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Corrosion resistance magnet and producing method thereof

A corrosion-resistant and magnet technology, applied in the field of corrosion-resistant magnets, can solve the problem of easy corrosion of magnets, and achieve the effects of high bonding strength, not easy to peel off, and easy to use.

Inactive Publication Date: 2008-01-16
AISIN SEIKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] Therefore, the rare-earth magnet itself has the problem of easily corroded materials. In addition to this problem, there is a problem that the structural defect on the machined surface must be repaired before the coating film is formed.

Method used

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  • Corrosion resistance magnet and producing method thereof
  • Corrosion resistance magnet and producing method thereof
  • Corrosion resistance magnet and producing method thereof

Examples

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Effect test

no. 1 Embodiment approach

[0050] In the corrosion-resistant magnet of the present invention, the surface of the rare earth magnet has an inactive phase including at least one element constituting the aforementioned rare earth magnet. In this way, the surface of the rare-earth magnet can be deactivated, and corrosion of the rare-earth magnet can be prevented. In addition, since the inactive phase contains at least one element among the elements constituting the above-mentioned rare earth magnet, it is easy to bond with the surface of the magnet, the bond strength is high, and the coating film is not easily peeled off.

[0051] Also, rare earth magnets are generally Re-B-Fe series or Re-Tm-B series (Re is an element selected from rare earth metals, and Tm is an element selected from transition metals. ), is composed of Re, B, Fe, etc. or Re, Tm, B, etc. various elements. In this way, the inactive phase may contain at least one element among the elements constituting the rare earth magnet.

[0052] In a...

Embodiment 1

[0094] In Examples 1 and 2, electron beams were irradiated with the temperature raised to about 1400° C. from the surface of the magnet to a thickness of 10 μm. In Example 1, electron beams were irradiated only once, and in Example 2, electron beams were irradiated continuously before and after electron beam irradiation under the same conditions as in Example 1 in order to relax the thermal stress on the magnet surface.

Embodiment 3

[0095] In Examples 3-5, electron beams were irradiated with the temperature raised to about 3000° C. from the surface of the magnet to a thickness of 10 μm. In Example 3, the electron beam was irradiated only once. Thus, during electron beam irradiation, the temperature rises sharply to about 3000°C within a short delay time determined by the heat capacity and thermal conductivity of the magnet, and the magnet is cooled down to a temperature close to the temperature in the container within a short delay time. temperature.

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Abstract

A corrosion resistant rare earth magnet and a manufacturing method of the corrosion resistant rare earth magnet comprise that the surface of the rare earth magnet is provided with an inactive phase which comprises at least one element of various kinds of elements forming the rare earth magnet. The present invention provides restoring the magnet surface of the rare earth magnet after mechanical processing, the corrosion resistant rare earth magnet which is prevented from being eroded and the manufacturing method of the corrosion resistant rare earth magnet.

Description

technical field [0001] The present invention relates to a corrosion-resistant magnet in which an active phase on the surface of a rare-earth magnet is deactivated and a method for producing the same. Background technique [0002] Rare earth magnets are generally Re-B-Fe series or Re-Tm-B series (Re is an element selected from rare earth metals, and Tm is an element selected from transition metals). As we all know, Their magnetic properties are much higher than those of original alloy magnets or ferrite magnets. [0003] However, rare earth magnets are easily rusted because they are composed of active metal materials. In particular, in order to improve the magnetic properties, a large amount of rare earth metals or transition metals is required not only in the main phase but also in grain boundaries. Corrosion is therefore an unavoidable problem for rare earth magnets. [0004] For example, for a kind of Re-B-Fe rare earth magnet, the main phase is composed of Nd 2 Fe 14...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053H01F7/02H01F41/02
Inventor 小林博
Owner AISIN SEIKI KK
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