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

A rare earth magnet containing ho and w

A technology of rare earth magnets and rare earth elements, applied in the field of magnet manufacturing, can solve problems such as abnormal grain growth, achieve high industrial value, high economic effect, and reduce AGG

Active Publication Date: 2018-08-31
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, for rare-earth magnets whose sintering performance has been greatly improved, abnormal grain growth (AGG) is extremely prone to occur if only a small amount of impurities in the crystal grain boundaries are used to suppress abnormal grain growth.

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
  • A rare earth magnet containing ho and w
  • A rare earth magnet containing ho and w
  • A rare earth magnet containing ho and w

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In the raw material preparation process: prepare Nd with a purity of 99.5%, Ho with a purity of 99.9%, Fe-B for industrial use, pure Fe for industrial use, Cu and Al with a purity of 99.5% and W with a purity of 99.99%, and prepare them in wt%.

[0048] The contents of each element are shown in Table 2:

[0049] Table 2 The ratio of each element

[0050]

[0051] Each serial number group was prepared according to the element composition in Table 2, and 10Kg of raw materials were weighed and prepared respectively.

[0052] Melting process: Take 1 part of the prepared raw material each time and put it into a crucible made of alumina, and put it in a vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0053] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 55,000 Pa, and then casting is carried out by single-roll quenching method, ...

Embodiment 2

[0072] In the raw material preparation process: prepare Nd with a purity of 99.5%, Ho with a purity of 99.9%, Fe-B for industrial use, pure Fe for industrial use, and W with a purity of 99.99%, and prepare them by weight percentage.

[0073] The contents of each element are shown in Table 4:

[0074] Table 4 The ratio of each element

[0075]

[0076] Each serial number group was prepared according to the element composition in Table 4, and 10Kg of raw materials were weighed and prepared respectively.

[0077] Melting process: Take 1 part of the prepared raw material each time and put it into a crucible made of alumina, and put it in a vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0078] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 48,000 Pa, and then casting is carried out by single-roll quenching method, with 10 2 ℃ / sec~10...

Embodiment 3

[0096] In the raw material preparation process: prepare Nd with a purity of 99.5%, Ho with a purity of 99.9%, Fe-B for industrial use, pure Fe for industrial use, W with a purity of 99.99%, and Zr, Ga, Nb, Mn, Si, Cr, Cu, Mo are formulated in weight percent.

[0097] The contents of each element are shown in Table 6:

[0098] Table 6 The ratio of each element

[0099]

[0100] Each serial number group was prepared according to the element composition in Table 6, and 10Kg of raw materials were weighed and prepared respectively.

[0101] Melting process: Take 1 part of the prepared raw material each time and put it into a crucible made of alumina, and put it in a vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0102] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 45,000 Pa, and then casting is carried out by single-roll quenching ...

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 rare earth magnet containing Ho and W. The rare earth magnet contains an R2Fe14B type main phase and includes the following raw material composition: R: 28wt% to 33wt%, and R is a rare earth element including Nd and Ho, wherein , the content of Ho is 0.3wt% ~ 5wt%, B: 0.8wt% ~ 1.3wt%, W: 0.0005wt% ~ 0.03wt%, and the balance is T and unavoidable impurities, said T is mainly composed of Fe and / or elements of Co. In the rare earth magnet, a small amount of W suppresses the grain growth of the Ho-containing magnet during sintering, thereby preventing AGG of the Ho-containing magnet, and obtaining a magnet with high coercive force and high heat resistance.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to a rare earth magnet containing Ho and W. Background technique [0002] Sintered Nd-Fe-B magnets have superior magnetic properties and are widely used in wind power generation, nuclear magnetic resonance, automobile industry, computers, aerospace, household appliances, etc. Nd is consumed too much. However, Ho exists in a large amount and is a low-cost material that can be obtained in industrial production. Selecting Ho to partially replace metal Nd in the magnet is of great significance for reducing the actual production cost of rare earth magnets and realizing the comprehensive utilization of rare earth resources. [0003] Li Feng et al. described in "The Effect of Adding Gd or Ho on the Structure and Properties of Sintered Nd-Fe-B Magnets" (Powder Metallurgy Industry, Volume 21, Issue 5, October 2011), adding Ho can significantly improve the The temperature stabili...

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 Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/10
Inventor 永田浩张建洪
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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