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A samarium cobalt material with high knee coercivity and a preparation method thereof

A technology of coercive force and samarium cobalt, applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., to achieve the effects of stabilizing the production process, reducing segregation, and improving anisotropy

Inactive Publication Date: 2019-01-08
HANGZHOU PERMANENT MAGNET GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a high knee point coercive force sintered samarium cobalt permanent magnet material and its preparation method, to overcome the deficiencies of existing sintered samarium cobalt materials

Method used

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  • A samarium cobalt material with high knee coercivity and a preparation method thereof
  • A samarium cobalt material with high knee coercivity and a preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] In this embodiment, the raw materials are calculated in parts by weight, Sm 25.5g; Co 48g; Cu 4.5g; Zr 2.5g; Nb 0.2g; Fe15.6g.

[0026] The specific preparation process is as follows:

[0027] Melting: Put the raw materials into the vacuum melting furnace in the order of Fe-Cu-Co-Zr-Nb-Sm, evacuate to 0.10Pa or below, fill with inert gas to make the vacuum degree -0.06MPa, increase the melting power to melt the raw materials , The raw materials are all melted, and after the refining is continued for 2-10 minutes, the alloy melt is obtained.

[0028] Ingot casting: Pour the molten liquid into a copper plate condensation mold with a width of 25mm and a 15°C circulating water for cooling.

[0029] Pulverizing: After the ingot is first broken and middle broken, it enters the jet mill for pulverization, and the oxygen content in the jet mill <200ppm, the grinding pressure is 0.4MPa, and the particle size of the obtained powder SMD is 5.0μm.

[0030] Molding: Use automatic press moldi...

Embodiment 2

[0033] In this embodiment, the raw materials are calculated in parts by weight, Sm 26g; Co 49g; Cu 5.5g; Zr 2.8g; Nb0.03g; Fe15.6g.

[0034] The specific preparation process is as follows:

[0035] Melting: the raw materials are added to the vacuum melting furnace in the order of Fe-Cu-Co-Zr-Nb-Sm, vacuumed to 0.08Pa or below, filled with inert gas to make the vacuum degree -0.06MPa, increase the melting power to melt the raw materials, All the raw materials are melted, and after the refining is continued for 2-10 minutes, an alloy melt is obtained.

[0036] Ingot casting: Pour the molten liquid into a copper plate condensation mold with a width of 25mm and a 10°C circulating water for cooling.

[0037] Pulverizing: After the ingot is first broken and middle broken, it enters the jet mill for pulverization, and the oxygen content in the jet mill <200ppm, the grinding pressure is 0.5MPa, and the particle size of the obtained powder is 3.4μm.

[0038] Forming: Use full-automatic press fo...

Embodiment 3

[0041] In this embodiment, the raw materials are calculated in parts by weight, Sm 25g; Co51g; Cu 5g; Zr 3.0g; Nb 0.25g; Fe17.5g.

[0042] The specific preparation process is as follows:

[0043] Melting: the raw materials are added to the vacuum melting furnace in the order of Fe-Cu-Co-Zr-Nb-Sm, vacuumed to 0.08Pa or below, filled with inert gas to make the vacuum degree -0.06MPa, increase the melting power to melt the raw materials, All the raw materials are melted, and after the refining is continued for 2-10 minutes, an alloy melt is obtained.

[0044] Ingot casting: Pour the molten liquid into a carbon steel condensation mold with a width of 25mm and a 15°C circulating water for cooling.

[0045] Pulverizing: After the ingot is first broken and middle broken, it enters the jet mill for pulverization, and the oxygen content in the jet mill <200ppm, the grinding pressure is 0.55MPa, and the particle size of the obtained powder is 4.6μm.

[0046] Molding: Use automatic press molding,...

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Abstract

A samarium cobalt material with high knee coercivity is prepare from Sm (24.5-27) phr. Co (48-52) part; Cu (4.5 to 6.5 part); Zr (2.5-3.3) parts; Nb (0.03-0.9) portion; Fe (14.5-17.5) part. The samarium-cobalt magnet of the invention is based on a 2:17 type samarium-cobalt magnet. By adding the Nb element into the existing foundation, the resistance to the rotation or movement of the magnetic domain is increased, the 2:17 type SmCo main phase can be kept stable, and the Nb element can refine the grain size, reduce the grain size and increase the anisotropy and coercivity.

Description

Technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a samarium cobalt material with high knee coercivity and a preparation method thereof. Background technique [0002] Permanent magnetic materials still have the ability to preserve magnetic properties and the ability to resist demagnetization under the action of a reverse magnetic field or high temperature without an external magnetic field. As an important functional material, rare earth permanent magnetic materials play an extremely important role in modern society. In particular, the degree of production, development and application of permanent magnetic materials is one of the signs of modern national economic development. At present, rare earth permanent magnet materials are widely used in various industries such as automobiles, national defense, aerospace, instrumentation, communications, medical equipment, and new energy equipment with their excellent properties. [0...

Claims

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Application Information

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IPC IPC(8): H01F1/055H01F41/02
Inventor 朱子斌肖涛肖维冒守栋刘海珍
Owner HANGZHOU PERMANENT MAGNET GRP
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