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Low-cost high-performance preparation method for sintering neodymium-ferrum-boron magnet

A high-performance, neodymium iron boron technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of high cost, large amount of dysprosium or terbium, and achieve the effect of saving cost and saving rare earth resources

Inactive Publication Date: 2018-07-13
NINGBO ZHAOBAO MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods of infiltrating dysprosium and terbium mainly include heavy rare earth alloying or magnet surface diffusion. However, these methods of infiltrating dysprosium and terbium need to consume a large amount of dysprosium or terbium, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Design NdFeB alloy composition: Pr 7 Nd 21.3 Dy 1.0 Tb 0.5 Fe 66.21 Cu 0.25 Ga 0.2 co 2.0 Nb 0.4 al 0.15 B 0.99 (Atomic percent), according to the designed ingredients, where Dy and Tb exist in the form of Dy-Fe alloy and Tb-Fe alloy respectively. In vacuum less than 1×10 -2 Under the condition of Pa and pressure rise rate less than 30Pa / h, put Dy-Fe alloy and Tb-Fe alloy with a purity greater than 99.9wt% into a vacuum induction furnace, heat to 1400°C for melting, remove slag, remove scale, Obtain terbium dysprosium iron alloy. Then put the terbium-dysprosium-iron alloy obtained by smelting into a high-energy ball mill for ball milling to prepare nanometer powder with a particle size less than 800nm ​​for future use. Put other raw materials except Dy-Fe and Tb-Fe alloys into the quick-setting furnace and throw them to make the main alloy flakes with a thickness of 0.25mm; then put the main alloy quick-setting flakes into the hydrogen breaking furnace and p...

Embodiment 2

[0025] Design NdFeB alloy composition: Pr 7 Nd 11.3 Dy 1.0 Tb 0.5 Fe 71.96 co 1.36 Zr 1.00 B 5.88 (Atomic percent), according to the designed ingredients, where Dy and Tb exist in the form of Dy-Fe alloy and Tb-Fe alloy respectively. In vacuum less than 1×10 -2 Under the condition of Pa and pressure rise rate less than 30Pa / h, put Dy-Fe alloy and Tb-Fe alloy with a purity greater than 99.9wt% into a vacuum induction furnace, heat to 1400°C for melting, remove slag, remove scale, Obtain terbium dysprosium iron alloy. Then put the terbium-dysprosium-iron alloy obtained by smelting into a high-energy ball mill for ball milling to prepare nanopowder with particle size less than 700nm for future use. Put other raw materials except Dy-Fe and Tb-Fe alloys into the quick-setting furnace and throw them to make the main alloy flakes with a thickness of 0.3mm; Flow rate 72ml / min, reaction 4 hours, hydrogen breaks and obtains the powder particle of 70 meshes; Then add the anti-o...

Embodiment 3

[0027] Design NdFeB alloy composition: Pr 6 Nd 11.3 Dy 1.0 Tb 0.5 Fe 71.32 al 6 B 3.88 (Atomic percent), according to the designed ingredients, where Dy and Tb exist in the form of Dy-Fe alloy and Tb-Fe alloy respectively. In vacuum less than 1×10 -2 Under the condition of Pa and pressure rise rate less than 30Pa / h, put Dy-Fe alloy and Tb-Fe alloy with a purity greater than 99.9wt% into a vacuum induction furnace, heat to 1400°C for melting, remove slag, remove scale, Obtain terbium dysprosium iron alloy. Then put the terbium-dysprosium-iron alloy obtained by smelting into a high-energy ball mill for ball milling to prepare nanopowder with particle size less than 600nm for future use. Put other raw materials except Dy-Fe and Tb-Fe alloys into the quick-setting furnace and throw them to make the main alloy flakes with a thickness of 0.3mm; Flow rate 74ml / min, reaction 4 hours, hydrogen breaks and obtains the powder particle of 80 meshes; Add the anti-oxidant of 0.20wt%...

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Abstract

The invention discloses a low-cost high-performance preparation method for a sintering neodymium-ferrum-boron magnet. The method comprises the following steps that dysprosium-iron alloy and terbium-iron alloy in raw materials are put into a vacuum melting furnace for smelting together, slags are removed, scale cinders are removed, and terbium-dysprosium-iron alloy is obtained; other raw materialsexcept the dysprosium-iron alloy and terbium-iron alloy are conducted with vacuum melting to obtain main alloy ingot; high energy ball milling is conducted on the terbium-dysprosium-iron alloy to obtain nanometer powder; powder process is conducted on the main alloy ingot to obtain main alloy powder; the obtained nanometer powder and main alloy powder are uniformly mixed in a blender mixer; magnetic field orientation molding is conducted on the mixed powder, and the mixed powder are conducted with isopressing to become a preform body with a density of 4-5 grams per cubic centimeter; the preform body enters into a sintering thermal treatment furnace from an intermediate transition chamber containing inert gases, such as nitrogen or argon and the like, and the high-performance magnet is prepared after high-temperature vacuum sintering, vacuum aging heat treatment and intermittent air cooling are conducted. The low-cost high-performance preparation method for sintering the neodymium-ferrum-boron magnet has the advantages that the magnet prepared by the method needs a less amount of dysprosium or terbium, the cost is low, and the performance of the prepared magnet is high.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, more specifically, it relates to a preparation method of a low-cost and high-performance sintered NdFeB magnet. Background technique [0002] In 1983, on the basis of extensive research on RE-Fe-X ternary alloys, Sagawa Masato and others in Japan prepared a magnetic energy product as high as 290kJ / m by powder metallurgy. 3 The advanced Nd-Fe-B (Nd-Fe-B) sintered Nd-Fe-B magnets created the third generation of rare earth permanent magnet materials. Sintered Nd-Fe-B is widely used in military equipment, electroacoustic devices, motors, generators, computer hard disk drives (HDD), voice coil motors (VCM), human magnetic resonance imaging (MRI), microwave communication technology, controllers , instruments, magnetic separation equipment, magnetic chucks and other devices and equipment that require permanent magnetic fields. [0003] Sintered NdFeB magnets are based on ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057H01F1/08C22C38/16C22C38/10C22C38/12C22C38/06
CPCC22C38/002C22C38/005C22C38/06C22C38/10C22C38/12C22C38/16H01F1/0577H01F41/0293
Inventor 贺琦军林建强
Owner NINGBO ZHAOBAO MAGNET