A method for preparing an amorphous alloy strip powder

Abstract

The application provides a preparation method of amorphous alloy strip powder, and relates to the technical field of soft magnetic material preparation. The preparation method comprises the following steps: taking amorphous strip and performing preliminary mechanical crushing to obtain amorphous strip fragments with uniform sizes; performing hydrogen absorption treatment on the amorphous strip fragments at 150 DEG C to 300 DEG C to obtain hydrogen absorption amorphous strip, wherein the hydrogen pressure during the hydrogen absorption treatment is 0.3 MPa to 2.0 MPa; performing airflow mill treatment on the hydrogen absorption amorphous strip to obtain amorphous strip particles; performing dehydrogenation and deactivation treatment on the amorphous strip particles, and heating to 180 DEG C to 360 DEG C at a heating rate of 0 to 10 DEG C / min and keeping the temperature for 0 to 300 min; repeating S2 to S4 to obtain tough amorphous; and performing crushing treatment on the tough amorphous to obtain amorphous alloy strip powder.

Description

Technical Field

[0001] This invention relates to the field of soft magnetic material preparation technology, and more specifically, to a method for preparing amorphous alloy strip powder. Background Technology

[0002] Compared to traditional metallic and ferrite soft magnetic materials, soft magnetic composite powder cores possess significant advantages such as high saturation magnetic induction, high resistivity, and low loss, playing an indispensable role in cutting-edge fields such as intelligent manufacturing, high-end communications, and new energy. However, with the continuous increase in miniaturization and high-frequency requirements for electronic devices, traditional iron-silicon, iron-silicon-aluminum, and iron-nickel powder cores are no longer sufficient to meet the actual needs of industry development. Amorphous magnetic powder cores have emerged to address this need. Their core material, amorphous alloy powder, exhibits low hysteresis loss, low coercivity, low loss characteristics at high frequencies, high permeability and resistivity, and high saturation magnetic induction due to its long-range disordered structure, high surface activity, uniform composition, and excellent mechanical and functional properties. It has broad application prospects in multiple fields such as catalysis, battery anodes, composite material reinforcing phases, metal injection molding, 3D printing, and thermal spraying. Among related technologies, the preparation technology of amorphous raw powder faces significant challenges: the molten mechanical crushing method is carried out at high temperatures, which consumes a lot of energy and has low production efficiency. The crushing process is coarse and it is difficult to accurately control the particle size distribution and crystallization degree, which easily introduces external impurities to contaminate the powder; the low-melting-point metal melting method is prone to introducing dopants during the preparation process, and the residues are difficult to completely remove, affecting the purity of the powder; although the high-energy ball milling method can directly prepare amorphous powder, it has the problems of high fine powder content and difficulty in controlling particle size distribution. The local high temperature generated by violent collisions during ball milling causes severe oxidation and cold welding. For alloys that are initially crystalline, long-term high-energy treatment is required to destroy the crystal structure, which further increases the complexity of the process and the risk of contamination. Summary of the Invention

[0003] The present invention aims to solve the problem of difficulty in controlling particle size distribution and crystallization degree during the preparation of amorphous raw powder.

[0004] To address the above problems, this invention provides a method for preparing amorphous alloy strip powder.

[0005] This invention provides a method for preparing amorphous alloy strip powder, comprising the following steps: S1: Take amorphous ribbon and perform preliminary mechanical crushing to obtain amorphous ribbon fragments with uniform size; S2: The amorphous ribbon fragments are subjected to hydrogen absorption treatment at 150℃ to 300℃ to obtain hydrogen-absorbing amorphous ribbon, wherein the hydrogen pressure during the hydrogen absorption treatment is 0.3 MPa to 2.0 MPa; S3: The hydrogen-absorbing amorphous ribbon is subjected to air jet milling to obtain amorphous ribbon particles; S4: Dehydrogenation and deactivation treatment is performed on the amorphous ribbon particles by heating to 180℃ to 360℃ at a heating rate of 0 to 10℃ / min and holding for 0 to 300 min. S5: Repeat S2 to S4 to obtain tough amorphous state; S6: The tough amorphous material is pulverized to obtain amorphous alloy strip powder.

[0006] Optionally, in S3, the feed rate of the hydrogen-absorbing amorphous ribbon into the air jet mill is 1 kg / h to 20 kg / h, the pulverizing gas pressure inside the air jet mill is 0.6 MPa to 1.2 MPa, the classifier rotation speed is 3000 rpm to 8000 rpm, and the inert gas flow rate is ≥20 Nm³. 3 / h.

[0007] Optionally, in S4, a vacuum of 0 to 5 is applied before the dehydrogenation step. 10 -3 The vacuum level during the constant pressure stage of the dehydrogenation step is 0 to 0.2 Pa.

[0008] Optionally, in S5, S2 to S4 are repeated 1 to 20 times.

[0009] Optionally, the following steps may be included before S1: S0-1: Take a soft magnetic composite material and melt it in a vacuum under inert gas protection; S0-2: Amorphous ribbon material is obtained by rapid quenching under inert gas protection, wherein the solidification cooling rate of the rapid quenching process exceeds 10. 4 K / s.

[0010] Optionally, in S0-1, the atomic ratio of each component of the soft magnetic composite material satisfies Fe 100-a-b-c X a Y b Z c Where 15≤a≤30, 0<b≤5, 0<c≤3, X includes one or more of Si, B and C, Y includes one or more of Mo, Zr, Ni, Ti and Cr, and Z includes one or more of rare earth elements.

[0011] Optionally, the following steps may be included after S6: S7: The surface of the amorphous alloy strip powder is modified under inert gas protection, and an inert reinforcement layer is deposited on the surface of the amorphous alloy strip powder.

[0012] Optionally, in S7, the inert reinforcement layer is a silicon organic coating film, a metal fluoride film, or a graphene film.

[0013] Optionally, the following steps may be included after S7: S8: The surface-modified amorphous alloy strip powder is sieved according to the particle size range under inert gas protection and then vacuum-sealed.

