MnAlC-based high coercive force permanent magnetic material. In comparison with the prior art, the small-radius atomic carbon is introduced for stabilizing a magnetic phase by means of element doping control, the boundary of a magnetic domain is pinned by the transition metals, a balance between the magnetic performance and the price is sought without using the rare earth element; the surfactant is introduced to assist ball milling, so that the coercive force of the material is greatly improved.

Description

technical field [0001] The invention relates to a permanent magnet material, in particular to a MnAlC-based high-coercivity permanent magnet material and a preparation method thereof. Background technique [0002] As a functional material, permanent magnet materials are playing an increasingly important role in today's intelligent and electrified world. According to coercivity and saturation magnetization, permanent magnet materials can be divided into rare earth permanent magnets (NdFeB system and SmCo system), ferrite permanent magnets (barium ferrite, strontium ferrite, etc.) and other permanent magnets. Magnetic alloy (Fe-Cr-Co system, Al-Ni-Co system, etc.). Among them, rare earth permanent magnets have excellent magnetic properties unmatched by other materials because they contain rare earth elements such as Nd and Sm with super large magnetic moments. However, as a non-renewable strategic resource, rare earth resources are increasingly scarce and expensive as they a...

Claims

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Application Information

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IPC IPC(8): H01F1/058H01F1/06B22F9/04
CPCB22F9/04B22F2009/043H01F1/058H01F1/06
Inventor 陆伟牛俊超王韬磊向震夏卡达马尚军
Owner TONGJI UNIV
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