WO2020010795A1 - Laser heat treatment method for amorphous alloy strip - Google Patents

Abstract

Disclosed by the present invention is a laser heat treatment method for an amorphous alloy strip, comprising the following operational steps: step 1): connecting two ends of a strip to a first backrolling shaft and a second backrolling shaft respectively; step 2): providing a laser heat treatment device between the first backrolling shaft and the second backrolling shaft so as to perform laser heat treatment on the strip, wherein the laser heat treatment device has a laser wavelength range of 200 nm-1500 nm, a laser output power of 1 w-1 kw and a laser spot diameter of 10mm-300mm, the laser is a continuous laser beam or a pulsed laser beam having a pulse width of 30 ns or more, and the moving speed of the strip is 1 mm/min-800 mm/min; and step 3) winding the heat-treated strip into an iron core. Therefore, the method may effectively eliminate the stress generated during the preparation of the strip, retain a certain free volume, improve the toughness of the strip, improve the production efficiency, and reduce the production cost.

Description

Laser heat treatment method for amorphous alloy strip

This application claims priority from a Chinese patent application filed on July 10, 2018 with the Chinese Patent Office, application number 201810751392.3, and the invention name "A method for laser heat treatment of an amorphous alloy strip", the entire contents of which are incorporated by reference In this application.

Technical field

The invention relates to the technical field of amorphous alloys, in particular to a laser heat treatment method for amorphous alloy strips.

Background technique

Amorphous metals and alloys are an emerging material that came out in the 1970s. The common method for preparing amorphous strips is single-roll quenching. The upper and lower surfaces of the strips have different cooling environments. One side is a cooling roller and the other The side is air, so there are internal stresses in the prepared strip due to the difference in cooling rate. Before use, the stress must be reduced or eliminated through a heat treatment process to increase the magnetic permeability of the magnetic material before it can be used normally.

The conventional heat treatment method is to heat the strip to about 400 ° C in a heating furnace, and the atoms are displaced at high temperatures to eliminate internal stress. However, this traditional annealing method eliminates stress and causes amorphous strips due to atom movement. The free volume in the medium is reduced, and the strip material changes from a tough state to a brittle state. The brittleness of the strip not only affects the difficulty of subsequent processing and transportation, but also causes noise and a hidden danger of transformer short circuit during use.

Therefore, how to eliminate the stress generated during the preparation of the strip, and can retain a certain free volume, improve the toughness of the strip, reduce the difficulty in subsequent processing, improve production efficiency, and reduce production costs are urgently needed by those skilled in the art. Solved technical problems.

Summary of the invention

In view of this, the object of the present invention is to provide a laser heat treatment method for an amorphous alloy strip, which can effectively eliminate the stress generated during the preparation of the strip, and can retain a certain free volume, improve the toughness of the strip, and reduce Difficulty in subsequent processing, improve production efficiency and reduce production costs.

To achieve the above objective, the present invention provides the following technical solutions:

A laser heat treatment method for an amorphous alloy strip is characterized in that it includes the following operation steps:

Step 1): Connect the two ends of the strip to the first and second rewinding shafts, respectively;

Step 2): A laser heat treatment device is provided between the first rewinding shaft and the second rewinding shaft to perform laser heat treatment on the strip, wherein the laser wavelength range of the laser heat treatment device is 200nm-1500nm, The laser output power is 1w-1kw, the laser spot diameter is 10mm-300mm, the laser is a continuous laser beam or a pulse laser beam with a pulse width greater than or equal to 30ns, and the moving speed of the strip is 1mm / min-800mm / min;

Step 3): The heat-treated strip is wound into an iron core.

Preferably, the strip is a cobalt-based amorphous alloy, and the continuous laser beam is used to irradiate the cobalt-based amorphous alloy for heat treatment, the laser output power is 1W-50W, and the laser wavelength is 300nm-1090nm. The moving speed of the strip is 100mm / min-500mm / min.