[0014] The beneficial effects of the amorphous alloy strip powder and its preparation method of the present invention are as follows: the stress field generated by the expansion of the unit cell after the amorphous strip absorbs hydrogen is utilized. When hydrogen atoms are embedded in the atomic vacancies of the amorphous structure or the interstitial sites of metal atoms, the local volume expands several times, which lays the foundation for the formation of microcracks in the strip. Furthermore, the hydrogen atoms combine with the metal atoms of the amorphous strip to form weak polar bonds, replacing the original strong metallic bonds, weakening the local chemical bonds, and further inducing the formation of an irreversible microcrack network inside the strip. After subsequent dehydrogenation and deactivation treatment, the amorphous ribbon recovers a certain degree of toughness, achieving a state where "toughness recovery" and "microcrack network" coexist. At this point, combined with air jet milling for low-temperature, low-energy crushing, directional disintegration and micro-flask fragmentation are effectively achieved, forming an ideal thin-film powder particle shape. The crushing energy is extremely low, with no temperature rise problem, rather than high-energy impact collisions that form round or spherical high-activity ball milling powder. This effectively avoids crystallization caused by temperature rise and oxidation and agglomeration of powder caused by instantaneous high-energy impacts or local high temperatures. It fundamentally avoids the inherent agglomeration and wall adhesion problems of high-energy ball milling, and there is no impact and friction that leads to the formation of hard cluster structures. There is no need for secondary crushing or other methods to break up agglomerated particles. At the same time, the absence of high-intensity contact friction pulverization significantly reduces the risk of contamination. The powder purity, amorphousness, and flow morphology are highly controllable. The resulting amorphous alloy ribbon powder has high purity, high amorphousness, excellent powder performance, and no problems such as agglomeration. The preparation efficiency is high and there is no pollution. Attached Figure Description

[0015] Figure 1 This is a schematic flowchart of the method for preparing amorphous alloy strip powder according to an embodiment of the present invention; Figure 2 X-ray diffraction pattern of the amorphous alloy ribbon powder prepared in Example 1; Figure 3 The image shows the morphology of the amorphous alloy ribbon powder prepared in Example 1, obtained by scanning electron microscopy. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0017] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention's description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "comprising" and its variations are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the description below. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0018] This invention provides a method for preparing amorphous alloy strip powder.

[0019] like Figure 1 As shown, an embodiment of the present invention provides a method for preparing amorphous alloy strip powder, comprising the following steps: S1: Take amorphous ribbon and perform preliminary mechanical crushing to obtain amorphous ribbon fragments with uniform size; S2: The amorphous ribbon fragments are subjected to hydrogen absorption treatment at 150℃ to 300℃ to obtain hydrogen-absorbing amorphous ribbon, wherein the hydrogen pressure during the hydrogen absorption treatment is 0.3 MPa to 2.0 MPa; S3: The hydrogen-absorbing amorphous ribbon is subjected to air jet milling to obtain amorphous ribbon particles; S4: Dehydrogenation and deactivation treatment is performed on the amorphous ribbon particles by heating to 180℃ to 360℃ at a heating rate of 0 to 10℃ / min and holding for 0 to 300 min. S5: Repeat S2 to S4 to obtain tough amorphous state; S6: The tough amorphous material is pulverized to obtain amorphous alloy strip powder.

[0020] Specifically, amorphous ribbons refer to thin metallic ribbons with long-range disordered atomic structures prepared through rapid solidification technology. Their atomic arrangement lacks periodicity, thus exhibiting specific physical and chemical properties.

[0021] Preliminary mechanical crushing can be carried out using shearing, stamping, or coarse crushing machines. For example, amorphous ribbons can be sheared into fragments ranging from several millimeters to several centimeters in length, or formed into irregular but roughly uniform block fragments using stamping equipment. This operation aims to transform continuous amorphous ribbons into discrete fragments that are easier to process later, and to ensure the controllability and uniformity of fragment size, thereby improving the efficiency and uniformity of subsequent hydrogen absorption processing.

[0022] Hydrogen absorption treatment refers to the process of allowing hydrogen atoms to diffuse and dissolve into the internal structure of an amorphous ribbon under specific temperature and hydrogen pressure conditions. The embedding of hydrogen atoms causes cell expansion, generates an internal stress field, and weakens local chemical bonds, creating conditions for subsequent mechanical breakage. During the hydrogen absorption treatment, the hydrogen pressure is controlled between 0.3 MPa and 2.0 MPa. The hydrogen absorption treatment can be carried out in a closed reactor. Amorphous ribbon fragments are placed inside the reactor, then a vacuum is drawn and hydrogen is introduced. The temperature can be controlled between 150°C and 300°C, for example, it can be set to 200°C or 250°C. The hydrogen pressure can be maintained in the range of 0.3 MPa to 2.0 MPa, for example, it can be set to 0.8 MPa or 1.5 MPa. Under these conditions, hydrogen atoms can effectively diffuse into the internal structure of the amorphous ribbon, causing internal stress and forming a microcrack network.

[0023] Air jet milling is a method of ultrafine grinding of materials by using a high-speed airflow to cause material particles to collide and rub against each other. This method is typically carried out in an inert gas environment to prevent material oxidation and agglomeration. Hydrogen-absorbing amorphous ribbons are fed into the air jet mill, where they are pulverized into particles through the impact and shearing action of the high-speed airflow, causing them to collide and rub against each other. The operating parameters of the air jet mill can be adjusted according to the desired particle size and output. For example, a lower feed rate and air pressure can be used to obtain coarse particles, while a higher feed rate and air pressure can be used to improve grinding efficiency.

[0024] Dehydrogenation and deactivation treatment refers to the removal of hydrogen atoms from hydrogen-absorbing amorphous ribbons through methods such as heating, restoring a certain degree of toughness and reducing surface activity, thereby improving the stability and workability of the powder. This treatment can be performed in a vacuum furnace or an inert atmosphere furnace. The amorphous ribbon particles are slowly heated at a rate controlled within the range of 0 to 10 °C / min, for example, 5 °C / min. The material is heated to a target temperature, such as 180 °C, 250 °C, or 360 °C, and held at this temperature for 0 to 300 min, for example, 60 min or 180 min. This process aims to remove adsorbed hydrogen from the material while restoring some toughness and reducing its surface activity, thereby improving the stability and storage performance of the powder.

[0025] Tough amorphous materials refer to a state in which amorphous ribbons, after hydrogen absorption and partial dehydrogenation treatments, form a microcrack network within them while maintaining a certain degree of toughness. In this state, the material is easily subjected to directional crushing at lower energies. The cycles of hydrogen absorption treatment, air jet milling, and dehydrogenation deactivation treatment can be repeated. For example, a complete S2-S4 cycle can be performed, or multiple cycles can be repeated. After each cycle, the internal stress state and toughness of the material change, thus providing favorable conditions for the final crushing process.

