An amorphous alloy ribbon and a method of manufacturing the same

Abstract

The application provides an amorphous alloy strip and a preparation method thereof, the amorphous alloy strip has a width of greater than or equal to 80 mm, a thickness of greater than or equal to 30 microns, and a toughness value of less than 4.0, the amorphous alloy strip is obtained by cooling an alloy liquid through a cooling roller, the cooling roller comprises a roller sleeve, the thermal conductivity of the roller sleeve, the maximum available thickness of the roller sleeve and the thickness of the amorphous alloy strip have the following relationship: the requirements for the cooling capacity of the cooling roller in the preparation of the strip are achieved through the optimized cooperation among the thickness of the strip, the thermal conductivity of the roller sleeve and the maximum available thickness of the roller sleeve, so that the strip with a width of greater than or equal to 80 mm and a thickness of greater than or equal to 30 microns is prepared.

Description

Technical Field

[0001] This invention belongs to the field of alloy preparation technology, and specifically relates to an amorphous alloy strip and its preparation method. Background Technology

[0002] Amorphous alloys are a type of soft magnetic material that has developed rapidly in recent years. Compared with traditional soft magnetic materials such as electrical steel and ferrite, they have higher permeability and lower AC loss, and have been widely used in the cores of magnetic components such as transformers, inductors, current transformers, and motor stators.

[0003] Amorphous alloy strips are generally manufactured using planar flow technology. The method involves melting raw materials in a specific ratio into a molten alloy in a smelting furnace. This molten alloy is then poured into a nozzle package containing slit nozzles at the bottom. The molten alloy flows out of the nozzles and spreads onto the outer circumference of a high-speed rotating copper alloy cooling roller below the nozzles, forming a molten pool of a certain size between the cooling roller surface and the nozzle bottom surface. The molten alloy is rapidly extracted and cooled, while molten alloy from the nozzle slits continuously replenishes the molten pool, thus forming a continuous thin strip with an amorphous structure. The strip adheres tightly to the outer surface of the cooling roller as it rotates at high speed, and is peeled off at appropriate locations on the outer circumference of the cooling roller by high-pressure gas or mechanical means. Finally, a winding device winds the strip into a roll.

[0004] In the manufacturing process of amorphous ribbons, rapid solidification of the alloy liquid is a necessary condition for the resulting ribbon to possess an amorphous structure. For amorphous ribbons commonly used in existing technologies, the alloy liquid at its glass transition temperature T... g The cooling rate must reach 10 when solid amorphous ribbon is formed nearby. 5 The temperature at which amorphous ribbon is peeled from the surface of the cooling roller (peeling temperature) should be below approximately 200°C. Furthermore, different amorphous materials have different requirements for cooling rates. If the actual cooling rate of the alloy liquid or the ribbon does not meet the requirements, the ribbon will experience structural relaxation or even crystallization due to insufficient cooling, leading to severe embrittlement and significantly deterioration of its properties.

[0005] In the manufacturing process of amorphous ribbon, the rapid solidification of the molten alloy and the cooling of the ribbon are completed on the outer surface of the cooling roller. The cooling roller is generally assembled concentrically from two parts: an annular cooling roller sleeve and a cylindrical roller core. An annular channel is formed between the sleeve and the core, through which high-speed flowing cooling water is introduced. During the manufacturing process, the heat contained in the molten alloy must sequentially pass through the molten pool, the interface between the molten alloy and the outer surface of the sleeve, the sleeve of a certain thickness, and the interface between the inner surface of the sleeve and the cooling water, ultimately being transferred to the flowing cooling water. The thermal conductivity of the cooling roller sleeve largely determines the cooling capacity of the cooling system, thus playing a decisive role in the formation of the amorphous ribbon. To achieve rapid solidification of the molten alloy, existing technologies generally use copper alloys with high thermal conductivity as the cooling roller sleeve material, such as chromium-zirconium copper, beryllium bronze, and nickel-silicon bronze.

[0006] Among amorphous alloy strips, iron-based amorphous strips have the widest application range. Their main advantages are low cost and high saturation magnetic induction intensity, making them suitable for use in the cores of various transformer components. Current technology can generally manufacture iron-based amorphous strips with a thickness of about 25 micrometers and a width of 100-300 mm.

