Ultrahigh-purity amorphous alloy master ingot smelting device and method

Abstract

An ultrahigh-purity amorphous alloy master ingot smelting device and method, which belong to the technical field of steelmaking. The smelting device comprises a vacuum chamber, an induction heating device (2), a vacuum feeding bin (1), gas storage tanks, a tundish (6) and a vibratory pouring platform (9). The vacuum chamber has a vacuum cavity therein; the induction heating device (2) is located in the vacuum cavity; the vacuum feeding bin (1) is in communication with the top of the induction heating device (2); the gas storage tanks are in communication with the bottom of the induction heating device (2); the tundish (6) is located in the vacuum cavity and is located on one side of the induction heating device (2), and the bottom of the tundish (6) is in communication with a flow guide pipe (7); and the vibratory pouring platform (9) is located below the tundish (6), and forming crucibles (8) are arranged on the vibratory pouring platform (9).

Description

Ultra-high purity amorphous alloy mother ingot melting device and method

[0001] This patent application claims priority to Chinese patent application No. CN 202411008395.X filed on July 26, 2024. The disclosure of the prior application is incorporated herein by reference in its entirety. Technical Field

[0002] The present application belongs to the technical field of steelmaking, and more specifically, relates to an apparatus and method for melting ultra-high purity amorphous alloy mother ingots. Background Art

[0003] Industry's requirements for material performance are increasing, especially in high-tech fields, which pose higher challenges to the purity, mechanical properties, corrosion resistance and magnetic properties of materials. Amorphous alloys, due to their excellent physical and chemical properties, have become ideal materials for various high-end applications, including but not limited to aerospace, automobile manufacturing, electronic equipment and other fields. However, the current production equipment and processes are unable to produce high-purity and excellent-performance amorphous alloy mother ingots, and traditional smelting equipment and methods have become incapable of doing so.

[0004] First, traditional smelting equipment lacks the ability to perform multiple impurity removal and purification processes, and the presence of impurities severely impacts the alloy's performance. Second, controlling the vacuum level during the alloy feeding process is challenging, making it difficult to achieve multiple, fully sealed, and airtight feeding. Furthermore, traditional casting techniques struggle to ensure alloy uniformity and stability, impacting the quality and performance of the final product.

[0005] Chinese patent application CN210220640U introduces an electromagnetic induction amorphous melting furnace, whose main feature is that it can melt and spray-cast in a vacuum or under the protection of inert gas, which can greatly reduce the operation process. However, it can only perform one-time melting and cannot perform secondary or tertiary charging without breaking the vacuum.

[0006] Chinese patent application CN200954540Y describes a ladle molten metal stirring and energizing purification device. Its main feature is the presence of a molten metal stirring and energizing purification device on the outside of the ladle. However, due to the generally high temperature inside the melting furnace, the continuous rotation leads to high pressure inside the ladle. Furthermore, due to the constant reversal of the ladle, impurities in the molten steel are easily mixed with the interior of the molten steel, making it difficult to effectively remove the impurities.

[0007] Chinese patent application CN117551897A describes a zirconium-based amorphous metallurgical purification and smelting device and method. Its key feature is that the purification and smelting device employs an electrochemical secondary removal process, removing impurities from the molten steel. However, due to the electrochemical removal method, the impurity removal rate still has significant room for improvement. Furthermore, the power supply system is complex and expensive. Technical issues

[0008] The purpose of this application is to provide an ultra-high purity amorphous alloy mother ingot melting device to solve the above problems. Technical Solutions

[0009] The purpose of this application is to provide an ultra-high purity amorphous alloy mother ingot melting device, which adopts vacuum induction melting technology, combines the two-stage process of bottom blowing melting and vibration casting, and effectively controls the atmosphere, temperature and alloy composition of the melting process by adding a tundish design, so as to effectively float impurities in the molten steel and improve the uniformity of the alloy. At the same time, the vibration casting technology is used to quickly cool the alloy and effectively remove impurity components in the alloy, further improving the performance of the product.