[0026] Pulverization refers to the process of breaking ductile amorphous materials into amorphous alloy ribbon powder with a desired particle size range through mechanical force. Various mechanical pulverization equipment can be used for ductile amorphous materials, such as hammer mills, roller mills, or disc mills. Because ductile amorphous materials have already formed a microcrack network and possess toughness through hydrogen absorption and dehydrogenation treatment, efficient pulverization can be achieved with relatively low energy input, forming amorphous alloy ribbon powder with specific morphology and particle size distribution. The pulverization process can be carried out under an inert atmosphere to prevent oxidation.

[0027] In this embodiment, the stress field is generated by the expansion of the unit cell after the amorphous ribbon absorbs hydrogen. When hydrogen atoms are embedded in the atomic vacancies of the amorphous structure or the interstitial sites of metal atoms, the local volume expands several times, which lays the foundation for the formation of microcracks in the ribbon. Furthermore, the hydrogen atoms combine with the metal atoms of the amorphous ribbon to form weak polar bonds, replacing the original strong metallic bonds. The local chemical bonds are weakened, which further leads to the formation of an irreversible microcrack network inside the ribbon. After subsequent dehydrogenation and deactivation treatment, the amorphous ribbon recovers a certain degree of toughness, achieving a state where "toughness recovery" and "microcrack network" coexist. At this point, combined with air jet milling for low-temperature, low-energy crushing, directional disintegration and micro-flask fragmentation are effectively achieved, forming an ideal thin-film powder particle shape. The crushing energy is extremely low, with no temperature rise problem, rather than high-energy impact collisions that form round or spherical high-activity ball milling powder. This effectively avoids crystallization caused by temperature rise and oxidation and agglomeration of powder caused by instantaneous high-energy impacts or local high temperatures. It fundamentally avoids the inherent agglomeration and wall adhesion problems of high-energy ball milling, and there is no impact and friction that leads to the formation of hard cluster structures. There is no need for secondary crushing or other methods to break up agglomerated particles. At the same time, the absence of high-intensity contact friction pulverization significantly reduces the risk of contamination. The powder purity, amorphousness, and flow morphology are highly controllable. The resulting amorphous alloy ribbon powder has high purity, high amorphousness, excellent powder performance, and no problems such as agglomeration. The preparation efficiency is high and there is no pollution.

[0028] Specifically, the hydrogen absorption treatment time in S2 is controlled between 1 hour and 10 hours.

[0029] Optionally, in S3, the feed rate of the hydrogen-absorbing amorphous ribbon into the air jet mill is 1 kg / h to 20 kg / h, the pulverizing gas pressure inside the air jet mill is 0.6 MPa to 1.2 MPa, the classifier rotation speed is 3000 rpm to 8000 rpm, and the inert gas flow rate is ≥20 Nm³. 3 / h.

[0030] Specifically, the feed rate refers to the mass of hydrogen-absorbing amorphous ribbon entering the air jet mill per unit time, and its range is set from 1 kg / h to 20 kg / h. Precise control of this parameter is crucial for maintaining the stable operation of the air jet mill. For example, precise control of the feed rate can be achieved by equipping it with an adjustable-speed screw feeder or vibrating feeder, ensuring that the material enters the grinding chamber uniformly and continuously, avoiding equipment blockage due to excessively fast feeding or reduced production efficiency due to excessively slow feeding.

[0031] The grinding pressure refers to the gas pressure inside the air jet mill used to drive the high-speed collision and shearing of materials, and its range is set from 0.6 MPa to 1.2 MPa. This pressure directly affects the grinding energy and the final particle size of the powder. For example, a high-pressure air compressor in conjunction with a precision pressure regulating valve can be used to provide and stabilize the grinding pressure, or high-purity nitrogen can be used as the grinding medium to provide sufficient impact force to effectively break up hydrogen-absorbing amorphous ribbons, while avoiding excessive grinding or unnecessary energy consumption due to excessively high pressure.

[0032] The classifying wheel speed refers to the rotational speed of the classifying wheel inside the air jet mill used to separate powders of different particle sizes, and its range is set from 3000 rpm to 8000 rpm. This parameter determines the particle size distribution and fineness of the powder. For example, the classifying wheel can be driven by a variable frequency speed control motor to achieve precise speed adjustment, thereby effectively controlling the upper limit of the powder particle size according to the target product particle size requirements and ensuring the uniformity of the powder particle size distribution.

[0033] Inert gas flow rate refers to the flow rate of the inert gas used to provide a protective atmosphere during the air jet milling process, and it is set to ≥20 Nm. 3 / h. Ensuring this flow rate is crucial to preventing oxidation of amorphous ribbon during the pulverization process. For example, high-purity nitrogen or argon can be used as an inert gas, and its flow rate can be precisely controlled through a flow meter and regulating valve to create a stable protective environment within the pulverization chamber, effectively isolating oxygen and thus ensuring the purity and amorphousness of the amorphous alloy ribbon powder.

[0034] In this optional embodiment, by optimizing and precisely controlling the key operating parameters in the air jet milling step S3 of the amorphous alloy ribbon powder preparation method, the efficiency and stability of the pulverization process can be significantly improved. The pulverization energy of the air jet milling process is extremely low, with no temperature rise issue. Specifically, by controlling the feed rate of the hydrogen-absorbing amorphous ribbon to 1 kg / h to 20 kg / h, it can be ensured that the material enters the air jet mill uniformly and continuously, avoiding equipment blockage or inefficiency caused by improper feeding, thereby maintaining the smoothness of the production process. At the same time, setting the pulverizing air pressure in the air jet mill to 0.6 MPa to 1.2 MPa provides suitable pulverizing energy, enabling the hydrogen-absorbing amorphous ribbon to be effectively pulverized to form the required amorphous ribbon particles, avoiding energy waste and over-pulverization. In addition, by controlling the speed of the classifying wheel to 3000 rpm to 8000 rpm, the particle size distribution of the powder can be precisely adjusted, ensuring that the obtained amorphous ribbon particles have a uniform particle size, which is crucial for the subsequent dehydrogenation and deactivation treatment and the performance of the final product. More importantly, by ensuring an inert gas flow rate ≥ 20 Nm 3 The air jet mill, operating at a constant speed, creates a sufficiently inert protective atmosphere throughout the entire milling process, effectively isolating oxygen and significantly reducing the risk of oxidation of the amorphous ribbon during milling. This ensures the high purity and high amorphousness of the amorphous alloy ribbon powder. In summary, the synergistic optimization of these parameters not only solves the problems of low efficiency, uneven particle size, high oxidation risk, and equipment instability that may occur in traditional air jet milling processes, but also ensures that the prepared amorphous alloy ribbon powder possesses excellent quality and performance, laying a solid foundation for subsequent dehydrogenation and deactivation treatment and the application of the final product.

