Magnetic alloy powder for permanent magnet and manufacturing method thereof

A magnetic alloy, permanent magnet technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of deterioration of magnetic powder fluidity, flattening of magnetic powder shape, reduction of molding efficiency, etc., to achieve excellent fluidity and high coercivity. The effect of magnetism

Inactive Publication Date: 2006-05-24
SUMITOMO SPECIAL METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, there is a problem that the shape of the magnetic powder is flattened because molten metal particles that are not completely cooled are violently sprayed onto the cooling plate.
The flattening of the magnetic powder deteriorates the fluidity of the magnetic powder and lowers the molding efficiency, which causes a decrease in the yield in the pressing process or the spraying process

Method used

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  • Magnetic alloy powder for permanent magnet and manufacturing method thereof
  • Magnetic alloy powder for permanent magnet and manufacturing method thereof
  • Magnetic alloy powder for permanent magnet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In this example, using master alloys having various compositions shown in Table 1 below, alloy melts were sprayed in an argon atmosphere to produce powders composed of spherical particles. The temperature of the alloy melt during spraying is about 1400-1500°C, and the temperature of the argon atmosphere is about 30°C.

[0058] Next, the thus-produced powder was classified with a sieve to obtain a powder with a particle diameter of 38 μm to 63 μm, and then the magnetic properties of the powder (residual magnetic flux density B r and coercive force H cJ ). Table 1 shows the evaluation results for sample Nos. 1 to 20. The values ​​shown in Table 1 are values ​​measured with a vibrating sample type magnetometer.

[0059] No.

Composition (mass%)

magnetic properties

Br(T)

h cJ (MA / m)

1

30.0Nd-69.0Fe-0.5B-0.5C

0.778

0.850

2

28.0Nd-69.0Fe-2.0Co-0.5B-0.5C

0.804

0.814

3

22.0Nd-8.0Pr-69...

Embodiment 2

[0075] In this example, powders were produced under the same conditions as in Example 1 using master alloys having various compositions shown in Table 3 below. The obtained spray powder is classified with a sieve to obtain a powder with a particle size of 38 μm to 63 μm, and the magnetic properties of the powder (residual magnetic flux density B r and coercive force H cJ ) for evaluation. Table 3 shows the evaluation results for sample Nos. 21 to 24.

[0076] No.

Composition (weight%)

magnetic properties

Br(T)

h cJ (MA / m)

21

30.0Nd-69.0Fe-0.98B-0.1S

0.765

0.805

22

30.0Nd-68.8Fe-1.0B-0.2Si

0.761

0.821

23

30.0Nd-68.8Fe-0.8B-0.2C-0.2S

0.755

0.845

24

30.0Nd-68.9Fe-1.0B-0.4P

0.771

0.810

[0077] In this embodiment, B is essential, and in addition to B, C, S, P, or Si is added. In this embodiment, the melt of an alloy containing Q (Q is an eleme...

Embodiment 3

[0080] The alloys of Sample Nos. 1, 3, 17, 18, 21, 22, and 24 shown in Table 1 and Table 3 above were quenched by a spraying method to be powdered. The temperature of the alloy melt during spraying was 1500° C., and other spraying conditions were the same for each sample. Then, the mass ratio (recovery rate) of the fine powder (particle diameter: 63 μm or less) contained in the sprayed powder to the whole was measured. The results are shown in Table 4 below.

[0081] Powder particles with a particle size of 63 μm or less

[0082] As can be seen from Table 4, the recoveries of samples Nos. 1, 3, 21, 22 and 24 were 70% or more, which was much higher than the recoveries of samples Nos. 17 and 18 of the comparative example. This means that the addition of C, S, P and / or Si helps to make the particle size of the spray powder smaller. The main reason for the particle size reduction is that the viscosity of the alloy melt during spraying is reduced by adding an appropri...

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Abstract

Magnetic alloy powder for a permanent magnet contains: R of about 20 mass percent to about 40 mass percent (R is Y, or at least one type of rare earth element); T of about 60 mass percent to about 79 mass percent (T is a transition metal including Fe as a primary component); and Q of about 0.5 mass percent to about 2.0 mass percent (Q is an element including B (boron) and C (carbon)). The magnetic alloy powder is formed by an atomize method, and the shape of particles of the powder is substantially spherical. The magnetic alloy powder includes a compound phase having Nd2Fe14B tetragonal structure as a primary composition phase. A ratio of a content of C to a total content of B and C is about 0.05 to about 0.90. <IMAGE>

Description

technical field [0001] The present invention relates to rare earth magnetic alloy powders used in rare earth bonded magnets and sintered magnets that can be used in various motors and actuators, and to permanent magnets produced using the magnetic alloy powders. Background technique [0002] The melt of the raw material alloy is cooled and solidified by the metal ingot method or the strip casting method, thereby using the Nd-containing 2 Fe 14 The technology in which the B-type tetragonal crystal phase is the main phase has enabled the mass production of Nd-Fe-B-based rare earth magnetic alloys. [0003] Different from the above-mentioned mass production technology, the use of the gas spraying method is disclosed in Japanese Patent Publication No. 5-18242, Japanese Patent Publication No. 5-53853, Japanese Patent Publication No. 5-59165, and Japanese Patent Publication No. 7-110966. Technology for manufacturing Nd-Fe-B series rare earth magnetic alloy powder. [0004] The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F1/06B22F9/08H01F1/057H01F1/058
CPCH01F1/0574H01F1/058
Inventor 富泽浩之金子裕治
Owner SUMITOMO SPECIAL METAL CO LTD
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