[0010] To achieve the above objectives, the technical solution adopted in this application is to provide an ultra-high purity amorphous alloy mother ingot melting device, comprising:

[0011] A vacuum chamber, wherein the vacuum chamber has a vacuum cavity therein;

[0012] an induction heating device, wherein the induction heating device is located in the vacuum chamber;

[0013] A vacuum feeding bin, located above the vacuum chamber and connected to the top of the induction heating device;

[0014] A gas storage tank, the gas storage tank is located below the vacuum chamber and is connected to the bottom of the induction heating device;

[0015] a tundish, the tundish being located in the vacuum chamber and on one side of the induction heating device, the bottom of the tundish being connected to a draft pipe, and the final smelt being introduced into the tundish for static placement by tilting the induction heating device;

[0016] a vibrating pouring table, the vibrating pouring table being located below the tundish and provided with a forming crucible for receiving the alloy melt flowing from the draft tube and solidifying and forming the alloy melt;

[0017] The gas storage tank includes an Ar gas cylinder and an H2 gas cylinder. The Ar gas cylinder and the H2 gas cylinder are connected in parallel and connected to the bottom of the induction heating device through a bottom blowing pipe. The gas outlet pipe of the Ar gas cylinder and the gas outlet pipe of the H2 gas cylinder are both provided with valves. The two pass through the vacuum cavity of the vacuum chamber through the same main pipeline. The main pipeline is also provided with corresponding valves. The end of the main pipeline passing through the vacuum cavity is connected to the bottom blowing pipe.

[0018] In a possible implementation, a rotating platform is provided at the upper end of the vibrating casting table, and a plurality of the forming crucibles are evenly arranged circumferentially on the upper end surface of the rotating platform for sequentially receiving the alloy melt flowing from the guide tube and solidifying and forming it.

[0019] The present application also provides a method for melting an ultra-high purity amorphous alloy mother ingot, which uses the ultra-high purity amorphous alloy mother ingot melting device, comprising the following steps:

[0020] S1: Add some pure iron and ferrosilicon into the induction heating device through the vacuum feeding bin, turn on the induction heating device and open the Ar gas cylinder separately to blow Ar gas into the bottom of the induction heating device until the alloy is melted into a primary smelting material;

[0021] S2: All the ferroboron and the remaining pure iron and ferrosilicon are added again to the primary smelting material in the induction heating device through the vacuum feeding bin, and at the same time, the Ar gas cylinder and the H2 gas cylinder are opened to blow a mixed gas consisting of Ar gas and H2 gas into the bottom of the induction heating device until the alloy is melted into the secondary smelting material;

[0022] S3: All the ferroniobium and pure copper are added to the induction heating device again through the vacuum feeding bin. After the alloy is completely melted into the final smelting material, the Ar gas cylinder is opened to blow Ar gas into the bottom of the induction heating device;

[0023] S4: The final smelt is introduced into the tundish through the tilting induction heating device for standing, and the temperature of the alloy melt in the tundish is monitored;

[0024] S5: After the temperature of the alloy melt drops to a predetermined value, the guide tube is opened and the vibrating pouring table is turned on at the same time. The alloy melt flows through the guide tube into the forming crucible for solidification and forming.

[0025] S6: When a forming crucible is filled with alloy melt, the guide tube is closed, the rotating platform rotates a certain angle to the next uncast forming crucible, and step S5 is repeated until all the forming crucibles are cast.

[0026] In a possible implementation, in step S1, the amount of pure iron added is 50% to 70%, the amount of ferrosilicon added is 30% to 50%, and the flow rate of Ar gas is 0.05 to 0.3 Nm 3 / ht, the induction heating device is heated to 1600℃, and the vacuum degree of the vacuum chamber is lower than 100Pa.

[0027] In one possible implementation, in step S2, the flow rate of the mixed gas is 0.3-0.6 Nm 3 / ht, the proportion of H2 in the mixed gas is 2% to 5%.

[0028] In one possible implementation, in step S3, the flow rate of Ar gas is 0.5-0.8 Nm 3 / ht, and maintain for 3 to 8 minutes.

[0029] In a possible implementation, in step S5, the predetermined value of the alloy melt temperature drop is 1530°C to 1550°C, and the vibration frequency of the vibrating pouring table is 50 to 200 Hz.

[0030] In a possible implementation, the purity of pure iron, ferrosilicon, ferroboron, ferroniobium and pure copper is all above 99.9%, and the purity of Ar gas and H2 gas is all above 99.9%.