[0035] Specifically, the time for air jet milling in S3 is controlled between 1 hour and 10 hours.

[0036] Optionally, in S4, a vacuum of 0 to 5 is applied before the dehydrogenation step. 10 -3 The vacuum level during the constant pressure stage of the dehydrogenation step is 0 to 0.2 Pa.

[0037] Specifically, before the dehydrogenation process, the reaction chamber is thoroughly evacuated to reduce the pressure inside the chamber to 0 to 5 ppm. 10 -3Achieving an ultra-high vacuum of 0.2 Pa is typically required. This vacuum level usually necessitates a multi-stage vacuum pump system. For example, a mechanical pump (such as a rotary vane pump or Roots pump) can be used to initially evacuate the chamber to a lower vacuum level, followed by a high-vacuum pump (such as a turbomolecular pump or diffusion pump) for fine evacuation to thoroughly remove air, water vapor, and other potentially contaminating gases from the chamber. This pre-evacuation operation aims to provide an extremely pure environment for the subsequent dehydrogenation process, eliminating the possibility of oxidation or contamination of the amorphous ribbon particles due to residual gases. Subsequently, during the constant-pressure phase of the dehydrogenation step, the vacuum level within the chamber is maintained within the range of 0 to 0.2 Pa by precisely controlling the pumping speed of the vacuum pump or adjusting the vacuum valves. This constant-pressure vacuum control can be achieved by equipping the chamber with a high-precision vacuum gauge (such as a capacitive thin-film gauge) and an automatic feedback control system, ensuring that hydrogen is continuously and efficiently discharged from the chamber during the process of hydrogen release from the amorphous ribbon particles due to heating, while preventing the infiltration of external gases.

[0038] In this optional embodiment, a thorough pre-vacuum is performed before the dehydrogenation and deactivation treatment S4, and a stable high vacuum environment is maintained during the dehydrogenation process, effectively solving the problem of oxidation and contamination of amorphous alloy strip powder caused by residual gas. The chamber is evacuated to 0 to 5 volts before the dehydrogenation step. 10 -3 The vacuum level of 0 to 0.2 Pa effectively removes impurities such as oxygen and water vapor from the reaction environment, laying a pure foundation for the subsequent temperature-controlled dehydrogenation process and preventing oxidation of the amorphous ribbon particles at high temperatures. Simultaneously, maintaining the vacuum level at 0 to 0.2 Pa during the constant-pressure stage of the dehydrogenation step ensures continuous and efficient removal of hydrogen, preventing its accumulation or re-adsorption within the chamber and further blocking the entry of external impurity gases. This guarantees the stability of the dehydrogenation process and the purity of the amorphous ribbon particles. This precise vacuum control not only optimizes dehydrogenation efficiency and ensures complete removal of hydrogen atoms, but more importantly, it fundamentally avoids the negative impact of residual gas on the amorphity and purity of the amorphous alloy ribbon powder, resulting in high-purity, high-amorphous amorphous alloy ribbon powder.

[0039] Optionally, in S5, S2 to S4 are repeated 1 to 20 times.

[0040] Specifically, the number of cycles for the three steps—hydrogen absorption treatment S2, air jet milling treatment S3, and dehydrogenation and deactivation treatment S4—is limited. Repeated hydrogen absorption treatment S2 aims to induce stress fields and microcrack networks in the amorphous ribbon by embedding hydrogen atoms into its structure, thereby achieving material embrittlement. Air jet milling treatment S3 mechanically pulverizes the material based on embrittlement, reducing particle size. Dehydrogenation and deactivation treatment S4 aims to restore some toughness, preventing excessive embrittlement that could lead to pulverization difficulties or decreased powder performance. The number of cycles is crucial for the formation of the final tough amorphous state. For example, the number of cycles can be dynamically adjusted by real-time monitoring of parameters such as the embrittlement changes, particle size distribution, or hydrogen content of the amorphous ribbon to achieve an optimal embrittlement-toughening balance. Alternatively, a fixed range of cycles can be determined through pre-experiments or model calculations based on the initial composition and thickness of the amorphous ribbon and the particle size requirements of the target powder to ensure the stability of the preparation process and the consistency of the product.

[0041] In this optional embodiment, the problems of low preparation efficiency and unstable powder quality caused by the uncertainty of the number of repetitions are effectively solved. Specifically, this limitation ensures that the amorphous ribbon undergoes sufficient but not excessive hydrogen absorption, air jet milling, and dehydrogenation cycle treatment. The lower limit of the number of repetitions (1 time) ensures that the amorphous ribbon can fully undergo at least one embrittlement, crushing, and toughening process, laying the foundation for subsequent crushing treatment and avoiding the impact of insufficient embrittlement on the crushing effect. The upper limit of the number of repetitions (20 times) avoids unnecessary energy consumption and time waste, while preventing excessive embrittlement of the material due to excessive repetition, which may lead to a decrease in powder performance or the generation of too much fine powder. By precisely controlling the number of repetitions within the range of 1 to 20 times, this application can stably obtain toughened amorphous materials with moderate brittleness and toughness, thereby significantly improving the preparation efficiency of amorphous alloy ribbon powder and the quality stability of the final powder, ensuring the effective implementation of subsequent low-temperature, low-energy crushing treatment, and ultimately obtaining amorphous alloy ribbon powder with ideal morphology, high purity, and good amorphousness.

[0042] Optionally, the following steps may be included before S1: S0-1: Take a soft magnetic composite material and melt it in a vacuum under inert gas protection; S0-2: Amorphous ribbon material is obtained by rapid quenching under inert gas protection, wherein the solidification cooling rate of the rapid quenching process exceeds 10. 4 K / s.

[0043] Specifically, in step S0-1, a suitable soft magnetic composite material is first selected as the raw material for preparing amorphous ribbons. These soft magnetic composite materials are typically composed of iron-based, cobalt-based, or nickel-based alloys, with added non-metallic elements such as silicon, boron, and carbon, as well as transition metal elements such as molybdenum, zirconium, nickel, titanium, and chromium, to optimize their amorphous forming ability and magnetic properties. To ensure the purity of the melt and avoid oxidation, the melting process is carried out under vacuum with an inert gas atmosphere. Inert gases, such as high-purity argon, nitrogen, or helium, effectively isolate the melt from oxygen and nitrogen in the air, preventing the introduction of harmful impurities. The vacuum environment helps remove dissolved gases and volatile impurities from the melt. Melting methods can include induction melting, arc melting, or electron beam melting, among which induction melting is often chosen due to its high heating efficiency and good stirring uniformity.

