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A method for inhibiting high-temperature ordering of high-iron-concentration samarium-cobalt alloys

A concentration and alloy technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems affecting the performance of magnets, not conducive to the promotion of the preparation of Fe concentration magnets, and difficult to obtain, so as to achieve low cost and benefit large scale The effect of scale application

Active Publication Date: 2020-10-27
BEIHANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the research results of Toshiba Corporation as an example, the technology used to prepare high-iron concentration (Fe content subscript u=0.35 or atomic concentration ratio 31at%) samarium cobalt permanent magnet material is the traditional powder metallurgy process, wherein the alloy is prepared by induction melting, the result It shows that even with the precise control of the heat treatment process, it is still difficult to obtain a single-phase 1:7H structure in the main phase of the magnet, and there is always a 2:17R ordered phase, which affects the performance of the magnet
The Ningbo Institute of New Materials, Chinese Academy of Sciences adjusts the magnet composition, which can suppress the existence of the 2:17R ordered phase at a lower Fe concentration (subscript u=0.28, atomic concentration ratio 25%), but it is not conducive to the promotion of magnets with higher Fe concentration

Method used

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  • A method for inhibiting high-temperature ordering of high-iron-concentration samarium-cobalt alloys
  • A method for inhibiting high-temperature ordering of high-iron-concentration samarium-cobalt alloys
  • A method for inhibiting high-temperature ordering of high-iron-concentration samarium-cobalt alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Master alloy preparation

[0032] Sm, Co, Cu, Fe and Zr according to Sm(Co 0.58 Fe 0.34 Cu 0.06 Zr 0.02 ) 7.8 The chemical formula is mixed in proportion, and then placed in the water-cooled copper crucible of the vacuum melting furnace, and the easily burnt Sm is placed at the bottom of the crucible, and the vacuum is evacuated to 2×10 -3 ~5×10 -3 Pa, fill the furnace body with high-purity argon gas, and the vacuum degree in the furnace rises to 0.8×10 5 Stop filling after Pa, repeat smelting for 3 to 4 times under the conditions of working voltage 30V-45V and working current 600A-800A, and cool to obtain alloy ingot.

[0033] 2) Master alloy post-treatment

[0034] Melt rapid quenching: put the alloy ingot into a quartz tube with a 0.5mm wide nozzle, place it in the furnace body and connect it to the spray gun. Vacuum down to 3×10 -3 Pa, then fill in high-purity argon until the pressure of the furnace body is -0.04Pa. Pa, keep a pressure difference of 0.0...

Embodiment 2-4

[0047] The processing step of embodiment 2-4 is identical with embodiment 1, but prepared magnet composition is according to chemical formula Sm(Co 1-u-v- w Fe u Cu v Zr w ) z The u in each are different, and the specific components are shown in Table 1.

[0048] Table 1

[0049]

[0050]

[0051] Through the above examples, it is fully demonstrated that the process of the present invention can suppress the generation of 2:17R ordered phase in samarium cobalt alloy with high iron concentration. According to the results in the literature, when there is a 2:17R ordered phase in the magnet, an incomplete cellular structure will be formed after the magnet is aged, and the coercive force will be rapidly reduced. Using the process of the present invention to process the ingot, 2:17 has been suppressed, indicating the advantages of this process in the preparation of magnets with high Fe concentration.

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Abstract

The invention relates to a method for inhibiting high-iron-concentration samarium-cobalt alloy high-temperature ordering. The method mainly comprises the following steps of mother alloy preparation and mother alloy post-treatment. Melt rapid quenching and high-temperature stable treatment are adopted, and a 1:7 H structure is obtained at a high-iron-concentration samarium cobalt mother alloy mainphase, so that the ordered phase of 2:17 is successfully inhibited. The method can be applied to the preparation process of the high-iron-concentration samarium-cobalt magnet, and is little in consumption for the conventional process and beneficial to large-scale application;

Description

technical field [0001] The invention relates to the technical field of preparation of rare earth permanent magnet materials, in particular to a method for preparing a high iron concentration 2:17 type samarium cobalt permanent magnet material. Background technique [0002] 2:17 samarium cobalt permanent magnet material has been widely used in electronic traveling wave tubes, magnetic bearings, engines, generators and ion thrusters with complex thermal and magnetic environments due to its excellent temperature characteristics. The research on the high iron concentration 2:17 type samarium cobalt permanent magnet material has been involved in the recent journal literature, and the composition is Sm(Co 1-u-v-w Fe u Cu v Zr w ) z For example, it is generally believed that when the iron concentration exceeds 25at% (or subscript u>0.32), the cellular structure of the magnet will be damaged and a complete cellular structure cannot be formed. The existing improvement methods ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/06C22C1/02C22C19/07C22C30/02C22F1/10H01F1/055H01F41/02
Inventor 蒋成保徐成张天丽刘敬华王慧张明王敬东蔡明光
Owner BEIHANG UNIV