[0031] In a possible implementation, the ultra-high purity amorphous alloy mother ingot melting method is applicable to an induction heating device with a capacity of 10 kg to 2 t. Beneficial effects

[0032] The beneficial effects of an ultra-high purity amorphous alloy mother ingot melting device provided by the present application are as follows: compared with the existing technology, the device adopts an induction heating device, a tundish and a vibration casting table arranged in the vacuum cavity of a vacuum chamber, and utilizes the induction heating device for vacuum induction melting, combined with bottom blowing to accurately control the melting process, and the design of the tundish is added to effectively float impurities in the alloy melt and improve the uniformity of the alloy. At the same time, the vibration casting table vacuum forming vibration casting technology is adopted, which can quickly cool the alloy and effectively remove impurity components in the alloy, further improving the performance of the product.

[0033] The beneficial effect of the ultra-high-purity amorphous alloy master ingot smelting method provided in this application is that, compared with the prior art, during the ultra-high-purity amorphous alloy master ingot smelting process, the primary smelting material, the secondary smelting material, and the final smelting material are separately smelted in an induction heating device, and the required raw materials are added sequentially according to the target alloy master ingot composition without breaking the air. While ensuring the vacuum degree, Ar gas or Ar gas and H2 gas are selectively blown from the bottom to enhance the stirring of the molten pool and uniformize the composition of the alloy melt. The alloy melt obtained in the molten pool is poured into a tundish and allowed to stand to promote the floating and removal of impurities in the melt. After the guide tube is opened to start casting, the vibrating casting table is started at the same time. The alloy melt enters the interior of multiple forming crucibles through the guide tube in sequence for solidification and forming, thereby reducing intermetallic compounds in the alloy melt and making the composition more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] FIG1 is a schematic structural diagram of an ultra-high purity amorphous alloy mother ingot melting device provided by the present application;

[0036] FIG2 is a process flow chart of a method for melting an ultra-high purity amorphous alloy mother ingot provided in this application;

[0037] FIG3 is a sampling diagram provided in Example 1 of the present application;

[0038] FIG4 is a sampling schematic diagram provided in Example 2 of the present application.

[0039] Description of reference numerals:

[0040] 1. Vacuum charging silo; 2. Induction heating device; 3. Bottom blowing pipe; 4. Ar gas cylinder; 5. H2 gas cylinder; 6. Tundish; 7. Draft tube; 8. Forming crucible; 9. Vibrating pouring table. Modes for Carrying Out the Invention

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0042] In the claims, description and above-mentioned drawings of this application, unless otherwise explicitly defined, the use of terms such as "first", "second" or "third" is for the purpose of distinguishing different objects rather than for describing a specific order.

[0043] In the claims, specification and the above-mentioned drawings of this application, unless otherwise expressly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific scope of protection of this application.

[0044] Referring to FIG1 , an ultra-high purity amorphous alloy mother ingot melting device provided by the present application is now described. The ultra-high purity amorphous alloy mother ingot melting device comprises a vacuum chamber, an induction heating device 2 , a vacuum feeding bin 1 , a gas storage tank, a tundish 6 , and a vibrating casting table 9 .

[0045] The vacuum chamber is provided with a vacuum cavity inside, the induction heating device 2 is located in the vacuum cavity, the vacuum feeding bin 1 is located above the vacuum chamber, the vacuum feeding bin 1 is connected to the top of the induction heating device 2, the gas storage tank is located below the vacuum chamber, and the gas storage tank is connected to the bottom of the induction heating device 2. The tundish 6 is located in the vacuum cavity and on one side of the induction heating device 2. The bottom of the tundish 6 is connected to the guide pipe 7. The vibration pouring table 9 is located below the tundish 6. A forming crucible 8 is provided on the vibration pouring table 9. The forming crucible 8 is used to receive the alloy melt flowing out of the guide pipe 7 and solidify it into shape.

[0046] The present application provides an ultra-high purity amorphous alloy mother ingot melting device. Compared with the existing technology, the device adopts an induction heating device 2, a tundish 6 and a vibration casting table 9 arranged in the vacuum cavity of a vacuum chamber, and utilizes the induction heating device 2 for vacuum induction melting, combined with bottom blowing to accurately control the melting process. The design of the tundish 6 is added to effectively float impurities in the alloy melt and improve the uniformity of the alloy. At the same time, the vacuum forming vibration casting technology of the vibration casting table 9 is adopted to quickly cool the alloy and effectively remove impurity components in the alloy, further improving the performance of the product.

[0047] Referring to Figure 1 , the gas storage tank includes an Ar gas cylinder 4 and an H2 gas cylinder 5. These cylinders are connected in parallel and connected to the bottom of the induction heating device 2 via a bottom blowing pipe 3. The outlet pipes of the Ar gas cylinder 4 and the H2 gas cylinder 5 are both equipped with valves. Both pipes pass into the vacuum chamber through a common main pipeline, which is also equipped with corresponding valves.

[0048] Among them, a bottom blowing pipe 3 is provided at the bottom of the induction heating device 2, and the end of the main pipeline passing through the vacuum chamber is connected to the above-mentioned bottom blowing pipe 3. Through the opening and closing state of the above-mentioned valve, Ar gas and / or H2 gas can be selectively blown into the induction heating device 2.

[0049] An induction heating device 2 utilizes the principle of electromagnetic induction to heat and melt metal materials. It primarily consists of an induction heating power supply, an inductor (coil), a cooling system, a control system, and a mechanical system. When current passes through the induction heating coil, an alternating magnetic field is generated around the coil. When a metal workpiece is placed within the coil, the alternating magnetic field generates an induced current due to the metal's electrical conductivity. This induced current encounters resistance as it flows within the metal, generating heat, as seen in an induction heating furnace.

[0050] Furthermore, a rotating platform is installed at the top of the vibrating pouring table 9. Multiple forming crucibles 8 are evenly arranged around the top surface of the rotating platform, sequentially receiving the molten alloy flowing from the flow tube 7 and solidifying and shaping it. In the rotating platform's initial state, the lower end of the flow tube 7 is directly above one of the forming crucibles 8. Once pouring is complete in one of the forming crucibles 8, the rotating platform rotates a specific angle based on the number of forming crucibles 8, rotating the next adjacent forming crucible 8 to directly below the lower end of the flow tube 7. This process is repeated, completing the pouring and shaping process in all the forming crucibles 8.

[0051] Based on the same inventive concept, the present application also provides a method for melting an ultra-high purity amorphous alloy mother ingot, which uses the above-mentioned ultra-high purity amorphous alloy mother ingot melting device, comprising the following steps:

[0052] S1: Add some pure iron and ferrosilicon into the induction heating device 2 through the vacuum feeding bin 1, turn on the induction heating device 2 and open the Ar gas cylinder 4 to blow Ar gas into the bottom of the induction heating device 2 until the alloy is melted into a primary smelting material;

[0053] S2: All the ferroboron and the remaining pure iron and ferrosilicon are added again to the primary smelting material in the induction heating device 2 through the vacuum feeding bin 1, and at the same time, the Ar gas cylinder 4 and the H2 gas cylinder 5 are opened to blow a mixed gas consisting of Ar gas and H2 gas into the bottom of the induction heating device 2 until the alloy is melted into the secondary smelting material;

[0054] S3: All the ferroniobium and pure copper are added again into the induction heating device 2 through the vacuum feeding bin 1. After the alloy is completely melted into the final smelting material, the Ar gas cylinder 4 is opened to blow Ar gas into the bottom of the induction heating device 2.

[0055] S4: The final smelted material is introduced into the tundish 6 by tilting the induction heating device 2 and allowed to stand, and the temperature of the alloy melt in the tundish 6 is monitored;

[0056] S5: After the temperature of the alloy melt drops to a predetermined value, the guide tube 7 is opened, and the vibrating pouring table 9 is turned on at the same time. The alloy melt enters the forming crucible 8 through the guide tube 7 and solidifies into a shape;

[0057] S6: When one forming crucible 8 is filled with the alloy melt, the guide tube 7 is closed, the rotating platform rotates a certain angle to the next uncast forming crucible 8, and step S5 is repeated until all the forming crucibles 8 are cast.