[0044] Subsequently, in step S0-2, the molten liquid alloy is subjected to rapid quenching to obtain an amorphous ribbon. This rapid quenching is also carried out under inert gas protection to prevent oxidation or the introduction of new impurities during the rapid solidification of the high-temperature liquid alloy, thereby ensuring the surface quality and internal purity of the amorphous ribbon. Rapid quenching is a key step in the preparation of amorphous materials. Its purpose is to solidify the liquid metal at an extremely high rate, thereby inhibiting the formation and growth of crystal nuclei, preventing atoms from achieving long-range ordered arrangement, and ultimately forming a disordered amorphous structure. Commonly used rapid quenching methods include single-roller casting, double-roller casting, or planar flow casting. These methods can spray molten metal onto the surface of a high-speed rotating cooling roller to achieve ultra-fast solidification. This application specifically emphasizes that the solidification cooling rate of the rapid quenching process exceeds 10. 4 K / s. This high cooling rate is a core technical parameter to ensure the formation of a high amorphous structure in the alloy. It is much higher than the cooling rate of traditional casting, which can effectively avoid the precipitation of crystalline phases, thereby obtaining strips with excellent amorphous structures.

[0045] The molten alloy obtained from melting is transported through a sealed channel. When a single-roller system is used to prepare strip, the molten metal is sprayed onto the surface of a high-speed rotating single roll, which is usually internally forced to water-cool. The metal quickly solidifies and peels off from the roll to form a continuous amorphous strip. When a parallel double-roller system is used to prepare strip of uniform thickness, the molten metal is injected into a narrow slit area formed between two high-speed, counter-rotating, forced-water-cooled double rolls. The molten metal is rapidly squeezed and cooled by both sides to solidify, forming a continuous amorphous strip with a more uniform and controllable thickness, which is then transported downwards for output.

[0046] In this optional embodiment, the quality of the amorphous alloy ribbon powder is ensured from the source in the preparation method. Vacuum melting under inert gas protection effectively avoids impurity contamination and oxidation, ensuring the high purity of the soft magnetic composite melt. Based on this, rapid quenching under inert gas protection, especially with a solidification cooling rate exceeding 10...4 Strict control of K / s ensures that the prepared amorphous ribbon has extremely high amorphity, avoiding the formation of crystalline phases. This high-purity, high-amorphous amorphous ribbon, as the starting material for subsequent hydrogen absorption treatment (S2), significantly improves the uniform embedding efficiency of hydrogen atoms in the amorphous structure, promotes the effective formation of the stress field, and lays a solid foundation for subsequent air jet milling (S3) and dehydrogenation deactivation treatment (S4). The pure and highly amorphous ribbon can more effectively form a microcrack network and achieve directional disintegration and micro-fragmentation in subsequent low-temperature, low-energy crushing (S6), thereby obtaining an ideal sheet-like powder particle morphology. This effectively avoids problems such as low crushing efficiency, poor powder quality, crystallization, and agglomeration caused by initial material defects, ensuring the high purity, high amorphity, and excellent flow morphology of the final amorphous alloy ribbon powder.

[0047] Optionally, in S0-1, the atomic ratio of each component of the soft magnetic composite material satisfies Fe 100-a-b-c X a Y b Z c Where 15≤a≤30, 0<b≤5, 0<c≤3, X includes one or more of Si, B and C, Y includes one or more of Mo, Zr, Ni, Ti and Cr, and Z includes one or more of rare earth elements.

[0048] Specifically, Fe 100-a-b-c X a Y b Z c The atomic ratios of the components are carefully designed. Among them, elements X, such as Si, B, and C, are key amorphous forming elements. These elements effectively lower the eutectic point of the melt, increase its viscosity, and inhibit long-range diffusion and ordered arrangement of atoms during cooling, thereby significantly improving the glass-forming ability of the alloy. For example, Si and B are common amorphous forming elements that can form eutectic systems with Fe, lowering the crystallization temperature and promoting the formation of amorphous phases. C plays a similar role, hindering crystal growth by forming carbides or dissolving in the matrix. The range of a is limited to 15 to 30, ensuring that the total atomic percentage of amorphous forming element X is sufficient to effectively inhibit crystallization, preventing amorphization and crystallization, while also considering the material's saturation magnetic induction and toughness, avoiding performance degradation due to excessive content.

[0049] In addition, elements such as Mo, Zr, Ni, Ti, and Cr are introduced as amorphous stabilizing or structural refining elements. These elements can further improve the thermal stability of amorphous alloys and delay the crystallization transformation of the amorphous phase during heating by forming complex atomic clusters or compounds with matrix elements. For example, Mo and Zr can significantly improve the glass-forming ability and thermal stability of amorphous alloys, while Ni, Ti, and Cr may refine the amorphous structure and enhance its resistance to crystallization by changing the interatomic bonding strength or forming solid solutions. The range of b is limited to 0 to 5, aiming to achieve significant stabilizing effects with small amounts, while avoiding negative effects such as increased melting point, precipitation of crystalline phases, or decreased saturation magnetic induction that may result from excessive addition.

[0050] Furthermore, elements Z, namely rare earth elements, are introduced as trace additives. Rare earth elements in amorphous alloys can improve the glass-forming ability of the alloy through their unique electronic structure and atomic radius, and may also have a positive impact on the magnetic properties of the material. For example, rare earth elements can act as inhibitors of heterogeneous nucleation of crystal nuclei, or promote the formation of amorphous phases by altering the short-range ordered structure of the melt. The range of c is limited to between 0 and 3, aiming to utilize the unique effects of rare earth elements while avoiding the potential negative effects of increased costs or the formation of coarse crystalline phases due to excessive content.

[0051] In this optional embodiment, precisely defining the atomic ratios of each component in the soft magnetic composite material can significantly optimize its glass-forming ability. Specifically, within a suitable atomic percentage range, the amorphous forming element X can effectively lower the melt eutectic point, increase viscosity, and suppress long-range atomic diffusion. This ensures that during the rapid cooling process of SO-2, even with extremely high solidification cooling rates, the melt can solidify smoothly into a highly amorphous ribbon, preventing the formation of microcrystals. Simultaneously, the addition of a small amount of the amorphous stabilizing element Y further enhances the thermal stability of the amorphous alloy, enabling the resulting amorphous ribbon to better maintain its amorphous structure and resist crystallization tendencies during subsequent hydrogen absorption, air jet milling, and dehydrogenation treatments. Furthermore, the introduction of a small amount of rare earth element Z can further improve the glass-forming ability and material properties of the alloy. This composition optimization ensures the quality of amorphous ribbons from the source, providing high-quality raw materials with high amorphousness and uniform structure for subsequent hydrogen absorption treatment, air jet milling, and final powder preparation. This ensures that the final amorphous alloy ribbon powder has excellent soft magnetic properties and low loss, effectively solving the problems of insufficient amorphousness and microcrystal formation caused by unoptimized composition.

