Method for preparing biphase rare-earth permanent magnet material using hydrogenation heat treatment process

A rare earth permanent magnet and heat treatment technology, which is applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc. The problem is that the production equipment and process are simple and simple, the content of rare earth elements is low, and the cost is low.

Inactive Publication Date: 2006-02-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the soft magnetic phases α-Fe and Fe 3 B increases the remanent magnetization of nano-two-phase permanent magnets, but the coercive force also decreases with the addition of soft magnetic phase, generally less than 450kA / m, which affects its application in many occasions, especially when the magnet is thin
Moreover, due to the limitations of the current preparation methods, the crystal structure of the magnetic powder is difficult to achieve the microstructure required in the theoretical model, that is, the two-phase crystals are continuous, the size is about 10nm, there is no non-magnetic phase between the two phases, and they are completely coupled.
Therefore, the maximum magnetic energy product of the material can only reach 158kJ / m -3 , which is far from the theoretical value and cannot meet the requirements of high-performance magnets
The above factors prevent the material from being widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using Fe, Nd, Dy and 20wt% B-Fe alloy with a purity of 99.9% as raw materials, according to Nd 8.5 Dy 1 Fe 84.5 B 6 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -3 Pa, then pass through 1.2×10 5 The high-purity argon gas of Pa is smelted three times under the protection of argon gas to ensure that the ingot with uniform composition is obtained. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of rare earth elements during the smelting process. Then, the alloy ingot is put into the quick quenching furnace, and the vacuum is evacuated until the vacuum degree in the quick quenching furnace cavity is 10 -3 Pa, then pass through 0.5×10 5 Pa high-purity argon gas, after the ingot is arc-melted under the protection of high-purity argon gas, it is sprayed onto a molybdenum roller with a surface speed of 35m / s to obtain a rapid quenching alloy. Under the protect...

Embodiment 2

[0025] Using Fe, Nd, Pr, Zr and 20wt% B-Fe alloy with a purity of 99.9% as raw materials, according to Nd 3.6 PR 5.4 Fe 84 Zr 1 B 6 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -3 Pa, then pass through 1.2×10 5 The high-purity argon of Pa is smelted three times under the protection of argon to ensure that the ingot with uniform composition is obtained. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of rare earth elements during the smelting process. Then, the alloy ingot is put into the quick quenching furnace, and the vacuum is evacuated until the vacuum degree in the quick quenching furnace cavity is 10 -3 Pa, then pass through 0.5×10 5 Pa high-purity argon gas, after the ingot is arc-melted under the protection of high-purity argon gas, it is sprayed onto a molybdenum roller with a surface speed of 35m / s to obtain a rapid quenching alloy. Under the prote...

Embodiment 3

[0027] Using Fe, Nd, Co, Cr and 20wt% B-Fe alloy with a purity of 99.9% as raw materials, according to Nd 12.5 Fe 69.5 co 10 Cr 2 B 6 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -3 Pa, then pass through 1.2×10 5 The high-purity argon gas of Pa is smelted three times under the protection of argon gas to ensure that the ingot with uniform composition is obtained. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of rare earth elements during the smelting process. Under the protection of high-purity argon, the ingot is broken with a crusher, and then the ingot powder with a particle diameter of less than 110 microns is sieved for high-energy ball milling (the particle diameter is preferably 50-90 microns). Under a protective atmosphere, the sieved ingot powder and iron powder (99.9% in purity and less than 15 microns in particle diameter) are uniformly mixed, wher...

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Abstract

The invention discloses a preparing method of high-performance double-phase, rare-earth, permanent magnetic material by hydrogenation thermal treatment. Firstly, it adopts vacuum welting method to prepare alloy; secondly, adopts fast quenching method or mechanical alloying method to prepare prealloy powder; then, places the prealloy powder in a hydrogen processing device, vacuumize the device and charges in hydrogen for hydrogen absorption and dehydrogenation reactions at 600-1000 deg.C; and finally, adopts adhesion process, cold press process, and thermal press or thermal stress process to prepare an alloyed magnet. It has better synthetic permanent magnetic performance, and its producing device and process are simple, and the consumption of process is low.

Description

technical field [0001] The invention relates to a method for preparing a two-phase rare earth permanent magnet material by a hydrogenation heat treatment method. Background technique [0002] Rare earth bonded magnet is a magnetic material made of magnetic rare earth alloy powder bonded with organic or soft metal binder. Rare earth bonded magnets have a high performance-price ratio, can be directly formed or processed into components with complex shapes, have high toughness, are not easy to break, crack, and have small deviations in magnetic properties, which meet the high performance requirements of magnetic materials in recent years. The requirements of globalization and low price, so its total sales can grow rapidly. The magnetic properties of rare earth bonded magnets are affected by the properties of the magnetic powder and the bonding density, among which the magnetic properties of the powder are considered to be the first factor. At present, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02B22F9/04
Inventor 严密王晨赵传礼文玉华罗伟
Owner ZHEJIANG UNIV
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