High-corrosion-resistance multi-hard-magnetic-principal-phase Ce permanent magnet and preparation method thereof

A permanent magnet, multi-hard magnetic technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc.

Active Publication Date: 2016-01-06
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the common feature of patent applications CN1035737A, CN102436892A and CN101694797 is that Nd accounts for the largest weight of the total rare earth in the magnet, and still belongs to the category of Nd-Fe-B magnets, while the patent applications CN103714939A and CN102800454A are La and Ce respectively. The weight of the total amount is the largest, and it does not belong to the category of Nd-Fe-B magnets, but the above-mentioned patent application belongs to the dual (hard magnetic) main phase magnet, and the corrosion resistance of La, Ce, and magnets needs to be improved

Method used

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  • High-corrosion-resistance multi-hard-magnetic-principal-phase Ce permanent magnet and preparation method thereof
  • High-corrosion-resistance multi-hard-magnetic-principal-phase Ce permanent magnet and preparation method thereof
  • High-corrosion-resistance multi-hard-magnetic-principal-phase Ce permanent magnet and preparation method thereof

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preparation example Construction

[0074] The invention provides a high corrosion resistance, multi-main phase Ce permanent magnet preparation method, according to the performance requirements of the multi-hard magnetic main phase Ce-Fe-B permanent magnet alloy, design the main phase with different k values ​​(anisotropy constants) Alloy, so as to determine the phase structure composition of Ce-Fe-B permanent magnets with different multi-hard magnetic main phases, such as multi-phase permanent magnets composed of Ce-Fe-B and Nd-Fe-B, Pr-Fe-B, Dy-Fe-B Hard magnetic main phase structure, or multiple hard magnetic main phases composed of (Pr, Ce)-Fe-B and Nd-Fe-B, (Pr, Dy)-Fe-B, (Ho, Gd)-Fe-B Structure; in the final magnet, Ce is the rare earth element with the most content in terms of mass percentage, and 0% to 75% of the total rare earth content is replaced by one or both of La, Nd, Pr, Dy, Ho, Gd, Er One or more mixed rare earth substitutes. The method comprises the following process steps:

[0075] (1) A var...

Embodiment 1

[0089] Embodiment 1-is Ce-Fe-B / Nd-Fe-B / Dy-Fe-B three hard magnetic main phase structure

[0090] Design composition (Ce 0.5 Nd 0.45 PR 0.05 ) 29 Fe 68.1 B 0.9 tm 2 (TM = Ga, Co, Cu, Nb).

[0091] (1) According to the alloy mass percentage composition Ce 29 Fe 68.15 B 0.85 tm 2 ,Nd 28.5 Fe 68.6 B 0.9 tm 2 and Dy 29.1 Fe 68.9 B 1 tm 2 Prepare raw materials separately.

[0092] (2) Melt the prepared raw materials separately. First put the raw materials into the quick-setting crucible of the intermediate frequency induction melting furnace, and when the vacuum degree reaches 10 -2 When the Pa is above, power on and preheat, and wait until the vacuum degree reaches 10 again. -2 When the Pa exceeds Pa, stop vacuuming and fill with high-purity Ar to make the Ar pressure in the furnace reach 0.08MPa for smelting. After all the raw materials are melted, they are refined by electromagnetic stirring, and then the molten steel is cast on a water-cooled copper roller ...

Embodiment 2

[0099] Example 2 - (La, Ce, Nd)-Fe-B / Nd-Fe-B / (Ho, Dy, Pr, Nd)-Fe-B three main phase structure

[0100] Equivalent composition (Ce 0.45 La 0.05 Nd 0.3 PR 0.15 Ho 0.02 Dy 0.03 ) 30 Fe 68.39 B 0.94 tm 0.67 (TM = Ga, Co, Cu, Nb).

[0101] (1) According to mass percentage (La 0.08 Ce 0.75 Nd 0.05 PR 0.12 ) 30 Fe 68.4 B 0.9 tm 0.7 、Nd 30 Fe 68.3 B 1.1 tm 0.6 and (Ho 0.15 Dy 0.25 Nd 0.4 PR 0.2 ) 30 Fe 68.4 B 1 tm 0.6 Prepare raw materials separately.

[0102] (2) Melt the prepared raw materials separately. First put the raw materials into the quick-setting crucible of the intermediate frequency induction melting furnace, and when the vacuum degree reaches 10 -2 When the Pa is above, power on and preheat, and wait until the vacuum degree reaches 10 again. -2 After Pa is above, stop vacuuming and fill high-purity Ar to make the Ar pressure in the furnace reach 0.08Mpa for smelting. After all the raw materials are melted, electromagnetic stirring is used ...

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Abstract

The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a high-corrosion-resistance multi-hard-magnetic-principal-phase Ce permanent magnet and a preparation method thereof. The permanent magnet is prepared through a process that hydrogen absorption and oxygen control are achieved through powder and dehydrogenation is achieved through pre-sintering. The rare earth element with the maximum mass percentage content in the final magnet is Ce. The chemical formula of the permanent magnet is shown, according to the mass percentage, as (Ce,Re)aFe100-a-b-cBbTMc. The permanent magnet is prepared from multiple hard magnetic principle phases including (Pr,La,Ce,Nd)-Fe-B, (Nd,Pr)-Fe-B and (Dy,Ho,Gd,Er)-Fe-B which are different in particle size and magnetocrystalline anisotropy constant k. The chemical formulas of the principle phase are (RL1-x,Cex)a1Fe100-a1-b1-c1Bb1TMc1, (NdyPr1-y)a2Fe100-a2-b2-c2Bb2TMc2 and [RHz, (Nd,Pr)1-z]a3FE100-a3-b3-c3Bb3TMc3 respectively, wherein x is larger than 0.25 and smaller than or equal to 1.0, y is larger than or equal to 1 and smaller than or equal to 1.0, z is larger than 1 and smaller than or equal to 1.0, a is larger than or equal to 27 and smaller than or equal to 31, b is larger than or equal to 0.8 and smaller than or equal to 1.5, c is larger than or equal to 0.5 and smaller than or equal to 2, the value range of a is the same as those of a1, a2 and a3, the value range of b is the same as those of b1, b2 and b3, and the value range of c is the same as those of c1, c2 and c3. Re is selected from rare earth elements. RL contains light rare earth elements. RH contains heavy rare earth elements. TM is one or more of Ga, Co, Cu, Nb and Al. The permanent magnet has the advantages of being high in corrosion resistance and small in weight-loss ratio, and the preparation technology is suitable for engineering large-scale production.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, in particular to a Ce permanent magnet with high corrosion resistance and multiple hard magnetic main phases and a preparation method thereof. Background technique [0002] So far, NdFeB is still the permanent magnet material with the highest performance and is irreplaceable. Nd 2 Fe 14 As an intermetallic compound, B was synthesized by Russian scientists very early. There are many invention patents involving NdFeB. The composition patents mainly belong to the US Naval Laboratory (DLN. Koon), which only covers the United States. The component patents of Hitachi Metals (inherited from Sumitomo Special Metals Corporation, SSMC) and Magnequench (inherited from General Motors, GM) (Dr.J.Croat, etc.) cover Japan, the United States, and Europe. However, since 2002, these patents have expired one after another, and by the end of 2014, all of Hitachi's original patents wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F41/02B22F3/16
Inventor 朱明刚韩瑞李卫宋利伟吴亚平孙亚超俞能君石晓宁
Owner CENT IRON & STEEL RES INST
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