[0052] Optionally, the following steps may be included after S6: S7: The surface of the amorphous alloy strip powder is modified under inert gas protection, and an inert reinforcement layer is deposited on the surface of the amorphous alloy strip powder.

[0053] Specifically, surface modification refers to altering the composition, structure, and properties of the surface of amorphous alloy strip powder through physical or chemical methods to endow it with new functions or improve its original properties. Here, its role is to enhance the oxidation resistance, corrosion resistance, and chemical stability of the amorphous alloy strip powder. Surface modification can be achieved in various ways. For example, chemical vapor deposition (CVD) technology can be used, where gaseous precursors are introduced at high temperatures, causing them to react chemically on the powder surface and deposit to form a modified layer. Alternatively, wet chemical coating technology can be used, dispersing the powder in a solution containing a modifier, and forming a coating layer on the powder surface through precipitation, adsorption, or polymerization. Furthermore, atomic layer deposition (ALD) technology can be used, where two or more gaseous precursors are alternately introduced to grow a uniform and dense modified film layer by layer on the powder surface. Meanwhile, the inert gas protection refers to placing the amorphous alloy strip powder in an inert gas (such as high-purity argon or nitrogen) environment throughout the entire surface modification process to isolate it from oxygen and water vapor in the air and prevent the powder from oxidizing or becoming contaminated during the modification process.

[0054] An inert reinforcement layer refers to a chemically stable protective coating formed on the surface of amorphous alloy strip powder that is not easily reactive with the external environment. Its main function is to physically isolate harmful substances (such as oxygen and water vapor) from the outside world, thereby preventing powder oxidation, corrosion, or agglomeration, while improving the mechanical strength and chemical stability of the powder. The inert reinforcement layer can be made of various materials, such as an inorganic oxide layer, such as an alumina (Al2O3) layer or a silicon dioxide (SiO2) layer formed by atomic layer deposition or chemical vapor deposition; a nitride layer, such as a silicon nitride (Si3N4) layer or a titanium nitride (TiN) layer formed by physical vapor deposition or chemical vapor deposition; or a polymer coating layer, such as a polyethylene terephthalate (PET) film formed by in-situ polymerization or solution coating.

[0055] In this optional embodiment, the surface modification step S7 is introduced immediately after the amorphous alloy strip powder preparation is completed (S6), effectively solving the problem of oxidation and surface contamination of the powder due to environmental influences during subsequent processing or storage. Specifically, surface modification under inert gas protection can fundamentally isolate oxygen and water vapor in the air, avoiding contact between the active surface of the powder and harmful substances during the modification process, thereby ensuring the purity of the modification operation and maximizing the maintenance of the inherent amorphousness, purity, and excellent functional stability of the amorphous alloy strip powder. At the same time, by depositing an inert reinforcement layer on the powder surface, a robust physical barrier is formed. This inert reinforcement layer can not only effectively block the intrusion of external pollutants and moisture, significantly improving the chemical stability and oxidation resistance of the powder, but also enhance the mechanical durability of the powder to a certain extent, reducing surface damage or agglomeration that may occur during subsequent handling, storage, and application. These measures work together to prevent the risk of surface degradation of amorphous alloy strip powder from the source, ensuring its long-term reliability and stable application performance, thus providing high-quality amorphous powder for applications such as the preparation of high-performance soft magnetic composite magnetic powder cores.

[0056] Optionally, in S7, the inert reinforcement layer is a silicon organic coating film, a metal fluoride film, or a graphene film.

[0057] Specifically, silicone-organic coated films are polymer films with silicon as the backbone and containing organic groups. They can be prepared in various ways. For example, through chemical vapor deposition (CVD) or plasma-enhanced chemical vapor deposition (PECVD), silicone-containing organic precursors (such as hexamethyldisiloxane HMDSO and tetraethoxysilane TEOS) are reactively deposited on the surface of amorphous alloy strip powder to form a dense silicone-organic polymer layer. Alternatively, solution coating methods can be used, where silicone-organic polymers (such as polysiloxanes and silicone resins) are dissolved in a suitable solvent, and the solution is uniformly coated onto the powder surface through spraying, dip coating, or fluidized bed coating, followed by curing.

[0058] Metal fluoride films are thin compound films formed by metal elements and fluorine elements. Their preparation methods include, but are not limited to, physical vapor deposition (PVD), such as magnetron sputtering or evaporation deposition, where metal fluoride targets (e.g., MgF2, CaF2, AlF3) are sputtered or evaporated in a vacuum environment to deposit on the surface of amorphous alloy strip powder to form a thin film. Another method is through chemical conversion, where amorphous alloy strip powder is reacted with fluorine-containing compounds (e.g., HF gas or fluoride solutions) under specific conditions, transforming the surface metal atoms into the corresponding metal fluoride layer.

[0059] Graphene films are two-dimensional carbon material films composed of carbon atoms arranged in a hexagonal honeycomb lattice with sp2 hybrid orbitals. They can be prepared using chemical vapor deposition (CVD), where a carbon source gas (such as methane) and a catalyst are introduced onto the surface of amorphous alloy ribbon powder, and a graphene film is grown through a high-temperature reaction. Alternatively, a redox method can be used, where a graphene oxide dispersion is mixed with amorphous alloy ribbon powder, and a reducing agent (such as hydrazine hydrate or vitamin C) is used to reduce the graphene oxide to graphene, forming a coating layer on the powder surface.

[0060] In this optional embodiment, when surface modifying amorphous alloy strip powder under inert gas protection, selecting a silicon-organic coating film, a metal fluoride film, or a graphene film as the inert reinforcing layer can effectively solve the problems of insufficient protection, introduction of additional impurities, or impact on powder flowability and stability caused by improper material selection. Specifically, using a silicon-organic coating film can form a uniform and dense organic protective layer, effectively isolating air and moisture, thereby preventing oxidation of the amorphous alloy strip powder. Simultaneously, its organic properties help improve powder dispersibility and flowability. If a metal fluoride film is used, its inherent high chemical inertness and excellent corrosion resistance provide robust protection for the amorphous alloy strip powder, enabling it to resist environmental erosion and chemical attack while ensuring high thermal stability. Choosing a graphene film as the reinforcing layer, with its ultra-thin, high-strength, and excellent barrier properties, significantly enhances the surface stability of the powder without significantly increasing particle size, optimizes powder flowability, and reduces agglomeration. The selection of these specific materials avoids the potential for protective failure, contamination risks, or performance degradation that may result from the use of incompatible materials, thereby ensuring the high purity, high amorphicity, and excellent functional properties of the amorphous alloy strip powder, and improving its overall quality and reliability.

