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

Method for preparing corrosion resistance rare earth permanent-magnetic material

A rare-earth permanent magnet and corrosion-resistant technology, which is applied in the fields of magnetic materials, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve the problems of corrosion resistance constraints, easy corrosion, and limited improvement space, and achieve improved corrosion resistance , reduced weight loss, superior corrosion resistance

Inactive Publication Date: 2007-08-29
NANJING UNIV OF SCI & TECH
View PDF2 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method of changing performance through material compounding can improve the corrosion resistance of the material, the root cause of the corrosion resistance of rare earth permanent magnet materials is that the rare earth-rich intermetallic compound acts as a grain boundary phase, and this technical method does not change the grain boundary. The main composition of the phase, the corrosion resistance of the material is still restricted by the grain boundary phase, the improvement space is limited, and the problem of the corrosion resistance of the material is not fundamentally solved

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 preparing corrosion resistance rare earth permanent-magnetic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Prepare the main and auxiliary alloy ingots respectively, the atomic percentage composition of the main alloy is Nd: 9.5%, Dy: 1.5%,

[0017] Fe: 81.5%, B: 5.5%, Al: 2%, the atomic percentage composition of the auxiliary alloy is Nd: 59.9%, Co:

[0018] 29.9%, Al: 9.9%, Dy: 0.1%, Fe: 0.1%, Cu: 0.1%.

[0019] 2) The main and auxiliary alloys are powdered separately, and the average particle diameter is made by primary and secondary fine crushing under the protection of nitrogen atmosphere.

[0020] It is about 6.5μm powder.

[0021] 3) The main and auxiliary alloy powders are mixed according to the weight ratio of 9:1, and at the same time, 3% of the total weight of the alloy is added.

[0022] Ethylene oxide alkyl ether and 1% gasoline are uniformly mixed into a mixed powder in a mixer.

[0023] 4) The mixed powder is first pressed under a pressure of 8MPa and an orientation magnetic field of 1.7T by a magnetic field orientation forming press

[0024] Forming, an...

Embodiment 2

[0030] 1) Prepare the main and auxiliary alloy ingots respectively. The atomic percentage composition of the main alloy is Nd: 9%, Dy: 1%, Pr: 1%, Tb: 1%, Fe: 78%, Co: 4%, B: 6%, the atomic percentage composition of the auxiliary alloy is Nd: 30%, Pr: 10%, Dy: 10%, Co: 29.9%, Fe: 0.1%, Al: 10%, Cu: 5%, Ga: 5%.

[0031] 2) Powder the main and auxiliary alloys separately. Through primary and secondary fine crushing under the protection of nitrogen atmosphere, powder with an average particle diameter of about 6.5 μm is produced.

[0032] 3) The main and auxiliary alloy powders are mixed according to the weight ratio of 9:1, and the antioxidant polyethylene oxide alkyl ether accounting for 3% of the total weight of the alloy powder and the gasoline accounting for 1% of the total weight of the alloy powder are added at the same time. Mix evenly into a mixed powder.

[0033] 4) The mixed powder is first pressed and formed by a magnetic field orientation forming press under a press...

Embodiment 3

[0037] 1) Prepare the main and auxiliary alloy ingots respectively. The atomic percentage composition of the main alloy is Nd: 7%, Dy: 3%, Tb: 2%, Fe: 78%, Co: 4%, B: 6%, and the auxiliary alloy The atomic percent composition is Nd: 40%, Pr: 15%, Fe: 5%, Co: 25%, Al: 10%, Cu: 2%, Ga: 2%, Nb: 1%.

[0038] 2) Powder the main and auxiliary alloys separately. Through primary and secondary fine crushing under the protection of nitrogen atmosphere, powder with an average particle diameter of about 5.5 μm is produced.

[0039] 3) The main and auxiliary alloy powders are mixed according to the weight ratio of 88:12, and the antioxidant polyethylene oxide alkyl ether accounting for 3% of the total weight of the alloy powder and the gasoline accounting for 1% of the total weight of the alloy powder are added at the same time. Mix evenly into a mixed powder.

[0040] 4) The mixed powder is first pressed and formed by a magnetic field orientation forming press under a pressure of 8 MPa ...

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

This invention discloses a preparation method for anti-corrosion rare earth magnet material characterizing that it takes the optimized grain-boundary phase design as the starting point on the basis of a dual alloy method to select Nd base alloy with high crystal forming ability as the assist alloy and reduces the temperature of the press mold blank in a quartz container to room temperature from over grain-boundary phase melting point with the water extraction way to get enough cooling rate and guarantee the non-grain-boundary phase, compared with the material of the same composition prepared by ordinary method, the weightlessness of this invented material reduces over 30% after testing the weightlessness of the material by laying it for 96 hours under 121deg.C, 2 atmosphere and 100% humid environment to show the advanced performance of anti-corrosion.

Description

a technical field [0001] The invention relates to a preparation method of a magnetic material, in particular to a preparation method of a corrosion-resistant rare earth permanent magnet material. Two background technology [0002] At present, sintered NdFeB rare earth permanent magnet materials prepared by powder metallurgy technology have been widely used in many fields such as electronics, automobiles, computers, electric power, machinery, energy, environmental protection, national defense, and medical equipment due to their excellent magnetic properties. The sintered NdFeB rare earth permanent magnet material is mainly composed of a matrix phase and a rare earth-rich phase. Among them, the atomic ratio of the matrix phase is close to Nd:Fe:B=2:14:1, which constitutes the main phase of the microstructure, while the rare earth-rich phase, also known as the grain boundary phase, is distributed along the grain boundary and plays an exchange coupling role. It is beneficial to...

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): H01F41/02H01F1/057H01F1/08C22C1/04C21D1/00C21D11/00
Inventor 徐锋陈光杜宇雷皋萍
Owner NANJING UNIV OF SCI & 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