[0058] The beneficial effect of the ultra-high-purity amorphous alloy master ingot smelting method provided in this application is that, compared with the prior art, during the ultra-high-purity amorphous alloy master ingot smelting process, the primary smelting material, the secondary smelting material, and the final smelting material are smelted separately in the induction heating device 2, and the required raw materials are added sequentially according to the target alloy master ingot composition without breaking the air. While ensuring the vacuum degree, Ar gas or Ar gas and H2 gas are selectively blown from the bottom to enhance the stirring of the molten pool and uniformize the composition of the alloy melt. The alloy melt obtained in the molten pool is poured into a tundish 6 and allowed to stand to promote the floating and removal of impurities in the melt. After the guide tube 7 is opened to start casting, the vibrating pouring table 9 is simultaneously started. The alloy melt passes through the guide tube 7 and sequentially enters the interior of multiple forming crucibles 8 for solidification and forming, thereby reducing intermetallic compounds in the alloy melt and making the composition more uniform.

[0059] In step S1, the amount of pure iron added is 50% to 70%, the amount of ferrosilicon added is 30% to 50%, and the flow rate of Ar gas is 0.05 to 0.3 Nm 3 / ht, the induction heating device 2 is heated to 1600°C, and the vacuum degree of the vacuum chamber is lower than 100Pa.

[0060] The flow rate of the mixed gas is 0.3~0.6Nm 3 / ht, the proportion of H2 in the mixed gas is 2% to 5%.

[0061] In step S3, the flow rate of Ar gas is 0.5 to 0.8 Nm 3 / ht, and maintain for 3 to 8 minutes.

[0062] In step S5 , the predetermined value of the alloy melt temperature drop is 1530° C. to 1550° C., and the vibration frequency of the vibrating pouring table 9 is 50 to 200 Hz.

[0063] The purity of pure iron, ferrosilicon, ferroboron, ferroniobium and pure copper is above 99.9%, and the purity of Ar gas and H2 gas is above 99.9%.

[0064] The method for melting ultra-high purity amorphous alloy mother ingots is applicable to an induction heating device 2 with a capacity of 10 kg to 2 t.

[0065] In this application, “Nm 3 / ht” means standard cubic meters per ton of liquid steel per hour. “Nm 3 / ht”, “t” is a variable value, specifically the capacity coefficient of the induction heating device, that is, “t” is the capacity of the molten steel in the ladle (in tons). For different ladles, the capacity t will vary accordingly. That is to say, when the capacity coefficient of the internal chamber of the induction heating device increases, the t value will increase, and the total amount of gas blown into the internal chamber of the induction heating device per hour will increase accordingly; when the capacity coefficient of the internal chamber of the induction heating device decreases, the t value will decrease, and the total amount of gas blown into the internal chamber of the induction heating device per hour will decrease accordingly. The “Nm 3 The unit " / ht" is designed to match the actual production process, which is limited by the change in the capacity of the internal chamber of the induction heating device, and is more in line with the actual situation.

[0066] Please refer to the following specific examples:

[0067] Example 1: This application was used in a 150kg vacuum melting furnace to produce 124.167kg of Fe-based amorphous alloy mother ingots, in which iron accounted for 75.8389%, silicon accounted for 12.0805%, niobium accounted for 4.0268%, boron accounted for 6.4443%, and copper accounted for 1.6107%. The purity of the industrial pure iron used was 99.99%, silicon and iron accounted for 50% each in ferrosilicon, boron accounted for 40% and iron accounted for 60% in ferroboron, and niobium accounted for 80% and iron accounted for 20% in ferroniobium. The purity of the pure copper was 99.99%. The specific smelting steps were as follows:

[0068] Step ①: Before smelting begins, place the first part of raw materials: 65.9169 kg of industrial pure iron and 15 kg of ferrosilicon at the bottom of the smelting crucible of the induction heating device 2, seal the vacuum furnace cover of the induction heating device 2 and turn on the vacuum pump. At the same time, turn on the heating power of the induction heating device 2 and blow Ar gas from the bottom. The flow rate of Ar gas is controlled to 0.2 Nm 3 / ht, when the temperature rises to 1600℃ or when it is kept warm for a period of time, all the alloys are melted, and the vacuum degree is controlled at around 50Pa with a deviation of no more than 10Pa.