[0061] Optionally, the following steps may be included after S7: S8: The surface-modified amorphous alloy strip powder is sieved according to the particle size range under inert gas protection and then vacuum-sealed.

[0062] Specifically, "screening according to particle size range under inert gas protection" refers to the particle size classification of surface-modified amorphous alloy strip powder through physical separation methods in an inert atmosphere that isolates oxygen and moisture. This inert atmosphere typically uses high-purity nitrogen or argon to ensure that the powder is not oxidized or contaminated during the screening process. Screening equipment can include vibrating screens, air classifiers, or centrifugal screens. By setting screens with different aperture sizes, the powder is separated into multiple particle size ranges, thereby obtaining amorphous alloy strip powder with a uniform particle size distribution. For example, precise particle size classification can be performed using multi-stage vibrating screens or air classifiers in a nitrogen- or argon-filled sealed glove box or isolator; alternatively, automated screening equipment with an integrated inert gas purging or circulation system can be used to ensure that the entire screening process is carried out in a strictly inert environment.

[0063] Vacuum sealing packaging refers to sealing sieved amorphous alloy strip powder under vacuum conditions to completely isolate the powder from contact with outside air. This step aims to prevent the powder from being corroded by oxygen, moisture, or other environmental contaminants during storage and transportation. Packaging materials typically include composite film bags with good barrier properties (such as aluminum-plastic composite film), vacuum packaging bags, or metal / glass containers with sealing gaskets. In practice, the sieved powder is dispensed into pre-prepared packaging containers, and then the air inside the containers is removed to a preset low pressure using a vacuum packaging machine. Subsequently, heat sealing or mechanical sealing is performed to ensure the packaging is airtight.

[0064] In this optional embodiment, sieving according to particle size range under inert gas protection effectively solves the problem of uneven particle size distribution of amorphous alloy strip powder after surface modification, ensuring the particle size consistency of the final product and thus avoiding subsequent performance fluctuations due to particle size inconsistency. Simultaneously, the introduction of an inert gas environment isolates oxygen and airborne impurities from the source, effectively preventing oxidation or contamination of the highly active powder after surface modification during sieving, maintaining the powder's high purity and amorphousness. Secondly, the implementation of vacuum-sealed packaging further completely isolates the powder from contact with the external environment, fundamentally eliminating the risks of oxidation, moisture, and contamination during storage and transportation, greatly improving the long-term storage reliability and stability of the amorphous alloy strip powder. This precise particle size control and strict protective packaging immediately after surface modification effectively locks in and maintains the optimized state imparted by step S7, preventing secondary degradation of the powder during subsequent processing and storage, allowing the excellent performance of the amorphous alloy strip powder to be fully realized and maintained over a long period.

[0065] Another embodiment of the present invention provides an amorphous alloy strip powder, which is prepared by the amorphous alloy strip powder preparation method described above.

[0066] Specifically, this amorphous alloy ribbon powder refers to a powdered material obtained from amorphous ribbons through a specific crushing process. Its core characteristic lies in maintaining an amorphous structure, i.e., long-range disorder of atomic arrangement, thus endowing it with unique physical and magnetic properties, such as high saturation magnetic induction, high resistivity, and low coercivity. This powder typically has a flake-like or irregular morphology, distinguishing it from spherical or regularly shaped atomized powders. The method of preparing amorphous alloy ribbon powder emphasizes the source and formation process of the powder. Through specific preparation methods, it is possible to ensure that the obtained amorphous alloy ribbon powder has high purity, high amorphousness, controlled particle size distribution, and specific morphology. This preparation method typically involves steps such as pretreatment of the amorphous ribbon, hydrogen absorption, air jet milling, dehydrogenation, repeated recycling, and final crushing and post-treatment. This preparation method aims to overcome the problems of crystallization, contamination, and difficulty in particle size control existing in traditional powder preparation methods, thereby obtaining amorphous powder products with excellent performance.

[0067] In this embodiment, the amorphous alloy ribbon powder is prepared using a specific method, effectively solving problems such as contamination, crystallization, and inconsistent particle size control in traditional amorphous powder preparation. Specifically, this preparation method utilizes the stress field generated by the expansion of the unit cell after hydrogen absorption in the amorphous ribbon, and the principle of weakening local chemical bonds through the combination of hydrogen atoms and iron atoms. After subsequent dehydrogenation, the amorphous ribbon regains a certain degree of toughness while forming a microcrack network. This unique mechanism enables directional disintegration and micro-fragmentation under low temperature and low energy conditions, thereby obtaining an ideal sheet-like powder particle morphology. The amorphous alloy ribbon powder prepared in this way fundamentally avoids oxidation and severe agglomeration caused by high-temperature crushing, effectively avoiding crystallization caused by temperature rise and agglomeration caused by instantaneous high-energy impact or local high temperature, thus ensuring the high amorphity of the powder. At the same time, since high-intensity contact friction pulverization is not used, the introduction of foreign impurities is significantly reduced, ensuring the high purity of the powder. Furthermore, this method can better control the particle size distribution and morphology of powders, enabling them to have stable performance and reliable application prospects in fields such as catalysis, battery anodes, composite material reinforcing phases, metal injection molding, 3D printing, and thermal spraying.

[0068] The present invention will be further described below with reference to specific embodiments.

[0069] Example 1: Preparation of amorphous alloy strip powder.

