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Heavy rare earth element attachment method for sintered NdFeB magnetic body

A heavy rare earth element and heavy rare earth technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve problems such as poor temperature characteristics, low Curie temperature point, inconsistent heavy rare earth concentration, etc., to achieve coercive force improvement, diffusion The effect of large coefficient and simple process

Inactive Publication Date: 2015-01-21
许用华
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  • Application Information

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Problems solved by technology

The disadvantage of NdFeB magnetic materials is that the Curie temperature point is low and the temperature characteristics are poor
[0008] In the "evaporation method" proposed by Chinese patent CN103646772A, the distance between the heavy rare earth and the magnet is far away, and the distance between the surface of the magnet and the heavy rare earth is inconsistent, so that the concentration of the heavy rare earth on the surface of the magnet is inconsistent, resulting in inconsistent performance of the magnet

Method used

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  • Heavy rare earth element attachment method for sintered NdFeB magnetic body
  • Heavy rare earth element attachment method for sintered NdFeB magnetic body

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Embodiment

[0034] Such as figure 2 As shown, combined with the above process flow, the metal dysprosium is subjected to saturated hydrogen absorption treatment at 400°C to obtain dysprosium hydride; 2 Under the protection of air, the dysprosium hydride is crushed into a powder with an average particle size of about 2 μm; the above crushed powder is added to gasoline to form a suspension; the suspension is evenly coated with a brush with a mesh number of 200 Both sides of the stainless steel screen 1 are dried; the sintered NdFeB blank is processed into a semi-finished product 2 of 15×15×5 (the direction of size 5 is the orientation direction); the semi-finished product 2 is subjected to pretreatment such as finishing and cleaning to make the surface smooth , clean; the stainless steel screen coated with the suspension and the semi-finished product are alternately placed in the graphite sintering box 3, and the graphite briquetting block 4 is placed on the uppermost layer, and the overal...

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Abstract

The invention discloses a heavy rare earth element attachment method for a sintered NdFeB magnetic body. The heavy rare earth element attachment method for the sintered NdFeB magnetic body includes that enabling two surfaces of a pre-processed sintered NdFeB magnetic body to stay close to an isolating layer coated with powder with heavy rare earth hydride, performing diffusing heat treatment, and enabling the heavy rare earth hydride to enter the magnetic body through grain boundary diffusion after dehydrogenation so as to effectively improve the coercive force of the magnetic body. The heavy rare earth element attachment method for the sintered NdFeB magnetic body is simple in technique, low in equipment requirement, suitable for industrial production and worthy of popularization.

Description

[0001] technical field [0002] The invention relates to the technical field of rare earth magnetic functional materials, in particular to a method for attaching heavy rare earth elements to a sintered NdFeB magnet. [0003] Background technique [0004] At present, NdFeB has a very high magnetic energy product, and the advantages of high energy density make it widely used in modern industry and electronic technology. The disadvantage of NdFeB magnetic materials is that the Curie temperature is low and the temperature characteristics are poor. The fields of energy saving and environmental protection such as new energy put forward higher requirements for the permanent magnet materials used, which not only have high magnetic energy product, but also have high coercive force. [0005] The most common way to improve the coercive force is to directly add a certain amount of heavy dilute Dy and Tb to the sintered NdFeB master alloy, and Dy / Tb and other heavy rare earth elements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F7/06
Inventor 许用华
Owner 许用华
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