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Nd-Fe-B/Sm-Co composite bonded magnet and preparation method thereof

A nd-fe-b, sm-co technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of high input cost, material limitations, harsh processing conditions, etc.

Active Publication Date: 2018-11-27
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, people have tried various ways to improve the performance of magnets, but due to harsh processing conditions and high input costs, the practical application of materials has been limited

Method used

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  • Nd-Fe-B/Sm-Co composite bonded magnet and preparation method thereof
  • Nd-Fe-B/Sm-Co composite bonded magnet and preparation method thereof
  • Nd-Fe-B/Sm-Co composite bonded magnet and preparation method thereof

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preparation example Construction

[0029] 2. Preparation of bonded magnet

[0030] A preparation method of anisotropic Nd-Fe-B / Sm-Co composite bonded dense magnet includes the following steps:

[0031] (1) According to the pre-determined nominal composition ratio of Nd-Fe-B magnetic powder, Nd is obtained by smelting 2 Fe 14 B-type alloy ingots are cast, vacuum spinning is performed to obtain thin ribbons, and then ball milling to obtain Nd-Fe-B amorphous powder;

[0032] SmCo is obtained by smelting according to the pre-determined nominal composition ratio of Sm-Co magnetic powder 7 Type alloy ingot, then vacuum spinning to make thin strip, then ball mill to make Sm-Co amorphous powder;

[0033] (2) Hot press sintering and thermal deformation of the Nd-Fe-B amorphous powder to obtain Nd 2 Fe 14 The B-type magnet is then crushed to obtain the Nd-Fe-B magnetic powder;

[0034] The Sm-Co amorphous powder is subjected to hot press sintering and thermal deformation treatment to obtain SmCo 7 Type magnet, and then crush it to...

Embodiment 6

[0042] A preparation method of anisotropic Nd-Fe-B / Sm-Co composite bonded dense magnet, the steps are as follows:

[0043] (1) Prepare the nominal components as Sm(Co 0.7 Fe 0.21 Cu 0.06 Zr 0.03 ) 7 And Nd 13.5 Fe 77.5 Co 3 B 6 (Atomic percentage) of the metal raw materials, the use of magnetic levitation smelting to obtain alloy ingots, and repeated smelting three times to make the composition of the alloy ingots uniform, the smelted Sm(Co 0.7 Fe 0.21 Cu 0.06 Zr 0.03 ) 7 Alloy ingot and Nd 13.5 Fe 77.5 Co 3 B 6 After the alloy ingot is crushed, the strip is spun at a speed of 30m / s under argon protection, and then the prepared spun powder is subjected to vacuum ball milling for 5h to obtain Sm(Co 0.7 Fe 0.21 Cu 0.06 Zr 0.03 ) 7 Amorphous powder and Nd 13.5 Fe 77.5 Co 3 B 6 Amorphous powder.

[0044] (2) Using a spark plasma sintering furnace (SPS) at 700℃, 500MPa and 1000MPa pressure conditions, hot pressing and holding for 3 minutes, to obtain Nd-Fe-B and Sm-Co hot-pressed blocks r...

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Abstract

The invention discloses an anisotropic Nd-Fe-B / Sm-Co composite bonded compact magnet. Nd-Fe-B magnetic powder, Sm-Co magnetic powder and binding agents are compounded to form the Nd-Fe-B / Sm-Co composite bonded magnet, a main phase of the Nd-Fe-B magnetic powder is Nd2Fe14B, and a main phase of Sm-Co magnetic powder is SmCo7. The invention further discloses a method for preparing the composite bonded magnet. The method includes the steps: preparing Nd-Fe-B amorphous powder and Sm-Co amorphous powder; preparing an anisotropic Nd2Fe14B magnet and an anisotropic SmCo7 magnet by the aid of a thermal compression / thermal deformation process; crushing the magnets to obtain anisotropic magnetic powder; compositely bonding the magnetic powder, and pressing the bonded magnetic powder in an oriented manner to obtain the composite bonded compact magnet. The magnet has the advantages that the composite bonded magnet combines advantages of an Nd-Fe-B magnet and a Sm-Co magnet and has good magnetic performance of the Nd-Fe-B magnet and good high-temperature performance of the Sm-Co magnet. Compared with a single-phase Nd2Fe14B bonded magnet, the normal-temperature magnetic performance of the Nd2Fe14B / SmCo7 composite bonded magnet is close to that of the single-phase Nd2Fe14B bonded magnet, the high-temperature magnetic performance is improved, heat stability is improved, the operating temperature range is widened, and the bonded magnet is expected to partially replace the expensive SmCo7 magnet.

Description

Technical field [0001] The invention relates to a preparation method of a composite magnet, in particular to a Nd-Fe-B / Sm-Co composite bonded magnet and a preparation method thereof. Background technique [0002] Rare earth permanent magnet materials with important strategic functions are widely used in microwave communications, automation technology, aerospace, instrumentation technology, energy and other fields. The development of rare earth permanent magnetic materials has experienced the first generation of SmCo 5 , Second generation Sm 2 Co 17 , The third generation Nd 2 Fe 14 B. Three development stages. Recently, SmCo 7 Type magnets have also been studied more. Among them, SmCo 5 , Sm 2 Co 17 It has high thermal stability, strong corrosion resistance and low temperature coefficient of coercivity, but its saturation magnetization is low, resulting in a low magnetic energy product, while SmCo 7 For metastable state, it is necessary to add alloying elements to stabilize the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/059H01F41/02
CPCH01F1/0577H01F1/059H01F41/0273
Inventor 马毅龙银学国沈倩郭东林曾文
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY