Aluminothermic flame cutting agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of flame cutting agents, and particularly relates to an aluminothermic flame cutting agent as well as a preparation method and application thereof. The thermit type flame cutting agent is prepared from the following raw materials in percentage by weight: 28.85 wt% of aluminum powder, 41.15 wt%-61.15 wt% of ferric oxide powder, 5 wt%-15 wt% of copper oxide powder and 5 wt%-15 wt% of bismuth oxide powder, wherein the sum of the weight percentages of the raw materials is 100%. By compounding the copper oxide powder and the bismuth oxide powder in a traditional thermit type cutting agent Al / Fe2O3 system, the obtained thermit type flame cutting agent has the characteristics of high combustion temperature, high gas yield, high combustion rate and low melting point, and overcomes the technical defects of the traditional thermit type cutting agent Al / Fe2O3 system; and the problems of low structural strength and low energy release efficiency caused by poor component contact in the prior art are solved.

Description

Technical Field

[0001] This invention belongs to the field of flame cutting agent technology, specifically an aluminothermic flame cutting agent, its preparation method, and its application. Background Technology

[0002] Flame cutting is one of the most common industrial cutting methods. It utilizes the high-temperature molten metal jet and high-pressure gas generated by the combustion of a flame cutting agent to cut metal materials. It is a cutting method without an external energy source, boasting advantages such as low cost and high economic efficiency, and is widely used in basic processing industries. For a long time, flame cutting utilized the thermochemical energy generated by gas combustion to cut and separate metal materials. Acetylene gas, as the most widely used gas cutting fuel, laid an important technological foundation for flame cutting. However, due to its high energy consumption, poor safety, and inconvenience, it has been gradually phased out. Currently used hydrogen-oxygen flames and alcohol-based fuels also pose significant safety risks.

[0003] Metastable intermolecular composite fuels consist of nanoscale fuels and oxidants, combined at the molecular level. These fuels are also known as super aluminothermic fuels or nano aluminothermic fuels. Thermite systems possess high energy density and combustion temperature, as well as good heat resistance and gas production. The cutter generates high-temperature, high-pressure gas through the combustion reaction of the aluminothermic fuel, completing the cut in the form of a high-temperature condensed phase jet, demonstrating enormous application potential.

[0004] Aluminum powder, with its advantages of high energy density and low cost, is widely used in thermite. However, due to the high oxidizing properties of Al powder, nano-Al powder has a lower active Al content than micron-sized Al powder, which is not conducive to complete energy release. As early as the 20th century, Helms conducted research on pyrotechnic cutting agents and invented an thermite-type pyrotechnic cutting agent composed of Ni, metal oxides, metal powder, and a gas-generating agent. The metal oxides are selected from Fe2O3 or Fe3O4, and the metal powders are selected from Mg, Al, Zr, or Bi. Existing thermite systems using Fe2O3 as the oxide have high combustion temperatures, fast and stable reaction rates, and have been extensively studied. However, its problems, such as difficulty in ignition, low gaseous product production during combustion, insufficient heat release, and high melting point of the liquid metal, have exacerbated slag formation on the material surface during cutting, which has limited the practical engineering application of this thermite system.

[0005] Flame cutting achieves its effect by impacting the target material with a high-speed jet of molten metal generated by the combustion of the flame cutting flux. The greater the kinetic energy of the metal jet, the lower its melting point, and the higher the gas production, the better the impact and cutting effect on the metal material. To increase the jet flow rate, the faster the molten metal jet velocity, the better. This requires adding a certain amount of gas-generating agent to the high-heat flux to generate high pressure during combustion. However, excessively high gas pressure poses an explosion risk, so a comprehensive consideration is necessary. Increasing the mass of the metal jet also increases the jet flow rate, requiring the metal density to be as high as possible when selecting the metal jet. Furthermore, a low-melting-point metal jet is crucial for suppressing slag formation. Currently, researchers both domestically and internationally have conducted extensive research on the poor cutting effect caused by slag formation in cutting fluxes. Adding auxiliary agents to increase the combustion heat of the cutting flux and lower the solidification point of the molten metal can improve the cutting performance of aluminothermic flame cutting fluxes. Furthermore, researchers have found that adding an appropriate amount of SiO2 to the Al / Fe2O3 system is beneficial for slag formation, and the resulting Fe-Si alloy has a low melting point, giving the slag a certain degree of fluidity. The reaction temperature can reach above 2000℃, sufficient to melt the Fe-Si alloy slag; the melting point of the Fe-Si alloy is 1410℃. However, the presence of SiO2 slows down the reaction process, reducing the metal jet rate and hindering cutting. Therefore, current technology lacks suitable additives to address the problems inherent in the Al / Fe2O3 system.

[0006] In addition, in the existing technology, the flame cutting agent prepared by first mixing powder by mechanical mixing and then drying has poor component contact, resulting in low structural strength and energy release efficiency. Summary of the Invention

[0007] Based on the shortcomings of the existing technology, this invention provides an aluminothermic flame cutting flux, its preparation method, and its application. The aluminothermic flame cutting flux of this invention is composed of the following raw materials by weight percentage: 28.85 wt% aluminum powder, 41.15 wt%~61.15 wt% ferric oxide powder, 5 wt%~15 wt% copper oxide powder, and 5 wt%~15 wt% bismuth oxide powder, with the sum of the weight percentages of each raw material being 100%. This invention, by compounding copper oxide powder and bismuth oxide powder in the traditional Al / Fe2O3 aluminothermic cutting flux system, results in an aluminothermic flame cutting flux with high combustion temperature, high gas production, high combustion rate, and low melting point. This overcomes the technical defects of the traditional Al / Fe2O3 aluminothermic cutting flux system and also overcomes the problems of low structural strength and low energy release efficiency caused by poor component contact in existing technologies.

[0008] Based on the above technical objectives, the present invention adopts the following technical solution: This invention protects an aluminothermic flame cutting flux, composed of the following raw materials by weight percentage: 28.85 wt% aluminum powder, 41.15 wt%~61.15 wt% ferric oxide powder, 5 wt%~15 wt% copper oxide powder, and 5 wt%~15 wt% bismuth oxide powder, with the sum of the weight percentages of each raw material being 100%. If the content of bismuth oxide powder and copper oxide powder is too low, there will be defects such as difficulty in ignition, poor fluidity of the molten metal jet, and easy solidification and slag formation; if the content of bismuth oxide powder and copper oxide powder is too high, there will be safety problems such as excessively fast burning rate and uncontrolled combustion, posing a high risk.

[0009] Preferably, the aluminum powder is selected from micron-sized aluminum powder or nano-sized aluminum powder, with the particle size of micron-sized aluminum powder being 1μm~5μm and the particle size of nano-sized aluminum powder being 200nm~500nm.

[0010] Preferably, the particle size of the ferric oxide powder is 30nm~50nm.

[0011] Preferably, the particle size of the copper oxide powder is 300nm~500nm.

[0012] Preferably, the particle size of the bismuth oxide powder is 300nm~500nm.

[0013] This invention also protects a method for preparing an aluminothermic flame cutting agent, comprising the following steps: Weigh the raw materials according to the following weight percentages: 28.85 wt% aluminum powder, 41.15 wt%~61.15 wt% ferric oxide powder, 5 wt%~15 wt% copper oxide powder, and 5 wt%~15 wt% bismuth oxide powder. The sum of the weight percentages of each raw material is 100%. Set aside for later use.

[0014] After mixing the raw materials with the grinding balls, a ball milling agent is added and the mixture is ball-milled. The ball milling agent and the grinding balls are then separated to obtain the aluminothermic flame cutting agent.

[0015] Preferably, the ball milling operation is as follows: aluminum powder, ferric oxide powder, bismuth oxide powder and copper oxide powder are added together into the ball mill jar, grinding balls and anhydrous ethanol as a grinding agent are added, and the mixture is mixed evenly; first rotate forward for 15 min to 20 min, then rotate in reverse for 15 min to 20 min, with an interval of 5 min to 10 min between forward and reverse rotation.

[0016] This invention also protects the use of aluminothermic flame cutting agents in the preparation of flame cutting agents.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides an aluminothermic flame cutting flux, composed of the following raw materials by weight percentage: 28.85 wt% aluminum powder, 41.15 wt%~61.15 wt% ferric oxide powder, 5 wt%~15 wt% copper oxide powder, and 5 wt%~15 wt% bismuth oxide powder, with the sum of the weight percentages of each raw material being 100%; wherein, the reaction between aluminum powder and Bi₂O₃ powder can release a large amount of gas and heat, serving as the main gas-generating agent; the reaction between aluminum powder, Fe₂O₃ powder, and CuO powder can generate a large amount of heat, serving as the main heat-generating agent. The reaction of the aluminothermic flame cutting flux provided by this invention mainly includes the aluminothermic reaction, namely: Compared with existing flame cutting agents, the formulation and reaction process of this invention are simpler, the components are in close contact, and it has the characteristics of high heat release rate and high gas production.

[0018] 2. Considering the dross problem caused by the high ignition temperature, low gas production, and high melting point of the metal jet in traditional aluminothermic flame cutting flux Al / Fe2O3 systems, this invention designs a quaternary aluminothermic flame cutting flux formulation with an equivalence ratio of... φ The Al / Fe2O3 quaternary aluminothermic system with a mass percentage of 1.2 was prepared, i.e., when the mass percentage of Al powder was 28.85 wt% and the mass percentage of Fe2O3 powder was 71.15 wt%. CuO, which has a low melting point and high safety, and Bi2O3, which has a high gas production, were introduced. The melting points of Fe2O3, CuO, and Bi2O3 were 1538℃, 1083℃, and 271℃, respectively. Copper oxide powder and bismuth oxide powder were used to partially replace Fe2O3 powder. The Al / Fe2O3 / CuO / Bi2O3 quaternary aluminothermic system with close component contact was prepared by mechanical solvent ball milling. Due to the introduction of CuO and Bi2O3, the melting point of the Al / Fe2O3 / CuO / Bi2O3 quaternary aluminothermic system was effectively reduced compared with the Al / Fe2O3 system.

[0019] Among them, the equivalent ratio φ This represents the composition ratio of fuel Al to oxidant Fe2O3: In the formula: (m) Al / m Fe2O3 ) ACT This indicates the actual mass ratio of fuel to oxidizer; (m Al / m Fe2O3 ) ST This indicates the mass ratio of fuel to oxidant at stoichiometric equilibrium. φ When = 1, it is a zero oxygen equilibrium, i.e., a stoichiometric equilibrium ratio; when φ When >1, there is excess fuel, resulting in a negative oxygen balance; when φ When the concentration is less than 1, the oxidant is in excess, resulting in a positive oxygen balance.

[0020] 3. The present invention has conducted research on peak pressure and pressurization rate. The results show that the aluminothermic flame cutting flux provided by the present invention has the characteristics of high combustion temperature, high gas production, high combustion rate and low melting point.

[0021] 4. The aluminothermic flame cutting agent provided by this invention has a simple formulation and is prepared by wet mechanical ball milling, which avoids the danger of possible reactions during the ball milling process. Under the premise of ensuring preparation safety, it achieves the preparation of an aluminothermic flame cutting agent with close contact of components, high gas production, high heat production rate and high combustion temperature. Attached Figure Description

[0022] Figure 1 The pressure-time curves are for the thermite cutting agent of Comparative Example 1 and the thermite flame cutting agents of Examples 1 to 3.

[0023] Figure 2 Infrared images of the combustion flames of the thermite cutting agent of Comparative Example 1 and the thermite flame cutting agents of Examples 1 to 3. Detailed Implementation

[0024] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Unless otherwise specified, the experimental methods described in the embodiments of the present invention are conventional methods.

[0025] Considering the slag buildup problem caused by the high ignition temperature, low gas production, and high melting point of the metal jet in the existing traditional aluminothermic cutting flux Al / Fe2O3 system, as well as the reduced metal jet rate and unfavorable cutting effect after adding SiO2 to the Al / Fe2O3 aluminothermic flux system, this invention uses Al / Fe2O3 as the base formula and combines it with copper oxide powder and bismuth oxide powder to overcome the defects of the Al / Fe2O3 system and solve the new problems caused by adding SiO2 to the Al / Fe2O3 aluminothermic flux system.

[0026] The aluminothermic flame cutting flux provided by this invention is prepared by mechanical ball milling, resulting in a sample with closely contacted components. Compared with the sample obtained by the traditional mechanical mixing method, it has superior structural strength, a simpler formulation, and features high heat release rate and high gas production.

[0027] The technical solution of the present invention will be further studied using examples and comparative examples. The specific research methods and results are shown below: Example 1 A method for preparing an aluminothermic flame cutting flux, in this embodiment, is a formulation with 5 wt% CuO powder and 5 wt% Bi2O3 powder added. The aluminothermic flame cutting flux formulation consists of 28.85 wt% micron-sized Al powder, 61.15 wt% Fe2O3 powder, 5 wt% CuO powder, and 5 wt% Bi2O3 powder, and includes the following steps: Weigh out 0.2885g of Al powder, 0.6115g of Fe2O3 powder, 0.05g of CuO powder, and 0.05g of Bi2O3 powder. After preliminary mixing, place the mixture into a ball mill jar. Then add 100g of stainless steel balls with a diameter of 10mm and 100g of stainless steel balls with a diameter of 5mm, and add 60mL of anhydrous ethanol as the milling solvent, ensuring the solvent completely submerges the powder and balls. Place the ball mill jar into a ball mill and rotate at 200 rpm. -1 First, rotate clockwise for 15 minutes, then counterclockwise for 15 minutes, with a 5-minute rest interval. The total ball milling time is 30 minutes to obtain a slurry. After ball milling, filter the slurry in the ball milling tank and freeze-dry for 24 hours to obtain an aluminothermic flame cutting agent.

[0028] Among them, the particle size of micron-sized Al powder is 1μm~5μm, the particle size of Fe2O3 powder is 30nm, the particle size of CuO powder is 500nm, and the particle size of Bi2O3 powder is 300nm.

[0029] Example 2 A method for preparing an aluminothermic flame cutting flux is the same as the preparation steps in Example 1, except that micron-sized Al powder is replaced with nano-sized Al powder. The aluminothermic flame cutting flux formulation consists of 28.85 wt% nano-sized Al powder, 61.15 wt% Fe2O3 powder, 5 wt% CuO powder, and 5 wt% Bi2O3 powder, and includes the following steps: Weigh out 0.2885g of Al powder, 0.6115g of Fe2O3 powder, 0.05g of CuO powder, and 0.05g of Bi2O3 powder. After preliminary mixing, place the mixture into a ball mill jar. Then add 100g of stainless steel balls with a diameter of 10mm and 100g of stainless steel balls with a diameter of 5mm, and add 60mL of anhydrous ethanol as the milling solvent, ensuring the solvent completely submerges the powder and balls. Place the ball mill jar into a ball mill and rotate at 200 rpm. -1 First, rotate clockwise for 15 minutes, then counterclockwise for 15 minutes, with a 5-minute rest interval. The total ball milling time is 30 minutes to obtain a slurry. After ball milling, filter the slurry in the ball milling tank and freeze-dry for 24 hours to obtain an aluminothermic flame cutting agent.

[0030] Among them, the particle size of nano-sized Al powder is 500nm, the particle size of Fe2O3 powder is 30nm, the particle size of CuO powder is 500nm, and the particle size of Bi2O3 powder is 300nm.

[0031] Example 3 A method for preparing an aluminothermic flame cutting flux, in this embodiment, is a formulation with 10 wt% CuO powder and 10 wt% Bi2O3 powder added. The aluminothermic flame cutting flux formulation consists of 28.85 wt% micron-sized Al powder, 51.15 wt% Fe2O3 powder, 10 wt% CuO powder, and 10 wt% Bi2O3 powder, and includes the following steps: Weigh out 0.2885g of Al powder, 0.5115g of Fe2O3 powder, 0.1g of CuO powder, and 0.1g of Bi2O3 powder. After preliminary mixing, place the mixture into a ball mill jar. Then add 100g of stainless steel balls with a diameter of 10mm and 100g of stainless steel balls with a diameter of 5mm, and add 60mL of anhydrous ethanol as the milling solvent, ensuring the solvent completely submerges the powder and balls. Place the ball mill jar into a ball mill and rotate at 200 rpm. -1 First, rotate clockwise for 15 minutes, then counterclockwise for 15 minutes, with a 5-minute rest interval. The total ball milling time is 30 minutes to obtain a slurry. After ball milling, filter the slurry in the ball milling tank and freeze-dry for 24 hours to obtain an aluminothermic flame cutting agent.

[0032] Among them, the particle size of micron-sized Al powder is 1μm~5μm, the particle size of Fe2O3 powder is 30nm, the particle size of CuO powder is 500nm, and the particle size of Bi2O3 powder is 300nm.

[0033] Example 4 A method for preparing an aluminothermic flame cutting flux, in this embodiment, is a formulation with 15 wt% CuO powder and 15 wt% Bi2O3 powder added. The aluminothermic flame cutting flux formulation consists of 28.85 wt% micron-sized Al powder, 41.15 wt% Fe2O3 powder, 15 wt% CuO powder, and 15 wt% Bi2O3 powder, and includes the following steps: Weigh out 0.2885g of Al powder, 0.4115g of Fe2O3 powder, 0.15g of CuO powder, and 0.15g of Bi2O3 powder. After preliminary mixing, place the mixture into a ball mill jar. Then add 100g of stainless steel balls with a diameter of 10mm and 100g of stainless steel balls with a diameter of 5mm, and add 60mL of anhydrous ethanol as the milling solvent, ensuring the solvent completely submerges the powder and balls. Place the ball mill jar into a ball mill and rotate it at 200 rpm. -1 The ball milling process involves rotating the mill clockwise for 20 minutes, then counterclockwise for 20 minutes, with a 10-minute rest interval, for a total milling time of 40 minutes to obtain a slurry. After milling, the slurry in the milling tank is filtered and freeze-dried for 24 hours to obtain an aluminothermic flame cutting agent.

[0034] Among them, the particle size of nano-sized Al powder is 200nm, the particle size of Fe2O3 powder is 50nm, the particle size of CuO powder is 300nm, and the particle size of Bi2O3 powder is 500nm.

[0035] Comparative Example 1 A method for preparing an aluminothermic cutting flux, the comparative example being a traditional aluminothermic cutting flux formulation, wherein the aluminothermic cutting flux formulation comprises 28.85 wt% micron-sized Al powder and 71.15 wt% Fe2O3 powder, comprising the following steps: Weigh 0.2885g of Al powder and 0.7115g of Fe2O3 powder, mix them initially, and then place them into a ball mill jar. Next, add 100g of stainless steel balls with a diameter of 10mm and 100g of stainless steel balls with a diameter of 5mm, and add 60mL of anhydrous ethanol as the milling solvent, ensuring the solvent completely submerges the powder and balls. Place the ball mill jar into a ball mill and rotate it at 200 r / min. -1 First, rotate clockwise for 15 minutes, then counterclockwise for 15 minutes, with a 5-minute rest interval. The total ball milling time is 30 minutes to obtain a slurry. After ball milling, filter the slurry in the ball milling tank and freeze-dry for 24 hours to obtain the aluminothermic cutting agent.

[0036] Among them, the particle size of micron-sized Al powder is 1μm~5μm, and the particle size of Fe2O3 powder is 30nm.

[0037] Comparative Example 2 A method for preparing an aluminothermic cutting flux, wherein the comparative example is an Al / Fe2O3 / CuO aluminothermic cutting flux, and the aluminothermic cutting flux formulation consists of 28.85 wt% micron-sized Al powder, 56.15 wt% Fe2O3 powder and 15 wt% CuO powder, comprising the following steps: Weigh out 0.2885g of Al powder, 0.5615g of Fe2O3 powder, and 0.15g of CuO powder. After preliminary mixing, place the mixture into a ball mill jar. Then add 100g of stainless steel balls with a diameter of 10mm and 100g of stainless steel balls with a diameter of 5mm, and add 60mL of anhydrous ethanol as the milling solvent, ensuring the solvent completely submerges the powder and balls. Place the ball mill jar into a ball mill and rotate it at 200 rpm. -1 First, rotate clockwise for 15 minutes, then counterclockwise for 15 minutes, with a 5-minute rest interval. The total ball milling time is 30 minutes to obtain a slurry. After ball milling, filter the slurry in the ball milling tank and freeze-dry for 24 hours to obtain the aluminothermic cutting agent.

[0038] Among them, the particle size of micron-sized Al powder is 1μm~5μm, the particle size of Fe2O3 powder is 30nm, and the particle size of CuO powder is 500nm.

[0039] Examples 1 to 4 of this invention all yielded aluminothermic flame cutting agents with excellent structural strength and energy release rate. The following research uses the aluminothermic flame cutting agents of Examples 1 to 3 and Comparative Examples 1 to 2 as examples. Specific research methods and results are shown below: The pressure change and combustion process of the aluminothermic cutting fluxes of Comparative Examples 1-2 and the aluminothermic flame cutting fluxes of Examples 1-3 were measured using a closed burster and pressure sensor. The corresponding pressurization rates and maximum combustion temperatures were obtained. The experimental results of peak pressure, pressurization rate, and combustion temperature are shown in Table 1. The pressure-time curves and infrared spectra of the combustion flames of the aluminothermic cutting flux of Comparative Example 1 and the aluminothermic flame cutting fluxes of Examples 1-3 are shown in Table 1. Figure 1 and Figure 2 As shown.

