Sintered neodymium-iron-boron magnet and preparing method thereof

A technology of NdFeB magnets, which is applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of reduced magnetic properties of sintered NdFeB magnets, save preparation costs, solve stacking problems, reduce The effect of performance reduction

Inactive Publication Date: 2015-12-30
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
View PDF5 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Ce element will lead to a sharp de

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sintered neodymium-iron-boron magnet and preparing method thereof
  • Sintered neodymium-iron-boron magnet and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1:

[0023] co-phase CeH y It is directly obtained by hydrogen absorption and crushing of pure cerium metal and air milling, and the average powder particle size is 1.5 μm. 1wt% CeH y Incorporated (Ce 0.2 Nd 0.8 ) 31 Fe 67.7 Al 0.1 Cu 0.1 Zr 0.1 B jet mill powder, mix evenly, orientate and shape in a magnetic field to prepare a blank magnet, put it into a vacuum sintering furnace for sintering at 1020°C, 880°C+500°C two-stage tempering treatment; and sinter at 1020°C, 880°C ℃+500℃+350℃ three-stage tempering treatment to prepare sintered NdFeB magnets, the magnetic properties are shown in Table 1.

Example Embodiment

[0024] Example 2:

[0025] Complement PrNdH y It is directly obtained by hydrogen absorption and crushing of praseodymium neodymium metal and air milling, and the average powder particle size is 1.5 μm. The 2wt% PrNdH y Incorporated (Ce 0.2 Nd 0.8 ) 31 Fe 67.7 Al 0.1 Cu 0.1 Zr 0.1 B air-milled powder, mixed evenly, oriented and formed in a magnetic field to prepare a blank magnet, which was sintered in a vacuum sintering furnace at 1010 °C, 860 °C + 490 °C two-stage tempering treatment; and sintered at 1010 °C, 860 °C ℃+490℃+320℃ three-stage tempering treatment to prepare sintered NdFeB magnets, the magnetic properties are shown in Table 1.

Example Embodiment

[0026] Example 3:

[0027] co-phase CeH y It is directly obtained by hydrogen absorption and crushing of pure cerium metal and air milling, and the average powder particle size is 1.5 μm. 3wt% CeH y Incorporated (Ce 0.2 Nd 0.8 ) 31 Fe 67.7 Al 0.1 Cu 0.1 Zr 0.1 B jet mill powder, mix evenly, orientate and shape in a magnetic field to prepare a blank magnet, put it into a vacuum sintering furnace for sintering at 980°C, 850°C+480°C two-stage tempering treatment; and sinter at 1050°C, 850°C ℃+480℃+280℃ three-stage tempering treatment to prepare sintered NdFeB magnets, the magnetic properties are shown in Table 1.

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

No PUM Login to view more

Abstract

The invention discloses a sintered neodymium-iron-boron magnet and a preparing method thereof. The sintered neodymium-iron-boron magnet is prepared in the mode that Ce-enrichment main-phase alloy powder and low-melting-point TeHy auxiliary-phase powder are evenly mixed, sintered and subjected to three-section tempering. The mass-percent chemical formula of the Ce-enrichment main-phase alloy powder is (CexRe1-x)aFe100-a-b-cTMbBc. Re is one or more kinds of Pr and Nd, TM is one or more kinds of Co, Al, Cu, Ga, Nb and Zr, x ranges from 0.2 to 0.5, a ranges from 30 to 32.5, b ranges from 0.3 to 2.5, c ranges from 0.9 to 1.2, and Te is one or more kinds of La, Ce, Pr and Nd. The sintered neodymium-iron-boron magnet and the preparing method have the advantages that the performance reducing range caused by adding Ce is reduced, the utility ratio of Ce resources is increased, the preparing cost of sintered neodymium iron boron is saved, the Ce stacking problem is solved, the healthy-stable development of the rare earth industry is promoted, and important actual significance is achieved.

Description

technical field [0001] The invention relates to the related technical field of rare earth permanent magnet materials, in particular to a sintered NdFeB magnet and a preparation method thereof. Background technique [0002] NdFeB permanent magnet materials are widely used in the fields of computers, wind power generation, aerospace and equipment automation because of their excellent magnetic properties. In the preparation process of sintered NdFeB magnets, elements such as Pr, Nd, Dy and Tb need to be used in large quantities. In 2011, the drastic fluctuation of global rare earth price aroused widespread concern in the scientific and industrial circles at home and abroad. Seeking the replacement of key rare earth elements and the balanced utilization of rare earth resources has become a hot topic in current research. The most abundant element in ore resources is lanthanum and cerium, and the high-abundance Ce element has attracted the general interest of scientific research...

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
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/10
Inventor 章晓峰郝忠彬洪群峰李润锋
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