Rare earth cobalt permanent magnet material with high working temperature and low magnetic change and preparation method

A technology of working temperature and permanent magnet materials, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of large differences in magnetic properties, and achieve small differences in magnetic properties, high operating temperature, and high application value effect

Active Publication Date: 2020-06-09
绵阳西磁磁业有限公司
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Problems solved by technology

[0005] Aiming at the problems in the prior art that the operating temperature of permanent magnet materials does not exceed 500°C, and the difference in magnetic properties between room temperature and high temperature operating conditions affects practical applications, the present invention provides a rare earth cobalt with high operating temperature and low magnetic change A permanent magnet material and a preparation method thereof, the purpose of which is to increase the working temperature of the permanent magnet material, and at the same time make the difference between the high temperature magnetic performance and the room temperature magnetic performance small

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  • Rare earth cobalt permanent magnet material with high working temperature and low magnetic change and preparation method
  • Rare earth cobalt permanent magnet material with high working temperature and low magnetic change and preparation method
  • Rare earth cobalt permanent magnet material with high working temperature and low magnetic change and preparation method

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preparation example Construction

[0037] The preparation method of the above-mentioned rare earth cobalt permanent magnet material with high working temperature and low magnetic change specifically includes the following steps:

[0038] [1] Preparation of alloy ingot:

[0039] Ingredients: component A alloy weighs the raw materials of samarium, cobalt, copper, iron and zirconium according to the mass fraction percentage of component A; weighs the raw materials of HRE, cobalt, copper, iron and zirconium according to the mass fraction percentage of component B; raw material.

[0040] Intermediate frequency induction argon protection melting alloy: put the prepared raw materials into the crucible of intermediate frequency induction furnace; vacuumize to better than 0.80×10 -2 Pa; then fill the melting furnace with argon until the pressure in the furnace is 0.05MPa-0.08MPa; gradually increase the heating power until the raw materials are melted to boiling; keep boiling for 1-3 minutes; stop heating and keep it for ...

Embodiment 1

[0053] A component composition: u=0.11, v=0.19, w=0.028, Z=6.7

[0054] B component composition: u'=0.11, v'=0.19, w'=0.028, Z'=7.0

[0055] The components A and B are subjected to intermediate frequency smelting respectively to prepare material blanks. When making powder, pass through a 20-mesh sieve, the mixed mass percentage of the two components is 100% of component A, 0% of component B, the orientation magnetic field is about 960kA / m, the sintering temperature is 1205°C, the holding time is 1h, solid melting The temperature is 1170°C, the solid melting time is 2h, the heat treatment temperature is 820°C, and the holding time is 12h. Prepare test samples conforming to GB / T3217, the specific size is Φ10×10mm, use the "NIM-500C permanent magnet material ultra-high temperature measurement system" of the China Institute of Metrology to test the demagnetization curves of the samples at different temperatures, and the results are shown in Table 1. Br 500 / Br RT = 68.6%.

[...

Embodiment 2

[0059] A component composition: u=0.11, v=0.19, w=0.028, Z=6.7

[0060] B component composition: u'=0.11, v'=0.19, w'=0.028, Z'=7.0

[0061] The components A and B are subjected to intermediate frequency smelting respectively to prepare material blanks. Among them, the 20-mesh sieve is passed through the powder making process, the mixed mass percentage of the two components is 70% of component A, 30% of component B, the orientation magnetic field is about 960kA / m, the sintering temperature is 1215°C, the holding time is 1h, solid melting The temperature is 1170°C, the solid melting time is 2h, the heat treatment temperature is 820°C, and the holding time is 12h. Prepare test samples conforming to GB / T3217, the specific size is Φ10×10mm, use the "NIM-500C permanent magnet material ultra-high temperature measurement system" of the China Institute of Metrology to test the demagnetization curves of the samples at different temperatures, and the results are shown in Table 2. Br ...

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Abstract

The invention belongs to the field of manufacturing of rare earth permanent magnet materials, and particularly relates to a high-working temperature low-magnetic variation rare earth-cobalt permanentmagnet material and a preparation method. In order to solve the problems that in the prior art, the working temperature of a permanent magnet material is not higher than 500 DEG C, and practical application is influenced due to the fact that the permanent magnet material has a great magnetic performance difference under the room temperature working condition and the high temperature working condition, the rare earth-cobalt permanent magnet material is prepared from alloys including the A component and the B component, and the chemical formula of the material is A1-xBx, wherein in the chemicalformula, x=0-1; the chemical formula of the A component is Sm(Co1-u-v-wCuuFevZrw)Z, wherein in the chemical formula, Z-6.5-7.5, u=0.08-0.13, v=0.09-0.22, and w=0.027-0.033; and the chemical formula ofthe B component is HRE(Co1-u'-v'-w'Cuu'Fev'Zrw')Z', wherein in the chemical formula, HRE is one or more heavy rare earth elements in Gd, Er, Tb and Ho, Z'=6.8-7.8, u'=0.08-0.13, v'=0.09-0.22, and w'=0.027-0.033. The invention further provides the preparation method of the material. The material is applied to high-working temperature application occasions such as aviation and aerospace systems andthe like.

Description

technical field [0001] The invention belongs to the field of manufacturing rare earth permanent magnet materials. Specifically, it relates to a rare earth cobalt permanent magnet material with high working temperature and low magnetic change and a preparation method thereof. Background technique [0002] The most basic function of a permanent magnet is to generate a constant magnetic field in a specific space, and to maintain this magnetic field does not require any external power supply. Since the late 1960s, rare earth permanent magnet materials with high magnetic energy product and high coercive force have been developed rapidly. Many important devices such as generators, transmissions, sensors, functional converters, magnetic bearings, microwave functional devices, and inertial navigation devices in aviation and aerospace systems need to use permanent magnet materials that can withstand high temperatures and high performance. Rare earth cobalt Permanent magnet material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F41/02
CPCH01F1/0557H01F41/0253H01F41/0266
Inventor 沈安国田小林何永兴
Owner 绵阳西磁磁业有限公司
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