[0007] With technological advancements and intensified market competition in the transformer industry, there is an urgent need for thick iron-based amorphous alloy strips (thickness greater than 30μm and width greater than 80mm). For example, using thick strips in the manufacture of transformer cores will reduce the workload of core processing and improve production efficiency; it can also reduce fragmentation caused by strip breakage, which is beneficial to improving the reliability of components.

[0008] However, the stable production of thick and wide iron-based amorphous alloy strips has always been a challenge. Nickel-based or cobalt-based amorphous alloys have lower critical cooling rates, making it relatively easy to manufacture thick strips; for example, existing technologies can already produce nickel-based amorphous alloy brazing foils with thicknesses exceeding 50 micrometers. However, iron-based amorphous alloys have higher critical cooling rates than nickel-based amorphous alloys. When manufacturing wide iron-based amorphous alloy strips with thicknesses exceeding 30 μm, the heat contained in the thicker strip is significantly increased compared to thinner strips, resulting in a significantly greater thermal load on the cooling rollers. The cooling capacity of the cooling rollers used in existing technologies is insufficient to ensure that the cooling rate of the alloy liquid and strip exceeds their critical cooling rate, leading to significant embrittlement and even significant crystallization of the manufactured strip. Therefore, it is difficult to stably manufacture thick and wide iron-based amorphous alloy strips. No relevant solutions have been proposed in existing technologies.

[0009] For example, Chinese patents CN107442750B and CN204486736U, and Japanese patent JP3280778B2 have proposed methods for manufacturing amorphous alloy thick strips using multiple nozzles. These methods involve simultaneously expelling molten alloy from multiple adjacent nozzles, allowing the molten alloy or solidified strip material from each nozzle to combine into a thick strip. However, the key technology for manufacturing amorphous alloy thick strips lies not in how to form the thick strip, but in ensuring that the equipment has sufficient cooling capacity during the manufacturing process to allow the material to form an amorphous structure.

[0010] US Patent 4537239 discloses a cooling roller for manufacturing amorphous ribbons, made of beryllium copper alloy, with a diameter of approximately 380 mm and a roller sleeve thickness of approximately 6.35 mm. Because the diameter of this roller sleeve is too small, the ribbon's contact time with the roller surface is very short. Therefore, the roller sleeve thickness must be very thin to ensure its cooling capacity, making it impossible to stably manufacture amorphous alloy wide ribbons with a thickness greater than 26 micrometers.

[0011] Chinese invention patent application CN110976794A discloses a method for manufacturing iron-based amorphous alloy strips. By improving the cooling capacity of the cooling system, iron-based amorphous strips with a thickness of up to 40 micrometers can be achieved. It also suggests that the cooling capacity of the roller sleeve can be improved by reducing its thickness from over 30 mm to 20 mm. However, the cooling capacity of the roller sleeve is not only related to its thickness but, more importantly, to its thermal conductivity. This application does not mention the thermal conductivity of the roller sleeve used, thus lacking practical guidance for selecting cooling roller sleeve parameters.

[0012] Non-patent literature (Guo Qian, Yan Mi. Numerical simulation of temperature field of cooling roller in flat plate casting process, Rare Metals Materials and Engineering, 2015, Vol. 44, No. 8, 2048-2052) simulated the temperature field of cooling roller in the manufacturing process of amorphous alloy strip. Using a copper alloy with a thermal conductivity of 180 W / m·K as the cooling roller material, the optimal dimensions for the cooling roller in manufacturing iron-based amorphous strip with a thickness of 30 μm and a width of 220 mm were obtained: roller sleeve thickness of 10 mm and roller sleeve diameter of 1200 mm. However, this literature did not propose a cooling roller sleeve selection scheme for wide amorphous alloy strips with a thickness greater than 30 μm.

[0013] In summary, existing technologies offer some technical solutions for manufacturing amorphous alloy thick strips in terms of amorphous material composition and thick strip formation processes. However, they do not provide any guarantee measures for the core issue of thick strip manufacturing—the cooling rate of the alloy liquid and the strip. Even though some existing technologies have made attempts to improve cooling capacity, they have not provided a method for manufacturing amorphous alloy thick strips with a width of more than 80 mm, a thickness of more than 30 μm, and good toughness. Summary of the Invention

[0014] To address the aforementioned problems, this invention provides an amorphous alloy strip and its preparation method. By coordinating the strip thickness, the thermal conductivity of the roller sleeve, and the available thickness of the roller sleeve, the cooling rate of the cooling roller on the alloy liquid during strip preparation is achieved, thereby producing a strip with a width ≥ 80 mm and a thickness ≥ 30 μm.

