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Method of production of rare earth magnetic alloy ribbon

A manufacturing method and technology of magnets, which are applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problem of inability to obtain nano-grain structure stably, difficult cooling speed, and inability to stably ensure magnetic properties, etc. question

Inactive Publication Date: 2014-05-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the process of rapid cooling and solidification of the alloy melt, it is difficult to stably obtain a certain cooling rate, so the desired nano-grain structure cannot be stably obtained. If the cooling rate is too high, it will become an amorphous structure, and if the cooling rate is insufficient, it will form Coarse grain structure, due to the generation of their mixed structure, there is a problem that excellent magnetic properties cannot be ensured stably

Method used

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  • Method of production of rare earth magnetic alloy ribbon
  • Method of production of rare earth magnetic alloy ribbon
  • Method of production of rare earth magnetic alloy ribbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Refining Nd by Electric Arc Melting Furnace 14.7 Fe 79.03 B 5.67 Ga 0.3 Cu 0.1 al 0.2 Composed of rare earth magnet alloys, using figure 1 The single-roller quenching and solidification device produced quenching strips (quenching strips) under the conditions in Table 2.

[0046] According to the present invention, after the temperature of the melt reaches a predetermined temperature, the pressure is applied, the pressure is increased to the discharge start pressure, and the pressure is lowered to the discharge continuation pressure at the moment the discharge starts (-50kPa: gauge pressure ＊ ). The other conditions are the same as those of the comparative example.

[0047] ( ＊ Gauge pressure... expressed as the difference from atmospheric pressure (1 atmosphere))

[0048] Table 2

[0049]

[0050] table 3

[0051]

[0052]

[0053] Table 3 summarizes the results of Comparative Example and Example 1.

[0054] In the comparative example, according to t...

Embodiment 2

[0064] Refining Nd by Electric Arc Melting Furnace 14.7 Fe 79.03 B 5.67 Ga 0.3 Cu 0.1 al 0.2 Composed of rare earth magnet alloys, using figure 1 The single-roll quenching and solidifying device produced a quenching strip (quenching strip) under the conditions in Table 4.

[0065] Only one type of silicon nitride is used as the material of the nozzle. According to the present invention, after the melt temperature reaches a predetermined temperature, the pressure is applied, the pressure is increased to the discharge start pressure, and the pressure is lowered to the discharge continuation pressure (-50kPa) at the moment the discharge starts. . Thereafter, according to a preferred embodiment of the present invention, the discharge pressure is gradually increased in a stepwise manner at a rate of 5 kPa / 10 seconds in accordance with the residual amount of melt in the nozzle. The other conditions are the same as in Example 1.

[0066] Figure 4 Regarding Example 1 and Exa...

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Abstract

The present invention provides a method of producing a rare earth magnetic alloy ribbon of a suitable solidified structure which can realize excellent magnetic characteristics by controlling the discharge rate of melt to the roll surface in rapid solidification using a rotary roll. The method of producing a rare earth magnetic alloy ribbon by rapid solidification using a rotary roll comprising: a step of preparing a rare earth magnetic alloy melt inside of a nozzle which faces said rotary roll, a step of applying a discharge pressure to said rare earth magnetic alloy melt in said nozzle, and a step of causing the discharge pressure to fall from a value at the time of start of discharge to a value which is required for sustained discharge at the instant that said rare earth magnetic alloy melt starts to be discharged from said nozzle. Preferably, the discharge pressure which is loaded on the melt surface inside the nozzle is made to increase from the sustained discharge pressure in accordance with the decrease in the amount of melt in the nozzle.

Description

technical field [0001] The present invention relates to a method of producing thin strips of rare earth magnet alloys by rapid solidification using rotating rolls. Background technique [0002] made of neodymium magnets (Nd 2 Fe 14 The rare earth magnet represented by B) has a high magnetic flux density and is used in various applications as an extremely strong permanent magnet. In order to obtain excellent magnetic properties, it is necessary to stably secure a fine structure composed of nano-sized crystal grains. For this purpose, for example, as disclosed in Patent Document 1, the following method has been performed: a single-roll method in which an alloy melt having a composition of a rare-earth magnet is discharged from a nozzle to a rotating roll surface as a cooling medium, etc. Rapid cooling and solidification form thin bands (quenched bands). [0003] However, in the process of rapid cooling and solidification of the alloy melt, it is difficult to stably obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F1/0571
Inventor 佐久间纪次岸本秀史野崎美纪也
Owner TOYOTA JIDOSHA KK