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A preparation process of samarium cobalt magnet

A samarium-cobalt magnet and its preparation technology are applied in the fields of magnetic objects, inductors/transformers/magnets manufacturing, magnetic materials, etc., which can solve the problems of poor performance of samarium-cobalt magnets and low product qualification rate, and achieve the probability of knocking edges and bumping corners The effect of reducing and increasing the temperature transfer rate and suitable sintering atmosphere

Active Publication Date: 2019-01-15
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 present invention proposes a preparation process of a samarium-cobalt magnet, aiming at solving the problems of poor performance and low product qualification rate of existing samarium-cobalt magnets

Method used

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  • A preparation process of samarium cobalt magnet
  • A preparation process of samarium cobalt magnet
  • A preparation 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 25g; Co 48g; Cu 6g; 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 -0.02MPa, 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 red copper plate condensation mold with a width of 25mm that is passed through 8°C circulating water or chilled water for cooling to obtain an ingot.

[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 less than 200ppm, the gri...

Embodiment 2

[0039] In this embodiment, the raw materials are in parts by weight, Sm 25.5g; Co 49.5g; Cu 6.5g; 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 -0.04MPa, 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: the melt is poured into a red copper plate condensation mold with a width of 25mm and cooled by circulating water or chilled water at 10°C to obtain an ingot.

[0043] Powder making: after the primary and secondary crushing of the ingot, it enters the jet mill for powder making. The oxygen content in the jet mill is <200ppm, the grinding pressure ...

Embodiment 3

[0047] In this embodiment, the raw materials are in parts by weight, Sm 25.5g; Co50.8g; Cu 6g; Zr 3.0g; Nb 0.25g; Fe15.45g.

[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: the melt is poured into a red copper plate cooling mold with a width of 25mm that is passed through 15°C circulating water or chilled water for cooling to obtain an ingot.

[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 gri...

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Abstract

The invention provides a preparation process of a samarium-cobalt magnet, comprising the following steps: alloy melting, ingot casting, powder making, molding, sintering and tempering; Wherein, the formed blank obtained by cold isostatic pressing is firstly wrapped with a metal skin and then subjected to a subsequent sintering process, and when the temperature in the sintering furnace is reduced to below 100 DEG C, the air is cooled to normal temperature, the metal skin is removed, and the product is tempered to obtain the product. The green blank obtained in the molding process is firstly wrapped with a metal skin and then sintered, so that the temperature transmission rate is increased, the green blank is heated uniformly, harmful gases outside the sintering furnace can be effectively blocked, and the sintering atmosphere is good; At the same time, the friction and collision between magnets and cartridges can be effectively alleviated by wrapping the blank block with metal sheets. The probability of edge impact and angle impact of magnets is obviously reduced, and the eligibility rate is greatly improved. In addition, the metal skin can be recycled, suitable for industrial applications.

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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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/055C22C1/04
CPCC22C1/0433H01F1/0557H01F41/0253H01F41/0266
Inventor 朱子斌刘海珍李红李晓饶军冒守栋
Owner HANGZHOU PERMANENT MAGNET GRP
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