Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Gadolinium-containing Nd-Fe-B rare earth permanent magnetic material dn its manufacturing method

A rare earth permanent magnet and neodymium iron boron technology, applied in the field of magnetic materials, can solve problems such as unspecified Gd, and achieve the effect of reducing costs

Active Publication Date: 2007-11-14
BEIJING ZHONG KE SAN HUAN HI TECH
View PDF2 Cites 57 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although foreign NdFeB basic composition patents mention the addition of Gd, they do not point out the role of Gd and Gd is an essential component for improving Hcj and improving temperature resistance.

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

Embodiment 1

[0041] A kind of neodymium iron boron rare earth permanent magnet material containing gadolinium, according to the batching described in following table 1:

[0042] Table 1

[0043] existing magnet 1

Example 1

weight

%%

B

0.97

0.97

Dy

1

1

Tb

0

0

Nd

31.9

31.9

Pr

0

0

co

1

1

Cu

0.11

0.11

Gd

0

0.05

Ga

0.12

0.12

Al

0

0

Nb

0.3

0.3

Fe

64.6

64.55

[0044] Then adopt following steps to prepare NdFeB rare earth permanent magnet material:

[0045] (1) Melting-casting: the raw materials are formed into molten alloy liquid by vacuum melting method, and then the molten alloy liquid is cast and cooled into a book-shaped alloy ingot with a thickness of about ...

Embodiment 2

[0056] The smelting step adopts vacuum smelting; the thickness of the alloy ingot is about 10mm; the ingot is crushed into powder by the mechanical coarse crushing method, and the average particle size is <1mm; forming: forming by molding and cooling isostatic pressing; sintering: the blank after forming Carry out sintering at 1085° C. for 1 hour in a vacuum sintering furnace; finally temper at 500° C. for 1 hour, and the rest of the steps are the same as in Example 1 to obtain NdFeB rare earth permanent magnet materials. See Table 3 for the results.

[0057] table 3

[0058] existing magnet 2

[0059] By comparison, it can be found that the Hcj of the magnet of Example 2 added with Gd is 1.03 kOe higher than that of the existing magnet 2 without Gd added.

Embodiment 3

[0061] The smelting process adopts vacuum smelting, and the alloy ingot with a thickness of about 0.2mm is used; the solution heat treatment process (1095°C) is used between the casting and crushing processes; the ingot is crushed into powder by hydrogen crushing method, and the average particle size is <1mm; : Formed by rubber molding; the temperature of the vacuum sintering furnace is 1085° C., the tempering temperature is 600° C., and the rest of the steps are the same as in Example 1 to obtain the NdFeB rare earth permanent magnet material. The results are shown in Table 4.

[0062] Table 4

[0063] Existing magnet 3

[0064] By comparison, it can be found that the Hcj of the magnet of Example 3 added with Gd is 0.98 kOe higher than that of the existing magnet 3 without Gd added.

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
Thicknessaaaaaaaaaa
Login to View More

Abstract

The present invention provides the Nd-Fe-B gadolinium-containing rare earth permanent magnet materials and manufacturing methods. Nd-Fe-B described in the gadolinium-containing rare earth permanent magnet material for the composition: Re alpha Gd beta B gamma MxNyFe100 - alpha-beta - gamma - xy, including: Re for REE, including from Nd, Pr, Dy, Tb and in at least one Ce elemental or more elements; M to add elements, including Co and Cu; N to add elements, including from Al, Ga, Nb, Zr, Ti and Sn one or more elements; alpha, beta, gamma , x, y percentage of weight for each element content; Fe Fe and unavoidable impurities of which, 29 =< alpha =< 35,0.05 =< beta =< 0.50,0.95 =< gamma =< 1.20,0 =< x =< 10,0 =< y =< 1.50. Manufacturing methods described by melting, casting, grinding, molding and sintering of a continuous process manufacturing sintered magnets. The Nd-Fe-B Gd rare earth permanent magnet material added after its Hcj has improved, and to improve its temperature .

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular, the invention relates to a NdFeB rare earth permanent magnet material added with gadolinium and a manufacturing method thereof. Background technique [0002] Rare earth NdFeB permanent magnet material is the third generation permanent magnet material developed in the early 1980s. It is commonly known as the "Permanent Magnet King" because of its extremely strong magnetism. It can pick up objects equivalent to 1000 times its own weight, and has excellent magnetic characteristics and energy-saving, material-saving, and environmental protection effects. It is a high-performance material that other permanent magnet materials cannot match. As an important functional material, rare earth permanent magnet materials have been widely used in the fields of energy, transportation, machinery, medical treatment, computers, and home appliances, and have penetrated into all aspects of ...

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): H01F1/057H01F1/08
Inventor 赵玉刚张瑾侯德柱成问好胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com