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Preparation method of NdFeB rare earth permanent magnet material

A rare earth permanent magnet, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of poor coercivity of rare earth permanent magnet materials

Active Publication Date: 2020-03-06
京磁材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coercive force of the existing NdFeB rare earth permanent magnet materials is not good and needs to be improved

Method used

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  • Preparation method of NdFeB rare earth permanent magnet material
  • Preparation method of NdFeB rare earth permanent magnet material

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Embodiment 1

[0023] The invention provides a method for preparing a neodymium iron boron rare earth permanent magnet material, comprising the following steps:

[0024] Step 1. Mix the praseodymium-neodymium alloy, boron, copper, cobalt, dysprosium, aluminum, europium, indium, and iron according to the weight ratio of 23.07:1.22:0.76:0.31:2.1:1.3:0.08:0.64:70.52 and then melt and cast to obtain the first an alloy sheet;

[0025] Step two, the ErF 3 and TbF 3 According to the mass ratio of 2:3, it is mixed and heated to a constant temperature of 1400°C to obtain a molten liquid. The first alloy sheet is first subjected to saturated hydrogen absorption treatment, and then dehydrogenated at a temperature of 650°C for 2 hours, and then placed in the molten liquid. And pass argon gas into the molten liquid until the temperature reaches 1650 ° C and keep it warm for 3 hours, then cool to room temperature to obtain the second alloy sheet; when passing argon gas in step 2, use a ventilation devic...

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Abstract

The invention discloses a preparation method of a Nd-Fe-B rare earth permanent magnet material, comprising the following steps: step 1, preparing a first alloy sheet; 2, mix ErF3 and TbF3 according toa mass ratio of 2: 3, heating to a constant temperature of 1400 DEG C to obtain a molten liquid, and placing that first alloy in the molten liquid to obtain a second alloy sheet; 3, feed that secondalloy casting sheet into an intermediate frequency induction heat furnace to obtain an alloy liquid, adding indium powder into the alloy liquid, uniformly stirring, and casting to form a third alloy sheet; 4, crushing the third alloy sheet in a nitrogen protective atmosphere to obtain mixed magnetic power, pressing the mixed magnetic powder into a thin blank, sinter, and tempering to obtain a NdFeB rare earth permanent magnet material. The coercivity of the Nd-Fe-B rare earth permanent magnet material prepared by the invention reaches 31.14 KA / m, which is 8.8% higher than that of the prior art.

Description

technical field [0001] The invention relates to the field of magnetic material preparation, in particular to a preparation method of NdFeB rare earth permanent magnet material. Background technique [0002] Generally speaking, rare earth permanent magnets are those with strong magnetic force including R-Fe-B sintered magnets (where R represents rare earth elements including neodymium (Nd), dysprosium (Dy), or terbium (Tb), or a combination thereof). Magnet, which endows the motor with high power and reduced size, so its range of applications is gradually widening. Rare earth permanent magnets can exert 3 to 5 times improved magnetic force compared to conventional ferrite magnets. Meanwhile, the magnetic properties of the magnet can be expressed as residual magnetic flux density and coercive force. The residual magnetic flux density is determined by the proportion, density and magnetic orientation of the main phase of the rare earth permanent magnet, while the coercive forc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057B22F9/04B22F3/02B22F3/10B22F3/24C22C38/16C22C38/10C22C38/06C22C33/06
CPCB22F3/02B22F3/10B22F3/24B22F9/04B22F2003/248C22C33/006C22C33/06C22C38/002C22C38/005C22C38/06C22C38/10C22C38/16H01F1/0577
Inventor 房宏伟
Owner 京磁材料科技股份有限公司
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