[0069] Step 2: After all the smelting materials are melted, 20kg of ferroboron and 15kg of ferrosilicon are added to the molten pool of the induction heating device 2 through the vacuum feeding bin 1. This process ensures that the pressure in the vacuum chamber is stable, and the bottom blowing gas is switched to Ar gas + H2 gas. The flow rate of the bottom blowing mixed gas is controlled to 0.4Nm 3 / ht, H2 accounts for 2.5% in the mixed gas.

[0070] Step 3: After all the secondary smelting materials are melted, add 6.25kg of ferroniobium and 2kg of pure copper into the molten pool of the induction heating device 2 through the vacuum feeding bin 1. This process ensures that the pressure in the vacuum chamber is stable. After all the alloys are melted, the bottom blowing gas is switched to Ar gas, and the bottom blowing flow rate is controlled at 0.7Nm 3 / ht, maintain for 8 minutes.

[0071] Step ④: Pour the alloy melt obtained in step ③ into the tundish 6 by tilting the crucible and let it stand to promote the removal of impurities in the melt while monitoring the temperature of the alloy melt.

[0072] Step 5: When the temperature of the alloy melt drops to 1530°C, open the guide tube 7 to start casting, and start the vibrating pouring table 9 at the same time. The alloy melt enters the forming crucible 8 through the guide tube 7 to solidify and cool. During this process, the frequency of the vibrating pouring table 9 is controlled at 150Hz.

[0073] Step 6: When one forming crucible 8 is filled with the melt, the guide tube 7 is closed, the rotating platform is rotated 60° to the next adjacent uncast forming crucible 8, and the step 5 operation is repeated.

[0074] Refer to Figure 3. After casting, samples were taken at 3cm, 5cm, 7cm, and 9cm from the edge of the ingot to avoid any influence from the external environment. The samples were labeled #1, #2, #3, and #4, respectively.

[0075] The alloy master ingots obtained from the smelting of the Fe-based amorphous alloy master ingots used in this application were tested for composition. Samples #1, #2, #3, and #4 all had the same elemental composition, consisting of Fe, Si, Nb, B, and Cu. The relative contents of each element were roughly the same, with the following content:

[0076] #1: [%Fe]=75.8370, [%Si]=12.0790, [%Nb]=4.0252, [%B]=6.4210, [%Cu]=1.5821;

[0077] #2: [%Fe]=75.7960, [%Si]=12.0450, [%Nb]=4.0162, [%B]=6.4140, [%Cu]=1.5651;

[0078] #3: [%Fe]=75.8040, [%Si]=12.0621, [%Nb]=4.0187, [%B]=6.4136, [%Cu]=1.5658;

[0079] #4: [%Fe]=75.8230, [%Si]=12.0561, [%Nb]=4.0137, [%B]=6.4256, [%Cu]=1.5790.

[0080] When the device of the present application is used to melt ultra-high-purity Fe-based amorphous alloy, the total oxygen content of the final molten steel is 3 ppm, the nitrogen content is controlled at 5 ppm, and the deviation of the same element in the smelted alloy mother ingot at different positions in the alloy does not exceed 0.05%. The application of this method greatly improves the uniformity and purity of the alloy mother ingot.

[0081] Example 2: This application is used in a 150kg vacuum melting furnace to produce a 128kg Co-based amorphous alloy mother ingot, in which cobalt accounts for 62.5%, iron accounts for 18.125%, silicon accounts for 7.0312%, boron accounts for 7.0312%, niobium accounts for 3.75%, and copper accounts for 1.5625%. In the cobalt iron used, cobalt accounts for 80% and iron accounts for 20%. In the ferroboron used, boron accounts for 90% and iron accounts for 10%. In the ferrosilicon used, silicon accounts for 90% and iron accounts for 10%. In the ferroniobium used, niobium accounts for 80% and iron accounts for 20%. The purity of the pure copper used must reach 99.9%. The specific smelting steps are as follows:

[0082] Step ①: Before smelting begins, place 75 kg of cobalt iron at the bottom of the smelting crucible of the induction heating device 2, seal the vacuum furnace cover of the induction heating device 2 and turn on the vacuum pump. At the same time, turn on the heating power of the induction heating device 2 and blow Ar gas from the bottom. The flow rate of Ar gas is controlled to 0.3 Nm 3 / ht, when the temperature rises to 1600℃ or when it is kept warm for a period of time, all the alloys are melted, and the vacuum degree is controlled at around 40Pa with a deviation of no more than 10Pa.

