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Magnetic material and method for producing same

A technology of magnetic materials and magnets, applied in the field of magnetic materials and their manufacturing, can solve the problems of reduced magnetic properties, thermal instability, etc., and achieve the effect of high magnetic properties

Inactive Publication Date: 2013-05-01
DAIHATSU MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitrogen-based magnets have high potential and excellent magnetic properties, but due to thermal instability, the magnetic properties may decrease due to the decomposition of nitrogen-based magnet components during sintering.

Method used

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  • Magnetic material and method for producing same
  • Magnetic material and method for producing same
  • Magnetic material and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1～8

[0199] Production examples 1 to 8 (manufacture of amorphous metal)

[0200] Prepare monomer powders or lumps of Nd (neodymium), Fe (iron), Co (cobalt), Al (aluminum) and B (boron) according to the mixing ratio of the composition shown in Table 1, and arc The melting furnace was dissolved in an Ar (argon) atmosphere of 4 kPa (30 Torr) to produce alloys (ingots) having the composition ratios shown in Table 1.

[0201] Next, the obtained ingot was pulverized to obtain alloy granular materials (particle diameter: 0.5 to 10 mm).

[0202] Thereafter, the obtained alloy pellets were dissolved by high-frequency induction heating under an Ar atmosphere to form an alloy melt, and then the obtained alloy melt was placed under an Ar atmosphere with a single-roller device at a peripheral speed of 40 m / s. Rapid cooling is performed by flowing down the outer peripheral surface of the cooling roll. Thus, an amorphous metal is obtained.

[0203] Thereafter, the obtained amorphous metal was ...

manufacture example 9

[0204] Production of Production Example 9 (Production of Amorphous Metal)

[0205] Manufacture of Nd by gas atomization method (spray gas: Ar) 60 Fe 30 Al 10 After that, fine pulverization was carried out with a ball mill (LP-1 manufactured by Ito Seisakusho). Thus, Nd with a volume average particle diameter of 1 μm was obtained 60 Fe 30 Al 10 of powder.

[0206] [Evaluation]

[0207] Using DSC (differential scanning calorimetry: manufactured by SII, DSC6300), the crystallization temperature (Tx) of the amorphous metal obtained in each production example was measured, and when the amorphous metal was metallic glass, the glass transition temperature (Tg).

[0208] Specifically, 10 mg of an amorphous metal sample was put into an aluminum pan, and measured in an Ar atmosphere at a temperature increase rate of 40° C. / min.

[0209] In addition, when a plurality of crystallization reactions (Tx) were confirmed, the one with the lower temperature was measured as crystallizat...

Embodiment 1

[0215] The powder of the amorphous metal obtained in Production Example 1 and Z16 (magnetic anisotropic magnet powder, Sm-Fe-N magnet (Sm 2 Fe 17 N 3 ), a decomposition temperature of 600°C, a volume average particle diameter of 3 μm, manufactured by Nichia Chemical Industry Co., Ltd.), compounded in such a way that the amorphous metal is 10% by mass relative to their total amount, and pulverized in cyclohexane A machine (FILMICS40-40 manufactured by PRIMIX) was mixed for 5 minutes at a peripheral speed of 40 m / s.

[0216] Next, it was dried in a nitrogen atmosphere to obtain a mixed powder of an amorphous metal powder and a magnet powder.

[0217] Then, extract 1.0 g of the mixed powder and fill it into a non-magnetic mold (manufactured by HOKKAIMIC, sleeve and punch material: non-magnetic cemented carbide (WC-Ni alloy), mold material: HPM75, molding size: 8mm×6mm) , using a magnetic field extrusion machine (TM-MPH8525-10T type manufactured by Tamagawa Seisakusho), under a...

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Abstract

This method produces a magnetic material containing magnetic powder, a rare earth element, iron, and boron, forming a mixture with an amorphous metal in which the atomic proportion of the rare earth element is in a range of 22-44 atomic percent and the atomic proportion of the boron is in a range of 6-28 atomic percent and heating to a temperature of 30 DEG C lower than the crystallization temperature of the amorphous metal or higher, or, when the amorphous metal is a metallic glass, to the glass transition temperature thereof or higher.

Description

technical field [0001] The present invention relates to magnetic materials and methods for their manufacture. Background technique [0002] Conventionally, a sintered magnet having a Nd—Fe—B composition (hereinafter referred to as Nd—Fe—B sintered magnet) is known as a magnet having high magnetic properties. [0003] Such a magnet can be manufactured, for example, by subjecting magnet powder to magnetic field pressing to orientate it to improve magnetic properties, and then sintering it. [0004] More specifically, for example, the following method has been proposed: to have Nd 12.5 Fe bal co 17.5 B 6.6 Ga 0.2 Zr 0.1 Si 0.1 Composition of anisotropy and magnet powder mixed with paraffin hydrocarbons, and then its magnet powder and CaF 2 (Insulators with high resistance) are mixed and molded in a magnetic field, and then the obtained molded body is debonded, inserted into a graphite mold for spark plasma sintering, and then spark plasma sintered to manufacture high-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/08C22C45/02H01F1/053H01F41/02
CPCC22C45/02H01F41/02H01F41/0246H01F41/0273H01F1/08H01F1/0577H01F1/053H01F1/01H01F1/086H01F1/0571H01F1/059C22C1/04C22C28/00C22C33/0278C22C45/00B22F2999/00C22C2202/02B22F3/087B22F3/105B22F2003/1051C22C33/003C22C38/001C22C38/005C22C1/11B22F1/09B22F1/08C22C2200/02
Inventor 冈村兴作间所和彦
Owner DAIHATSU MOTOR CO LTD
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