Preferably, the strip is a cobalt-based amorphous alloy, and the pulsed laser beam is used to irradiate the cobalt-based amorphous alloy for heat treatment, the laser output power is 1W-100W, and the laser wavelength is 300nm-1090nm. The pulse width is 10ns-800ns, and the moving speed of the strip is 200mm / min-600mm / min.

Preferably, the strip is an iron-based amorphous alloy, and the continuous laser beam is used to irradiate the iron-based amorphous alloy for heat treatment, the laser output power is 1W-50W, and the laser wavelength is 300nm-1090nm. The moving speed of the strip is 200mm / min-800mm / min.

Preferably, the strip is an iron-based amorphous alloy, and the pulsed laser beam is used to irradiate the iron-based amorphous alloy for heat treatment, the laser output power is 1W-10W, and the laser wavelength is 300nm-1090nm. The pulse width is 100ns-1000ns, and the moving speed of the strip is 100mm / min-700mm / min.

Preferably, the strip is an iron-based nanocrystalline alloy, and the pulsed laser beam is used to irradiate the iron-based nanocrystalline alloy for heat treatment, the laser output power is 10W-30W, and the laser wavelength is 300nm-1090nm. The pulse width is 1ns-500ns, and the moving speed of the strip is 300mm / min-800mm / min.

The laser heat treatment method for an amorphous alloy strip disclosed in the present invention includes the following operation steps: Step 1): connecting both ends of the strip to a first rewinding shaft and a second rewinding shaft, respectively; step 2): A laser heat treatment device is provided between the rewinding shaft and the second rewinding shaft to perform laser heat treatment on the strip. The laser heat treatment device has a laser wavelength range of 200nm-1500nm, a laser output power of 1w-1kw, and a laser spot of 10mm. -30mm, the laser is a continuous laser beam or pulsed light with a pulse width greater than or equal to 30ns, and the moving speed of the strip is 1mm / min-800mm / min; 3) the heat-treated strip is wound into an iron core. Within the parameter setting range of the above laser heat treatment device, the strip in the area irradiated with the laser beam can be quickly heated to a temperature at which atoms can be moved. During the irradiation of the laser beam, the stress generated by the cooling rate during the preparation process is eliminated by thermal movement of the atoms during the laser beam irradiation. When the strip is moved out of the laser beam irradiation area, it will quickly cool down, and the entire annealing process is completed in a short time. Therefore, the laser heat treatment method of this amorphous alloy strip can not only effectively eliminate the stress generated during the strip preparation process, Moreover, it can retain a certain free volume, improve the toughness of the strip, reduce the difficulty in subsequent processing, improve production efficiency, and reduce production costs.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. It is obvious that the drawings in the following description are merely It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without paying creative labor.

FIG. 1 is a schematic flowchart of a laser heat treatment method for an amorphous alloy strip disclosed in an embodiment of the present invention.

detailed description

In view of this, the core of the present invention is to provide a laser heat treatment method for an amorphous alloy strip, which can effectively eliminate the stress generated during the preparation of the strip, and can retain a certain free volume, improve the toughness of the strip, and reduce Difficulty in subsequent processing, improve production efficiency and reduce production costs.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The laser heat treatment method for an amorphous alloy strip disclosed in the embodiments of the present invention includes the following operation steps: Step 1): Connect both ends of the strip to the first and second rewinding shafts respectively; Step 2): A laser heat treatment device is provided between the first reel and the second reel to perform laser heat treatment on the strip. The laser heat treatment device has a laser wavelength range of 200nm-1500nm, a laser output power of 1w-1kw, and a laser spot diameter of 10mm-300mm, the laser is a continuous laser beam or a pulse beam with a pulse width greater than or equal to 30ns, and the strip moving speed is 1mm / min-800mm / min; 3) the heat-treated strip is wound into an iron core. Within the parameter setting range of the above laser heat treatment device, the strip in the area irradiated with the laser beam can be quickly heated to a temperature at which atoms can be moved. During the irradiation of the laser beam, the stress generated by the cooling rate during the preparation process is eliminated by thermal movement of the atoms during laser beam irradiation When the strip is moved out of the laser beam irradiation area, it will quickly cool down, and the entire annealing process is completed in a short time. Therefore, the laser heat treatment method of this amorphous alloy strip can not only effectively eliminate the stress generated during the strip preparation process, Moreover, it can retain a certain free volume, improve the toughness of the strip, reduce the difficulty in subsequent processing, improve production efficiency, and reduce production costs.

