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Method for improving magnetic performance of rare-earth neodymium iron boron

A rare earth neodymium iron boron and magnetic performance technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of high cost and limited resources, and achieve the effect of reducing dosage, low energy consumption, and improving magnetic performance

Active Publication Date: 2018-04-10
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of high cost and limited resources of the method for improving the magnetic properties of rare earth NdFeB by adding heavy rare earth elements, the present invention provides a method for improving the magnetic properties of rare earth NdFeB with low cost and simple process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composition is (Nd, Pr) 29.5 Dy 2 co 2 Cu 0.15 Al 1 Nb 0.3 Fe 余 B 0.95 (wt%) NdFeB permanent magnet material alloy, batching is carried out according to above-mentioned composition and makes NdFeB permanent magnet material alloy with quick-setting sheet technology;

[0031] (1) The above-mentioned rare earth NdFeB permanent magnet material alloy is crushed by a crushing process combining hydrogen crushing and jet milling to obtain a powder with a particle size of 2 μm;

[0032] (2) Based on the total mass of the powder, add 5‰ of an antioxidant to the powder, carry out low-temperature mixing at 10°C, and control the mixing time at 60 minutes to obtain the mixed powder;

[0033] (3) The mixed powder is subjected to low-temperature passivation at 10° C., and the passivation time is controlled at 8 hours;

[0034] (4) Inject the passivated powder in step (3) into the mold under nitrogen protection, set the magnetic field strength to 1.2T, and the pressure to 5M...

Embodiment 2

[0048] The composition is (Nd, Pr) 30 Dy 0.8 co 1 Cu 0.2 Al 0.1 Nb 0.2 Fe 余 B 0.96 (wt%) NdFeB permanent magnet material alloy, batching is carried out according to above-mentioned composition and makes NdFeB permanent magnet material alloy with quick-setting sheet technology;

[0049] (1) The above-mentioned rare earth NdFeB permanent magnet material alloy is crushed by a crushing process combining hydrogen crushing and jet milling to obtain a powder with a particle size of 100 μm;

[0050] (2) The above-mentioned powder is mixed at -10°C at low temperature, and the mixing time is controlled at 100min to obtain the mixed powder;

[0051] (3) The mixed powder is subjected to low-temperature passivation at -10°C, and the passivation time is controlled at 12h;

[0052](4) Inject the passivated powder in step (3) into the mold under nitrogen protection, set the magnetic field strength to 2T, and the pressure to 15MPa to perform orientation molding to obtain a green body o...

Embodiment 3

[0066] The composition is (Nd, Pr) 26.5 Dy 4.5 co 1.5 Cu 0.2 Al 0.6 Nb 0.3 Fe 余 B 0.96 (wt%) NdFeB permanent magnet material alloy, batching is carried out according to above-mentioned composition and makes NdFeB permanent magnet material alloy with quick-setting sheet technology;

[0067] (1) The above-mentioned rare earth NdFeB permanent magnet material alloy is crushed by a crushing process combining hydrogen crushing and jet milling to obtain a powder with a particle size of 50 μm;

[0068] (2) Based on the total mass of the powder, add 2.5‰ of anti-oxidant to the powder, and carry out low-temperature mixing at 0° C., and the mixing time is controlled at 80 minutes to obtain the mixed powder;

[0069] (3) The mixed powder is subjected to low-temperature passivation at 0° C., and the passivation time is controlled at 10 hours;

[0070] (4) Inject the passivated powder in step (3) into the mold under the protection of nitrogen, set the magnetic field strength to 1.8T...

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Abstract

The invention relates to the technical field of rare-earth neodymium iron boron permanent magnet materials, in particular to a method for improving the magnetic performance of rare-earth neodymium iron boron. The method comprises the following steps of crushing, low-temperature antioxidant mixing, low-temperature passivation, forming, vacuum sintering and tempering. The method for improving the magnetic performance of the rare-earth neodymium iron boron has the advantages of being simple in process, low in energy consumption and safer in production, meanwhile, the product performance consistence is high, the consumption of heavy rare earth is reduced, and the material cost is reduced. By means of the method, the magnetic performance of the rare-earth neodymium iron boron can be effectivelyimproved.

Description

technical field [0001] The invention relates to the technical field of rare earth NdFeB permanent magnet materials, in particular to a method for improving the magnetic properties of rare earth NdFeB with low cost and simple process. Background technique [0002] Sintered NdFeB magnet is the permanent magnet material with the strongest comprehensive magnetic properties in the world today. With its excellent characteristics and cost performance surpassing traditional permanent magnet materials, it is widely used in energy, transportation, machinery, medical, computer, home appliances and other fields , play an important role in the national economy. Among the technical indicators of magnetic materials, the magnetic energy product is the most important. The magnetic energy product represents the energy of an external magnetic field generated by a magnet per unit volume. The high magnetic energy product means that smaller magnets can be used on the motor to output more power....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08C22C33/02
CPCC22C33/02H01F1/0577
Inventor 黎龙贵卢慧斌胡烈平李超
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD