Low-cost rare-earth-free nanocomposite permanent-magnetic material and preparation method thereof

A technology of nano-composite and permanent magnet materials, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of Mn-Al-C permanent magnet gap and low magnetization intensity, so as to improve the magnetization intensity, increase the magnetic energy product, The effect of simple preparation process

Inactive Publication Date: 2016-09-14
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the magnetic properties of Mn-Al-C permanent magnets in practical applications still have a large gap with their theoretical values.
On the one hand, in the MnAl ferromagnetic phase, since the Al atoms have no magnetic moment, the magnetization of the alloy is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Using electrolytic manganese with a purity of 99.9%, Al with a purity of 99.9%, and analytical carbon with a purity of 99.9% as raw materials, according to Mn 53 Al 45 C 2 Ingredients topping. Induction melting is used to melt the mixed raw materials of Mn, Al, and C into an alloy ingot, and then the electric arc is repeatedly smelted 4 times to ensure the uniformity of the alloy. Take the obtained Mn 53 Al 45 C 2 The master alloy ingot was broken into small pieces and ultrasonically cleaned in alcohol. Put the cleaned small piece of alloy into a quartz tube with a lower end opening and a rectangular mouth with a size of 5.0mm×0.7mm, and draw a vacuum to 3.6×10 -3 Pa, and fill the cavity with high-purity argon for protection, use a high-frequency induction coil to heat it to melt, adjust the current to 15A, and the induction temperature is 1250°C, and spray the molten alloy liquid with high-purity argon after 3 minutes of melting On the high-speed rotating co...

Embodiment 2

[0033] (1) Using electrolytic manganese with a purity of 99.9%, Al with a purity of 99.9%, analytical carbon with a purity of 99.9%, and Ti with a purity of 99.9% as raw materials, according to Mn 52 Al 45 C 2 Ti 1 Composition batching, using induction melting, melting the mixed raw materials of Mn, Al, C and Ti into an alloy ingot, and then using electric arc to melt repeatedly 4 times to ensure the uniformity of the alloy. Take the obtained Mn 52 Al 45 C 2 Ti 1 The master alloy ingot was broken into small pieces and ultrasonically cleaned in alcohol. Put the cleaned small piece of alloy into a quartz tube with a lower end opening and a rectangular mouth with a size of 5.0mm×0.7mm, and draw a vacuum to 3.6×10 -3 Pa, and fill the cavity with high-purity argon for protection, use a high-frequency induction coil to heat it to melt, adjust the current to 15A, and the induction temperature is 1250°C, and spray the molten alloy liquid with high-purity argon after 3 minutes o...

Embodiment 3

[0042] (1) Using electrolytic manganese with a purity of 99.9%, Al with a purity of 99.9%, analytical carbon with a purity of 99.9%, and Ni with a purity of 99.9% as raw materials, according to Mn 52 Al 45 C 2 Ni 1 Composition batching, using induction melting, melting the mixed raw materials of Mn, Al, C and Ni into an alloy ingot, and then using arc melting for 4 times to ensure the uniformity of the alloy. Take the obtained Mn 52 Al 45 C 2 Ni 1 The master alloy ingot was broken into small pieces and ultrasonically cleaned in alcohol. Put the cleaned small piece of alloy into a quartz tube with a lower end opening and a rectangular mouth with a size of 5.0mm×0.7mm, and draw a vacuum to 3.6×10 -3 Pa, and fill the cavity with high-purity argon for protection, use a high-frequency induction coil to heat it to melt, adjust the current to 20A, and the induction temperature is 1350°C. After smelting for 3 minutes, spray the molten alloy liquid with high-purity argon into th...

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Abstract

The invention provides a low-cost rare-earth-free nanocomposite permanent-magnetic material and a preparation method thereof. A chemical formula of the low-cost rare-earth-free nanocomposite permanent-magnetic material is Mn<53-x>Al<45>C<2>W<x>/(Fe<l-y>Co<y>)<2>B. The preparation method comprises the steps of: burdening a pure metal raw material according to the name of an Mn<53-x>Al<45>C<2>W<x> alloy to obtain a master alloy ingot and fabricating a thin strip; carrying out vacuum heat treatment on a quick quenched strip to obtain a tau-phase Mn<53-x>Al<45>C<2>W<x> alloy; carrying out burdening according to (Fe<l-y>Co<y>)<2>B alloy ingredients to obtain the master alloy ingot and fabricating the thin strip; carrying out high-energy ball-milling on the quick quenched strip of the Mn<53-x>Al<45>C<2>W<x> alloy and the quick quenched strip of the (Fe<l-y>Co<y>)<2>B alloy which are subjected to heat treatment to prepare nanocrystalline alloy powder; carrying out spark plasma sintering on the obtained nanocomposite powder to obtain a full-dense nanocomposite permanent-magnetic material; and carrying out thermal deformation on the sintered nanocomposite permanent-magnetic material, improving the degree of orientation and obtaining the low-cost rare-earth-free anisotropic nanocomposite permanent-magnetic material. The prepared permanent-magnetic material does not contain a rare-earth element; the raw material cost is effectively reduced; and meanwhile, the technology is simple, easy to operate and suitable for large-scale mass production.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a low-cost rare earth-free nanocomposite permanent magnet material and a preparation method thereof. Background technique [0002] High-performance permanent magnet materials have been widely used in military equipment, electro-acoustic devices, motors, generators, computer hard disk drives, voice coil motors, nuclear magnetic resonance imaging instruments, microwave communication technology, controllers, instruments and other devices that require permanent magnetic fields and in the device. Rare earth intermetallic compound permanent magnet is currently the best permanent magnet material. For example, the energy product of samarium-cobalt-based magnets has exceeded 30MGOe, and that of NdFeB permanent magnets has reached 59.5MGOe. However, rare earth permanent magnet materials make these high-performance magnets expensive due to their high raw material costs. At the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/047C22C22/00C22C1/04B22F3/105
CPCB22F3/105C22C1/04C22C22/00H01F1/047
Inventor 张朋越陶姗葛洪良刘晓刚
Owner CHINA JILIANG UNIV
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