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Method for improving magnetic performance and corrosion resistance of cerium neodymium iron boron sintered magnet simultaneously

A technology of sintered magnets and neodymium cerium iron boron, which is applied in the fields of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., to achieve strong market competitiveness, low cost, and easy industrial preparation

Inactive Publication Date: 2018-06-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although grain boundary structure reconstruction technology has been applied to NdCeFeB sintered magnets to enhance their coercive force, this technology has no effect on the CeFe 2 The effect of grain boundary phase and corrosion resistance has not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) In terms of mass percentage, the composition is (Nd, Pr) 15.4 Ce 15.4 Fe 67.4 co 0.8 B 1 The main alloy containing Ce and the composition is (Nd,Pr) 30.8 Fe 67.4 co 0.8 B 1 The Ce-free main alloys are separately batched, then smelted and obtained two main alloy flakes with an average thickness of 0.26mm by quick-setting casting strips, and then the two flakes are subjected to hydrogen breaking and jet milling respectively to obtain an average particle size of 3μm Ce-containing main alloy magnetic powder and Ce-free main alloy magnetic powder;

[0024] 2) The composition is Nd in atomic percentage 80 PR 20 The neodymium-praseodymium alloy is smelted and quickly solidified to obtain a flake with an average thickness of 0.25mm, and then absorb hydrogen at 375°C for 2.5h to obtain a neodymium-praseodymium hydride, and then jet mill the neodymium-praseodymium hydride Treated to obtain an average particle size of 2.4 μm, and the composition is expressed in terms ...

Embodiment 2

[0031] 1) In terms of mass percentage, the composition is (Nd, Pr) 15.4 Ce 15.4 Fe 67.2 co 0.8 al 0.2 B 1 The main alloy containing Ce and the composition is (Nd,Pr) 30.8 Fe 67.4 co 0.8 B 1 The Ce-free main alloys are separately proportioned, then smelted and obtained two main alloy flakes with an average thickness of 0.3 mm by quick-setting casting strips, and then the two flakes are subjected to hydrogen breaking and jet milling respectively to obtain an average particle size of 3.3μm Ce-containing main alloy magnetic powder and Ce-free main alloy magnetic powder;

[0032] 2) The composition is Nd in atomic percentage 75 PR 25 Melting and quick-setting cast strips of the neodymium-praseodymium alloy to obtain flakes with an average thickness of 0.3mm, and then absorb hydrogen at 400°C for 2 hours to obtain the hydride, and then perform jet milling on the hydride , the average particle size is 3μm, and the composition is calculated as (Nd 75 PR 25 )H β Dypraseod...

Embodiment 3

[0039] 1) In terms of mass percentage, the composition is (Nd, Pr) 15.4 Ce 15.4 Fe 67.08 co 0.8 al 0.2 Cu 0.12 B 1 The main alloy containing Ce and the composition is (Nd,Pr) 30.8 Fe 67.4 co 0.8 B 1 The Ce-free main alloys are separately proportioned, then smelted and obtained two main alloy flakes with an average thickness of 0.34 mm by quick-setting casting strips, and then the two flakes are subjected to hydrogen breaking and jet milling respectively to obtain an average particle size of 3.8μm Ce-containing main alloy magnetic powder and Ce-free main alloy magnetic powder;

[0040] 2) The composition is Nd in atomic percentage 70 PR 30 Melting and quick-setting cast strips of the neodymium-praseodymium alloy to obtain flakes with an average thickness of 0.35mm, and then absorb hydrogen at 425°C for 2 hours to obtain the hydride, and then perform jet milling on the hydride , the average particle size is 3.4μm, and the composition is calculated as (Nd 70 PR 30 )...

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Abstract

The invention discloses a method for improving the magnetic performance and the corrosion resistance of a cerium neodymium iron boron sintered magnet simultaneously. The method is characterized in that a double-main-phase alloy technology is adopted, and a small amount of didymium hydride powder is added during powder mixing for crystal boundary structure reconstructing. Through the introduction of the didymium hydride powder, the distribution of the crystal boundary structure is changed, the phase composition of the crystal boundary structure is also changed, and therefore, the magnetic performance and the corrosion resistance of the cerium neodymium iron boron sintered magnet are improved simultaneously. The didymium hydride powder has the advantage of being easily prepared industrially,raw materials and equipment needed for the didymium hydride powder are didymium alloy used in industrial production of neodymium iron boron, a smelting and melt-spinning furnace, a hydrogen breakingfurnace and an airflow grinding pulverizer. By means of the method for improving the magnetic performance and the corrosion resistance of the cerium neodymium iron boron sintered magnet simultaneously, the advantages of the double-main-phase alloy technology and the crystal boundary structure reconstructing technology are integrated, the magnet cost is effectively lowered while the magnetic performance and the corrosion resistance are guaranteed, the application of cerium in a rail earth permanent magnetic material is further promoted, and the market space is wide.

Description

technical field [0001] The invention relates to a method for simultaneously improving the magnetic performance and corrosion resistance of a sintered neodymium cerium iron boron magnet. Background technique [0002] Sintered NdFeB magnets have the advantages of high remanence, high coercive force and high magnetic energy product. They are the permanent magnet materials with the best comprehensive magnetic properties. They are widely used in consumer electronics, wind power generation and new energy vehicles. Sintered NdFeB magnets consume a large amount of neodymium, praseodymium and a small amount of dysprosium and terbium, and the cost of rare earths accounts for about 80% of the cost of raw materials. In recent years, affected by my country's rare earth industry policy adjustments and supply-side reforms, the prices of rare earths such as neodymium, praseodymium, dysprosium, and terbium have continued to rise, which has brought great economic pressure to NdFeB manufacture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 王新华钱泽宇严密马天宇金佳莹
Owner ZHEJIANG UNIV
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