[0040] Table 1. Comparison of experimental results between Comparative Examples 1-2 and Examples 1-3 Based on the experimental results above, compared with the aluminothermic cutting flux of Comparative Example 1, the addition of 5 wt% CuO powder and 5 wt% Bi2O3 powder in Examples 1 and 2 resulted in higher gas production, gas production rate, and combustion temperature for the aluminothermic flame cutting flux. These conditions are highly beneficial for eliminating the "slag" phenomenon during the cutting process, demonstrating better cutting performance than traditional aluminothermic cutting fluxes. Specifically, compared with Example 1, nano-Al powder resulted in a faster pressurization rate and combustion rate in Example 2, but its combustion temperature and peak pressure were lower. The performance improvement achieved by adding 10 wt% to 15 wt% CuO powder and 10 wt% to 15 wt% Bi2O3 powder in Examples 3 and 4 further demonstrates their effect on improving the gas production and energy release rate of the aluminothermic cutting flux. Compared with Comparative Example 2, CuO powder mainly plays a role in the gas generation of the aluminothermic cutting flux in Example 1; compared with Comparative Example 2, Bi2O3 powder in Example 4 shows that it focuses on both gas generation and the increase of combustion temperature, and its low melting point helps to reduce the "slag" phenomenon.

[0041] Figure 1 This is a comparison graph showing the pressure change over time of the aluminothermic cutting flux of Comparative Example 1 and the aluminothermic flame cutting fluxes of Examples 1-4 under a 3MPa argon atmosphere. Figure 1As can be seen, the peak pressure of the aluminothermic cutting flux in Comparative Example 1 was the lowest, at 4.07 MPa. However, in the aluminothermic flame cutting fluxes with different amounts of Bi₂O₃ and CuO added (ranging from 5 wt% to 15 wt%), the peak pressures of Examples 1 to 4 all showed varying degrees of increase, reaching 4.47 MPa, 4.25 MPa, 4.59 MPa, and 4.74 MPa, respectively. This indicates that Bi₂O₃ and CuO can increase the gas production of the Al / Fe₂O₃ aluminothermic flux.

[0042] Figure 2 Infrared radiation images of the combustion flames of the thermite cutting agents of Comparative Examples 1-2 and Examples 1-4 are shown. The right side of the image displays flame radiation color bars, reflecting the flame radiation intensity in this frame. Emissivity and refractive index are calculated based on temperature changes synchronously measured by thermocouples, and the corresponding combustion temperature is then obtained. Figure 2 As can be seen from the data, the combustion temperature of the thermite cutting flux in Comparative Example 1 was 2083.6℃, ​​and the combustion temperature of Comparative Example 2, which added 15wt% CuO, was 2143.4℃. From the combustion temperatures of Examples 1 to 4, it can be seen that the combustion temperature increases with the increase of Bi2O3 and CuO content. In particular, the combustion temperatures of Examples 1 and 2 show that compared with micron Al powder, nano aluminum powder reduces the combustion temperature of the thermite flux.

[0043] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An aluminothermic flame cutting agent, characterized in that, The aluminum powder is selected from micron aluminum powder or nanometer aluminum powder, the particle size of the micron aluminum powder is 1-5 microns, and the particle size of the nanometer aluminum powder is 200-500 nanometers.

2. The aluminothermic flame cutting agent of claim 1, wherein, The particle size of the diiron trioxide powder is 30-50 nanometers.

3. The aluminothermic flame cutting agent of claim 1, wherein, The particle size of the copper oxide powder is 300-500 nanometers.

4. The aluminothermic flame cutting agent of claim 1, wherein, The particle size of the bismuth oxide powder is 300-500 nanometers.

5. The aluminothermic flame cutting agent of claim 1, wherein, The method comprises the following steps:

6. A method of preparing the thermit flame cutting agent according to claim 1, characterized in that, The raw materials are weighed according to the following weight percentages: 28.85% of aluminum powder, 41.15-61.15% of diiron trioxide powder, 5-15% of copper oxide powder, and 5-15% of bismuth oxide powder, and the sum of the weight percentages of the raw materials is 100%. The raw materials are mixed with the grinding balls, the ball mill agent is added and ball milling is performed, and then the ball mill agent and the grinding balls are separated to obtain the thermite type flame cutting agent. The operation of the ball milling is as follows: the aluminum powder, the diiron trioxide powder, the bismuth oxide powder and the copper oxide powder are jointly added into a ball mill tank, the grinding balls and the ball mill agent anhydrous ethanol are added, and then they are uniformly mixed; first, the normal rotation is performed for 15-20 minutes, and then the reverse rotation is performed for 15-20 minutes.

7. The method for preparing the aluminothermic flame cutting flux according to claim 6, characterized in that, 8. Use of the thermite type flame cutting agent in claim 1 in the preparation of a flame cutting agent. ​

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