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Manufacture and raw material powder of anisotropic magnetic powder and plastics magnet

An anisotropic magnetic and manufacturing method technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve the problem of inability to obtain stable heat-resistant permanent magnets, unstable permanent demagnetization rate, and anisotropy Problems such as magnetic powder performance and quality instability

Inactive Publication Date: 2005-04-20
AICHI STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, this fabrication method is based on Nd 2 Fe 14 The anisotropic magnetic powder composed of B etc. is used as the raw material. During the coating process of Dy, it is difficult to control the oxidation, which causes the performance and quality of the anisotropic magnetic powder after coating to be unstable.
As a result, magnets made of such anisotropic magnetic powder may also be unstable in the permanent demagnetization rate described later, and permanent magnets with stable heat resistance cannot be obtained.

Method used

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  • Manufacture and raw material powder of anisotropic magnetic powder and plastics magnet
  • Manufacture and raw material powder of anisotropic magnetic powder and plastics magnet
  • Manufacture and raw material powder of anisotropic magnetic powder and plastics magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Example 1 (sample No.1-1 to 1-4)

[0108] (1) Manufacture of raw material powder for anisotropic magnetic powder

[0109] ①RFeB series material (for sample A)

[0110] With the composition of A shown in Table 1, the raw material alloy or raw material elements were quantitatively weighed and dissolved using a high-frequency melting furnace to produce a 100 kg alloy ingot. Also, Table 1 is a table showing the content of each element in at% when the entire alloy is taken as 100 at% (atoms).

[0111] Thereafter, this alloy ingot was heat-treated at 1140° C. for 40 hours in an argon (Ar gas) atmosphere to homogenize the structure of the alloy ingot. In addition, the homogenized alloy ingot was pulverized into a coarse powder with an average particle diameter of 10 mm or less with a jaw crusher, and this was used as a sample of the RFeB-based material.

[0112] ②Low temperature hydrogenation process

[0113] Take 10kg of coarsely crushed RFeB-based materials (coarsely cru...

Embodiment 2

[0129] Example 2 (sample No.2-1)

[0130] A strip having the same composition (composition A) as in Example 1 was manufactured according to the steel casting method, and it was used as a sample. For this sample, the same steps as in Example 1 were carried out under the conditions shown in Table 2 to produce anisotropic magnetic powder.

Embodiment 3

[0131] Example 3 (sample No.3-1 to 3-3)

[0132] An RFeB-based material composed of the composition B shown in Table 1 was used as a sample, and the anisotropic magnetic powder was produced using this sample under the conditions shown in Table 2 in the same manner as in Example 1.

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Abstract

The invention relates to a method for producing anisotropic magnetic powder capable of obtaining plastic magnets with excellent permanent demagnetization rate. The manufacture method of the anisotropic magnetic powder of the present invention is, carry out low temperature hydrogenation process to RFeB series material (R: rare earth element), high temperature hydrogenation process and the 1st degassing process, manufacture its hydride RFeBHx powder, for this by RFeBHx Powder (raw material powder of anisotropic magnetic powder) is mixed with diffusion powder composed of dysprosium hydride, etc., and the diffusion heat treatment process and dehydrogenation process are performed to obtain anisotropic magnetic powder with excellent coercive force and anisotropy rate. Anisotropic magnetic powder. Plastic magnets made of this anisotropic magnetic powder have excellent permanent demagnetization rate.

Description

technical field [0001] The invention relates to a manufacturing method of anisotropic magnetic powder, a raw material powder of the anisotropic magnetic powder, a manufacturing method thereof and a plastic magnet. Background technique [0002] Magnets are widely used in various types of engines and many machines around us. According to the current thinner and lighter products and higher efficiency of machines, more powerful permanent magnets are required. Among the permanent magnets, the striking one is Nd 2 Fe 14 Rare-earth magnets (RFeB-based magnets) whose main components are B and the like have a wide range of uses and tend to be developed. For example, magnets for electric motors of various devices installed in the engine compartment of automobiles are being studied. However, since the high temperature in the engine compartment can exceed 100°C, high heat resistance is expected for this magnet. [0003] However, the anisotropic magnetic powder (RFeB-based magnet pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/06H01F41/02C22C38/00B22F9/00B22F1/00H01F1/053H01F1/057
CPCH01F1/0573H01F41/0293H01F41/02
Inventor 本蔵義信濱田典彦三嶋千里
Owner AICHI STEEL
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