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A kind of neodymium-iron-boron magnet containing low-melting-point dysprosium-nickel alloy and its preparation method

A technology of neodymium-iron-boron and nickel alloys, which is applied in the fields of magnetic objects, inductors/transformers/magnets, and magnetic materials. Coercive force, the effect of improving coercive force

Active Publication Date: 2019-07-30
严高林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the metal element zinc in this method is relatively active and not resistant to acid, while nickel has the characteristics of wear resistance, corrosion resistance and rust resistance, so dysprosium zinc alloy is not suitable for long-term use

Method used

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  • A kind of neodymium-iron-boron magnet containing low-melting-point dysprosium-nickel alloy and its preparation method
  • A kind of neodymium-iron-boron magnet containing low-melting-point dysprosium-nickel alloy and its preparation method
  • A kind of neodymium-iron-boron magnet containing low-melting-point dysprosium-nickel alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Will Dy 85 Ni 15 (Mass percentage content) The alloy is smelted by an electric arc furnace, then mechanically crushed to coarse particles, and then kerosene is used as a medium to ball-mill the coarse particles into a fine powder of 4 microns. Will prepare Dy 85 Ni 15 Alloy fine powder added to Nd 13.5 Fe 79.75 B 6.75 In the powder, the addition ratio is Nd 13.5 Fe 79.75 B 6.75 4% of powder mass, evenly mixed with DyNi alloy powder. The uniformly mixed powder is subjected to a pulsed magnetic field with a magnetic induction intensity of 4.5T and a pulsed magnetic field of 1200kg / cm 2 Press molding under isostatic pressure to obtain a compact; put the compact into a vacuum sintering furnace, raise the temperature to 1010°C at a rate of 700°C / h, and then rise to 1060°C at 100°C / h. Sintering and heat treatment are performed at 1060°C for 2-4 hours under vacuum, followed by annealing at 900°C for 1 hour, secondary annealing at 650°C for 1 hour, and cooling to fina...

Embodiment 2

[0026] Using Dy 80 Ni 20 , Dysprosium-nickel alloy fine powder with a particle size of 2 microns, and then use the same process as in Example 1 to prepare an NdFeB magnet as a comparative experiment.

Embodiment 3

[0028] Using Dy 70 Ni 30 , Dysprosium-nickel alloy fine powder with a particle size of 1 micron, and then use the same process as in Example 1 to prepare an NdFeB magnet as a comparative experiment.

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Abstract

The invention provides a neodymium-iron-boron magnet containing a low-melting-point dysprosium-nickel alloy. The mass percent of the DyNi alloy in the magnet is 3-7%. The preparation method of the neodymium-iron-boron magnet includes the steps that (1), the DyNi alloy is smelted through an electric arc furnace, broken and ground into fine powder with the diameter smaller than 5 microns; (2), the DyNi alloy fine powder is added into neodymium-iron-boron powder according to the mass percent, and the materials are mixed to be uniform; (3), the uniformly-mixed powder is press-formed under a pulsedmagnetic field and static isopressure, and a pressing blank is obtained; (4), the pressing blank is put in a vacuum sintering furnace, the temperature is raised to 1,010 DEG C at the heating rate of600-800 DEG C / h, then the temperature is raised to 1,060 DEG C at the heating rate of 50-150 DEG C / h, sintering is carried out for 2-4 hours, then annealing is carried out for 1-2 hours at the temperature of 900 DEG C, annealing is carried out for 1-2 hours at the temperature of 650 DEG C, cooling is carried out, and the magnet is obtained. The operation is convenient, process conditions are simple and convenient, the product quality is stable, the use quantity of rare earth alloys is small, and the production cost is low.

Description

technical field [0001] The invention relates to a neodymium-iron-boron permanent magnet and a preparation method thereof, in particular to a neodymium-iron-boron magnet containing low melting point dysprosium-nickel alloy and a preparation method thereof. Background technique [0002] The role of rare earth permanent magnets in various technologies is increasing day by day, and this trend is still continuing. Many "green technologies", such as wind power generation, electric vehicles require a large number of rare earth permanent magnets, because this magnet has the largest magnetic energy density (usually defined as (BH)max) and high coercive force. Sintered Nd-Fe-B magnets are used in many technologies due to their excellent magnetic properties, such as sensors, motors, engines, etc. Sintered Nd-Fe-B magnets also play an important role in hybrid and pure electric vehicles, which require magnets with high coercive force to enable them to be used in electric motors at high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08
CPCH01F1/0577H01F41/0293
Inventor 严高林艾弗雷克斯哈里斯
Owner 严高林
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