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Preparation method of sintered samarium-cobalt magnet

A samarium cobalt and system technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve problems such as cost, uniformity, safety hazard scheduling, etc., and achieve good overall particle size consistency, good fluidity, and overall uniformity control Good results

Inactive Publication Date: 2019-05-03
CHENGDU GALAXY MAGNETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the problems of cost, uniformity, safety hazards, scheduling and other problems in the process of preparing samarium cobalt magnet powder raw materials by ball milling in the prior art, and to provide a method for preparing sintered samarium cobalt magnets

Method used

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  • Preparation method of sintered samarium-cobalt magnet
  • Preparation method of sintered samarium-cobalt magnet
  • Preparation method of sintered samarium-cobalt magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 200 kg of smelted 2:17 samarium-cobalt alloy ingots were crushed into alloy particles with a particle size of less than 2mm by a crusher. Add 0.5wt% organic solvent and mix well. With high purity N 2 Protective atmosphere and carrier gas are carried out, and the samarium-cobalt alloy particles are put into the jet mill equipment, under high-speed N 2 Under the blowing of the airflow, the powder particles collide with each other and break, and then pass through the high-speed rotating classification wheel to remove the coarse particles with a particle size above 10 μm, and then pass through the cyclone separator to remove the fine particles with a particle size below 2 μm, and obtain an average particle size of 2 to 10 μm of powder particles. During the entire jet milling process, the oxygen content is controlled at 100-300ppm. The powder particles were oriented in a magnetic field of 1.5T, and pre-pressed with a pressure of 12 MPa to obtain a samarium-cobalt powder b...

Embodiment 2

[0047] 200 kg of smelted 2:17 samarium-cobalt alloy ingots were crushed into alloy particles with a particle size of less than 2mm by a crusher. Add 0.05wt% organic solvent and mix well. With high purity N 2 Protective atmosphere and carrier gas are carried out, and the samarium-cobalt alloy particles are put into the jet mill equipment, and the 2 Under the blowing of the airflow, the powder particles collide with each other and break, and then pass through the high-speed rotating classification wheel to remove the coarse particles with a particle size above 10 μm, and then pass through the cyclone separator to remove the fine particles with a particle size below 2 μm, and obtain an average particle size of 2 to 10 μm of powder particles. During the entire jet milling process, the oxygen content is controlled at 100-300ppm. The powder particles were oriented in a magnetic field of 1.5T, and pre-pressed with a pressure of 12 MPa to obtain a samarium-cobalt powder block, and ...

Embodiment 3

[0049] 200 kg of smelted 2:17 samarium-cobalt alloy ingots were crushed into alloy particles with a particle size of less than 2mm by a crusher. Add 1wt% organic solvent and mix well. With high purity N 2 Protective atmosphere and carrier gas are carried out, and the samarium-cobalt alloy particles are put into the jet mill equipment, and the 2 Under the blowing of the airflow, the powder particles collide with each other and break, and then pass through the high-speed rotating classification wheel to remove the coarse particles with a particle size above 10 μm, and then pass through the cyclone separator to remove the fine particles with a particle size below 2 μm, and obtain an average particle size of 2 to 10 μm of powder particles. During the entire jet milling process, the oxygen content is controlled at 100-300ppm. The powder particles were oriented in a magnetic field of 1.5T, and pre-pressed with a pressure of 12 MPa to obtain a samarium-cobalt powder block, and the...

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Abstract

The invention discloses a preparation method of a sintered samarium-cobalt magnet. The preparation method comprises the following steps: 1 crushing sintered samarium-cobalt alloy ingot to obtain samarium-cobalt alloy particles; 2, feeding the samarium-cobalt alloy particles in jet mill equipment protected by nitrogen, enabling the powder particle to collide with each other under blowing of nitrogen airflow; and adopting a grading wheel to screen the crushed samarium-cobalt alloy powder to remove coarse particles, and then adopting a cyclone separator to remove fine particles through screeningto obtain samarium-cobalt alloy powder with the averaged particle size being 2-10 microns; and 3, carrying out orientation and prepressing forming on the samarium-cobalt alloy powder in a magnetic field, then, carrying out isostatic pressing forming, and finally carrying out sintering forming at 1170-1199 DEG C to obtain the sintered samarium-cobalt magnet. According to the preparation method, thepowder preparation cost is low, the flammable solvent is not used, the potential safety hazard is avoided, the samarium-cobalt alloy powder is excellent in uniformity, the sintered magnet is easy tocontrol, the magnetic property of the product is steadier and better, and the product with various high properties or special property requirements can be prepared.

Description

technical field [0001] The invention relates to a magnet material processing technology, in particular to a preparation method of a samarium cobalt magnet, which belongs to the technical field of magnetic materials. Background technique [0002] Samarium Cobalt magnets include SmCo 5 、Sm 2 co 17 Special rare earth magnets are widely used in aviation, aerospace, military electronics, automobiles, sensors, petrochemical, magnetic transmission and other fields. Samarium cobalt magnets have outstanding features such as high magnetic energy product, high coercive force, high remanence, extremely low temperature coefficient (-0.030% / °C), and high operating temperature (maximum operating temperature is 550°C). The temperature stability and chemical stability of samarium cobalt magnets are far higher than those of neodymium iron boron magnets, and they can be better used in various harsh environments. [0003] The existing sintered 2:17 Sm-Co magnets are mainly prepared by powde...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C19/07H01F1/055B22F9/04
Inventor 包小涛王晓松朱玲旭冯进
Owner CHENGDU GALAXY MAGNETAB
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