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High anti-high temperature HDDR neodymium iron boron anisotropic magnetic powder

An anisotropic magnetic, NdFeB technology, applied in magnetic materials, magnetic objects, inductor/transformer/magnet manufacturing, etc., can solve the problem of low coercivity iHc, poor temperature coefficient of Nd-Fe-B magnetic powder, Unsatisfactory structure and other problems, to achieve the effect of grain size refinement, uniform microstructure, and good popularization and application value

Inactive Publication Date: 2010-05-12
LUOHE SANXIN RARE EARTH PERMANENT MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature coefficient of the ternary component Nd-Fe-B magnetic powder produced by the existing method is relatively poor, and the maximum operating temperature is only 80-100°C. In practical applications, such as instruments and meters, the temperature stability of the magnet is relatively high High; and due to the unsatisfactory microstructure of the existing magnetic powder, its coercive force iHc is low, which are far from meeting the needs of practical applications, thus restricting its further development to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The magnetic powder of this embodiment is Nd 13 (Fe 0.95 co 0.05 ) 60.5 B 6.5 , its preparation method comprises the following steps, according to (Nd 1-x Dy x ) 13 (Fe 1-y co y ) 60.5 B 6.5 (at%), wherein x=0, y=0.05, with metal neodymium 3N, boron iron (17.5B), electrolytic cobalt, pure iron Dt-4 ingredients, mix evenly, place in a vacuum induction furnace, in high-purity argon It is melted in an atmosphere of gas, cast into alloy ingots with a thickness of 20mm, pre-broken to 1.0mm, and put into a hydrogen treatment furnace for HDDR treatment; that is, it is uniformly treated at 1100°C for 20 hours under an argon atmosphere, and then at 650°C , under a hydrogen atmosphere with a pressure of 0.4atm for 2 hours, hydrogen absorption and disproportionation to obtain a fine disproportionation product mixture, and then reduce the hydrogen pressure to dehydrogenate the disproportionation product, and then recombine into a (NdDy)(FeCo)B alloy phase to obtain a Low...

Embodiment 2

[0012] The magnetic powder of the present embodiment is (Nd 0.8 Dy 0.2 ) 13 (Fe 0.9 co 0.1 ) 60.5 B 6.5 , its preparation method comprises the following steps, according to (Nd 1-x Dy x ) 13 (Fe 1-y co y ) 60.5 B 6.5 (at%), wherein x=0.2, y=0.1, that is, with metal neodymium 3N, boron iron 20% B), electrolytic cobalt, pure iron Dt-4 ingredients, mix evenly, place in a vacuum induction furnace, in a high-purity Melting in an argon atmosphere, casting alloy ingots with a thickness of 25mm, pre-crushing to 3.0mm, and putting them into a hydrogen treatment furnace for HDDR treatment; that is, first uniformly treating at 1150°C for 25 hours in an argon atmosphere, and then at 800 ℃, 0.6atm pressure of hydrogen atmosphere for 1 hour, hydrogen absorption and disproportionation to obtain a fine disproportionation product mixture, and then reduce the hydrogen pressure to dehydrogenate the disproportionation product, and then compound into (NdDy)(FeCo)B alloy phase, you can ...

Embodiment 3

[0014] The magnetic powder of the present embodiment is (Nd 0.6 Dy 0.4 ) 13 (Fe 0.85 co 0.15 ) 60.5 B 6.5 , its preparation method comprises the following steps, according to (Nd 1-x Dy x ) 13 (Fe 1-y co y ) 60.5 B 6.5 (at%), where x=0.4, y=0.15, that is, with metal neodymium 3N, boron iron 21.5% B, electrolytic cobalt, pure iron Yt-01 ingredients, mixed evenly, placed in a vacuum induction furnace, in high-purity argon It is melted in an atmosphere of gas, cast into alloy ingots with a thickness of 30 mm, pre-broken to 5.0 mm, and put into a hydrogen treatment furnace for HDDR treatment; that is, firstly in an argon atmosphere, 1180 ° C for 30 hours, and then at 900 ° C , under a hydrogen atmosphere with a pressure of 0.9atm for 3 hours, hydrogen absorption and disproportionation to obtain a fine disproportionation product mixture, and then reduce the hydrogen pressure to dehydrogenate the disproportionation product, and then recombine into a (NdDy)(FeCo)B alloy p...

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Abstract

This invention relates to anisotropic magnetic powder of HDDR NdFeB and its preparation method, which adds Dy and Co elements in a NdFeB matrix phase to form (Ndl-xDyx)13(Fel-yCoy)60.5B6.5, in which,x=0-0.4, y=0.05-0.15. This invention adds a microelement Dy to replace part Nd in the NdFeB square crystal structure to form a DyFeB square crystal structure of strong anisotropy and high coercive force to increase the anisotropic field of the hard magnetic phase, adds Co to replace part of Fe atoms in the NdFeB square crystal structure to increase the courier temperature Tc of the magnetic powder.

Description

technical field [0001] The invention relates to a high temperature-resistant HDDR neodymium-iron-boron anisotropic magnetic powder, and at the same time, also relates to a preparation method of the magnetic powder. Background technique [0002] HDDR (hydrogenation-disproperation-desorption-recombination) is hydrogen absorption-disproportionation-dehydrogenation-recombination. Since it was proposed by TaResnita et al. in 1989, after more than 10 years of research and improvement, it has become the main production of NdFeB magnetic powder. method. The preparation of anisotropic magnetic powder by HDDR method has the advantages of simple process, high magnetic powder performance and easy processing. As a new type of functional material, HDDR anisotropic NdFeB magnetic powder has high magnetic properties ((BH)max up to 42MGOe), easy processing and other advantages, and can be widely used in electronics, automobiles, computers, aerospace, medical equipment, instruments and meter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/00C22C1/00B22F9/00
Inventor 陈永琦
Owner LUOHE SANXIN RARE EARTH PERMANENT MAGNETIC MATERIAL
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