[0083] Step 2: After all the smelting materials are melted, 10kg of ferroboron and 10kg of ferrosilicon are added to the molten pool of the induction heating device 2 through the vacuum feeding bin 1. This process ensures that the pressure in the vacuum chamber is stable, and the bottom blowing gas is switched to Ar gas + H2 gas. The flow rate of the bottom blowing mixed gas is controlled to 0.4Nm 3 / ht, H2 accounts for 2.5% in the mixed gas.

[0084] Step 3: After all the secondary smelting materials are melted, add 6kg of ferroniobium, 2kg of pure copper and the remaining 25kg of ferrocobalt into the molten pool of the induction heating device 2 through the vacuum feeding bin 1. This process ensures that the pressure in the vacuum chamber is stable. After all the alloys are melted, the bottom blowing gas is switched to Ar gas, and the bottom blowing flow rate is controlled at 0.7Nm 3 / ht, maintain for 7 minutes.

[0085] Step ④: Pour the alloy melt obtained in step ③ into the tundish 6 by tilting the crucible and let it stand to promote the removal of impurities in the melt while monitoring the temperature of the alloy melt.

[0086] Step 5: When the temperature of the alloy melt drops to 1500°C, open the guide tube 7 to start casting, and start the vibrating pouring table 9 at the same time. The alloy melt enters the forming crucible 8 through the guide tube 7 to solidify and cool. The frequency of the vibrating pouring table 9 is controlled at 200Hz during this process.

[0087] Step 6: When one forming crucible 8 is filled with the melt, the guide tube 7 is closed, the rotating platform is rotated 60° to the next adjacent uncast forming crucible 8, and the step 5 operation is repeated.

[0088] Refer to Figure 4. After casting, samples were taken at 3cm, 5cm, 7cm, and 9cm from the bottom edge of the ingot to avoid any influence from the external environment. The samples were labeled #1, #2, #3, and #4, respectively.

[0089] The alloy mother ingot obtained by smelting the above-mentioned Co-based amorphous alloy mother ingot in this application was tested for composition. By comparison, it can be seen that the elemental compositions of samples #1, #2, #3, and #4 are consistent, namely Co, Fe, Si, Nb, B, and Cu, and the relative contents of each element are roughly the same, wherein the contents of different elemental components are as follows:

[0090] #1: [%Co]=62.4560, [%Fe]=18.1240, [%Si]=7.0314, [%Nb]=3.7467, [%B]=7.0305, [%Cu]=1.5623;

[0091] #2: [%Co]=62.4860, [%Fe]=18.1249, [%Si]=7.0298, [%Nb]=3.7487, [%B]= 7.0308, [%Cu]=1.5621;

[0092] #3: [%Co]=62.4862, [%Fe]=18.1246, [%Si]=7.0294, [%Nb]=3.7494, [%B]=6.9912, [%Cu]=1.5225;

[0093] #4: [%Co]=62.4600, [%Fe]=18.0850, [%Si]=6.9912, [%Nb]=3.7100, [%B]=6.9852, [%Cu]=1.5175.

[0094] The apparatus used in this application to melt ultra-high-purity Co-based amorphous alloys achieves a final steel melt with a total oxygen content of 3 ppm and a nitrogen content of 4 ppm. By gradually adding material, adjusting the type and flow of bottom-blowing gas, employing vacuum melting techniques, tilting and pouring, and vibratory casting, this melting apparatus effectively improves the uniformity of the steel's composition and purity. Specifically, the deviation of the same element in different locations within the smelted alloy mother ingot does not exceed 0.05%. This application utilizes these combined techniques to help produce high-quality alloy products.

