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Rare earth permanent magnet material and preparation method thereof

A rare earth permanent magnet, permanent magnet technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of the decline of the magnetic properties of permanent magnets, the rapid emergence of unfavorable products, and the high price of dysprosium elements, so as to improve performance and promote industrial process, the effect of small size

Inactive Publication Date: 2011-12-21
NINGBO STAR MATERIALS HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at the same time, the addition of dysprosium will cause a large decrease in the magnetic properties of the permanent magnet.
Moreover, the price of dysprosium element is expensive, and its price has reached 4400 yuan / Kg at present, so in the process of mass production, the production cost will be greatly increased
Moreover, the preparation process of the existing 2:17 type samarium cobalt alloy is complex, which increases the production cycle and is not conducive to the rapid emergence of products

Method used

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  • Rare earth permanent magnet material and preparation method thereof
  • Rare earth permanent magnet material and preparation method thereof
  • Rare earth permanent magnet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh raw materials: samarium, cobalt, iron, copper, zirconium, dysprosium, gadolinium, erbium; ratio of various raw materials: samarium 16.9%, cobalt 49%, iron 15.5%, copper 6.3%, zirconium 2.6%, dysprosium 1.6%, gadolinium 5.8%, erbium 2.3%.

[0028] (2) Manufacture of quick-setting cast pieces: prepare alloy cast pieces by quick-setting thin slice technology (quick-setting thin slice technology is a mature technology applied to the NdFeB industry, which belongs to the conventional technology in the field, and will not be described here) to obtain fine grains , Alloy casting sheet with uniform composition;

[0029] (3) Pulverizing: carry out hydrogen crushing and rod milling to the alloy cast sheet obtained in step (2), obtain the magnetic powder of average particle size 3.0~5 microns; ) into the reaction vessel of hydrogen to make the hydrogen pressure reach 1MPa, raise the temperature to 150°C and keep it warm for 20h, so that the hydrogen absorption reaction b...

Embodiment 2

[0036] Raw materials: samarium, cobalt, iron, copper, zirconium, dysprosium, gadolinium, erbium

[0037] The ratio of various raw materials: Samarium 16.8%, Cobalt 50%, Iron 16%, Copper 5.8%, Zirconium 2.9%, Dysprosium 2.0%, Gadolinium 4.1%, Erbium 2.4%.

[0038] The preparation method is the same as in Example 1.

[0039] The test performance of the samarium-cobalt permanent magnet sample prepared in this embodiment is shown in Table 2 below:

[0040] The test performance of table 2 embodiment 2 samarium cobalt permanent magnet sample

[0041]

Embodiment 3

[0043] Raw materials: samarium, cobalt, iron, copper, zirconium, dysprosium, gadolinium, erbium

[0044] The ratio of various raw materials: samarium 19.1%, cobalt 48.2%, iron 14.2%, copper 4.9%, zirconium 3%, dysprosium 2.5%, gadolinium 3.5%, erbium 4.6%.

[0045] The preparation method is the same as in Example 1.

[0046] The test performance of the samarium cobalt permanent magnet sample prepared in this embodiment is shown in the following table 3:

[0047] The test performance of table 3 embodiment 3 samarium cobalt permanent magnet samples

[0048]

[0049] It can be seen from the samples prepared in the above examples that the samarium cobalt permanent magnet of the present invention still has the advantages of high magnetic energy product and low temperature coefficient of remanence under the premise of reducing cost.

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Abstract

The invention discloses a rare earth permanent magnet material, which is prepared from the following components in weight percentage: 14-20% of samarium, 45-50% of cobalt, 12-16% of iron, 3-7% of copper, and 1-3% of zirconium %, heavy rare earth elements 5 to 15%. The invention also discloses a preparation method of the above-mentioned rare earth permanent magnet material: (1) weighing the raw material; (2) preparing an alloy casting sheet with fine grain and uniform composition through the quick-setting sheet technology; (3) making the quick-setting casting sheet Carry out hydrogen crushing and rod milling to obtain magnetic powder with an average particle size of 3.0-5 microns; (4) Compress the magnetic powder under a magnetic field of 2-2.5T; (5) Sintering: Sinter the compacted blank under the protection of argon ; (6) aging: the sintered blank is kept warm, cooled, and quickly air-cooled to room temperature to obtain a samarium-cobalt permanent magnet. The rare earth permanent magnet of the invention not only has a lower remanence temperature coefficient but also has a high magnetic energy product, and has low manufacturing cost and simple process.

Description

Technical field: [0001] The invention relates to the technical field of samarium-cobalt permanent magnet materials, in particular to a samarium-cobalt rare earth permanent magnet material with an ultra-low temperature coefficient of 2:17 and a preparation method thereof. Background technique: [0002] SM 2 co 17 The permanent magnet is the first generation of rare earth permanent magnet SmCo in the 1970s 5 The second generation of rare earth permanent magnets developed on the basis of magnets. It is a permanent magnet material based on an intermetallic compound formed by rare earth metal samarium (Sm) and 3d transition metal cobalt (Co). It has the characteristics of high Curie temperature (higher than 820°C), high intrinsic coercive force and low temperature coefficient, and has been widely used in microwave communication, electrical engineering, instrument technology, computer technology, automation technology and other fields. SM 2 co 17 Although permanent magnet ma...

Claims

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Application Information

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IPC IPC(8): H01F1/053C22C30/02B22F3/16C22F1/16
Inventor 潘道良苏广春关井和
Owner NINGBO STAR MATERIALS HI TECH
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