High-corrosion-resistance permanent magnet rich in high-abundance rare earth and preparation method of high-corrosion-resistance permanent magnet rich in high-abundance rare earth

A rare earth permanent magnet, high abundance technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high melting point, poor grain boundary bonding, etc., to achieve a simple process, increase the proportion, The effect of reducing material cost

Active Publication Date: 2019-06-07
NANJING UNIV OF SCI & TECH
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the particle size of Cu powder is much smaller than the grain size of the main phase, it can be well wrapped around the main phase, greatly increasing the electrode potential of the grain boundary phase of the magnet, and improving the corrosion 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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-corrosion-resistance permanent magnet rich in high-abundance rare earth and preparation method of high-corrosion-resistance permanent magnet rich in high-abundance rare earth
  • High-corrosion-resistance permanent magnet rich in high-abundance rare earth and preparation method of high-corrosion-resistance permanent magnet rich in high-abundance rare earth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The main phase alloy is divided into nominal composition (La 0.2 Ce 0.3 PR 0.1 Nd 0.4 ) 31 Fe 67 Z 1.0 B 1.0 The wt.% ratio is weighed, and the alloy powder is prepared by induction melting, quick-setting casting, hydrogen explosion and jet milling. The average particle size of the powder is about 3.5 μm, where Z is Al=0.2, Co=0.3, Cu= 0.4, Ga=0.1;

[0038] The auxiliary alloy is divided into nominal composition (Ce 0.8 PR 0.1 Nd 0.1 ) 56 Fe 44 wt.% proportioning and weighing, induction melting, alloy 800°C vacuum homogenization heat treatment for 10 hours, mechanical crushing, jet milling powder, the average particle size of the powder is about 1.0 μm;

[0039] The obtained main phase alloy powder and auxiliary alloy powder are placed in a mixer in a protective atmosphere (nitrogen or argon) according to a certain ratio, and 0.05% of antioxidant is added at the same time, and uniformly mixed for 0.5-1.0h. Wherein, the mass percent of MM-Fe auxiliary alloy ...

Embodiment 2

[0048] The main phase alloy is weighed according to the nominal composition (La0.1Ce0.4Pr0.1Nd0.4)28.5Fe69.5N1.0B1.0wt.%, prepared by induction melting, quick-setting casting, hydrogen explosion and jet milling Alloy powder, the average particle size of the powder is about 3.5μm, where N is Al=0.2, Cu=0.5, Zr=0.1, Nb=0.1, Ga=0.1;

[0049] The auxiliary alloy is weighed according to the nominal composition of Ce56Fe44wt.%, and the alloy is subjected to induction melting, vacuum homogenization heat treatment at 800 °C for 10 hours, mechanical crushing, high-energy ball milling, and the average particle size of the powder is about 0.8 μm;

[0050] The obtained main phase alloy powder and auxiliary alloy powder are placed in a mixer in a protective atmosphere (nitrogen or argon) according to a certain ratio, and 0.05% of antioxidant is added at the same time, and uniformly mixed for 0.5-1.0h. Wherein, the mass percent of Ce-Fe auxiliary alloy powder is 5%;

[0051] The uniformly ...

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
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of permanent magnet materials, and particularly relates to a high-corrosion-resistance permanent magnet rich in high-abundance rare earth and a preparationmethod of the high-corrosion-resistance permanent magnet rich in the high-abundance rare earth. The high-corrosion-resistance permanent magnet rich in the high-abundance rare earth comprises a strongmagnetic phase and a crystal boundary rare-earth-rich phase, wherein the strong magnetic phase e is an MM-Fe-B phase, and the crystal boundary rare-earth-rich phase is an MM-Fe phase. According to the method for preparing the permanent magnet, through a double-alloy process, an MM-Fe-B main phase alloy and an MM-Fe auxiliary alloy are prepared, smelted and crushed to prepare powder; the preparedMM-Fe auxiliary alloy powder is added into the main alloy to be evenly mixed according to the mass percent of 1% to 5%; and orientation pressing, sintering and heat treatment are conducted, and the finally sintered magnet is obtained. MM-Fe is introduced in a crystal boundary, thus distribution of the crystal boundary rare-earth-rich phase can be optimized, the crystal boundary rare-earth-rich phase partially replaces an original crystal boundary phase prone to corrosion, the intrinsic corrosion resistance of the MM-Fe-B magnet is improved, through the method, the proportion of low-cost rare earth La/Ce in the magnet is further increased, the material cost is lowered, the technological process is simple, and the high-corrosion-resistance permanent magnet rich in high-abundance rare earth is suitable for scale production.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, in particular to a high-corrosion-rich and high-abundance rare earth permanent magnet and a preparation method thereof. Background technique [0002] Neodymium iron boron (Nd-Fe-B) permanent magnet material is currently the most magnetic and widely used magnetic functional material. After more than 30 years of development since its discovery in 1984, Nd-Fe-B permanent magnets are widely used in hybrid vehicles and Wind turbines, etc., have become indispensable important functional materials for high-tech industries. At the same time, Nd-Fe-B permanent magnets are also the materials that consume the most rare earths, and the annual consumption of rare earths is close to half of the total amount of rare earths used in my country. In recent years, the downstream industry's demand for Nd-Fe-B permanent magnets has grown by leaps and bounds. Nd-Fe-B magnets are highly dependent on...

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): H01F1/057H01F41/02
Inventor 张玉晶姚旻皓徐锋缪雪飞
Owner NANJING UNIV OF SCI & TECH
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