KR930010324B1 - Method and apparatus of continuous dynamic joule heating to improve magnetic properties and to avoid annealing embrittlement of ferro magnetic amorphous alloy - Google Patents

Abstract

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Description

Continuous Joule Heat Treatment Method of Ferromagnetic Amorphous Alloy and Its Apparatus

1 is a schematic view for explaining a continuous joule heat treatment method of a ferromagnetic amorphous alloy of the present invention.

2 is a flowchart showing an outline of an embodiment of a linear processing apparatus of the present invention.

Figure 3 is a flowchart showing an outline of one embodiment of the same curve processing apparatus.

4 to 6 are hysteresis loops (B-H) showing magnetization changes of samples 1 and 1a corresponding to changes in magnetic field strengths in the range of ± 0.5 Oe, ± 1 Oe, and ± 2 O, respectively.

7 is a comparison diagram of the hysteresis hand Pc of the magnetization change of Samples 1 and 1a described above.

8 to 10 are hysteresis loops (B-H) showing magnetization changes of samples 2 and 2a corresponding to changes in magnetic field strengths in the range of ± 0.5 Oe, ± 1 Oe, and ± 2 Oe, respectively.

FIG. 11 is a hysteresis loss Pc comparison diagram for magnetization change of Samples 2 and 2a described above. FIG.

* Explanation of symbols for main parts of the drawings

1, 16: Send Rial 2, 3, 4: Roller

6, 20: cold roller 7, 8, 22: solenoid

17, 18: electrode roller 19: insulated roller

Hysteresis loop at sample strength of ± 0.5 Oe for sample 1 (continuous row heat treatment with amorphous amorphous alloy).

Hysteresis loop with magnetic field strength of ± 1 Oe.

Hysteresis loop with magnetic field strength of ± 2 Oe.

a: Hysteresis loop having the magnetic field strength of Sample 1a (in-phase substitute in the kitchen) at ± 0.5 Oe.

a: Hysteresis loop whose magnetic field strength of this sample 1a is ± 0.5 Oe.

a: Hysteresis loop in which the magnetic field strength of the sample 1a is ± 1 Oe.

L1: Hysteresis Hand Curve of Sample 1

L1a: hysteresis hand curve of the sample 1a

2: Hysteresis loop of the sample 2 (nickel-based amorphous alloy material subjected to continuous row heat treatment) with a magnetic field strength of ± 0.5Oe.

2: Hysteresis loop in the magnetic field strength of the same sample 2 as ± 1 Oe.

2: Hysteresis loop in the magnetic field strength of the sample 2 to ± 2 Oe.

2a: Hysteresis loop with a magnetic field strength of ± 2Oe of sample 2a (in-phase substitute in kitchen).

2a: Hysteresis loop with a magnetic field strength of ± 0.5 Oe of the sample 2a.

2a: Hysteresis loop in which the magnetic field strength of the sample 2a is ± 1 Oe.

L2: Hysteresis Hand Curve of Copper Sample 2

L2a: Hysteresis hand curve of the same sample 2a

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to continuous Joule heat treatment of amorphous alloys, and more particularly, to an annealing treatment of amorphous metals, and to a method and apparatus for heat treatment of amorphous metals that directly flow AC or pulse current to the alloy to suppress embrittlement associated with the annealing treatment.

Ferromagnetic amorphous metals are widely used in transformer cores, protective tapes, and magnetic shields. In such applications, amorphous metals are usually formed into elongated ribbons. It is well known that the alloy is formed by rapid cooling in a molten state in order to be amorphous, but it is necessary to perform annealing in order to generate ferromagnetic softening due to the residual stress caused by the rapid cooling. However, it is widely known that even an amorphous alloy involves embrittlement in the annealing treatment, which is a problem in using an amorphous alloy.

Until now, the annealing treatment of amorphous alloys has been based on traditional annealing furnaces. As of September 1981, Seno et al. Proposed a method of dynamic annealing in which an amorphous alloy ribbon is passed through a high heat body in US Pat. No. 4,288,260, and Dove was also applied to a heat block heated by a quartz tube heater in US Pat. A technique for passing amorphous alloy ribbons is disclosed, all of which are external heating and not outside the traditional techniques and require external heating equipment, but are not satisfactory as a contribution to the ferromagnetic softening of amorphous alloys.

The present invention is to solve the problems in the prior art described above, to provide a heat treatment method and apparatus that can significantly improve the magnetic properties, such as enhancement of saturation magnetization of the ferromagnetic amorphous alloy or reduction of coercive force. There is a purpose.

Another object of the present invention is to provide a heat treatment method capable of eliminating embrittlement of an amorphous alloy in an annealing treatment for self-softening.

