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Fabrication process of samarium-cobalt magnet

A preparation process, the technology of samarium cobalt magnets, applied in the direction of magnetic objects, inductors/transformers/magnets manufacturing, magnetic materials, etc., can solve the problems of large difference in magnetic properties, over-burning or insufficient sintering, poor product consistency, etc.

Active Publication Date: 2019-03-01
HANGZHOU PERMANENT MAGNET GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing sintered samarium cobalt magnets usually use a horizontal vacuum sintering furnace. The sintering process is carried out in a vacuum, and the heating is conducted in the form of heat radiation. The temperature uniformity is poor, and it is easy to cause over-sintering or insufficient sintering. Large, poor product consistency

Method used

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  • Fabrication process of samarium-cobalt magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, the raw materials are in parts by weight: Sm 25.5g; Co 51g; Cu 5.8g; Zr 2.7g; Nb 0.05g;

[0032] Concrete preparation process is as follows:

[0033] 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, and the melting power is increased to melt the raw materials. When all the raw materials are melted and the color of the molten liquid surface changes from orange red to green, continue refining for 2 to 5 minutes to obtain the alloy molten liquid.

[0034] Ingot casting: The melt is poured into a 25mm wide red copper plate condensation mold with 8°C circulating water or chilled water for cooling.

[0035] Powder making: After primary and secondary crushing, the cast ingot enters the jet mill for powder making. The oxygen content in the jet mill is <200ppm, the grinding pressure is 0.4MPa, and the particle size of th...

Embodiment 2

[0039] In this embodiment, the raw materials are in parts by weight: Sm 26g; Co 50.9g; Cu 5.8g; Zr 2.8g; Nb 0.15g;

[0040] Concrete preparation process is as follows:

[0041] 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, and the melting power is increased to melt the raw materials. When all the raw materials are melted and the color of the molten liquid surface changes from orange red to green, continue refining for 2 to 5 minutes to obtain the alloy molten liquid.

[0042] Ingot casting: pour the melt into a 25mm wide red copper plate condensation mold with 15°C circulating water or chilled water for cooling.

[0043] Powder making: After primary and secondary crushing, the cast ingot enters the jet mill for powder making. The oxygen content in the jet mill is <200ppm, the grinding pressure is 0.5MPa, and the particle size of the ob...

Embodiment 3

[0047] In this embodiment, the raw materials are in parts by weight: Sm 26g; Co 50.8g; Cu 5.8g; Zr 3.0g; Nb 0.25g; Fe 15g.

[0048] Concrete preparation process is as follows:

[0049] 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, and the melting power is increased to melt the raw materials. When all the raw materials are melted and the color of the molten liquid surface changes from orange red to green, continue refining for 2 to 5 minutes to obtain the alloy molten liquid.

[0050] Ingot casting: pour the melt into a 25mm wide red copper plate condensation mold with 15°C circulating water or chilled water for cooling.

[0051] Powder making: after primary and secondary crushing, the cast ingot enters the jet mill for powder making. The oxygen content in the jet mill is <200ppm, the grinding pressure is 0.55MPa, and the particle size ...

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Abstract

The invention provides a fabrication process of a samarium-cobalt magnet. The fabrication process comprises the steps of material preparation, alloy smelting, ingot casting, powder preparation, formation, sintering and tempering. Before solid solution is ended, a subsequent sintering process is performed on a formed blank after partial pressure process operation, air cooling is performed to a roomtemperature and then annealing is performed to obtain the product samarium-cobalt magnet after a temperature in a sintering furnace is reduced to 100 DEG C or below. Before the solid solution is ended, the partial pressure process operation is performed on the formed blank, on one hand, the temperature uniformity of the furnace can be improved, the magnetic property uniformity of a sample under the same sintering condition can be relatively good, volatilization of Sm can be suppressed, air holes are eliminated, and the blank density is improved; and on the other hand, harmful gas generated bysintering also can be timely discharged out of the furnace by constantly filling inert gas, the sintering atmosphere is good, and the service lifetime of an instrument can be prolonged.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a preparation process of a samarium cobalt magnet. Background technique [0002] As an important functional material, permanent magnet materials have been widely used in various important fields such as computer technology, micro-communication technology, automobile industry, aviation industry, automation technology, and instrument technology. 2:17 samarium cobalt permanent magnet material has high saturation magnetization, high coercive force, high Curie temperature and good corrosion resistance, making it the best choice for permanent magnet materials in many industries. As the demand for clean energy is becoming more and more urgent, the high-performance permanent magnets required in wind turbines are also receiving more and more attention. In addition, in the aerospace field, high-performance magnets mean weight reduction, so 2: Type 17 samarium cobalt per...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/055C22C1/04
CPCC22C1/0433H01F1/0557H01F41/0253H01F41/0266
Inventor 朱子斌肖涛李红刘海珍陈志鹏冒守栋
Owner HANGZHOU PERMANENT MAGNET GRP
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