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Rare earth cobalt permanent magnet, method and device for manufacturing same

A technology of rare earth cobalt permanent magnets and rare earth elements, which is applied in the direction of magnets, inductors/transformers/magnets, magnetic objects, etc., can solve problems such as motors, and achieve low coercive force, high squareness ratio, and high residual flux effect of density

Pending Publication Date: 2021-08-03
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the technology disclosed in International Patent Publication No. WO2009 / 145229, the residual magnetization value is 80% or more in a magnetic field of 10 kOe, so it is not considered that the motor can satisfactorily perform high torque operation

Method used

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  • Rare earth cobalt permanent magnet, method and device for manufacturing same
  • Rare earth cobalt permanent magnet, method and device for manufacturing same
  • Rare earth cobalt permanent magnet, method and device for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128]

[0129] By using a high frequency furnace, at 1 x 10 -2 Torr or below 1×10 -2 A base alloy containing 20% ​​by mass of Fe and 80% by mass of Zr and components containing various elements were melted in a Torr vacuum to obtain a composition of 25.0% by mass of Sm, 4.0% by mass of Cu, 21.0% by mass of Fe, 2.2 Alloy ingot of mass % Zr and balance Co.

[0130] Next, the obtained alloy ingot was heat-treated at 1170° C. for 15 hours, and then the heat-treated alloy ingot was coarsely pulverized and then finely pulverized into a powder having an average diameter of about 6 μm by using a jet mill in an inert gas. Next, by 1.0 ton / cm in a magnetic field of 15kOe 2 The powder was pressed with a pressure of , and a molded body having a length of 100 mm, a width of 50 mm, and a height of 50 mm was molded by using a mold.

[0131] At a temperature of 1200 °C, the obtained molded body was prepared in 1 × 10 -2 Torr or below 1×10 -2 Sintering was carried out in Torr vacuum. ...

Embodiment 2

[0133]

[0134] A permanent magnet according to Example 2 was obtained in the same manner as in Example 1 except that the time of heating and holding at a temperature of 800° C. in the isothermal aging treatment was changed to 5 hours.

Embodiment 3

[0145]

[0146] Except for the amount of raw materials added, a molded body of an alloy ingot having a composition of 21.55% by mass of Fe, 25.65% by mass of Sm, 4.5% by mass of Cu, and 2.20% by mass of Zr was obtained in the same manner as in Example 1. and Co as the balance.

[0147] At a temperature of 1210 °C, the obtained molded body was prepared in 1 × 10 -2 Torr or below 1×10 -2 Sinter in Torr vacuum for one hour. Next, the sintered body was subjected to solution treatment at 1155° C. for 15 hours, and immediately thereafter the sintered body was cooled at a cooling rate of 100° C. / min. The rapidly cooled sintered body was subjected to isothermal aging by heating it in an inert gas atmosphere and maintaining it at a temperature of 750 °C for two hours. Then, the sintered body was gradually cooled to 400°C at a cooling rate of 2°C / min. In addition, the sintered body was subjected to isothermal aging treatment by heating and maintaining at a temperature of 765° C. f...

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Abstract

Provided are a rare earth cobalt permanent magnet having excellent magnetic characteristics, a method and device for manufacturing such a rare earth cobalt permanent magnet. The rare earth cobalt permanent magnet is composed of 23 to 27 mass% of R, 1.0 to 5.0 mass% of Cu, 18 to 25 mass% of Fe, 1.5 to 3.0 mass% of Zr, and Co as the remainder and unavoidable impurities. R represents a rare earth element including at least Sm; the rare earth cobalt permanent magnet includes a plurality of crystal grains and a grain boundary portion; and in the grain boundary portion, the concentration of Cu is at least twice the concentration of Zr.

Description

technical field [0001] The present disclosure relates to a rare earth cobalt permanent magnet applicable to a variable field motor, a method and a device for manufacturing the rare earth cobalt permanent magnet. Background technique [0002] Variable field motors have gained attention due to their ability to reduce the energy consumed by the motor. In a variable field motor, its magnetic flux varies according to the number of revolutions per unit time (eg, RPM). Generally, for a variable field motor, it is required to generate high magnetic flux when high torque is required at low speed, and reduce the magnetic flux when the motor rotates at high speed, so that the motor has high energy efficiency in a wide range from low speed to high speed. [0003] Examples of methods of changing magnetic flux in a variable field motor include a variable magnetic force method, a field coil method, and a winding switching method. For example, Japanese Patent No. 4965924 discloses a metho...

Claims

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Application Information

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IPC IPC(8): H01F1/055H01F41/02
CPCH01F1/0557H01F41/0266H01F7/021
Inventor 幕田裕和町田浩明藤原照彦金森悠
Owner TOKIN CORP
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