Sintered neodymium iron boron permanent magnet based on crystal grain recombination and manufacturing method

A manufacturing method and permanent magnet technology, which is applied in the manufacture of inductors/transformers/magnets, permanent magnets, magnetic materials, etc., can solve the problems of easy oxidation of the base material, affecting product yield and particle size distribution, and affecting the particle size of powder making, etc.

Active Publication Date: 2014-12-24
SHENYANG GENERAL MAGNETIC
View PDF11 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] U.S. Patent No. 7,258,751 authorized on August 21, 2007 and U.S. Patent No. 7,867,343 authorized on January 11, 2011 disclose heat treatment of quick-setting alloy sheets at 400-800°C for 5 minutes to 12 hours. Make the RH element move from the grain boundary phase to the main phase, thereby increasing the coercive force of the rare earth magnet; US Patent No. 7,585,378 authorized on October 8, 2009 discloses a method for manufacturing an alloy for R-T-Q series rare earth magnets. It consists in rapidly cooling the alloy melt to a range of 700-1000°C to form a quick-setting alloy, and then keeping the quick-setting alloy at a temperature of 700-900°C for 15-60

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 permanent magnet based on crystal grain recombination and manufacturing method
  • Sintered neodymium iron boron permanent magnet based on crystal grain recombination and manufacturing method
  • Sintered neodymium iron boron permanent magnet based on crystal grain recombination and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Raw materials containing Pr and Nd are batched according to serial numbers 1-9, and then the raw materials are loaded into vacuum melting and quick-setting equipment to prepare vacuum quick-setting alloy flakes as the first alloy; the average grain size of the alloy flakes of the first alloy is greater than 1.6 μm , less than 3.9 μm; then the raw materials containing Pr, Nd, and Dy components are batched according to the serial numbers 1-9, and then the raw materials are loaded into the vacuum quick-setting alloy sheet prepared by the vacuum melting quick-setting equipment as the second alloy; the second alloy The average grain size of the alloy sheet is greater than 1.1 μm and less than 2.9 μm; the first and second alloy smelting are both carried out in a vacuum Mn removal process, and the Mn removal process controls the heating temperature in the range of 400-1500 ° C and controls the vacuum degree to 5×10 3 Pa to 5×10 -2 Pa range, holding time 10-240 minutes; then c...

Embodiment 2

[0054] The raw materials containing Pr and Nd are batched according to the serial numbers 1-9, and then the raw materials are loaded into the double-roller cooled vacuum melting quick-setting equipment to prepare double-sided cooled quick-setting alloy flakes as the first alloy; the alloy flakes of the first alloy The average grain size is greater than 2.6 μm and less than 3.0 μm; then the raw materials containing Pr, Nd, and Dy are batched according to the serial numbers 1-9, and then the raw materials are loaded into the double-roller cooling vacuum melting and quick-setting equipment to prepare double-sided cooling Quick-setting alloy flakes are used as the second alloy; the average grain size of the alloy flakes of the second alloy is greater than 2.5 μm and less than 2.9 μm; the first and second alloy smelting are all carried out in a vacuum de-Mn process, and the de-Mn process controls the heating temperature 400-1450°C range, control vacuum 5×10 3 Pa to 5×10 -1 Pa ran...

Embodiment 3

[0058] The raw materials containing Pr and Nd are batched according to the serial numbers 1-9, and then the raw materials are loaded into the double-roller cooled vacuum melting quick-setting equipment to prepare double-sided cooled quick-setting alloy flakes as the first alloy; the alloy flakes of the first alloy The average grain size is greater than 2.6 μm and less than 3.0 μm; then the raw materials containing Pr, Nd, and Dy are batched according to the serial numbers 1-9, and then the raw materials are loaded into the double-roller cooling vacuum melting and quick-setting equipment to prepare double-sided cooling Quick-setting alloy flakes are used as the second alloy; the average grain size of the alloy flakes of the second alloy is greater than 1.1 μm and less than 1.5 μm; the first and second alloy smelting are all carried out in a vacuum de-Mn process, and the de-Mn process controls the heating temperature 500-1400℃ range, control vacuum degree 5×10 1 Pa to 5×10 -1 P...

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
Average grain sizeaaaaaaaaaa
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a sintered neodymium iron boron permanent magnet based on crystal grain recombination and a manufacturing method. The permanent magnet has composite main phases that main phases with high heavy rare earth RH content are distributed around main phases with lower heavy rare earth RH content, and no continuous grain boundary phase exists in the composite main phases; average content of heavy rare earth RH on the periphery of the composite main phases is higher than content of heavy rare earth RH in the core part of the composite main phase, and the average crystal grain size of the composite main phases is 6-14mu m; heavy rare earth RH comprises more than one of Dy, Tb, Ho, Gd and Y elements. The manufacturing method comprises steps of first alloy smelting, second alloy smelting, hydrogen decrepitation, alloy plate mixing, jet mill powdering, magnetic field formation, vacuum sintering and aging; the step of first alloy smelting comprises a process of preparing first alloy plates containing Pr and Nd elements; the step of second alloy smelting comprises a process of preparing second alloy plates containing heavy rare earth RH elements.

Description

technical field [0001] The invention belongs to the field of permanent magnet devices, in particular to a sintered NdFeB permanent magnet based on grain recombination and a manufacturing method thereof. Background technique [0002] Corrosion-resistant high-performance permanent magnet is a basic electronic component and electrical component widely used in the world today, mainly used in computers, mobile phones, televisions, automobiles, communications, toys, audio, automation equipment, nuclear magnetic resonance imaging, etc. With the requirements of energy saving and low-carbon economy, high-performance permanent magnets have begun to be applied in energy-saving household appliances, hybrid electric vehicles, wind power generation and other fields. [0003] U.S. Patent No. 7,258,751 authorized on August 21, 2007 and U.S. Patent No. 7,867,343 authorized on January 11, 2011 disclose heat treatment of quick-setting alloy sheets at 400-800°C for 5 minutes to 12 hours. Make ...

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): H01F1/057H01F7/02H01F41/02B22D11/06
Inventor 孙宝玉洪光伟王健杨永泽段永利
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