Samarium - cobalt magnetic powder and preparation thereof

A magnetic powder and powder technology, which is applied in the field of anisotropic samarium-cobalt magnetic powder and its preparation, can solve the problems that do not involve the chemical composition of SmCo magnetic powder SmCo magnetic powder, etc., and achieve the effect of no component segregation, uniform particle size and high proportion

Active Publication Date: 2009-07-08
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent does not involve the preparation process of SmCo mag

Method used

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  • Samarium - cobalt magnetic powder and preparation thereof
  • Samarium - cobalt magnetic powder and preparation thereof
  • Samarium - cobalt magnetic powder and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the composition of Sm: 24wt%, Cu: 6wt%, Fe: 16wt%, Zr: 4wt%, Co: 50wt%, put the prepared raw materials into the alumina crucible, and evacuate to less than 8×10 -3 Pa, fill in an appropriate amount of inert protective gas, melt the alloy by induction heating, and then cast the alloy liquid on a rotating water-cooled copper roller at a certain speed to prepare a 0.3mm thick samarium cobalt cast sheet.

[0036] Heat-treat the cast sheet, vacuum pretreatment at 700°C for 100 minutes; then under the protection of argon, undergo solution treatment at 1150°C for 300 minutes and then cool to room temperature; then keep the product at 810°C for 15 hours, and then cool to 400°C. Keep warm for 10 hours and cool to room temperature.

[0037] Coarsely crush the heat-treated cast pieces into 3-5mm particles, and then hydrogen-explode into powder. Hydrogen absorption process: at 100-300°C, hydrogen pressure>0.1pa, hydrogen absorption 1-3h; dehydrogenation process: heatin...

Embodiment 2

[0041] The raw materials are formulated as follows: Sm: 26.5wt%, Cu: 6.2wt%, Fe: 14wt%, Zr: 3.4wt%, Ni: 0.1wt% Co: 49.8wt%. The purity of each element is 99.9%. Add the prepared raw materials into the crucible, and evacuate to less than 8×10 -3 Pa, fill in an appropriate amount of inert protective gas, melt the alloy by induction heating, and then cast the alloy liquid on the rotating water-cooled plate at a certain speed to form an ingot with a thickness of 8mm.

[0042] The ingot is heat-treated and vacuum pretreated at 1000°C for 30 minutes; then it is solution treated at 1150°C for 200 minutes under the protection of argon and then cooled to room temperature; then the product is kept at 830°C for 8 hours, and then cooled to 350°C. Keep warm for 8 hours and cool to room temperature.

[0043] After the heat treatment, the samarium cobalt ingot is coarsely crushed into 3-5mm particles, and then ball milled and jet milled to obtain a powder with a particle size of 50-200 μm ...

Embodiment 3

[0046] The raw materials are formulated as follows: Sm: 23.0wt%, Cu: 7.2wt%, Fe: 16wt%, Zr: 3.5w%, Ti: 0.5wt%, Co: 49.8wt%. The purity of each element is 99.9%. Add the prepared raw materials into the alumina crucible, and evacuate to less than 8×10 -3 Pa, fill in an appropriate amount of inert protective gas, melt the alloy by induction heating, and then cast the alloy liquid on a rotating water-cooled copper roller at a certain speed to prepare a 0.1mm thick samarium cobalt cast sheet.

[0047] Heat-treat the cast piece, vacuum pretreatment at 800°C for 120 minutes; then, under the protection of argon, undergo solution treatment at 1170°C for 60 minutes and then cool to room temperature; then keep the product at 820°C for 9 hours, and then cool to 450°C. Keep warm for 12 hours and cool to room temperature.

[0048] After the heat treatment, the samarium cobalt ingot is roughly crushed into 3-5mm particles, and then ball milled and jet milled to obtain 60% of the total weig...

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Abstract

The invention discloses anisotropic samarium-cobalt magnetic powder and a preparation method thereof. The magnetic powder crystal is of mainly columnar crystal type; and the width of the columnar crystal is 1 to 30 Mums, the length thereof is 1 to 200 Mums, and the volume thereof is larger than 80%. The percentage of powder with a magnetic powder particle size between 50 to 200 Mums is larger than 60%; the particle sizes of the magnetic powder are well-distributed; the proportion of the columnar crystal is high; and the oxygen content is low. Therefore, an anisotropic samarium-cobalt magnet with high performance is suitable for preparation.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and relates to an anisotropic samarium-cobalt magnetic powder and a preparation method thereof. Background technique [0002] As we all know, SmCo magnets are widely used in industry and modern technology because of their high Curie temperature, low temperature coefficient and good temperature stability, and their operating temperature is generally -30-350°C. With the development of science and technology, higher requirements are put forward for the use temperature of permanent magnet materials. At present, rare earth permanent magnet materials with a temperature of 400-500°C are required in national defense and military industries. The samarium-cobalt magnetic powder used in the magnet puts forward higher requirements. [0003] The magnetic properties of SmCo magnets are closely related to the structure and particle size of magnetic powder. For an anisotropic permanent magn...

Claims

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Application Information

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IPC IPC(8): H01F1/053H01F1/06B22F9/02
Inventor 袁永强于敦波李扩社胡权霞李红卫李世鹏
Owner GRIREM ADVANCED MATERIALS CO LTD
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