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Processing method of R-T-B series alloy powder for radiation magnetic loop

A treatment method and alloy powder technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problem of low forming rate at one time, achieve high forming rate at one time, uniform density, and wide application range

Active Publication Date: 2009-05-06
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The special orientation molding method of the radiant ring (whether it is bipolar or quadruple charging) leads to higher requirements for the fluidity and formability of rare earth alloy powders. Traditional stearic acid or stearate and Organic solvents such as n-paraffins and iso-paraffins mentioned in the above patents are added to the powder as lubricants or molding agents, and the one-time molding rate of radiation ring pressing is very low.

Method used

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  • Processing method of R-T-B series alloy powder for radiation magnetic loop
  • Processing method of R-T-B series alloy powder for radiation magnetic loop
  • Processing method of R-T-B series alloy powder for radiation magnetic loop

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]The raw material alloy is prepared by strip stripping method, and its composition is 5.0Pr-22.0Nd-4.8Dy-0.2Al-0.1Cu-0.5Co-0.2Ga-0.1Zr-1.0B-balance Fe. Next, a hydrogen crushing treatment was performed to allow the raw material alloy to absorb hydrogen at room temperature, and dehydrogenation was performed in an Ar atmosphere at 500° C. for 1 hour. Add 0.1wt.% aluminum stearate and paraffin wax and mix for 1 hour. After jet milling, powder particles with an average particle size of 4 μm are obtained, and then sieved with 60 and 300 meshes to obtain powder 1 with uniform particle size distribution. Compare untreated and treated rough product parameters.

[0031] Untreated: powder 1 was formed on a quadrupole pair charging machine with a forming pressure of 50 MPa and an applied magnetic field of 1.0 T; the isostatic pressure was 200 MPa; then sintered at 1080 ° C for 5 hours, aged at 900 ° C for 2 hours, 600 ℃ aging for 3 hours.

[0032] Treatment: annealing the powder 1...

Embodiment 2

[0036] The raw material alloy is prepared by strip stripping method, and its composition is 5.0Pr-22.0Nd-4.8Dy-0.2Al-0.1Cu-0.5Co-0.2Ga-0.1Zr-1.0B-balance Fe. Next, a hydrogen crushing treatment was performed to allow the raw material alloy to absorb hydrogen at room temperature, and dehydrogenation was performed in an Ar atmosphere at 500° C. for 1 hour. Add 0.1wt.% zinc stearate and triglyceride and mix for 1 hour. After jet milling, powder particles with an average particle size of 4 μm are obtained, and then passed through 60 and 300 mesh sieves to obtain powder 1 with uniform particle size distribution. Compare untreated and treated rough product parameters.

[0037] Untreated: powder 1 was formed on a quadrupole pair charging machine with a forming pressure of 50 MPa and an applied magnetic field of 1.0 T; the isostatic pressure was 200 MPa; then sintered at 1080 ° C for 5 hours, aged at 900 ° C for 2 hours, 600 ℃ aging for 3 hours.

[0038] Processing: annealing the po...

Embodiment 3

[0042] The raw material alloy is prepared by strip stripping method, and its composition is 5.0Pr-22.0Nd-4.8Dy-0.2Al-0.1Cu-0.5Co-0.2Ga-0.1Zr-1.0B-balance Fe. Next, a hydrogen crushing treatment was performed to allow the raw material alloy to absorb hydrogen at room temperature, and dehydrogenation was performed in an Ar atmosphere at 500° C. for 1 hour. Add 0.01wt.% aluminum stearate and paraffin wax and mix for 1 hour, and the average particle diameter obtained after jet milling is 1 μm (the specific surface area is 1.5m 2 / g) powder particles, and then through 60 and 300 mesh sieves to obtain powder 1 with uniform particle size distribution. Compare untreated and treated rough product parameters.

[0043] Untreated: powder 1 was formed on a quadrupole pair charging machine with a forming pressure of 50 MPa and an applied magnetic field of 1.0 T; the isostatic pressure was 200 MPa; then sintered at 1080 ° C for 5 hours, aged at 900 ° C for 2 hours, 600 ℃ aging for 3 hours....

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Abstract

The invention provides an R-T-B system alloy powder treatment method for radiation magnetic rings. The method comprises the following steps: raw alloy is melted in vacuum or inert gas so as to cast an ingot; a raw alloy ingot is subjected to coarse or hydrogen crushing in inert atmosphere; any two substances selected from polyethylene oxide composite polymers, fatty acid, fatty acid derivatives and hydrocarbon are added to and mixed with powder after coarse or hydrogen crushing; alloy coarse powder is subjected to micro-grinding in a nitrogen environment by use of a jet mill; the alloy powder is annealed in inert gas, vacuum or reducing atmosphere; carbonyl iron powder and at least one alicyclic hydrocarbon are added to and mixed with the annealed alloy powder; the mixed powder is taken to form an annular formed body in a magnetic field; the annular formed body is sintered in vacuum or inert gas atmosphere. The method has the advantages that the method is uniform in the density of the radiation ring, high in one-time molding rate and wide in pressure application range, increases the magnetic energy product of the radiation ring, and improves surface magnetic uniformity.

Description

technical field [0001] The invention relates to a processing method for rare earth alloy powder, in particular to a processing method for R-T-B series alloy powder for a radiation magnetic ring. Background technique [0002] At present, the requirements for high performance of magnets are increasing day by day, so the requirements for rare earth alloy powders are also higher and higher, such as high fluidity and excellent compression molding performance. In patents CN0280727.6 and 96190684.7, the rare earth alloy powder is mixed with organic solvents such as n-butene and ethylene glycol to form a slurry for granulation, and the granulation powder effectively improves the R-Fe-B alloy powder. The fluidity and formability of the powder, and the binder can be effectively removed in the subsequent sintering process, and the coarse granulated powder requires higher pressure on the press. In patent CN200310100706.7, a mixture such as mineral oil is added to the powder, and the sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04B22F3/10C21D9/40
Inventor 陈国安王浩颉王湛钮萼饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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