The present invention also provides a method of heat treatment with a Joule effect by flowing alternating current or pulse current through a long ribbon-shaped amorphous alloy substitute without external heating.

As described above, the present invention moves the substrate of an amorphous alloy having a long ribbon shape along the lengthwise path thereof, and makes contact with the electrodes provided at two locations between the above-described driving paths while driving. The continuous Joule heat treatment method of the ferromagnetic amorphous alloy characterized in that the alternating current or pulse current flows to generate Joule heat in the substitute.

In addition, the apparatus for continuous row heat treatment of the ferromagnetic amorphous alloy is a sending means consisting of a plurality of rollers, sending rails and winding rails, etc. for driving a long ribbon-shaped amorphous alloy along a longitudinal path, a stirring current or a pulse. It is characterized in that it is provided with a current-carrying means which is connected to the current-supply means of electric current and the above-mentioned current supply means, and consists of electrodes which respectively contact the substitute at two places between the above-mentioned driving paths.

The structure of the above-described method and apparatus of the present invention is yet to be achieved by connecting the electrode of the amorphous alloy molded into a long ribbon shape along the lengthwise path with an electrode connected to the electrode to flow a stirring current or a pulse current. Although not elucidated clearly, it is believed that rapid alternating or intermittent heating facilitates the movement of the magnetic walls, which are thought to facilitate stress relief and hinder magnetization and elements.

It is also believed that the flow of alternating current or pulse current can prevent embrittlement associated with annealing in that the rapid heating and cooling avoids the relaxation of the time zone structure of the alloy. You can see a glimpse from the increase.

On the other hand, the method and apparatus of the present invention are expected to generate heat due to the Joule effect (P = 1 ² R) of the current flowing through the alloy while the current flows directly through the substrate of the amorphous alloy, There is an annealing effect of softening.

Further, since the above-described heat treatment in the magnetic field is performed or the inside of the magnetic field is orthogonally passed after the above-described heat treatment, the magnetization direction is matched in the longitudinal direction of the substitute, so that the magnetic field anisotropy is induced in the same direction, thereby exhibiting more ferromagnetic properties.

Hereinafter will be described based on the embodiment of the present invention.

The Joule heat treatment method of the ferromagnetic amorphous alloy of the present invention is shown in the schematic diagram of the first embodiment. In the figure, the substitute 100 of the amorphous alloy moves in the longitudinal direction indicated by the arrow, and moves in the magnetic field generated by energizing from the DC power supply 2 of the solenoid 1 as the excitation means in the same direction along the travel path. Passing. Separately, two points spaced apart from the above-described driving path, in the drawing, between the electrode 3, which is in contact with the surface of the substitute 100 at both ends of the solenoid 1, and between the substitute 100, the alternating current from the power source 4, or Pulse current flows.

FIG. 2 is a medicinal clock diagram illustrating an example of a continuous row heat treatment apparatus of a ferromagnetic amorphous alloy for a straight substitute. The amorphous alloy substitute 100 wound on a long ribbon-shaped rail 1 in a kitchen state is provided with a pair of predetermined pairs on the supply side. The driving roller is pulled slowly in the direction of the arrow in the drawing through the guide rollers (2, 3) at a straight distance of the cutting roller, and is cut or wound to a predetermined length by the cutting device (5) at the end of the driving path. It is recovered by winding on (6) or the like.

The above-mentioned guide rollers 2 and 3 are usually 304 or 314 stainless steel, and the springs 13 are contacted by the pressure rollers 14 and 15 with the substitute 100 interposed therebetween so that the spring 13 imparts the force. Each roller (14, 15) is pressed by the substitute 100 from the top to be pressed. The rollers 2 and 3 are connected to the high current AC power supply 10 or the pulse oscillation device 9, and form an electrode which generates Joule heat periodically or intermittently by flowing a current to the substitute 100 between both contact portions. have.

The driving path of the above-mentioned substitute 100 is also arranged so that two pairs of solenoids 7 and 8 pass back and forth between respective quantum poles or in the axial center, and are connected to the DC power supplies 11 and 12, respectively, so that the magnetic field in the above-described paths. To generate (H, H ₂ ).

3 is an example of a continuous Joule heat treatment apparatus of a ferromagnetic amorphous alloy forming a curved driving path. The amorphous alloy substitute 100 wound around the elongated ribbon 16 in the cooked state is curved in contact with the accompaniment of the outer circumferential surface of the insulated roller 19 rotating on the supply side to recover the shaft by the winding rail 20. Wound from The part of the substitute 100 which curves and runs in contact with the above-mentioned insulation roller 19 is matched by the force which a spring exerts on the outer side of the press roller 17 and 18 of a relative position on the diameter of the roller 19. It comes in contact and is crimped. The insulating roller 19 is preferably a ceramic material, and each of the pressing rollers 17 and 18 is connected to the pulse oscillator 23 or the AC power supply 24 so as to flow a current from the crimped portion to the substitute 100. Therefore, the joule heat is generated periodically or intermittently in the substitute 100.

