Preparation method of Sm-Co-based amorphous nanocrystalline thin-strip magnet

An amorphous nanocrystalline, sm-co technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of low hard magnetic properties of alloys, no Sm-based amorphous alloy materials, and no High coercivity Sm-Co-based amorphous nanocrystalline alloy materials and other issues

Active Publication Date: 2012-04-04
HEBEI UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

CN100560774C discloses a Sm-Al-Co system Sm-based ternary amorphous alloy prepared by copper mold negative pressure suction casting method, and its composition range is Sm x (Al 50-y co 50+y ) 100-x (x=50~58at.%, y=-10~+7at.%), where Sm 50 Al 25 co 25 It has the best amorphous forming ability, but according to the relevant reports of the research group (Lu C.L., Liu H.M., Wang K.F, et al.Magnetic properties of Sm-based bulk metallics glasses[J].J Magn Magn Mater, 2010, 322 : 2845-2850), this series of alloys have very low hard magnetic properties, among which Sm 52 Al 24 co 24 At 300K (ie room temperature) at 2.4MA·m -1 Measured under the maximum external magnetic field, its remanence and intrinsic coercive force both tend to zero, and the magnetization under the maximum external magnetic field is only about 0.2Am 2 kg -1
So far, there have been no reports of Sm-based amorphous alloy materials with high coercivity at room temperature, let alone reports of Sm-Co-based amorphous nanocrystalline alloy materials with high coercivity.

Method used

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  • Preparation method of Sm-Co-based amorphous nanocrystalline thin-strip magnet
  • Preparation method of Sm-Co-based amorphous nanocrystalline thin-strip magnet
  • Preparation method of Sm-Co-based amorphous nanocrystalline thin-strip magnet

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Embodiment 1

[0043] Sm of Sm-Co-based Amorphous and Nanocrystalline Thin Strip Magnet 11.3 co 56.6 Fe 7.5 Zr 4.7 B 3.8 (Nb 4.7 Al 5.7 Si 4.7 C 1.0 ) A preparation method of an amorphous nanocrystalline thin strip magnet.

[0044] The first step, raw material preparation

[0045] According to the raw material ratio Sm in atomic percentage 11.3 co 56.6 Fe 7.5 Zr 4.7 B 3.8 (Nb 4.7 Al 5.7 Si 4.7 C 1.0 ), take raw material pure Sm, pure Co, pure Fe, pure Zr, B-Fe alloy, pure Nb, pure Al, pure Si and pure graphite C powder, additionally add the pure The mass percentage of Sm is 3% pure Sm, thus completing the raw material preparation.

[0046] The second step is to melt the raw materials to prepare master alloy ingots

[0047] Put all the raw materials prepared in the first step into the crucible of the vacuum arc melting furnace. When melting, first vacuumize the furnace body to 10 -3 Pa, the temperature of the furnace is raised above the melting point of the raw metal Zr, u...

Embodiment 2

[0052] Except that the peripheral speed of the cooling molybdenum roller wheel rotation of the third step in embodiment 1, that is, the rapid quenching speed of the melt becomes 5m·s -1 Except, others are all the same as embodiment 1, and the prepared Sm 11.3 co 56.6 Fe 7.5 Zr 4.7 B 3.8 (Nb 4.7 Al 5.7 Si 4.7 C 1.0 ) The magnetic properties, thickness and average grain size parameters of the main crystal phase of the amorphous and nanocrystalline thin strip magnets are shown in Table 1.

Embodiment 3

[0054] Except the circumferential speed that the cooling molybdenum roll wheel of the third step in the embodiment 1 rotates, the rapid quenching speed of the melt becomes 15m·s -1 Except, others are all the same as embodiment 1, and the prepared Sm 11.3 co 56.6 Fe 7.5 Zr 4.7 B 3.8 (Nb 4.7 Al 5.7 Si 4.7 C 1.0 ) The magnetic properties, thickness and average grain size parameters of the main crystal phase of the amorphous and nanocrystalline thin strip magnets are shown in Table 1.

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Abstract

The invention relates to a preparation method of a Sm-Co-based amorphous nanocrystalline thin-strip magnet, and relates to a rare earth metal and magnetic transition metal containing magnet made of a hard magnetic material. The Sm-Co-based amorphous nanocrystalline thin-strip magnet has a chemical formula of SmxCoyFezZruBvQw, wherein the symbols of qualified elements metered by atomic percentage meet the following conditions: x + y + z + u + v + w = 100, x = 9.0-14.0, y = 45.0-70.5, z = 2.8-18.4 , u = 1.1-7.0, v = 3.8-19.0, w = 1.0-21.2, and Q is one to four elements of Nb, Al, Si, Cu and C. The Sm-Co-based amorphous nanocrystalline thin-strip magnet prepared by a centrifugal fast quenching and strip throwing technology has the advantages of high room temperature intrinsic coercivity, high resistance to corrosion and high strength.

Description

technical field [0001] The technical scheme of the invention relates to a magnet of hard magnetic material containing rare earth metal and magnetic transition metal, in particular to a preparation method of a Sm-Co based amorphous nanocrystalline thin strip magnet. Background technique [0002] Amorphous state refers to a state in which atoms in the internal structure of a substance are arranged in a long-range disorder. In 1960, Klement et al. (Klement W., Willens R.H., Duwez P. Non-crystalline structure in solidified gold-silicon alloys [J]. Nature, 1960, 187: 869-870) successfully applied the rapid quenching technology to Au for the first time. - Cooling of the Si alloy, an alloy with an amorphous structure is obtained, also known as a metallic glass. Due to the long-range atomic disordered structure of metallic glasses, which have the properties of solid and liquid, metal and glass, they exhibit many unique properties, such as excellent magnetic properties, high corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F7/02H01F1/047C22C45/00B22D11/06
Inventor 孙继兵步绍静崔春翔杨薇丁贺伟韩瑞平
Owner HEBEI UNIV OF TECH
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