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Permanent magnetic material in heat-resistant R-Fe-D series, and preparation method

A permanent magnet material and heat-resistant technology, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., to achieve the effect of improving heat resistance, improving coercive force and high temperature performance, and making the process easy to realize

Inactive Publication Date: 2007-08-29
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above materials have made great improvements in the heat resistance of R-Fe-B, further research is needed for R-Fe-B permanent magnet materials that work above 200 °C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Alloy composition: 11.7Nd2Dy2Tb5.5Co1.3Nb1Cu2GaB9 Fe, that is, the atomic percentage composition is 11.7% Nd, 2% Dy, 2% Tb, 5.5% Co, 1.3% Nb, 1% Cu, 2% Ga, 9% B, more than The amount is Fe and unavoidable impurities. During the preparation, the alloy is batched according to the name, vacuum melting is carried out, and then rough grinding and fine grinding are carried out in N2 gas to obtain alloy powder with an average particle size of 5 μm.

[0020] The alloy powder is mixed with a small amount of antioxidant and lubricant, and then pressed, with a pressure of 4.6MPa and a pulsed magnetic field of 6T. The compact is subjected to 200MPa isostatic pressing, and then vacuum sintering. Vacuum sintering at 1100°C for 2h, tempering at 900°C for 1h, and tempering at 600°C for 1h. Both sintering and tempering are rapidly cooled to room temperature by gas quenching. The surface of the sintered billet is polished and magnetized to obtain a round rod of Φ10×10. The magnetic p...

Embodiment 2

[0028] Alloy composition: 10.5Nd1Dy9Co2Nb1Cu2Ga2Tb6.2B with Fe remaining.

[0029] The preparation process is the same as that of Example 1, processed into a Φ20×14 round bar, magnetized, and the magnetic properties are shown in Table 2, and the comparison sample is the same as Example 1.

[0030] Table 2

[0031] Br / T

Embodiment 3

[0033] Alloy composition: 9Nd3Dy9Co2Nb1Cu2Ga2Tb6B with Fe remaining.

[0034] The preparation process is the same as that of Example 1, processed into a round bar of Φ10×10, magnetized, and the magnetic properties are shown in Table 3, and the comparison sample is the same as Example 1.

[0035] table 3

[0036] Br / T

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PUM

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Abstract

A refractory permanent-magnet R-Fe-B material is proportionally prepared from R, Co, Nb, Ga, Cu, B and Fe. Its advantages are high resistance to high temp, high cohesive coercive force, high magnetic energy product, and high residual magnetism. Its preparing process is also disclosed.

Description

technical field [0001] A heat-resistant R-Fe-B series permanent magnet material relates to a compound metal rare earth permanent magnet material, especially an R-Fe-B permanent magnet material with high heat resistance. Background technique [0002] In recent years, efforts have been made to study the heat resistance of R-Fe-B. A heat-resistant R-Fe-B material is introduced in "Heat-resistant R-Fe-B permanent magnet material and its manufacturing method" (CN1067134A) applied by Lian Fazeng, whose characteristics are: -Based on B, add Co, Mo, Al, and Dy 2 o 3 , so that this material can work at 200°C, α=-0.078% / °C, Wirr200°C=-6.0%. The NdFeB material introduced by Shi Yongjin in "A heat-resistant NdFeB permanent magnet material and its preparation method" (CN1308344) is characterized by: on the basis of R-Fe-B, Co, Ga, Nb, It is α=-0.048% / °C of the material at 150°C, which makes the material have good temperature stability at the working point of 150°C. Although the abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057C22C38/12
Inventor 周济孙明炜罗建军贺新杰谈萍张晗亮孙杏囡
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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