Composition of high work temp. and high thermostability rareearth magnetic material

A technology with high thermal stability and working temperature, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of high working temperature of magnetic stability, poor thermal stability, limited wide application, etc., to achieve magnetothermal stability Good properties, high coercivity, good room temperature stability

Inactive Publication Date: 2003-08-06
ZHEJIANG UNIV +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Although Nd-Fe-B nanocomposite permanent magnets have high magnetic properties in theory, after nearly ten years of development, there is still a big gap between their actual magnetic properties and theoretical magnetic properties, and the magnetic energy product is less than the theoretical value. It has the weakness of low Curie temperature and poor thermal stability, which determines that it is difficult to enter the field that requires high magnetic stability and high working temperature
The maximum operating temperature of nano-composite Nd-Fe-B permanent magnets is generally around 80°C to 100°C. From a practical point of view, motors that account for most of the permanent magnet market require permanent magnets to have good temperature characteristics and require work The temperature is about 100 ° C ~ 180 ° C, which greatly limits the wide application of Nd-Fe-B nano-composite permanent magnets

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Preparation of raw materials: select Sm powder, Nd powder, Fe powder and Zr powder with a purity higher than 99.9%, wherein the atomic percentages of Sm, Nd, Fe, and Zr are Sm:Nd:Fe:Zr=7:0.02:91: 1.98, mix the metal powder evenly;

[0018] 2) High-energy ball milling: put the mixed raw materials into a high-energy ball mill, and ball mill for 48 hours under the protection of Ar gas with a purity of 99.999%;

[0019] 3) Crystallization heat treatment: take out the ball-milled powder and put it into a vacuum heat treatment furnace, and vacuumize the furnace so that the vacuum degree is 1×10 -3 Around Pa, the crystallization temperature is controlled at 625°C, and the heat treatment time is 10 minutes. In order to prevent excessive growth of grains, a rapid heating method is adopted during heat treatment, and the heating rate is 10°C / s;

[0020] 4) Nitriding treatment: After the crystallization treatment, put the alloy powder into a vacuum furnace and vacuumize to 1×10 ...

Embodiment 2

[0024] 1) Alloy smelting: select Sm, Nd, Fe and Ta powders with a purity higher than 99.9%, wherein the atomic percentages of Sm, Nd, Fe, and Ta are Sm:Nd:Fe:Ta=6.96:0.04:91:2, Mix the powders into a vacuum induction furnace and pump the vacuum so that the vacuum in the furnace is controlled at 1×10 -4 Pa, then filled with 1×10 3 The purity of Pa is 99.999% Ar gas, which is smelted under the protection of Ar gas. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of rare earth elements during the smelting process;

[0025] 2) Homogenization annealing: Take out the master alloy ingot and put it into the heat treatment furnace, and vacuumize to 1×10 -4 At about Pa, heat rapidly to 1020°C and keep it warm for 24 hours;

[0026] 3) Rapid quenching: remove the oxides and impurities on the surface of the annealed alloy ingot, put it into a vacuum stripping machine, re-melt it under the protection of an in...

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Abstract

This invention discloses a compositino of rare earth magnetic material of high working temperature and high thermo stabilizing with the general formula of Smx-oRo(Fe1-yMy)100-x-*N* in which, R1 is one or more one rare earth elements not including Sm, M is one or several in Nb, V, Ti, Co, Cr, Mo, Mn, Ni, Ca, Zr, Ta, Ag, Au, Al, Pb, Cu and Si, N is nitrogen, Sm is samarium, due to the exchange couple action of nm crystal retentive phase of Sm2R2-x(Re1-*M*)17Nbeta and soft magnetic phase of 2-Fe, the invented magnetic powers and adhesive magnts have high coercive force and high saturated magnetization intensity, especially the high coercive force.

Description

technical field [0001] The invention relates to a composition of rare earth magnetic material with high working temperature and high thermal stability. Background technique [0002] Among the permanent magnet materials widely used in modern industry, the latest and best performance is the rare earth permanent magnet material, which is a kind of high-performance permanent magnet material formed by rare earth elements (Sm, Nd, Pr, etc.) and transition metals (Co, Fe, etc.). magnetic material. Usually the technical parameter maximum energy product (BH) m , Remanence B r , coercive force H c etc. to measure the magnetic properties of such substances. Rare earth iron permanent magnet materials refer to permanent magnet materials based on intermetallic compounds formed by rare earth and iron. According to the manufacturing method, they are divided into sintered permanent magnet materials, heat deformable permanent magnet materials and bonded permanent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/059
Inventor 严密郑奋勇文玉华罗伟舒康颍胡军王晨杨德仁张苏凯
Owner ZHEJIANG UNIV
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