The strip can be a cobalt-based amorphous alloy, an iron-based amorphous alloy, or an iron-based nanocrystalline alloy or other types of amorphous alloys. Different alloys are obtained by setting different parameters of the laser heat treatment device. Strip properties are different.

Detailed description will be given below through specific embodiments.

The strip material disclosed in the first embodiment of the present invention is a cobalt-based amorphous alloy. A continuous laser beam is irradiated to the cobalt-based amorphous alloy for heat treatment. The laser power of the laser heat treatment device is set to 1W-50W, and the laser wavelength is set to 300nm-1090nm. The moving speed of the strip is set to 100mm / min-500mm / min. After the laser heat treatment device is set according to the above parameters, the iron core made by the laser heat treatment method and the iron core made by the conventional heat treatment method are tested (test conditions 50kHz) The performance comparison after 400mT) is as follows:

Heat treatment W / Kg Coercive force A / m Magnetic permeability Rectangle ratio conventional 35.9 4.2 70000 95% laser 34.2 3.5 75000 98%

From the above performance comparison, it can be seen that the performance of the cobalt-based amorphous alloy core obtained by the laser heat treatment method is superior to that of the cobalt-based amorphous alloy core obtained by the conventional heat treatment method.

The strip material disclosed in the second embodiment of the present invention is a cobalt-based amorphous alloy. The pulsed laser beam is used to irradiate the cobalt-based amorphous alloy for heat treatment. The laser power is 1W-100W, the laser wavelength is 300nm-1090nm, and the laser pulse width is 10ns. -800ns, strip moving speed is 200mm / min-600mm / min, after setting the laser heat treatment device according to the above parameters, the iron core obtained by laser heat treatment method and iron core test made by conventional heat treatment method (test conditions The performance comparison after 50kHz, 400mT) is as follows:

Heat treatment W / Kg Coercive force A / m Magnetic permeability Rectangle ratio conventional 35.9 4.2 70000 95% laser 34.5 3.7 85000 96%

From the above performance comparison, it can be seen that the performance of the cobalt-based amorphous alloy core obtained by the laser heat treatment method is superior to that of the cobalt-based amorphous alloy core obtained by the conventional heat treatment method.

The strip disclosed in the third embodiment of the present invention is an iron-based amorphous alloy. The strip is irradiated with a continuous laser beam for heat treatment. The laser power is 1W-50W, the laser wavelength is 300nm-1090nm, and the moving speed of the strip is 200mm / min. -800mm / min, after setting the laser heat treatment device according to the above parameters, the performance comparison between the iron core produced by the laser heat treatment method and the iron core made by the conventional heat treatment method (test conditions 50kHz, 1300mT) is as follows:

Heat treatment W / Kg Excitation W / Kg Coercive force A / m conventional 0.2 0.3 4.2 laser 0.17 0.25 3.5

From the above performance comparison, it can be seen that the performance of the iron-based amorphous alloy core obtained by the laser heat treatment method is superior to that of the iron-based amorphous alloy core obtained by the conventional heat treatment method.

The strip material disclosed in the fourth embodiment of the present invention is an iron-based amorphous alloy. The pulsed laser beam is used to irradiate the iron-based amorphous alloy for heat treatment. The laser power is 1W-10W, the laser wavelength is 300nm-1090nm, and the laser pulse width is 100ns. -1000ns, strip moving speed is 100mm / min-700mm / min, after setting the laser heat treatment device according to the above parameters, the iron core obtained by the laser heat treatment method and the iron core test made by the conventional heat treatment method (test conditions The performance comparison after 50kHz, 1300mT) is as follows:

Heat treatment W / Kg Excitation W / Kg Coercive force A / m conventional 0.2 0.3 4.2 laser 0.16 0.23 3.4

From the above performance comparison, it can be seen that the performance of the iron-based amorphous alloy core obtained by the laser heat treatment method is superior to that of the iron-based amorphous alloy core obtained by the conventional heat treatment method.