[0015] To achieve the above objectives, the present invention adopts the following technical solution:

[0016] An amorphous alloy strip, wherein the amorphous alloy strip has a width ≥ 80 mm, a thickness ≥ 30 μm, and a toughness value < 4.0.

[0017] Preferably, the amorphous alloy strip comprises the following composition: any one or more of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Cu, Ag, Au, Zn, Al, or Sn with a total content of 0-20 at%; any one or more of Si, B, P, or C with a total content of 15-30 at%; one or two of Co or Ni with a total content of 0-20 at%; and the balance being Fe.

[0018] Preferably, the amorphous alloy strip is obtained by cooling a molten alloy through a cooling roller, the cooling roller comprising a roller sleeve, and the thermal conductivity of the roller sleeve, the maximum usable thickness of the roller sleeve, and the thickness of the amorphous alloy strip have the following relationship:

[0019]

[0020] Where: λ is the thermal conductivity of the roller sleeve, in W / m·K;

[0021] d max This represents the maximum usable thickness of the roller sleeve, in mm.

[0022] δ represents the average thickness of the amorphous alloy strip, in μm.

[0023] The value of k ranges from 1 to 2 mm. 3 The optimal value of K / W can be determined by combining the properties of the amorphous alloy strip, the width of the amorphous alloy strip, and process parameters, including alloy liquid temperature, surface linear velocity of the cooling roller, roller nozzle spacing, alloy liquid pressure at the nozzle, molten pool protection parameters, and cooling water flow rate and temperature.

[0024] A method for preparing an amorphous alloy strip, wherein the amorphous alloy strip is prepared by a planar flow rapid solidification process, the method comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling.

[0025] Preferably, the temperature of the alloy liquid is 1250-1450℃; the linear velocity of the surface of the cooling roller is 15-30m / s, and the temperature of the surface of the cooling roller is 70-150℃; the temperature at which the amorphous alloy strip is peeled off the surface of the cooling roller is 120-200℃; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 20-60kPa, and the width of the nozzle slit is 0.4-1.0mm.

[0026] Preferably, the temperature of the alloy liquid is 1300-1400℃.

[0027] Preferably, the static pressure at which the molten alloy is sprayed onto the surface of the cooling roller is 25-50 kPa.

[0028] Preferably, the surface temperature of the cooling roller is 90-120°C.

[0029] Preferably, the temperature at which the amorphous alloy strip is peeled off the surface of the cooling roller is 140-180°C.

[0030] Preferably, the value of λ is 80-350 W / m·K; the value of d max The value is 4-20mm.

[0031] Preferably, the d max The value of λ is 4-20 mm; the value of λ is 100-300 W / m·K.

[0032] In the iron-based amorphous alloy of this invention, Fe is the most important element providing ferromagnetism to the material. Compared with Co or Ni, Fe has the highest atomic magnetic moment, thus enabling the alloy to have the highest saturation magnetic induction intensity among all amorphous alloys. To obtain certain special properties, such as increased induced magnetic anisotropy, Fe can be partially replaced by Co and / or Ni, but the substitution ratio should not exceed 20 at%, otherwise the saturation magnetic induction intensity of the material will be significantly reduced.

[0033] In the iron-based amorphous alloy of the present invention, small amounts of any one or more of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Cu, Ag, Au, Zn, Al, or Sn may be added. The purpose of this addition includes improving the alloy's thermal stability, corrosion resistance, or mechanical properties, or enabling the alloy to form a nanocrystalline structure during subsequent heat treatment. The total amount of these elements added should not exceed 20 at%, otherwise the saturation magnetic induction of the material will be significantly reduced.

[0034] In the iron-based amorphous alloy of this invention, Si, B, P, and C are essential elements for the formation of an amorphous structure during rapid solidification; they are also called amorphizing elements or glass-forming elements. To obtain better amorphous forming ability, two or more of these elements should be added simultaneously. The total content of these elements is between 15-30 at%, and excessively high or low content will reduce the amorphous forming ability of the alloy.

