Method for manufacturing La-contained high-performance neodymium iron boron rare earth permanent magnet

A rare earth permanent magnet and manufacturing method technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of shortage of rare earths, rising prices of rare earths, shortage of heavy rare earth elements, etc.

Active Publication Date: 2014-08-20
SHENYANG GENERAL MAGNETIC
View PDF10 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the wide application of NdFeB rare earth permanent magnets, rare earths are becoming more and more scarce, especially heavy rare earth elements are obviously becoming scarce, and the price of rare earths has risen again and again; for this reason, people have carried out many explorations, and double alloys have appeared. technology, metal infiltration technology, improvement or reorganization of grain boundary phase technology, etc.; patent CN101521069B discloses the technology of doping heavy rare earth hydride nanoparticles to prepare NdFeB. powder, and then mix the heavy rare earth hydride nanoparticles produced by physical vapor deposition technology with the aforementioned powder, and then manufacture NdFeB magnets through conventional processes such as magnetic field molding and sintering, although the patent finds ways to improve the coercive force of magnets method, mass production has problems

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
  • Method for manufacturing La-contained high-performance neodymium iron boron rare earth permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Select La-LR-Fe-B-Ma alloy and La-HR-Fe-B-Mb alloy 600Kg smelting respectively according to Table 1 Example 1 composition, and in the molten state, the alloy is cast onto a water-cooled rotating copper roll for cooling Alloy flakes are formed. During the smelting process, the cooling rate of La-LR-Fe-B-Ma alloy and La-HR-Fe-B-Mb alloy is adjusted by adjusting the rotating speed of the rotating copper roller to obtain La-LR-Fe-B- The average grain size of Ma alloy is 2.8 μm; the average grain size of La-HR-Fe-B-Mb alloy is 1.8 μm; La-LR-Fe-B-Ma alloy and La -HR-Fe-B-Mb alloy flakes are subjected to hydrogen crushing, and the alloy flakes after hydrogen crushing and the metal oxides listed in Table 1 are put into the mixer according to the ratio of Table 1, and mixed under nitrogen protection. The time is 60 minutes. After the mixing, airflow milling is carried out. The powder collected by the cyclone collector and the ultrafine powder collected by the filter are put into...

Embodiment 2

[0066] Select La-LR-Fe-B-Ma alloy and La-HR-Fe-B-Mb alloy 600Kg smelting respectively by the composition in the embodiment 2 of table 1, alloy is poured to the rotating copper roll of band water cooling under molten state The upper cooling forms alloy flakes. During the smelting process, the cooling rate of La-LR-Fe-B-Ma alloy and La-HR-Fe-B-Mb alloy is adjusted by adjusting the rotation speed of the rotating copper roller to obtain La-LR-Fe- The average grain size of the B-Ma alloy is 2.3 μm; the average grain size of the La-HR-Fe-B-Mb alloy is 1.3 μm; the La-LR-Fe-B-Ma alloy is selected according to the ratio listed in Table 1 Carry out hydrogen crushing with La-HR-Fe-B-Mb alloy sheet, the alloy sheet after hydrogen crushing and the metal oxide listed in Table 1 are put into the mixer together by the ratio of Table 1, and mix under nitrogen protection, The mixing time is 40 minutes. After the mixing, airflow milling is carried out. The powder collected by the cyclone collect...

Embodiment 3

[0072] Select La-LR-Fe-B-Ma alloy and La-HR-Fe-B-Mb alloy 600Kg smelting respectively by the composition in the embodiment 3 of table 1, alloy is poured to the rotary copper roll of band water cooling under molten state The upper cooling forms alloy flakes. During the smelting process, the cooling rate of La-LR-Fe-B-Ma alloy and La-HR-Fe-B-Mb alloy is adjusted by adjusting the rotation speed of the rotating copper roller to obtain La-LR-Fe- The average grain size of B-Ma alloy is 2.8-3.2μm; the average grain size of La-HR-Fe-B-Mb alloy is 2.1-2.4μm; select La-LR-Fe- The B-Ma alloy and La-HR-Fe-B-Mb alloy flakes are subjected to hydrogen crushing, and the alloy flakes after hydrogen crushing are put into the mixer together with the metal oxides listed in Table 1 according to the ratio of Table 1, and are protected under nitrogen protection. Down-mixing, the mixing time is 90 minutes, airflow milling is carried out after mixing, the powder collected by the cyclone collector and ...

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 discloses a method for manufacturing a La-contained high-performance neodymium iron boron rare earth permanent magnet. Raw materials are formed by La-LR-Fe-B-Ma alloy, La-HR-Fe-B-Mb alloy and metallic oxide micro powder, wherein the LR represents two or more rare earth elements which do not include La but include Nd and Pr, the HR represents one or more rare earth elements which do not include La but include Dy or Tb, the Ma represents one or more of Al, Co, Nb, Ga, Zr and Cu, and the Mb represents one or more of Al, Co, Nb, Ga, Zr, Cu and Mo. The manufacturing method includes the working procedures of La-LR-Fe-B-Ma alloy smelting, La-HR-Fe-B-Mb alloy smelting, alloy hydrogen decrepitation, metallic oxide micro powder surface adsorbing and making, magnetic field forming, sintering and aging, and the neodymium iron boron rare earth permanent magnet is manufactured.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnets, in particular to a La-containing high-performance NdFeB rare earth permanent magnet and a manufacturing method. Background technique [0002] NdFeB rare earth permanent magnets are used more and more for their excellent magnetic properties, and are widely used in medical nuclear magnetic resonance imaging, computer hard drives, audio, mobile phones, etc.; with the requirements of energy saving and low-carbon economy, NdFeB rare earth permanent magnets have begun to be used in auto parts, household appliances, energy-saving and control motors, hybrid vehicles, wind power generation and other fields. [0003] In 1983, Japanese patents 1,622,492 and 2,137,496 first disclosed the NdFeB rare earth permanent magnet invented by Sumitomo Metal, announced the characteristics, composition and manufacturing method of NdFeB rare earth permanent magnet, and confirmed that the main phase is Nd 2 Fe...

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): H01F41/02H01F1/057
Inventor 孙宝玉
Owner SHENYANG GENERAL MAGNETIC
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