Method for modifying mechanical surface of sintered nd-fe-b magnet based on plastic constraint

A surface modification, NdFeB technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of increasing the cost of magnets, damaging the magnetic properties of magnets, etc., reducing impact brittleness and improving corrosion resistance. , the effect of expanding the scope of application

Active Publication Date: 2014-03-19
东台城东科技创业园管理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will not only increase the cost of the magnet, but may also damage the magnetic properties of the magnet

Method used

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  • Method for modifying mechanical surface of sintered nd-fe-b magnet based on plastic constraint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) The sintered NdFeB magnet Nd 12 Dy 1 Fe 79.4 co 2 B 5.5 Zr 0.1 Grinding, polishing, cleaning and drying of the surface to be processed;

[0025] 2) Coating black paint on the surface of the sintered NdFeB magnet to be processed as an absorbing layer, and then fixing glass on it as a constraining layer;

[0026] 3) Cover the non-processed surface of the sintered NdFeB magnet with metal aluminum;

[0027] 4) The surface of the wrapped sintered NdFeB magnet to be processed is subjected to low-energy laser shock treatment with a nanosecond pulse laser, the laser pulse energy is 5J, the laser pulse width is 40ns, the spot diameter is 5mm, and the overlap rate is 20%;

[0028] 5) Clean the surface of the sintered NdFeB magnet after impact treatment, and use continuous CO 2 The laser is used for laser surface heat treatment, the laser power is 100W, the scanning speed is 10mm / s, the spot diameter is 0.5mm, and the overlap rate is 40%;

[0029] 6) Repeat steps 2)-5) ...

Embodiment 2

[0033] 1) The sintered NdFeB magnet Nd 11 PR 4 Dy 1 Fe 72 Ni 2 B 8 Cu 1.5 Ga 0.5 Grinding, polishing, cleaning and drying of the surface to be processed;

[0034] 2) Paste aluminum foil on the surface of the sintered NdFeB magnet to be processed as the absorbing layer, and then fix glass on it as the constraining layer;

[0035] 3) Cover the non-processed surface of the sintered NdFeB magnet with metallic copper;

[0036] 4) The surface of the wrapped sintered NdFeB magnet to be processed is subjected to low-energy laser shock treatment with a nanosecond pulse laser, the laser pulse energy is 1J, the laser pulse width is 20ns, the spot diameter is 2mm, and the overlap rate is 50%;

[0037] 5) Clean the surface of the sintered NdFeB magnet after impact treatment, and use continuous CO 2 The laser is used for laser surface heat treatment, the laser power is 500W, the scanning speed is 5mm / s, the spot diameter is 2mm, and the overlap rate is 30%;

[0038] 6) Repeat steps ...

Embodiment 3

[0042] 1) The sintered NdFeB magnet Nd 12 Ho 2 Fe 79 B 6 Al 0.5 sn 0.5 Grinding, polishing, cleaning and drying of the surface to be processed;

[0043] 2) Paste aluminum foil on the surface of the sintered NdFeB magnet to be processed as the absorbing layer, and then set flowing water on it as the constraining layer;

[0044] 3) Cover the non-processed surface of the sintered NdFeB magnet with low carbon steel;

[0045] 4) The surface of the wrapped sintered NdFeB magnet to be processed is subjected to low-energy laser shock treatment with a nanosecond pulse laser, the laser pulse energy is 2J, the laser pulse width is 30ns, the spot diameter is 3mm, and the overlap rate is 80%;

[0046] 5) Clean the surface of the sintered NdFeB magnet after impact treatment, and use continuous CO 2 The laser is used for laser surface heat treatment, the laser power is 400W, the scanning speed is 8mm / s, the spot diameter is 1mm, and the overlap rate is 60%;

[0047] 6) Repeat steps 2...

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Abstract

The invention discloses a method for modifying a mechanical surface of a sintered nd-fe-b magnet based on plastic constraint, and relates to surface modification technologies of permanent magnet materials. The method mainly comprises the steps that 1) the surface, to be processed, of the sintered nd-fe-b magnet is pretreated; 2) an absorption layer and a restraint layer are arranged on the surface, to be processed, of the sintered nd-fe-b magnet; 3) the unprocessed surface of the sintered nd-fe-b magnet is covered with plastic tough metal; 4) low-energy laser shock treatment is carried out on the covered surface, to be processed, of the sintered nd-fe-b magnet; 5) laser surface heat treatment is carried out on the cleaned surface of the sintered nd-fe-b magnet after the shock treatment; 6) the steps 2)-5) are repeated, the low-energy laser shock treatment and the laser surface heat treatment are carried out many times, and the sintered nd-fe-b magnet with the modified surface is obtained. The surface crystalline grains of the sintered nd-fe-b magnet can be effectively refined, surface layer grain boundary rich neodymium phase distribution can be homogenized, and the corrosion resisting performance of the sintered nd-fe-b magnet can be improved obviously. The method is simple in process, easy to operate, and suitable for large-scale and mass production.

Description

[0001] technical field [0002] The invention relates to the technical field of surface modification of permanent magnet materials, in particular to a method for mechanical surface modification of sintered NdFeB magnets based on plastic constraints. Background technique [0003] Sintered NdFeB magnets are a new generation of rare earth permanent magnet materials with excellent comprehensive magnetic properties. After years of hard work, their magnetic properties have been continuously improved. The maximum magnetic energy product is close to 93% of the theoretical value. It is widely used in electronics and medical treatment. Equipment, wind turbines, transportation, instrumentation and aerospace and other fields. However, the disadvantage of sintered NdFeB magnets being easy to corrode severely limits the expansion of its application range. [0004] Sintered NdFeB magnet is a polycrystalline composite phase permanent magnet material prepared by powder metallurgy process, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02C21D1/09
Inventor 崔熙贵崔承云程晓农许晓静周建忠
Owner 东台城东科技创业园管理有限公司
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