[0035] The beneficial effects of this invention are as follows: The thickness and width of the strip determine the thermal load borne by the roller sleeve. To achieve a sufficiently high cooling rate under these conditions, the thermal conductivity and thickness of the roller sleeve must be rationally selected. Therefore, the strip thickness, roller sleeve thermal conductivity, and maximum usable thickness of the roller sleeve are mutually constrained and influenced. An optimal range of these three variables is necessary to achieve stable manufacturing of thick, wide, amorphous iron-based strips. This invention provides a method for manufacturing thick, wide, amorphous iron-based strips with a thickness of 30 micrometers or more and a width of 80 mm or more. Based on the specific requirements of different compositions and specifications of the iron-based amorphous strips for cooling capacity, strip performance, and production costs, the material and thickness of the roller sleeve are rationally selected. This ensures that the roller sleeve possesses comprehensive characteristics such as satisfactory thermal conductivity, good thermal fatigue resistance, good roller sleeve performance consistency, and low manufacturing cost. The thick, wide, amorphous iron-based strips manufactured using this roller sleeve can guarantee satisfactory electromagnetic properties while also achieving good consistency and low cost.

[0036] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 The diagram shows the relationship between the thermal conductivity of the roller sleeve, the maximum usable thickness of the roller sleeve, and the thickness of the strip. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 171 mm and a thickness of 32 μm; the alloy composition of the amorphous alloy strip is Fe. 78 Si9B 13 (The subscript numbers 78, 9, 13, etc. represent the mole percentage of the corresponding element).

[0042] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling. The amorphous alloy strip has a width of 171 mm and a thickness of 32 μm; the temperature of the alloy liquid is 1370 °C; the linear velocity of the surface of the cooling roller is 22 m / s, and the surface temperature of the cooling roller is 70 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 120 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 35 kPa; the nozzle slit width is 0.8 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 104 W / m·K, a thickness of 5.0 mm, an inner diameter of 600 mm, and a material of Cu-Be alloy.

[0043] Example 2:

[0044] The process and conditions in this embodiment are the same as in Embodiment 1, except that the roller sleeve thickness is 3.2 mm, the strip width is 213 mm, and the thickness is 32 μm.

[0045] Example 3:

[0046] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 143 mm and a thickness of 38 μm; the alloy composition of the amorphous alloy strip is Fe. 78 Si9B 13 (The subscript numbers 78, 9, 13, etc. represent the mole percentage of the corresponding element).

[0047] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 143 mm and a thickness of 38 μm; the temperature of the alloy liquid is 1390 °C; the linear velocity of the surface of the cooling roller is 20 m / s, and the temperature of the surface of the cooling roller is 150 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 200 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 45 kPa; the width of the nozzle slit is 0.6 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 346 W / m·K, a thickness of 17.0 mm, and an inner diameter of 1200 mm.

[0048] Example 4:

[0049] The process and conditions in this embodiment are the same as those in Embodiment 3, except that the roller sleeve thickness is 11.8 mm, the strip width is 142 mm, and the thickness is 38 μm.

[0050] Example 5:

[0051] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 143 mm and a thickness of 38 μm; the alloy composition of the amorphous alloy strip is Fe. 82 Si4B 13 C1 (where the subscript number indicates the mole percentage of the corresponding element. The same applies below).

[0052] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 85 mm and a thickness of 48 μm; the temperature of the alloy liquid is 1380 °C; the linear velocity of the surface of the cooling roller is 21 m / s, and the surface temperature of the cooling roller is 80 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 130 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 55 kPa; the nozzle slit width is 0.7 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 82 W / m·K, a thickness of 48.0 mm, and an inner diameter of 600 mm.

[0053] Example 6:

[0054] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 100 mm and a thickness of 41 μm; the alloy composition of the amorphous alloy strip is Fe. 83 Si3B 11C1P2 (where the subscript number indicates the molar percentage of the corresponding element).

[0055] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 100 mm and a thickness of 41 μm; the temperature of the alloy liquid is 1365 °C; the linear velocity of the surface of the cooling roller is 22 m / s, and the surface temperature of the cooling roller is 90 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 140 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 52 kPa; the nozzle slit width is 0.7 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 180 W / m·K, a roller sleeve thickness of 7.5 mm, and an inner diameter of 600 mm.

