Samarium-cobalt-base nanocrystalline permanent magnet material and preparation method thereof

A permanent magnet, samarium-cobalt technology, applied in the field of preparation of new samarium-cobalt-based nanocrystalline permanent magnets, can solve the problems of difficult control of nanocrystal size, quantity and distribution, high alloy manufacturing cost, and long preparation cycle , to achieve the effects of controlling the uniformity of the grain, enhancing the stability of the crystal structure, increasing the coercive force and saturation magnetization

Active Publication Date: 2014-10-01
嘉兴市鹏程磁钢有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melt rapid quenching method can prepare micro-nano, nano-crystalline and even amorphous alloys due to its extremely high cooling rate, but its long preparation cycle and complicated process make the manufacturing cost of the alloy high; High-energy ball milling of alloys can obtain nanocrystalline or amorphous structures in a short ball milling time, which can not only improve process efficiency, but also reduce oxidation and pollution in the process, which has attracted the attention of researchers at home and abroad.
[0005] At present, the research on preparing rare earth-transition metal permanent magnet nanomagnets by high-energy ball milling method is still in its infancy, especially for high-energy ball milled nanocrystalline composite magnets, whose magnetic energy product is usually less than 25MGOe, which is far lower than the theoretical value. The main reason is that it is difficult to control the size, quantity and distribution of nanocrystals.

Method used

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  • Samarium-cobalt-base nanocrystalline permanent magnet material and preparation method thereof
  • Samarium-cobalt-base nanocrystalline permanent magnet material and preparation method thereof
  • Samarium-cobalt-base nanocrystalline permanent magnet material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Smelting alloy: first prepare the raw materials, weigh the raw materials according to the following weight ratio: Sm17%, Lu1.5%, Co50.5%, Fe20%, Cu8%, Zr3%, after mixing, put them in a vacuum intermediate frequency induction furnace Melting into alloy ingots at high temperature, vacuumize the furnace body before melting until it reaches 2×10 -4 Pa~6×10 -4 Pa, then filled with high-purity argon to normal pressure and repeated melting at 1330°C for 3 times to ensure the uniformity of the alloy ingot, and then cooled naturally in a medium frequency induction furnace.

[0031] (2) High-energy ball milling: Mechanically crush the samarium-cobalt-based alloy ingot to a coarse powder with a particle size of 1-5 microns, and then add a mixture of 1% oleic acid and n-heptane by the total weight of the composite magnetic powder under the protection of high-purity argon as a ball milling agent (The weight ratio of oleic acid to n-heptane is 1:1). Two agate balls with a diamet...

Embodiment 2

[0035] (1) Alloy smelting: Prepare the raw materials first, and weigh the raw materials according to the following weight ratio: Sm19%, Dy2%, Co55%, Fe18%, Cu5%, Zr1%, after mixing, put them in a vacuum intermediate frequency induction furnace and melt them into alloys at high temperature For ingots, vacuumize the furnace body before smelting until it reaches 2×10 -4 Pa~6×10 -4 Pa, then filled with high-purity argon to normal pressure and repeated melting at 1325°C for 3 times to ensure the uniformity of the alloy ingot, and then cooled naturally in a medium frequency induction furnace.

[0036] (2) High-energy ball milling: Mechanically crush the samarium-cobalt-based alloy ingot to a coarse powder with a particle size of 1-5 microns, and then add a mixture of 1% oleic acid and n-heptane by the total weight of the composite magnetic powder under the protection of high-purity argon as a ball milling agent (The weight ratio of oleic acid to n-heptane is 1:1), steel balls with ...

Embodiment 3

[0039] (1) Alloy smelting: first prepare the raw materials, and weigh the raw materials according to the following weight ratio: Sm16%, Tb1%, Co50.5%, Fe25%, Cu: 5%, Zr: 2.5%, and put them in a vacuum medium frequency induction furnace after mixing Ingots are smelted at high temperature into alloy ingots. Before smelting, the furnace body is evacuated until it reaches 2×10 -4 Pa~6×10 -4 Pa, then filled with high-purity argon to normal pressure and repeated melting at 1335°C for 3 times to ensure the uniformity of the alloy ingot, and then cooled naturally in a medium frequency induction furnace.

[0040] (2) High-energy ball milling: mechanically crush samarium-cobalt-based alloy ingots into coarse powder, and then under the protection of high-purity argon, add a mixture of 3% oleic acid and n-heptane by the total weight of the composite magnetic powder as a ball milling agent, with a diameter of 16mm and a diameter of 8mm Two sizes of agate balls are used as grinding bodies,...

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Abstract

The invention relates to the metallurgy field and discloses novel samarium-cobalt-base nano-composite permanent magnetic material. The samarium cobalt base is (Sm, R)1(Co, Fe, Cu, Zr)7 in type and comprises a TbCu7 type structure, and Co is partially replaced by Fe, Cu and Zr; Re is any one of heavy rare earth Lu, Dy and Tb and partially replaces Sm. The preparation method includes steps that 1) mixing raw materials of the samarium cobalt base according to proportion, and smelting to obtain a 1: 7 type samarium cobalt base alloy ingot; 2) ball milling the alloy ingot through a high-energy ball milling technique, mixing with Fe powder according to proportion, and performing high-energy ball milling to obtain nanocrystalline composite magnetic powder; 3) carrying out annealing heat treatment on the nanocrystalline composite magnetic powder. According to the samarium-cobalt-base nanocrystalline permanent magnet material and the preparation method thereof, the soft/hard-magnetic phase composite magnetic powder is prepared through the high-energy ball milling, laser heat treatment and other techniques, a high magnetic energy product is obtained through exchange coupling between the nanocrystalline hard magnetic phase and nanocrystalline soft magnetic phase, and meanwhile, because rare-earth Fe phase is not used, the cost is lowered, and the operation technique is simplified.

Description

technical field [0001] The invention relates to a preparation method of a novel samarium-cobalt-based nanocrystalline permanent magnet, in particular to a novel (Sm,R) high magnetic energy product 1 (Co,Fe,Cu,Zr) 7 / α-Fe nanocomposite permanent magnet material formula and preparation method. Background technique [0002] Magnetic materials, especially metal magnetic materials, as an important basic metal functional material, can be made into a variety of functional materials and devices through physical effects such as energy conversion between electromagnetics, such as motors, hard disk data storage, etc. At present, it has been widely used in many fields such as aerospace, information electronics, energy, transportation, communication, medical and health, and has become one of the important material foundations for high-tech, emerging industries and social progress. [0003] At present, there are two common products in commercial SmCo permanent magnets, 1. SmCo 5 Has h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053C22C19/07C22F1/10C22F1/02B22F9/04
Inventor 陈立展张朋越泮敏翔史耀君吴钢陈立权盛冬媚
Owner 嘉兴市鹏程磁钢有限公司
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