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Process for producing magnet

A manufacturing method and magnet technology, which is applied in the field of magnet manufacturing, can solve problems such as the decrease of Br and the reduction of saturation magnetization of compounds, and achieve the effects of sufficient squareness ratio, small decline in magnetic properties, and large squareness ratio

Active Publication Date: 2009-09-23
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 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 perfo...

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 object of the invention is to provide a process for magnet production by which a magnet not only having sufficient values of Br and HcJ but having a sufficiently high squareness ratio can be obtained. The process for magnet production is characterized by comprising a first step in which a heavy rare-earth compound containing a heavy rare-earth element is adhered to a sinter of a rare-earth magnet and a second step in which the sinter having the heavy rare-earth compound adherent thereto is heat-treated, the heavy rare-earth compound being the hydride of a 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 Applications(China)
IPC IPC(8): H01F41/02B22F3/00B22F3/24C22C33/02H01F1/053H01F1/08
CPCB22F2998/10H01F41/0293C22C2202/02B22F2999/00H01F41/026C22C33/0278B22F2998/00H01F1/0577B22F2003/247B22F2003/248B22F9/04B22F3/02B22F3/1035B22F3/24B22F2202/05B22F1/107B22F2207/01B22F2003/242
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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