[0070] 1. Alloy smelting: The alloy molecular formula constituting the soft magnetic composite material is Fe. 76 Si9B 12 Cr2Dy1 is smelted in a vacuum furnace; 2. Rapid cooling of the belt: Nitrogen is used as a protective gas, and single-roll rapid cooling is employed at a cooling rate of 10. 6 K / s 3. Strip pretreatment: Cut the strip into 3×5mm pieces; 4. Hydrogen absorption treatment: The parameters for the hydrogen absorption furnace are as follows: temperature: 195℃, pressure: 1.2 MPa high-purity hydrogen, time: 3.2 hours, hydrogen content monitoring: stop when the peak value drops by 7%; 5. Airflow mill treatment: feed rate: 15 kg / h, grinding air pressure: 1.0 MPa, classifier speed: 5000 rpm, inert gas flow rate: 25 Nm³ 3 / h; 6. Dehydrogenation treatment: The vacuum programmable temperature control furnace is set with the following parameters: heating range: 180-360℃, heating rate: 2.5℃ / min, holding at 360℃ for 150 min; vacuum setting parameters: pre-evacuated to 4... 10 -3 Pa, vacuum degree during constant pressure stage is 0.15 Pa; vibration frequency is 2 Hz amplitude tumbling; protective gas: argon purging, flow rate control is 12 L / min; stop when hydrogen partial pressure is less than 0.05 Pa; 7. Repeat steps 4, 5, and 6 once; 8. Crushing process: The ball material for the vibratory ball mill is zirconium oxide, an inert atmosphere is introduced, the rotation speed is 280 rpm, and the working time is 45 min. 9. Post-finishing treatment: Under nitrogen atmosphere, the surface modification temperature is controlled at 400℃ and the time is controlled at 60 min; 10. Sieving, grading, collection and packaging: The powder is sieved and vacuum packaged under nitrogen protection.

[0071] The X-ray diffraction pattern of the amorphous alloy ribbon powder prepared in this embodiment is as follows: Figure 2 As shown, no obvious peak value appears in the diffraction intensity, exhibiting good non-static characteristics; the scanning electron microscope morphology image of the amorphous alloy ribbon powder prepared in this embodiment is shown below. Figure 3 As shown, the powder edges are regular in shape, with no clusters or agglomerations.

[0072] Example 2 This embodiment is identical to Embodiment 1 except for the following steps: 4. Hydrogen absorption treatment: The parameters for the hydrogen absorption furnace are as follows: temperature: 235℃, pressure: 0.45 MPa high-purity hydrogen, time: 2.5 hours, hydrogen content monitoring: stop when the peak value drops by 7%; Example 3 This embodiment is identical to Embodiment 1 except for the following steps: 2. Rapid cooling strip production: The strip is rapidly cooled using two rollers to produce a thickness of 14 μm. 4. Hydrogen absorption treatment: The parameters of the hydrogen absorption furnace are set as follows: temperature: 98℃, pressure: 0.8 MPa, high-purity hydrogen + 10% helium for accelerated diffusion, time: 65 min, hydrogen content monitoring: stop when the peak value drops by 7%; Example 4 This embodiment is identical to Embodiment 1 except for the following steps: 7. Repeat steps 4, 5, and 6 three times. Example 5 This embodiment is identical to Embodiment 1 except for the following steps: 8. Crushing process: The ball material for the vibratory ball mill is zirconium oxide, an inert atmosphere is introduced, the rotation speed is 350 rpm, and the working time is 60 min.

[0073] The laser particle size, oxygen content, and saturation magnetization of the amorphous alloy strip powders prepared in Examples 1 to 5 were tested. The test results are shown in Table 1. Comparing Example 1 with Examples 2 and 3 shows that the hydrogen absorption process is the core bottleneck determining product performance and must be strictly limited within the protection window of this invention. Comparing Example 1 with Example 4 shows that the number of cycles is the preferred method for controlling product specifications in industrial production. Cross-comparison of Examples 1, 2, 3, 4, and 5 shows a strong positive correlation between powder oxygen content and specific surface area.

[0074] Table 1. Test data of amorphous alloy ribbon powders prepared in Examples 1 to 5.

[0075] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for preparing amorphous alloy strip powder, characterized in that, Includes the following steps: S1: Take amorphous ribbon and perform preliminary mechanical crushing to obtain amorphous ribbon fragments with uniform size; S2: The amorphous ribbon fragments are subjected to hydrogen absorption treatment at 150°C to 300°C to obtain hydrogen-absorbing amorphous ribbon, wherein the hydrogen pressure during the hydrogen absorption treatment is 0.3 MPa to 2.0 MPa; S3: The hydrogen-absorbing amorphous ribbon is subjected to air jet milling to obtain amorphous ribbon particles; S4: The amorphous ribbon particles are subjected to dehydrogenation and deactivation treatment by heating to 180°C to 360°C at a heating rate of 0 to 10°C / min and holding at that temperature for 0 to 300 min. S5: Repeat S2 to S4 to obtain a tough amorphous state; S6: The tough amorphous material is pulverized to obtain amorphous alloy strip powder.

2. The method for preparing amorphous alloy strip powder according to claim 1, characterized in that, In step S3, the feed rate of the hydrogen-absorbing amorphous ribbon into the air jet mill is 1 kg / h to 20 kg / h, the pulverizing gas pressure inside the air jet mill is 0.6 MPa to 1.2 MPa, the classifier rotation speed is 3000 rpm to 8000 rpm, and the inert gas flow rate is ≥20 Nm³. 3 / h.

3. The method for preparing amorphous alloy strip powder according to claim 1, characterized in that, In step S4, the vacuum is evacuated to 0 to 5 degrees Celsius before the dehydrogenation step. 10 -3 Pa, the vacuum degree of the constant pressure stage of the dehydrogenation step is 0 to 0.2 Pa.

4. The method for preparing amorphous alloy strip powder according to claim 1, characterized in that, In S5, S2 to S4 are repeated 1 to 20 times.

5. The method for preparing amorphous alloy strip powder according to claim 1, characterized in that, The steps preceding S1 include: S0-1: Take a soft magnetic composite material and melt it in a vacuum under inert gas protection; S0-2: The amorphous ribbon is obtained by rapid quenching under inert gas protection, wherein the solidification cooling rate of the rapid quenching exceeds 10. 4 K / s.

6. The method for preparing amorphous alloy strip powder according to claim 5, characterized in that, In S0-1, the atomic ratio of each component of the soft magnetic composite material satisfies Fe 100-a-b-c X a Y b Z c Where 15≤a≤30, 0<b≤5, 0<c≤3, X includes one or more of Si, B and C, Y includes one or more of Mo, Zr, Ni, Ti and Cr, and Z includes one or more of rare earth elements.

7. The method for preparing amorphous alloy strip powder according to claim 1, characterized in that, The step following S6 is: S7: The amorphous alloy strip powder is surface modified under inert gas protection, and an inert reinforcement layer is deposited on the surface of the amorphous alloy strip powder.

8. The method for preparing amorphous alloy strip powder according to claim 1, characterized in that, In step S7, the inert reinforcement layer is a silicon organic coating film, a metal fluoride film, or a graphene film.

9. The method for preparing amorphous alloy strip powder according to claim 7, characterized in that, The step following S7 is: S8: The surface-modified amorphous alloy strip powder is sieved according to the particle size range under inert gas protection and then vacuum-sealed.

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