A kind of r-t-b permanent magnet material, raw material composition, preparation method, application

A technology of R-T-B and permanent magnet materials, which is applied in the direction of magnetic materials, magnetic circuits characterized by magnetic materials, magnetic objects, etc., can solve the problems that Hcj and Br cannot be improved at the same time, and achieve mass production and large temperature range , excellent performance

Active Publication Date: 2020-11-27
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a kind of R-T-B permanent magnet material, raw material composition, preparation method and application in order to overcome the defect that Hcj and Br of R-T-B permanent magnet material in the prior art cannot be improved simultaneously.

Method used

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  • A kind of r-t-b permanent magnet material, raw material composition, preparation method, application
  • A kind of r-t-b permanent magnet material, raw material composition, preparation method, application
  • A kind of r-t-b permanent magnet material, raw material composition, preparation method, application

Examples

Experimental program
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Effect test

Embodiment 1

[0104] (1) casting process: the raw material composition shown in embodiment 1 in following table 1, get the composition of corresponding proportioning and put into vacuum melting furnace at 5 * 10 -2 Vacuum smelting is carried out at a temperature below 1500°C in a vacuum of Pa; and then the molten liquid obtained by smelting is cast by a strip continuous casting method to obtain an alloy sheet with a thickness of 0.2 mm.

[0105] (2) Coarse crushing process: at room temperature, place the alloy flakes in step (1) in flowing hydrogen, and carry out hydrogen adsorption treatment for 1 hour. After fully absorbing hydrogen, heat up while vacuuming, and fully dehydrogenate. The dehydrogenation treatment is carried out at ℃ for 2 hours to obtain a coarsely pulverized powder, the particle size of which is D50300 μm.

[0106] (3) Micro-grinding process: the coarsely-grinded powder in step (2) is fine-grinded using a collision-plate jet mill device in a nitrogen stream to obtain a fi...

Embodiment 3～7、 comparative example 2～3 and comparative example 5～6

[0115] The R-T-B series permanent magnet material corresponding to Embodiment 3~7, Comparative Examples 2~3 and Comparative Examples 5~6 is obtained by the raw material composition shown in Table 1, wherein, Embodiment 3~7, Comparative Examples 2~3 The preparation process of Comparative Examples 5-6 is the same as that of Example 1.

Embodiment 2、 Embodiment 8 and comparative example 1 and comparative example 4

[0117] (1) Casting process: according to the raw material composition shown in Table 1, get the raw material of corresponding ratio and put it into the vacuum melting furnace at 5×10 -2 Vacuum smelting is carried out at a temperature below 1500°C in a vacuum of Pa; and then the molten liquid obtained by smelting is cast by a strip continuous casting method to obtain an alloy sheet with a thickness of 0.3mm.

[0118] (2) Coarse crushing process: at room temperature, place the alloy flakes in step (1) in flowing hydrogen, and carry out hydrogen adsorption treatment for 2 hours. After fully absorbing hydrogen, heat up while vacuuming, and fully dehydrogenate. dehydrogenation treatment for 3 hours at °C to obtain a coarsely pulverized powder, the particle size of which is D50 400 μm.

[0119] (3) Micro-grinding process: use a collision plate jet mill device in nitrogen flow to finely pulverize the coarsely pulverized powder in step (2) to obtain a finely pulverized powder with an ...

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Abstract

The invention provides an R-T-B series permanent magnet material and a raw material composition thereof, a preparation method of a R-T-B series permanent magnet material and application of a R-T-B series permanent magnet material. The R-T-B series permanent magnet material comprises the following components in percentage by weight: 29.0-33 wt% of R, wherein the content of RH is less than 1.5 wt%;0.40-0.60 wt% of CU; 0.5-1.5 wt% of Co; 0.98-1.05 wt% of B; 0.4-0.8 wt% of Al; 0.2-0.3 wt% of Ga; and 63-68 wt% of Fe. The R-T-B series permanent magnet material is excellent in performance, and Br and Hcj can be synchronously improved; and the liquid-phase melting point of the R-T-B series permanent magnet material is greatly reduced, so that the optimal tempering temperature range is very large,and the temperature difference requirement on equipment is low.

Description

technical field [0001] The invention relates to an R-T-B series permanent magnet material, a raw material composition, a preparation method and an application. Background technique [0002] Permanent magnetic materials have been developed as key materials supporting electronic devices, and the development direction is toward the direction of high magnetic energy product and high coercive force. R-T-B permanent magnet material (R is at least one of the rare earth elements and must contain at least one of Nd and Pr) is known as the highest performance magnet among permanent magnets, and is used in voice coil motors (VCM) of hard disk drives , Motors for electric vehicles (EV, HV, PHV, etc.), motors for industrial equipment, and other motors and home appliances. [0003] R-T-B series permanent magnet materials are mainly composed of R 2 T 14 The main phase of the B compound and the grain boundary phase located in the grain boundary portion of the main phase are constituted. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/00H01F41/02H02K1/02C22C38/10C22C38/06
CPCC22C38/002C22C38/005C22C38/06C22C38/10H01F1/0577H01F41/00H01F41/0253H01F41/0266H02K1/02
Inventor 孙璐施尧黄佳莹蓝琴
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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