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Rare earth permanent magnet and method for producing rare earth permanent magnet

A technology of permanent magnet and manufacturing method, which is applied in the manufacturing field of rare earth permanent magnet and rare earth permanent magnet, can solve the problems of magnetic performance decline and magnet sintering, etc., so as to prevent the decrease of coercive force, simplify the manufacturing process, and prevent processing. The effect of increased working hours

Active Publication Date: 2018-03-30
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that voids are generated between the main phase and the grain boundary phase of the sintered magnet due to the formed carbides, and the entire magnet cannot be sintered densely, resulting in a significant drop in magnetic performance.

Method used

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  • Rare earth permanent magnet and method for producing rare earth permanent magnet
  • Rare earth permanent magnet and method for producing rare earth permanent magnet
  • Rare earth permanent magnet and method for producing rare earth permanent magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0101] The example is a Nd-Fe-B based magnet, and the alloy composition is set to Nd / Fe / B=32.7 / 65.96 / 1.34 in terms of weight %. In addition, polyisobutylene (PIB) is used as a binder. In addition, the magnet raw material is pulverized by wet pulverization using toluene as an organic solvent. In addition, a green sheet is formed by coating the heated and melted mixture on the substrate by a slot die method. In addition, the calcination process is performed by pressurizing the magnet powder before forming to a pressure higher than atmospheric pressure (in addition, in this embodiment, it is assumed that the atmospheric pressure during production is standard atmospheric pressure (about 0.1 MPa)) in a hydrogen atmosphere of 0.5 MPa at 600°C. Keep it for 5 hours. In addition, the supply amount of hydrogen gas during calcination was set to 5 L / min. In addition, the sintering of the green sheet was performed by SPS sintering (pressure value: 1 MPa, sintering temperature: increased ...

Embodiment 2

[0103] The mixed binder was set as a styrene-isoprene block copolymer (SIS) which is a copolymer of styrene and isoprene. The pressure during calcination was set to 0.5 MPa. The other conditions are the same as in Example 1.

Embodiment 3

[0105] The binder to be mixed was set to polyisoprene (isoprene rubber, IR) which is a polymer of isoprene. The pressure during calcination was set to 0.5 MPa. The other conditions are the same as in Example 1.

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Abstract

The present invention provides a rare-earth permanent magnet and a method for producing a rare-earth permanent magnet capable of preventing deterioration of magnet properties. The magnet raw material is pulverized into magnet powder, and the pulverized magnet powder is mixed with a binder to form a mixture (12). Then, the resulting mixture (12) is shaped into a sheet to produce a green sheet (14). Then, the magnetic field orientation of the formed green sheet (14) is carried out, and the green sheet (14) is kept at 200° C. to 900° C. for several hours in a non-oxidizing atmosphere pressurized to a pressure higher than atmospheric pressure, thereby Carry out calcination treatment. Next, the green sheet (14) is sintered at a sintering temperature to manufacture a permanent magnet (1).

Description

Technical field [0001] The present invention relates to a rare earth permanent magnet and a method for manufacturing the rare earth permanent magnet. Background technique [0002] In recent years, permanent magnet motors used in hybrid vehicles, hard disk drives, etc., have been required to be smaller and lighter in weight, higher output, and higher efficiency. Therefore, in order to achieve the above-mentioned permanent magnet motors in terms of size and weight reduction, higher output, and higher efficiency, the permanent magnets embedded in the motors are required to be thinner and have further improved magnetic properties. [0003] Here, as a method of manufacturing the permanent magnet, for example, a powder sintering method is used. Here, in the powder sintering method, the raw material is first coarsely pulverized, and finely pulverized by a jet mill (dry pulverization) or a wet bead mill (wet pulverization) to produce magnet powder. Then, the magnet powder is put into a m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/00B22F3/02B22F3/10B22F3/14B22F3/15B22F9/04C22C33/02H01F1/057H01F1/08H01F1/113C22C38/00B22F1/10
CPCB22F3/18B22F7/04B22F2003/185B22F2999/00B22F2301/355C22C38/002C22C38/005H01F1/0577H01F1/086B22F1/10B22F2202/05B22F3/02B22F3/10B22F3/14B22F3/15B22F9/04C22C33/02C22C38/00H01F1/057H01F1/08H01F1/113H01F41/02H01F1/0536H01F41/0266
Inventor 久米克也奥野利昭尾关出光大牟礼智弘尾崎孝志太白启介山本贵士
Owner NITTO DENKO CORP