Microwave Aging Treatment Method for SmCo-Based Rare Earth Permanent Magnets

A rare earth permanent magnet and aging treatment technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of discontinuous cell wall phase, cell structure damage, coercive force reduction, etc., and achieve the effect of uniform cell structure

Active Publication Date: 2016-08-31
CENT SOUTH UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by adjusting the alloy composition (Sm, Fe, Cu, Zr) to refine the Sm 2 co 17 The grain size of the R phase is often accompanied by the destruction of the cellular structure and leads to a significant reduction in magnetic properties
For example, Matthias et al. increased the content of Sm from 10.3% to 11.6%, and the Sm of the alloy 2 co 17 The size of the R phase is refined from 160nm to 60nm, but the uniformity of the cell structure becomes poor, and the cell wall phase is discontinuous, which will inevitably lead to a decrease in magnetic properties
On the other hand, the cellular structure can also be refined by shortening the aging time, but the existing short-term aging will lead to incomplete cellular structure and greatly reduce the coercive force

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
  • Microwave Aging Treatment Method for SmCo-Based Rare Earth Permanent Magnets
  • Microwave Aging Treatment Method for SmCo-Based Rare Earth Permanent Magnets
  • Microwave Aging Treatment Method for SmCo-Based Rare Earth Permanent Magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of sintered billet of samarium cobalt rare earth permanent magnet material: put the raw materials weighed in advance according to the stoichiometric ratio into an intermediate frequency induction furnace for smelting, wherein the mass fraction of Sm is 24.0%, Fe is 18.0%, and Co is 52.5% %, Zr is 1.5%, and Cu is 4%. The smelted alloy ingot is coarsely crushed and ball milled to produce alloy powder with an average particle size of 3-5 μm. The powder is oriented in a 1.5T magnetic field, and formed by vertical magnetic steel molding. The rough blank after forming is subjected to isostatic pressing, and the pressure is 300MPa. The compact was pre-fired in vacuum at 1190°C for 30 minutes, then passed through high-purity argon and heated to a sintering temperature of 1225°C and kept for 2 hours. The sintered samples were solution treated at 1190°C for 2 hours, and then air-cooled out of the furnace.

[0035] (2) Put the solution-treated sample into the in...

Embodiment 2

[0039] (1) Preparation of sintered billet of samarium-cobalt rare earth permanent magnet material: Put the raw materials weighed in advance according to the stoichiometric ratio into an intermediate frequency induction furnace for smelting, wherein the mass fraction of Sm is 26.0%, Fe is 8.0%, and Co is 50.5% %, Zr is 3.5%, and Cu is 12.0%. The smelted alloy ingot is coarsely crushed and ball milled to produce alloy powder with an average particle size of 3-5 μm. The powder is oriented in a 1.5T magnetic field, and formed by vertical magnetic steel molding. The rough blank after forming is subjected to isostatic pressing, and the pressure is 200MPa. The compact was pre-fired in vacuum at 1180°C for 30 minutes, then passed through high-purity argon and heated to the sintering temperature of 1201°C and kept for 2 hours. The sintered samples were solution treated at 1180°C for 2 hours, and then air-cooled out of the furnace.

[0040] (2) Put the solution-treated sample into th...

Embodiment 3

[0044] (1) Preparation of sintered billet of samarium cobalt rare earth permanent magnet material: put the raw materials weighed in advance according to the stoichiometric ratio into an intermediate frequency induction furnace for smelting, wherein the mass fraction of Sm is 25.5%, Fe is 16.0%, and Co is 48.2% %, Zr is 2.3%, and Cu is 8.0%. The smelted alloy ingot is coarsely crushed and ball milled to produce alloy powder with an average particle size of 3-5 μm. The powder is oriented in a 1.5T magnetic field, and formed by vertical magnetic steel molding. The rough blank after forming is subjected to isostatic pressing, and the pressure is 250MPa. The compact was pre-fired in vacuum at 1190°C for 30 minutes, then passed through high-purity argon and heated to the sintering temperature of 1215°C and kept for 2 hours. The sintered samples were solution treated at 1190°C for 2 hours, and then air-cooled out of the furnace.

[0045] (2) Put the solution-treated sample into th...

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
flexural strengthaaaaaaaaaa
sizeaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The microwave aging treatment method for samarium-cobalt-based rare earth permanent magnet materials is to use microwave heating and heat preservation on the sintered body of samarium-cobalt rare-earth permanent magnet materials prepared by powder metallurgy to perform secondary artificial aging or multi-stage artificial aging; using microwave high-frequency electromagnetic field , on the one hand, it affects the electron spin magnetic moment orientation of the transition metal 3d shell in the alloy, weakens the bonding energy between the transition metal and the rare earth metal, and reduces the new phase Sm 2 co 17 R phase, SmCo 5 phase nucleation barrier, which is conducive to the formation of Sm 2 co 17 R phase, SmCo 5 Phase nanocrystalline particles, high saturation magnetization and high mechanical properties. On the other hand, microwave energy can be transformed into the energy of atomic diffusion, which increases the speed of atomic diffusion, accelerates the sintering process, and refines the cellular structure. The rare earth permanent magnet material processed by the method of the invention can obtain fine and uniform cell structure. It can be applied to the preparation of rare earth permanent magnet materials containing samarium, cobalt, iron, copper, zirconium or titanium with excellent mechanical properties and high magnetic properties. Suitable for industrial applications.

Description

Technical field: [0001] The invention relates to microwave aging treatment of samarium-cobalt-based rare earth permanent magnet materials, in particular to Sm 2 co 17 The invention discloses a microwave aging treatment method for rare-earth permanent magnet materials; it belongs to the technical field of heat treatment of samarium-cobalt-based rare-earth permanent magnet materials. Background technique: [0002] SmCo rare earth permanent magnets are indispensable and important metal functional materials in aerospace, microwave communication, instrumentation, electrical engineering, magnetic machinery and other fields. It is characterized by high magnetic energy product, coercive force, high Curie temperature, good corrosion resistance, and long-term stable work in high temperature and humid environments. The magnetic energy product (BH) of samarium cobalt rare earth permanent magnets max Usually 25-30MGOe. However, the mechanical properties of rare earth permanent magnet ...

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 & AuthorityPatents(China)
IPC IPC(8): C22F1/10H01F1/053
Inventor李丽娅易健宏彭元东
OwnerCENT SOUTH UNIV