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Combined type RFeB-based magnet and method for producing combined type RFeB-based magnet

A manufacturing method and combined technology, which are applied in the manufacturing field of combined RFeB magnets and combined RFeB magnets, can solve the problems of low heat resistance, achieve high heat resistance, improve the suppression effect, and suppress the occurrence of eddy currents Effect

Inactive Publication Date: 2015-04-15
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the bonded RFeB-based magnet of Patent Document 3, an adhesive is used to join the unit magnets, so it is effective in blocking eddy currents, but has a disadvantage of low heat resistance.

Method used

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  • Combined type RFeB-based magnet and method for producing combined type RFeB-based magnet
  • Combined type RFeB-based magnet and method for producing combined type RFeB-based magnet
  • Combined type RFeB-based magnet and method for producing combined type RFeB-based magnet

Examples

Experimental program
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Embodiment

[0043] (1) Example of bonded RFeB-based magnet according to the present invention

[0044] figure 1 A-1C shows a ring-shaped bonded RFeB-based magnet 10 and a unit magnet 11 of the ring-shaped bonded RFeB-based magnet 10 as an example of the bonded RFeB-based magnet according to the present invention. In the embodiment, will mainly contain Nd as the light rare earth element R L A sintered magnet was used as the unit magnet 11 . The annular combination type RFeB magnet 10 has an annular cross section ( figure 1 B) Barrel magnet. The unit magnet 11 has a partial shape obtained by dividing the annular cylindrical magnet into four pieces in units of 90° in the circumferential direction at the face 111 extending in the central axis direction of the annular cylindrical magnet. The surface 111 is a flat surface, and the surface 111 becomes the above-mentioned bonding surface. In the embodiment, the joint surface 111 is set to include the central axis, but the joint surface 111 m...

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Abstract

Provided is a combined type RFeB-based magnet, including: two or more unit magnets; and an interface material that bonds bonding surfaces of the unit magnets adjacent to each other, in which each of the unit magnets is an RFeB-based magnet containing a light rare earth element RL that is at least one element selected from the group consisting of Nd and Pr, Fe, and B, in which the interface material contains at least one compound selected from the group consisting of a carbide, a hydroxide, and an oxide of the light rare earth element RL, and in which the combined type RFeB-based magnet contains at least one element selected from the group consisting of Dy, Ho and Tb, and has a nonplanar surface.

Description

technical field [0001] The present invention relates to an RFeB-based magnet containing R (rare earth elements), Fe, and B, in particular, a bonded RFeB-based magnet including two or more unit magnets and an interface material that joins joint surfaces of adjacent unit magnets, And the manufacturing method of the combined type RFeB system magnet. Background technique [0002] The RFeB-based magnet was discovered by Sagawa et al. in 1982, and has many advantages in magnetic properties such as remanent magnetic flux density over those of permanent magnets in the prior art. Therefore, RFeB-based magnets have been used in various products such as drive motors for hybrid and electric vehicles, motors for electric-assisted bicycles, industrial motors, voice coil motors for hard disk drives, high-end speakers, earphones, and permanent magnet magnets. Resonance diagnostic device. [0003] The initial RFeB magnets have a coercive force H of various magnetic properties CJ Relativel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCB23K20/02H01F1/057B23K2201/00H01F41/00H01F7/021B23K20/026B23K20/16B23K20/233B23K2101/06B23K2103/02B23K2103/50H01F1/0576H01F1/0577H01F41/0293
Inventor 高木忍
Owner DAIDO STEEL CO LTD