[0056] Example 7:

[0057] The process and conditions in this embodiment are the same as those in Embodiment 6, except that the roller sleeve thickness is 4.5 mm, the strip width is 284 mm, and the thickness is 41 μm.

[0058] Example 8:

[0059] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 85 mm and a thickness of 49 μm; the alloy composition of the amorphous alloy strip is Fe. 60 Co 18 Ta2Si8B 12 (Where the subscript number indicates the molar percentage of the corresponding element).

[0060] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 85 mm and a thickness of 49 μm; the temperature of the alloy liquid is 1360 °C; the linear velocity of the surface of the cooling roller is 20 m / s, and the surface temperature of the cooling roller is 100 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 160 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 55 kPa; the nozzle slit width is 0.7 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 200 W / m·K, a roller sleeve thickness of 11.2 mm, and an inner diameter of 1600 mm.

[0061] Example 9:

[0062] The process and conditions in this embodiment are the same as those in Embodiment 8, except that the roller sleeve thickness is 5.7 mm, the strip width is 85 mm, and the thickness is 49 μm.

[0063] Comparative Example 1:

[0064] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 170 mm and a thickness of 32 μm; the alloy composition of the amorphous alloy strip is Fe. 82 Si4B 13 C1 (where the subscript number indicates the mole percentage of the corresponding element).

[0065] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 170 mm and a thickness of 32 μm; the temperature of the alloy liquid is 1380 °C; the linear velocity of the surface of the cooling roller is 20 m / s, and the surface temperature of the cooling roller is 70 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 120 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 45 kPa; the nozzle slit width is 0.6 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 104 W / m·K, a roller sleeve thickness of 6.5 mm, and an inner diameter of 600 mm.

[0066] Comparative Example 2:

[0067] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 143 mm and a thickness of 31 μm; the alloy composition of the amorphous alloy strip is Fe. 82 Si4B 13 C1 (where the numbers represent mole percentages. The same applies below).

[0068] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 143 mm and a thickness of 31 μm; the temperature of the alloy liquid is 1380 °C; the linear velocity of the surface of the cooling roller is 21 m / s, and the surface temperature of the cooling roller is 70 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 120 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 55 kPa; the nozzle slit width is 0.7 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 346 W / m·K, a roller sleeve thickness of 22.8 mm, and an inner diameter of 1200 mm.

[0069] Comparative Example 3:

[0070] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 100 mm and a thickness of 41 μm; the alloy composition of the amorphous alloy strip is Fe. 83 Si3B 11 C1P2 (where the numbers represent mole percentages. The same applies below).

[0071] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 100 mm and a thickness of 41 μm; the temperature of the alloy liquid is 1365 °C; the linear velocity of the surface of the cooling roller is 22 m / s, and the surface temperature of the cooling roller is 70 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 120 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 52 kPa; the nozzle slit width is 0.7 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 180 W / m·K, a roller sleeve thickness of 11 mm, and an inner diameter of 800 mm.

[0072] Comparative Example 4:

[0073] An amorphous alloy strip, wherein the amorphous alloy strip has a width of 85 mm and a thickness of 49 μm; the alloy composition of the amorphous alloy strip is Fe. 83 Si3B 11 C1P2.

[0074] A method for preparing an amorphous alloy strip, wherein the method employs a planar flow rapid solidification process to prepare the amorphous alloy strip, the process comprising heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of a cooling roller for cooling; the amorphous alloy strip has a width of 85 mm and a thickness of 49 μm; the temperature of the alloy liquid is 1365 °C; the linear velocity of the surface of the cooling roller is 21 m / s, and the surface temperature of the cooling roller is 70 °C; the temperature at which the amorphous alloy strip peels off the surface of the cooling roller is 120 °C; the static pressure of spraying the alloy liquid onto the surface of the cooling roller is 46 kPa; the nozzle slit width is 0.6 mm; the cooling roller includes a roller sleeve with a thermal conductivity of 220 W / m·K, a roller sleeve thickness of 13.6 mm, and an inner diameter of 1600 mm.

