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Method for producing sintered body that forms rare-earth permanent magnet and has non-parallel easy magnetization axis orientation

一种制造方法、易磁化轴的技术，应用在永磁体制造、磁路形状/式样/结构、电感/变压器/磁铁制造等方向，能够解决无法制造、磁化方向受限、无法获得永磁体等问题

Active Publication Date: 2017-12-01
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even in the case of this arrangement, the achievable magnetization directions are limited, and therefore, it is impossible to obtain a permanent magnet whose magnetization directions are oriented in various directions.
[0006] Furthermore, in the permanent magnet obtained by the method described in Patent Document 2, since a plurality of magnet pieces are joined, the mechanical strength may be lowered.
In addition, there is also a problem that if the number of magnet pieces increases, the magnet properties will decrease.
The magnet produced by the method described in Patent Document 9 has a structure in which the axis of easy magnetization is oriented along one direction, and this method cannot produce a single sintered magnet in which magnet material particles in arbitrary multiple regions have different magnetic properties. orientation of the magnet

Method used

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  • Method for producing sintered body that forms rare-earth permanent magnet and has non-parallel easy magnetization axis orientation
  • Method for producing sintered body that forms rare-earth permanent magnet and has non-parallel easy magnetization axis orientation
  • Method for producing sintered body that forms rare-earth permanent magnet and has non-parallel easy magnetization axis orientation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] Made in the following order Figure 7 The first molded body and the second molded body of the shapes shown in (a) and (b). Here, the thickness of the first molded body 123 is 1.60 mm, the overall width is 25 mm, and the widths of the end regions 7 a and 8 a are both 8 mm. In the end regions 7a and 8a, the radius of curvature of the first surface is 19.80 mm, the radius of curvature of the second surface is 21.50 mm, and the center of curvature extends from the end of the central region 6 a at right angles to the surface of the central region 6 a. on the imaginary line.

[0154]

[0155] The alloy composition A (containing Nd: 23wt%, Pr: 6.75wt%, B: 1.00wt%, Ga: 0.1wt%, Nb: 0.2wt%, An alloy of Co: 2.0 wt%, Cu: 0.1 wt%, the remainder being Fe, and other unavoidable impurities) was maintained at 0.85 MPa for 1 day. Thereafter, hydrogen fragmentation was carried out by maintaining at 0.2 MPa for 1 day while cooling.

[0156]

[0157] 1.5 kg of Zr beads (2φ) were mix...

Embodiment 2、3

[0176] Except having changed into the conditions described in Tables 2-4, it carried out similarly to Example 1, and obtained each sintered compact. However, the thickness of the first molded body 123 is 2.0 mm in Example 2 and 2.5 mm in Example 3.

[0177] In addition, jet mill pulverization was performed as follows. After mixing 1 part by weight of methyl hexanoate with 100 parts by weight of the hydrogen-pulverized coarse alloy powder, it was pulverized by a helium jet mill pulverizer (device name: PJM-80HE, manufactured by NPK). The collection of pulverized alloy particles is separated and recovered by a cyclone method, and ultrafine powder is removed. The supply speed during pulverization is 1kg / h, the introduction pressure of He gas is 0.6MPa, and the flow rate is 1.3m 3 / min, the oxygen concentration is below 1ppm, and the dew point is below -75°C.

[0178] In addition, when oleyl alcohol type is used at the time of kneading, it carries out as follows. 40 parts by w...

Embodiment 4

[0202] A ring-shaped sintered body was obtained by performing the same operations as in Example 1 for steps other than the deformation step and the sintering step. The deformation step and the sintering step are performed as follows.

[0203]

[0204] Composites to have Figure 17 Fill the mold made of stainless steel (SUS) with a cavity of the shape shown in (a), and apply an external magnetic field of 12T in a direction parallel to the thickness direction of the trapezoid while heating it to 80°C in a solenoid coil, In a state maintained at 80° C., the molded body having the oriented easy axis of magnetization was taken out from the die after being pulled directly from the solenoid coil.

[0205] Next, the oriented molded body is placed in a trapezoidal shape with the longer base on the outer peripheral side of the cavity and the shorter base on the inner peripheral side. Figure 17 A graphite mold having a ring-shaped cavity shown in (b) is rolled into a ring shape to d...

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Abstract

Provided is a method for producing a sintered body that forms a rare-earth permanent magnet, has a single sintered structure and an arbitrary shape, and has easy magnetization axis orientations of different directions applied to the magnet material particles in a plurality of arbitrary regions. This method forms a three-dimensional first molded article from a composite material formed by mixing a resin material and magnet material particles containing a rare-earth substance. While keeping the first molded article at a temperature higher than the softening temperature of the resin, a parallel external magnetic field having parallel magnetic flux is imparted to the first molded article, and as a result, the axis of easy magnetization of the magnet material particles is oriented in parallel to the direction of the external magnetic field. Then, by subjecting the first molded article to a deforming force such as one that changes the horizontal cross-sectional shape of at least one section of a horizontal cross-section of the first molded article, a second molded article is formed in which the orientation direction of the easy magnetization axis of the magnet material particles in at least the one section of the horizontal cross-section is changed to a direction which differs from the orientation direction of the first molded article. The second molded article is heated to a sintering temperature and kept at the sintering temperature for a prescribed period of time. The resin inside the second molded article is vaporized, which forms a sintered body in which the magnet material particles are sintered to one another.

Description

technical field [0001] The present invention relates to a method for producing a sintered body for forming a rare earth permanent magnet for forming a rare earth permanent magnet. In particular, the present invention relates to a method for producing a sintered body for forming a rare earth permanent magnet having partitions with easy magnetization axes oriented non-parallel. Background technique [0002] Rare-earth sintered magnets are attracting attention as high-performance permanent magnets that can expect high coercive force and residual magnetic flux density, and are being developed and developed for higher performance. Published in, for example, the Journal of the Japan Institute of Metals, Vol. 76, No. 1 (2012), pages 12 to 16 of Une Yasuhiro et al., titled "High coercive force of Nd-Fe-B sintered magnets based on crystallization" The paper (Non-Patent Document 1) describes the following example: Based on the well-known knowledge that the coercive force increases wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08H01F7/02H02K1/27
CPCH01F7/02H02K1/27H01F41/0273H01F1/0577H01F41/028H01F41/0293H01F1/442H01F1/42H01F1/057H01F1/086
Inventor 藤川宪一久米克也大内一男星野利信森本政和大野博文中林克之山口美穗松尾洋奥野利昭藤原诚井本荣一江部宏史大牟礼智弘尾关出光山本贵士加藤有树松田知也齐藤正一朗
Owner NITTO DENKO CORP