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Preparation method of trace nitrogen-containing Re-Fe-B permanent magnetic material

A permanent magnet material, trace technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of unspecified manufacturing methods, affecting the improvement of magnet performance and anti-corrosion performance, etc., to reduce the amount of magnets, corrosion resistance, etc. improved effect

Active Publication Date: 2009-12-30
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Starting from step 4, in the process of crushing, jet milling, mixing, molding, and sintering, the nitrogen content will be gradually increased by contact with nitrogen, so that the nitrogen content of the magnet can reach 400-2000ppm, and the fully sealed process has been disclosed. Under the conditions, the nitrogen content can only be guaranteed to be within 436-675ppm, which will affect the improvement of the performance of the magnet and the improvement of anti-corrosion performance
At present, in the patent literature, it is only mentioned that nitrogen is an unavoidable existence in the magnet as an impurity element, and neither the effect of making the magnet contain a trace amount of nitrogen (≤300ppm) nor the manufacturing method of making the magnet contain a trace amount of nitrogen (≤300ppm)

Method used

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  • Preparation method of trace nitrogen-containing Re-Fe-B permanent magnetic material
  • Preparation method of trace nitrogen-containing Re-Fe-B permanent magnetic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Raw materials are made of various pure metals Nd, Pr, Dy, Al, Ga.Co, Fe and alloys B-Fe, Nb-Fe, etc. according to the design formula requirements;

[0026] (2) Various raw materials are formed into molten alloy by vacuum smelting, and then the molten alloy is cast and cooled on a quenched copper roller with a line speed of 1m / s, so that the molten steel forms a 0.3mm thick quick-setting thin strip;

[0027] (3) Hydrogen pulverization: Put the quick-setting thin strip into a rotary hydrogenation furnace, raise the temperature to 100°C and keep it warm for 30 minutes, fill it with an argon atmosphere with a partial pressure of 0.03 to absorb hydrogen, and the hydrogen absorption pressure is 0.1MPa. Use vacuum high temperature 480°C to dehydrogenate and fill with 0.01Mpa partial pressure argon every 30 minutes, and finally dehydrogenate to a vacuum degree below 0.5pa. After dehydrogenation, use reactor air cooling or water cooling to cool the hydrogenated powder to room...

Embodiment 2

[0034] Hydrogen pulverization in step (3): Put the quick-setting thin strip into a rotary hydrogenation furnace, raise the temperature to 200°C and keep it warm for 60 minutes, fill it with an argon atmosphere with a partial pressure of 0.05 to absorb hydrogen, and the hydrogen absorption pressure is 0.2MPa, When hydrogen is dehydrogenated, use vacuum high temperature 580°C to dehydrogenate and fill it with 0.05Mpa partial pressure argon every 30 minutes, and finally dehydrogenate to a vacuum degree below 0.5pa. After dehydrogenation, use reactor air cooling or water cooling to cool the hydrogenated powder At room temperature, keep the hydrogen content of the hydrogenated powder at 500ppm, so that the hydrogenated powder leaves a small amount of hydrogen and has a reducing atmosphere during sintering without the hydrogen content being too high, so that the Re-Fe-B powder can absorb nitrogen during the process;

[0035] Step (7) sintering, sintering the compact in a vacuum sinte...

Embodiment 3

[0038]Hydrogen pulverization in step (3): Put the quick-setting thin strip into a rotary hydrogenation furnace, raise the temperature to 150°C and keep it warm for 45 minutes, fill it with an argon atmosphere with a partial pressure of 0.04 to absorb hydrogen, the hydrogen absorption pressure is 0.15MPa, When hydrogen is dehydrogenated, use vacuum high temperature 500°C to dehydrogenate and fill it with 0.04Mpa partial pressure argon every 18 minutes, and finally dehydrogenate to a vacuum degree below 0.3pa. After dehydrogenation, use reactor air cooling or water cooling to cool the hydrogenated powder At room temperature, the hydrogen content of the hydrogenated powder is 550ppm, so that the hydrogenated powder leaves a small amount of hydrogen and has a reducing atmosphere during sintering without the hydrogen content being too high, so that the Re-Fe-B powder can absorb nitrogen during the process;

[0039] Step (7) sintering, sintering the compact in a vacuum sintering furn...

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Abstract

The invention relates to a preparation method of trace nitrogen-containing permanent magnetic material. The method comprises the following steps: (1) mixing raw materials according to designed formula requirements, (2) quickly hardening flakes, (3) performing hydrogen decrepitation, (4) crushing in low-temperature nitrogen protection or argon protection, (5) jet milling in low-temperature nitrogen protection or argon protection, (6) mixing, (7) shaping, (8) sintering, (9) aging and (10) processing and detection; all material conversion processes are controlled by full sealing. The rare earth permanent magnet prepared by the method only contains trace nitrogen, and anticorrosion property of the magnet is greatly enhanced.

Description

technical field [0001] The invention relates to a method for preparing a rare earth permanent magnet material, in particular to a method for preparing a Re-Fe-B system permanent magnet material containing a trace amount of nitrogen. Background technique [0002] to Re 2 Fe 14 The sintered Re-Fe-B rare earth magnet with B-type compound as the main phase is known as the highest performance permanent magnet material and has been widely used in energy, transportation, machinery, medical, computer, home appliances and other fields. In order to adapt to the development trend of today's light, thin and small products, the performance of magnets is required to be greatly improved. In the current prior art, the hydrogen crushing method is used to manufacture high-performance sintered Re-Fe-B permanent magnet materials, and the nitrogen content cannot be controlled within 300 ppm. After crushing the Scale Ribbon (SC) alloy by absorbing hydrogen under a hydrogen atmosphere, there is...

Claims

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Application Information

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IPC IPC(8): H01F1/057B22F3/16C22C1/02C22C33/04B22D11/06
Inventor 熊永飞衣晓飞陈静武
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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