The master 100 away from the insulated roller 19 is then wound between the two poles of the solenoid 22 connected to the DC power supply 25 and wound around the rail 20 after being treated at the magnetic field H ₃ it occurs.

In addition, if the diameter of the above-described insulation roller 19 and the winding roller 20 to match the average value of the diameter of the Troydal core, it is also said that the process of manufacturing the Troydal core of the diameter can be reduced.

Hereinafter, an embodiment of the joule heat treatment method of the present invention will be described based on test data.

1. Test setup condition of the device

10cm/sec① Travel speed of amorphous alloy substitute (V) 0 <V

10 cm / sec

20 Oe② Magnetic field strength (H) H ₁ , H ₂ , H ₃

20 Oe

③ Heating time (t _h ) t _h = 1 200 sec

④ Heat treatment by pulse current

10³A/㎠Current density (J) J

10 ³ A / ㎠

Pulse duration (t _p ) t _p = 1 to 100 ms

Frequency (f) f = 1 to 10,000 Hz

⑤ Heat treatment by AC

Waveform sin wave, triangle wave, angular wave

Frequency (f) f = 50 50000 Hz

Current density (J) J = 10A / ㎠

2. Example

Fe ₇₈ B ₁₃ Si ₉ amorphous alloy (trade name: A605, USA) was used as sample 1 and iron alloy sample.

Dimensions Length 100cm * Width 0.3cm * Thickness 25㎛ Weight 0.465gr

Travel speed V = 0.3cm / sec

Treatment length 1 = 15cm

Copper Resistance R = 3.0Ω

Pulse condition

Pulse current density J = 5.42 ^* 10 ⁴ A / ㎠

Pulse duration t _p = 271㎛

Pulse frequency f = 9.4 Hz

Processing time t _h = 50 sec

Magnetic field strength H ₁ = 200 Oe

H ₂ = 200 Oe

Magnetization hysteresis loops and a when the magnetic field strength varied in the range of -0.5Oe to + 0.5Oe with respect to the same sample 1a in the cooked state before processing for comparison with the above-described treated sample 1 The magnetization hysteresis loops and a were measured when changing in the range of 1 Oe to +1 Oe and when changing in the range of -2 Oe to + 2Oe. The result is as shown in the data of Table 1, and FIG. 3, FIG. 4, and FIG.

TABLE 1

Subsequently, the hysteresis hand of each of Samples 1 and 1a is the same as L ₁ and L _1a shown in FIG.

In addition, in order to confirm how the samples 1 and 1a were affected by the annealing annealing surface by the Joule heat treatment of the present invention, the above-described samples 1a were subjected to annealing by conventional means, referred to as sample 1b, and both were pulled together and broken. The test was done and the height was measured and compared. As a result, the new device showed ε ₁ = 0.9 to ₁ while the new device showed ε ₁ = 9 ^* 10 ^{-3 to} 5 ^* 10 ^-2 , but the new device showed little improvement in the embrittlement improvement effect of the present invention. It became.

As apparent from the hysteresis loop obtained by the above test, the softening of the magnetic properties of the sample 1 subjected to the Joule heat treatment of the present invention is narrower in the horizontal axis and wider in the vertical axis than the shape of the loop in the hysteresis. It shows a significant improvement in the significant decrease of hands.

Sample 2

Fe ₄₀ Ni ₃₃ Mo ₄ B ₁₆ as a widely used nickel-based ferromagnetic amorphous alloy (Sample 2 prepared by Arid Corporation, trade name 2826MB, was prepared as follows.

Length 100cm ^* Width 0.3cm ^* Thickness 32㎛ Weight 0.584gr

Sample running speed V = 0.2cm / sec

Treatment length l = 15cm

In-phase resistance R = 2.5Ω

AC power

a. Frequency f = 60Hz

b. Waveform sin waveform

c. Current density J = 2.75 ^* 10 ³ A / ㎠

Magnetic field strength H ₁ = 200 Oe

H ₂ = 200 Oe

As a comparative example, the hysteresis loop 2, a when the magnetic field strengths were changed in the ranges of -0.5 to +0.5 Oe, -1 to +1 Oe, and -2 to + 2Oe, respectively, together with the sample 2a of 2826 MB in the cooked state described above. _2, 2, a _2, 2, is to measure a ₂ represents the Table 2, also the seventh, the eighth and ninth Fig also result.

TABLE 2

The hysteresis hand of each of Samples 2 and 2a is the same as L ₂ and L _2a shown in FIG.