[0075] To verify the technical effect of the present invention, cooling roller sleeves with different combinations of key parameters such as thermal conductivity, thickness, and inner diameter were designed. For comparison, roller sleeve parameters that do not conform to the scope of the present invention were also tested as comparative examples. The process parameters for Examples 1 to 9 and Comparative Examples 1 to 4 are shown in Table 1. The measurement data for the cooling roller sleeve parameters, average strip thickness, toughness value, lamination factor, and magnetic properties used in each example and comparative example are shown in Table 2. The strip width, thickness, lamination factor, and magnetic properties were measured using the method of national standard GB / T 19345.1-2017; the strip toughness value was measured using the method of International Electrotechnical Commission standard IEC 60404-8-11.

[0076] Table 1. Process parameters used in manufacturing strip.

[0077]

[0078]

[0079]

[0080] Table 2. Parameters of Cooling Roller Sleeve and Measurement Data of Strip Performance

[0081]

[0082]

[0083]

[0084] It can be seen that when the technical solution given in this invention is adopted (i.e., the thermal conductivity of the roller sleeve is close to the thickness of the roller sleeve), Figure 1 When the iron-based amorphous alloy thick strip is manufactured within the shaded area (as shown in the image), it exhibits good toughness, a stacking factor ≥0.86, and a saturation magnetic induction intensity B. s ≥1.50T, coercivity H c ≤2.0A / m, specific total loss P c (50Hz, 1.3T) ≤0.15W / kg, which can achieve the purpose of this invention; but without adopting the technical solution of this invention (i.e., the thermal conductivity of the roller sleeve is close to the thickness of the roller sleeve). Figure 1 When the iron-based amorphous thick strip is above the shaded area in the image, the toughness of the fabricated strip deteriorates significantly.

[0085] When manufacturing thick, wide, amorphous iron-based strips with a thickness of 30 μm or more and a width of 80 mm or more, the maximum usable thickness of the cooling roller sleeve is closely related to its thermal conductivity. When a high thermal conductivity material is used for the roller sleeve, the maximum thickness can be appropriately increased; conversely, when a low thermal conductivity material is used, the maximum thickness must be reduced, otherwise the strip will become brittle or even crystallize due to insufficient cooling. According to the present invention, when the thermal conductivity of the roller sleeve material is increased from 80 W / m·K to 350 W / m·K, the maximum usable thickness of the roller sleeve can be increased from 5 mm to 18 mm.

[0086] When manufacturing thick iron-based amorphous strips with a thickness of over 30 μm and a width of over 80 mm, the relationship between the maximum usable thickness of the roller sleeve and the thermal conductivity of the roller sleeve can be intuitively seen as follows: Figure 1 The line segment AB is shown in the diagram. Line segment AB has two meanings: First, if the thermal conductivity of the roller sleeve is determined in advance, the maximum usable thickness of the roller sleeve must be below the maximum usable thickness value corresponding to that thermal conductivity on line segment AB; otherwise, its cooling capacity cannot be guaranteed. Second, if the maximum thickness of the roller sleeve is determined in advance, the thermal conductivity of the roller sleeve material must be above the thermal conductivity value corresponding to that maximum thickness on line segment AB; otherwise, its cooling capacity cannot be guaranteed. In other words, line segment AB actually provides the upper limit of the maximum usable thickness of the roller sleeve when the thermal conductivity is constant, and the lower limit of the thermal conductivity of the roller sleeve when the maximum thickness is constant.

[0087] Given a fixed thermal conductivity of the roller sleeve, the maximum usable thickness of the roller sleeve is also related to the thickness of the manufactured strip. The thicker the manufactured strip, the greater the thermal load on the roller sleeve, necessitating a further reduction in the maximum roller sleeve thickness. Similarly, with a fixed maximum roller sleeve thickness, the thermal conductivity of the roller sleeve material must be further increased when manufacturing thicker strips. Thus, under different strip thicknesses, the optimal range for the "roller sleeve thermal conductivity - maximum usable roller sleeve thickness" will be within the range of... Figure 1 Below the line segment AB in the diagram.

[0088] Therefore, when manufacturing iron-based amorphous wide and thick strips with a thickness of 30μm or more and a width of 80mm or more, the optimal range of thermal conductivity of the roller sleeve and its actual usable thickness range are located in the adjacent area. Figure 1 Within the shaded area of ​​polygon ABCD, the coordinates of each point are A(80, 4), B(350, 20), C(80, 2), and D(350, 2).

