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Process method for infiltrating terbium or dysprosium on the surface of NdFeB

A process method, NdFeB technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of waste of heavy rare earths, the performance of resource surface coating methods can not be controlled, etc., to improve coercivity force effect

Active Publication Date: 2022-08-05
BEIJING JINGCI ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide a process for infiltrating terbium or dysprosium on the surface of NdFeB, which solves the problem of excessive addition of heavy rare earths to waste resources and surface coating on the basis of improving the coercive force of existing NdFeB. The problem that the performance of the overlay method cannot be controlled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The process method for infiltrating terbium or dysprosium on the surface of NdFeB includes the following steps:

[0027] S1. Use the SNC-1 metal surface nanometer experiment machine to grind and sinter NdFeB magnets (brand 52SH) to refine the coarse-grained structure on the surface to nanometer level, that is, carry out nanometer treatment on the surface, and take the magnet after treatment. Clean with alcohol and get abrasives;

[0028] S2. Preliminary penetration of the surface of the magnet: use terbium oxide as the terbium supply reagent, in a closed environment, use a powder spraying device to adjust the air pressure to 0.4MPa, and uniformly blow the terbium oxide through 30min sealing spray to cover the surface of the abrasive, so as to cover the surface of the abrasive. material;

[0029] S3. The surface of the magnet is initially infiltrated: in a closed environment, the terbium oxide is heated at a high temperature and constant temperature of 2400 °C to melt i...

Embodiment 2

[0034] The process method for infiltrating terbium or dysprosium on the surface of NdFeB includes the following steps:

[0035] S1. Use the SNC-1 metal surface nanometer experiment machine to grind and sinter NdFeB magnets (brand 52SH) to refine the coarse-grained structure on the surface to nanometer level, that is, carry out nanometer treatment on the surface, and take the magnet after treatment. Clean with alcohol and get abrasives;

[0036] S2. Preliminary penetration of the surface of the magnet: use terbium oxide as the terbium supply reagent, in a closed environment, use a powder spraying device to adjust the air pressure to 0.3MPa, and uniformly blow the terbium oxide through the 60min sealing spray to cover the surface of the abrasive, so as to cover the surface of the abrasive. material;

[0037] S3. The surface of the magnet is initially infiltrated: in a closed environment, the terbium oxide is heated at a high temperature and constant temperature of 2450 °C to me...

Embodiment 3

[0042] The process method for infiltrating terbium or dysprosium on the surface of NdFeB includes the following steps:

[0043] S1. Use the SNC-1 metal surface nanometer experiment machine to grind and sinter NdFeB magnets (brand 52SH) to refine the coarse-grained structure on the surface to nanometer level, that is, carry out nanometer treatment on the surface, and take the magnet after treatment. Clean with alcohol and get abrasives;

[0044] S2. Preliminary penetration of the surface of the magnet: use terbium oxide as the terbium supply reagent, in a closed environment, use a powder spraying device to adjust the air pressure to 0.35MPa, and uniformly blow the terbium oxide through the 90min sealing spray to cover the surface of the abrasive, so as to cover the surface of the abrasive. material;

[0045] S3. The surface of the magnet is initially infiltrated: in a closed environment, keep the terbium oxide at a high temperature and a constant temperature of 2500 °C and hea...

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PUM

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Abstract

The invention discloses a process method for infiltrating terbium or dysprosium on the surface of NdFeB magnets, comprising the following steps: S1. Grinding and sintering NdFeB magnets to refine the coarse-grained structure of the surface to nanometer level to obtain abrasives; S2, The oxide or fluoride of terbium or dysprosium is evenly blown and covered on the surface of the abrasive to obtain a covering material; S3, the same oxide or fluoride of terbium or dysprosium as in step S2 is melted in a container at high temperature to obtain a molten material ; S4, the covering material is immersed in the molten material, soaked for 60-120s, and pulled out to obtain the soaking material; S5, the soaking material is cooled after vacuum annealing, and then polished and ground. The invention has the beneficial effects of solving the problem of excessively adding heavy rare earth wasting resources and the problem that the performance of the surface coating method cannot be controlled on the basis of improving the coercive force of the existing NdFeB.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment and processing. More specifically, the present invention relates to a process method for infiltrating terbium or dysprosium on the surface of NdFeB. Background technique [0002] NdFeB is the main material for making strong magnets. In order to improve the coercivity of NdFeB, a certain amount of dysprosium or terbium needs to be added. At present, in the NdFeB magnetic material industry, the main way to increase the addition of terbium or dysprosium in NdFeB is In order to add heavy rare earths and finish by surface coating, adding heavy rare earths is a waste of resources and high cost, the surface coating penetration effect is poor, the expected effect cannot be achieved, the performance cannot be effectively controlled, and the error rate is high. , which cannot be mass-produced. On the basis of improving the coercive force of the existing NdFeB, how to solve the problem of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0293H01F1/0577
Inventor 李福全
Owner BEIJING JINGCI ELECTRIC TECH CO LTD