In addition, samples 2 and 2a were confirmed to be affected by the annealing quenching surface by the Joule heat treatment of the present invention, and the sample 2a was annealed by a conventional means, referred to as sample 2b, and both were pulled together and broken. The test was done and the height was measured and compared. As a result, the new device showed ε ₁ = 0.9 to ₁ while the new device showed ε ₁ = 7 ^* 10 ^{-3 to} 5 ^* 10 ^-2 , and the new device showed almost no increase in embrittlement. It became.

As is apparent from the hysteresis loop obtained by the above-described test, the softening of the magnetic properties of the sample 2 subjected to the Joule heat treatment of the present invention is smaller than that of the sample 2a in the loop shape, which is narrower in the horizontal axis and wider in the longitudinal axis. It shows a significant improvement in the significant decrease of hands.

As described above, in the present invention, in softening heat treatment of an elongate member of a ferromagnetic amorphous alloy, a pair of electrodes are brought into contact with each other during constant processing of a moving traveling member to continuously flow alternating current or pulse current to the electrode to generate heat. Since it is by the method and apparatus which generate | occur | produce intermittently, the magnetic property of an amorphous alloy is remarkably improved. In other words, the member subjected to continuous Joule heat treatment of the present invention has increased saturation magnetization and reduced coercivity as compared to that of the cooked state, and the hysteresis hand is greatly reduced while the brittleness associated with the annealing treatment can be avoided to some extent as compared with the conventional means. have.

Claims (18)

The long ribbon-shaped amorphous alloy substitute 100 is moved along the path 13 in the longitudinal direction and connected to two electrodes 14 and 15 respectively provided between the driving paths 13 while driving. The alternating current or the pulse current flows through the electrode described above to generate Joule heat in the above-described substitute (100). The continuous joule heat treatment method of a ferromagnetic amorphous alloy according to claim 1, wherein the traveling path (13) is also passed through the magnetic field so that the driving material (100) also passes through the magnetic field. 3. The ferromagnetic amorphous alloy according to claim 1 or 2, wherein the above-described traveling path 13 is further provided with a recovery means at the end to cut or wind the treated material 100 to a predetermined length to recover the ferromagnetic amorphous alloy. Continuous Joules Heat Treatment Method. The method of claim 1, wherein the substrate 100 is run at a speed of 0 to 10 cm / sec. 2. The method of claim 1, wherein the alternating current described above is a frequency of 50 to 5000 Hz. 2. The method of claim 1, wherein the alternating current described above is a frequency of 50 to 5000 Hz. The continuous Joule heat treatment method of a ferromagnetic amorphous alloy according to claim 1, wherein the energization of the above-described substitute is such that the current density is 10 A / cm 2 or more. The continuous Joule heat treatment method of a ferromagnetic amorphous alloy according to claim 1, wherein the pulse current flowing in the above-described material is a pulse high current. The method of claim 8, wherein the pulse current has a pulse current density of 1000 A / cm 2 or more. The method of claim 8, wherein the pulse current described above is a pulse frequency of 1 to 1000 Hz. The continuous Joule heat treatment method of a ferromagnetic amorphous alloy according to claim 2, wherein the strength of the magnetic field described above is 200 Oe or more. The method of claim 1, wherein the above-described substitute is one of an iron-based ferromagnetic amorphous alloy and a nickel-based ferromagnetic amorphous alloy. The method of claim 1, wherein the traveling path of the substitute is a two-way linear contact with the electrode. The method of claim 1, wherein the above-described traveling path of the substitute is an arc-shaped curved path in two places in contact with the electrode. A plurality of rollers 2, 3, 4 or 19, a sending rail 1, 16 and a winding rail 6 for driving the long ribbon-shaped amorphous alloy substrate 100 along the longitudinal path 13 20) and the above-described substitutes connected to the current supply means (9, 24 or 10, 23) of the sending means, alternating current or pulse current, and the above-described traveling path (13) interposed therebetween. And a conducting means comprising electrodes (2, 3, 17, 18) in contact with each other. 16. The ferromagnetic according to claim 15, characterized in that the above-described traveling route includes magnetic means by solenoids 7, 8, 22 and DC power supplies 11, 12, 25, which also form a magnetic field between the electrodes. Continuous Joule Heat Treatment of Amorphous Alloys. The ferromagnetic according to claim 15, wherein the above-described traveling path includes a solenoid 22 and a magnetic means by a DC power supply 25, which form a magnetic field in the longitudinal direction of the substitute after the electrode 18. Continuous Joule Heat Treatment of Amorphous Alloys. 16. The continuous joule of a ferromagnetic amorphous alloy according to claim 15, wherein the roller 19 between the electrodes 17 and 18 is made of an insulator and drives the substitute 100 in a semicircular arc. Heat treatment method.

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