The strip material disclosed in the fifth embodiment of the present invention is an iron-based nanocrystalline alloy. The pulsed laser beam is used to irradiate the iron-based nanocrystalline alloy. The laser power is 10W-30W, the laser wavelength is 300nm-1090nm, and the laser pulse width is 1ns-500ns. The moving speed of the strip is 300mm / min-800mm / min. After setting the laser heat treatment device according to the above parameters, the iron core obtained by the laser heat treatment method and the conventional heat treatment method are used to obtain the iron core and test (test conditions 100kHz, The performance comparison after 100mT) is as follows:

Heat treatment W / Kg Magnetic permeability Coercive force A / m conventional 12.5 29000 2.5 Laser fast 9.8 31000 1.8

From the above performance comparison, it can be seen that the performance of the iron-based nanocrystalline alloy core prepared by the laser heat treatment method is superior to that of the iron-based nanocrystalline alloy core obtained by the conventional heat treatment method.

The present invention only lists the above types of amorphous alloys, but is not limited to the above types of amorphous alloys, as long as the amorphous alloy cores made by using the above parameter ranges are all within the protection scope of the present application.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts between the embodiments, refer to each other.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but shall conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

A laser heat treatment method for an amorphous alloy strip is characterized in that it includes the following operation steps: Step 1): Connect the two ends of the strip to the first and second rewinding shafts, respectively; Step 2): A laser heat treatment device is provided between the first rewinding shaft and the second rewinding shaft to perform laser heat treatment on the strip, wherein the laser wavelength range of the laser heat treatment device is 200nm-1500nm, The laser output power is 1w-1kw, the laser spot diameter is 10mm-300mm, the laser is a continuous laser beam or a pulse laser beam with a pulse width greater than or equal to 30ns, and the moving speed of the strip is 1mm / min-800mm / min; Step 3): The heat-treated strip is wound into an iron core. The method for laser heat treatment of an amorphous alloy strip according to claim 1, wherein the strip is a cobalt-based amorphous alloy, and the continuous laser beam is irradiated to the cobalt-based amorphous alloy for heat treatment, so that The laser output power is 1W-50W, the laser wavelength is 300nm-1090nm, and the moving speed of the strip is 100mm / min-500mm / min. The laser heat treatment method for an amorphous alloy strip according to claim 1, wherein the strip is a cobalt-based amorphous alloy, and the pulsed laser beam is used to irradiate the cobalt-based amorphous alloy for heat treatment. The laser output power is 1W-100W, the laser wavelength is 300nm-1090nm, the pulse width is 10ns-800ns, and the moving speed of the strip is 200mm / min-600mm / min. The laser heat treatment method for an amorphous alloy strip according to claim 1, wherein the strip is an iron-based amorphous alloy, and the continuous laser beam is irradiated to the iron-based amorphous alloy for heat treatment, so that The laser output power is 1W-50W, the laser wavelength is 300nm-1090nm, and the moving speed of the strip is 200mm / min-800mm / min. The laser heat treatment method for an amorphous alloy strip according to claim 1, wherein the strip is an iron-based amorphous alloy, and the pulsed laser beam is used to irradiate the iron-based amorphous alloy for heat treatment. The laser output power is 1W-10W, the laser wavelength is 300nm-1090nm, the pulse width is 100ns-1000ns, and the moving speed of the strip is 100mm / min-700mm / min. The laser heat treatment method for an amorphous alloy strip according to claim 1, wherein the strip is an iron-based nanocrystalline alloy, and the pulsed laser beam is used to irradiate the iron-based nanocrystalline alloy for heat treatment. The laser output rate is 10W-30W, the laser wavelength is 300nm-1090nm, the pulse width is 1ns-500ns, and the moving speed of the strip is 300mm / min-800mm / min.

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