A heavy rare earth-free sintered NdFeB

A technology without heavy rare earths and NdFeB, applied in inductor/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc. The effect of performance improvement

Inactive Publication Date: 2018-12-11
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the abundance of heavy rare earth elements in the earth's crust is very low and the proven reserves are very limited. Judging from the current mining situation of rare earth elements, heavy rare earth elements have gradually tended to be exhausted, and the Chinese government has also begun to consciously control the export quota of rare earth elements , leading to a sharp increase in the price of heavy rare earths, which greatly increased the economic burden on enterprises

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The preparation method of the heavy rare earth sintered NdFeB comprises the following steps:

[0039] 1) The preparation of the main phase alloy: it is made by flake flakes in the quick-setting furnace, hydrogen crushing treatment and jet milling in sequence; the average particle size of the main phase alloy is 2-5 μm.

[0040] 2) Preparation of auxiliary phase alloy: put Nd and Fe in a quartz tube according to the ratio and heat and melt to obtain a molten solution. The melting temperature is 1300-1450°C, and the pressure of the argon atmosphere is 20kPa-30kPa; The small hole at the bottom of the crucible is sprayed onto the surface of the high-speed rotating water-cooled molybdenum roller to form a quenched belt; then the quenched belt is placed in a high-energy ball mill to prepare particles with an average particle size of 0.5-1.5 μm to obtain a supplementary phase alloy.

[0041] 3) Mixing: mix the main phase alloy and the auxiliary phase alloy in proportion;

[0...

Embodiment 1

[0046] 1) Main phase alloy (Pr 0.25 Nd 0.75 ) 27 Fe 69.38 Nb 0.1 co 1.5 Cu 0.15 Al 0.7 Ga 0.2 B 0.97 Preparation: It is made by flake flakes in a quick-setting furnace, hydrogen crushing treatment, and jet milling; the average particle size of the main phase alloy is 3.2 μm.

[0047] 2) Supplementary phase alloy Nd 0.55 Fe 0.45 Preparation: put Nd and Fe in a quartz tube according to the ratio and heat and melt to obtain a molten solution. The melting temperature is 1350°C and the pressure of the argon atmosphere is 25kPa; relying on Ar gas to push the alloy melt through the small hole at the bottom of the crucible to a high-speed rotating The surface of the molybdenum roller is water-cooled to form a quenching zone; then the quenching zone is placed in a high-energy ball mill to prepare particles with an average particle size of 0.9 μm to obtain a supplementary phase alloy.

[0048] 3) Mixing: mix the main phase alloy and auxiliary phase alloy in a ratio of 100:1; ...

Embodiment 2

[0053] 1) Main phase alloy (Pr 0.25 Nd 0.75 ) 27 Fe 69.38 Nb 0.1 co 1.5 Cu 0.15 Al 0.7 Ga 0.2 B 0.97 Preparation: It is made by flake flakes in a quick-setting furnace, hydrogen crushing treatment, and jet milling; the average particle size of the main phase alloy is 3.1 μm.

[0054] 2) Supplementary phase alloy Nd 0.6 Fe 0.4 Preparation: put Nd and Fe in a quartz tube according to the ratio and heat and melt to obtain a molten solution. The melting temperature is 1400°C and the pressure of the argon atmosphere is 28kPa; relying on Ar gas to push the molten alloy through the small hole at the bottom of the crucible and spray it into the high-speed rotating The surface of the molybdenum roller is water-cooled to form a quenching zone; then the quenching zone is placed in a high-energy ball mill to prepare particles with an average particle size of 0.9 μm to obtain a supplementary phase alloy.

[0055] 3) Mixing: mix the main phase alloy and the auxiliary phase alloy ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to the field of permanent magnetic materials and discloses a heavy rare earth-free sintered NdFeB. The raw material comprisesa main phase alloy and an auxiliary phase alloy. Themass composition of the elements in that main phase alloy is PraNdbTMcFe100-a-b-c-dBd, wherein TM is one or more of Nb, Al, Cu, Co, Ni, Ga, Zr; 27 <= a, b <= 32, 0 <= c <= 10, 0.7 <= d <= 1. 1, the rest is Fe and inevitable impurities; The mass composition of the elements in the auxiliary phase alloy is NdmFen alloy, m+n=1; The mass of the auxiliary phase alloy is 0.5%-4wt% of that of the main phase alloy. The invention can make the performance of the Nd-Fe-B magnet reach the magnetic performance which can be achieved by adding 1-3wt% of dysprosium into the Nd-Fe-B magnet prepared by the traditional process without using the heavy rare earth.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a heavy rare earth sintered NdFeB. Background technique [0002] Compared with other permanent magnet materials, sintered NdFeB permanent magnet materials have relatively high intrinsic coercive force and magnetic energy product, so they are widely used in electronic circuits, metal instruments, aerospace, medical machinery and other fields. The common ones are permanent magnet motors, speakers, computer disk drives, magnetic resonance imaging equipment instruments, etc. At the same time, high-performance NdFeB permanent magnet materials are widely used in modern industry and electronic technology, so that instruments and equipment tend to be miniaturized, thinned and energy-saving. [0003] Rare earth permanent magnets have been developing in the direction of high performance with high remanence and high coercive force. In order to improve the overall performance of Nd...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0253H01F41/0266
Inventor 洪群峰韩相华孙永阳郝忠彬
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap