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Process for producing magnet

一种制造方法、磁铁的技术，应用在磁铁的制造领域，能够解决Br下降、化合物饱和磁化变小等问题，达到矩形比充分、磁特性的下降小、矩形比大的效果

Active Publication Date: 2015-01-14
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when an element such as Dy or Tb is selected as R of the R-Fe-B-based compound, the saturation magnetization of the compound becomes small, so when the addition amount is too large, it is easy to cause a decrease in Br.

Method used

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  • Process for producing magnet
  • Process for producing magnet
  • Process for producing magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] First, a raw material alloy is prepared so as to obtain an alloy having a composition of 24.00wt% Nd-1.00wt% Dy-5.30wt% Pr-0.450wt% Co-0.18wt% Al-0.06wt% Cu-1.00wt% B-balance Fe Rare earth magnets. As the raw material alloy, two kinds of a main phase-based alloy for mainly forming the main phase of the magnet and a grain boundary-based alloy for mainly forming grain boundaries were prepared. Subsequently, these raw material alloys were coarsely pulverized by hydrogen pulverization, and then subjected to high-pressure N 2 Air jet mill pulverization, each made into a fine powder with an average particle diameter D = 4 μm.

[0052] The obtained main phase alloy fine powder and grain boundary alloy fine powder were mixed at a ratio of the former: the latter = 95:5 to prepare a magnetic powder as a raw material powder of a rare earth magnet. Subsequently, using the magnetic powder, the molding pressure is 1.2t / cm 2 , Molding in a magnetic field was performed under the con...

Embodiment 2、3

[0057] Rare earth magnets were produced in the same manner as in Example 1, except that the dried sintered bodies were heat-treated at 900°C (Example 2) and 1000°C (Example 3), respectively.

Embodiment 4～6

[0078] First, a raw material alloy was prepared so as to obtain a rare earth magnet having a composition of 26.50wt% Nd-3.50wt% Dy-0.50wt% Co-0.22wt% Al-0.07wt% Cu-0.92wt% B-balance Fe. As the raw material alloy, two kinds of a main phase-based alloy for mainly forming the main phase of the magnet and a grain boundary-based alloy for mainly forming grain boundaries were prepared. Subsequently, these raw material alloys were coarsely pulverized by hydrogen pulverization, and then subjected to high-pressure N 2 Air jet mill pulverization to obtain fine powders with an average particle diameter D=4 μm.

[0079] The obtained fine powder of the main phase alloy and the fine powder of the grain boundary alloy were mixed at a ratio of the former: the latter = 95:5 to prepare a magnetic powder as a raw material powder of a rare earth magnet. Subsequently, using the magnetic powder, the molding pressure is 1.2t / cm 2 , Molding in a magnetic field was performed under the condition of a...

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Abstract

The invention provides a process for producing a magnet that not only allows satisfactory Br and HcJ values to be achieved but can also yield a magnet with a sufficiently large squareness ratio. The process for producing a magnet according to the invention is characterized by comprising a first step in which a heavy rare earth compound containing a heavy rare earth element is adhered onto a rare earth magnet sintered compact, and a second step in which the heavy rare earth compound-adhered sintered compact is subjected to heat treatment. The heavy rare earth compound is a hydride of the heavy rare earth element.

Description

technical field [0001] The present invention relates to a method for manufacturing a magnet, and more particularly, the present invention relates to a method for manufacturing a rare earth magnet containing a rare earth element. Background technique [0002] A rare-earth magnet having an R-Fe-B (R is a rare-earth element) system composition is a magnet having excellent magnetic properties, and many studies are being conducted to further improve the magnetic properties. As an index indicating the magnetic properties of a magnet, remanence (Br) and coercive force (HcJ) are generally used. Among them, it is known that HcJ can be increased by adding Dy or Tb to the rare earth magnet. [0003] However, when an element such as Dy or Tb is selected as R of the R-Fe-B-based compound, the saturation magnetization of the compound becomes small, and therefore, when the added amount is too large, Br tends to decrease. Therefore, in order to reduce such inconvenience, the following Pat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02B22F3/00B22F3/24C22C33/02H01F1/053H01F1/08
CPCB22F2998/10B22F2999/00B22F2998/00H01F41/0293C22C33/0278C22C2202/02H01F1/0577B22F2003/247B22F2003/248B22F9/04B22F3/02B22F3/1035B22F3/24B22F2202/05B22F1/107B22F2207/01B22F2003/242
Inventor 国枝良太中根诚马场文崇岩崎信田中哲中村英树
Owner TDK CORPARATION
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