[0089] The diameter of the cooling roller sleeve is mainly selected based on the process equipment conditions. Although the diameter of the cooling roller does have some influence on the cooling capacity of the cooling roller system, its influence is relatively small compared to the thermal conductivity and thickness of the sleeve. According to the present invention, a suitable range for the inner diameter of the sleeve is 400-1600 mm. More preferably, the optimal range for the inner diameter of the sleeve is 500-1200 mm.

[0090] Since the roller sleeve is a consumable material, it needs to be machined after each strip production to remove the surface thermal fatigue layer. Therefore, the actual thickness of the roller sleeve gradually decreases throughout its service life. When the roller sleeve thickness decreases to a certain extent, a new roller sleeve must be replaced. To reduce production costs, it is always desirable for the initial thickness of the new roller sleeve to be as large as possible. However, according to the present invention, the determination of the maximum thickness of the roller sleeve must also take into account the guarantee of cooling capacity. Therefore, in actual production, the initial thickness of the roller sleeve can be determined in two ways: one is to directly limit the initial thickness of the new roller sleeve to within the maximum usable thickness, so that the new roller sleeve can be directly used to manufacture iron-based amorphous wide and thick strips. The other is to intentionally make the initial thickness of the new roller sleeve exceed the maximum usable thickness for manufacturing iron-based amorphous wide and thick strips. When the actual thickness of the roller sleeve is greater than the maximum usable thickness, it is only used to manufacture thinner amorphous strips or amorphous strips with lower cooling rate requirements; when the roller sleeve thickness is consumed to below the maximum usable thickness for manufacturing iron-based amorphous wide and thick strips, then the manufacturing of iron-based amorphous wide and thick strips can begin. In other words, when purchasing or manufacturing a new roller sleeve, the initial thickness of the roller sleeve can be limited to below the maximum usable thickness, or the initial thickness of the new roller sleeve can be greater than the maximum usable thickness.

[0091] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An amorphous alloy strip, characterized in that, The amorphous alloy strip has a width ≥ 80 mm, a thickness ≥ 30 μm, and a toughness value < 4.0; The amorphous alloy strip is obtained by cooling a liquid alloy through a cooling roller. The cooling roller includes a roller sleeve, and the thermal conductivity of the roller sleeve, the maximum usable thickness of the roller sleeve, and the thickness of the amorphous alloy strip have the following relationship: Where: λ is the thermal conductivity of the roller sleeve, in W / m·K; d max This represents the maximum usable thickness of the roller sleeve, in mm. δ represents the average thickness of the amorphous alloy strip, in μm. The value of k ranges from 1 to 2 mm. 3 K / W; The value of λ is 80~350 W / m·K; the value of d max The value is 4~20mm; The composition of the amorphous alloy strip, by atomic percentage, is: Fe 78 Si9B 13 Fe 82 Si4B 13 C1, Fe 83 Si3B 11 C1P2 or Fe 60 Co 18 Ta2Si8B 12 One of them; The temperature of the alloy liquid is 1250~1450℃; the linear speed of the surface of the cooling roller is 15~30m / s, and the temperature of the surface of the cooling roller is 70~150℃; The temperature at which the amorphous alloy strip is peeled off the surface of the cooling roller is 120~200℃; the static pressure at which the alloy liquid is sprayed onto the surface of the cooling roller is 20~60 kPa, and the width of the nozzle slit is 0.4~1.0 mm.

2. A method for preparing an amorphous alloy strip according to claim 1, characterized in that, The amorphous alloy strip is obtained by cooling with an alloy liquid cooling roller, which includes heating and melting the raw material of the amorphous alloy strip into an alloy liquid, and then spraying the alloy liquid onto the surface of the cooling roller for cooling.

3. The method for preparing amorphous alloy strip according to claim 2, characterized in that, The temperature of the alloy liquid is 1300~1400℃.

4. The method for preparing amorphous alloy strip according to claim 2, characterized in that, The static pressure of spraying the molten alloy onto the surface of the cooling roller is 25~50 kPa.

5. The method for preparing amorphous alloy strip according to claim 2, characterized in that, The surface temperature of the cooling roller is 90~120℃.

6. The method for preparing amorphous alloy strip according to claim 2, characterized in that, The temperature at which the amorphous alloy strip is peeled off the surface of the cooling roller is 140~180℃.

7. The method for preparing amorphous alloy strip according to claim 2, characterized in that, The d max The value of λ is 4~20mm; the value of λ is 100~300W / m·K.

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