[0095] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An ultra-high purity amorphous alloy mother ingot melting device, characterized in that: include: A vacuum chamber, wherein the vacuum chamber has a vacuum cavity; an induction heating device (2), the induction heating device (2) being located in the vacuum chamber; A vacuum feeding bin (1), the vacuum feeding bin (1) being located above the vacuum chamber and connected to the top of the induction heating device (2); A gas storage tank, the gas storage tank is located below the vacuum chamber and is connected to the bottom of the induction heating device (2); a tundish (6), the tundish (6) being located in the vacuum chamber and on one side of the induction heating device (2); a flow guide pipe (7) being connected to the bottom of the tundish (6); and the final smelted material being introduced into the tundish (6) and allowed to stand by tilting the induction heating device (2); a vibrating pouring table (9), the vibrating pouring table (9) being located below the tundish (6), a forming crucible (8) being provided on the vibrating pouring table (9), the forming crucible (8) being used to receive the alloy melt flowing out of the guide tube (7) and solidify and form the alloy melt; The gas storage tank comprises an Ar gas cylinder (4) and an H2 gas cylinder (5). The Ar gas cylinder (4) and the H2 gas cylinder (5) are connected in parallel and are connected to the bottom of the induction heating device (2) through a bottom blowing pipe (3). The gas outlet pipe of the Ar gas cylinder (4) and the gas outlet pipe of the H2 gas cylinder (5) are both provided with valves. The two penetrate into the vacuum cavity of the vacuum chamber through the same main pipeline. The main pipeline is also provided with corresponding valves. The end of the main pipeline penetrating into the vacuum cavity is connected to the bottom blowing pipe (3).

2. The ultra-high purity amorphous alloy mother ingot melting device according to claim 1, characterized in that: A rotating platform is provided at the upper end of the vibrating pouring table (9), and a plurality of forming crucibles (8) are evenly arranged circumferentially on the upper end surface of the rotating platform for sequentially receiving the alloy melt flowing out of the guide tube (7) and solidifying and forming the alloy melt.

3. A method for melting an ultra-high purity amorphous alloy mother ingot, characterized in that: The ultra-high purity amorphous alloy mother ingot melting device according to claim 2 is used, comprising the following steps: S1: adding a portion of pure iron and ferrosilicon into the induction heating device (2) through the vacuum feeding bin (1), turning on the induction heating device (2) and separately turning on the Ar gas cylinder (4) to blow Ar gas into the bottom of the induction heating device (2) until the alloy is melted into a primary smelting material; S2: All the ferroboron and the remaining pure iron and ferrosilicon are added again to the primary smelting material in the induction heating device (2) through the vacuum feeding bin (1), and at the same time, the Ar gas cylinder (4) and the H2 gas cylinder (5) are opened to blow a mixed gas consisting of Ar gas and H2 gas into the bottom of the induction heating device (2) until the alloy is melted into the secondary smelting material; S3: All the ferroniobium and pure copper are added again into the induction heating device (2) through the vacuum feeding bin (1). After the alloy is completely melted into the final smelting material, the Ar gas cylinder (4) is opened separately to blow Ar gas into the bottom of the induction heating device (2); S4: introducing the final smelted material into the tundish (6) by tilting the induction heating device (2) for standing, and monitoring the temperature of the alloy melt in the tundish (6); S5: After the temperature of the alloy melt drops to a predetermined value, the guide tube (7) is opened, and at the same time, the vibrating pouring table (9) is opened, and the alloy melt enters the forming crucible (8) through the guide tube (7) to be solidified and formed; S6: When a forming crucible (8) is filled with alloy melt, the guide tube (7) is closed, the rotating platform rotates a certain angle to the next uncast forming crucible (8), and step S5 is repeated until all the forming crucibles (8) are cast.

4. The method for melting an ultra-high purity amorphous alloy mother ingot according to claim 3, wherein: In step S1, the amount of pure iron added is 50% to 70%, the amount of ferrosilicon added is 30% to 50%, and the flow rate of Ar gas is 0.05 to 0.3 Nm 3 / ht, the induction heating device (2) is heated to 1600°C, and the vacuum degree of the vacuum chamber is lower than 100Pa.

5. The method for melting an ultra-high purity amorphous alloy mother ingot according to claim 3, wherein: In step S2, the flow rate of the mixed gas is 0.3-0.6 Nm 3 / ht, the proportion of H2 in the mixed gas is 2% to 5%.

6. The method for melting an ultra-high purity amorphous alloy mother ingot according to claim 3, wherein: In step S3, the flow rate of Ar gas is 0.5 to 0.8 Nm 3 / ht, and maintain for 3 to 8 minutes.

7. The method for melting an ultra-high purity amorphous alloy mother ingot according to claim 3, wherein: In step S5, the predetermined value of the alloy melt temperature drop is 1530°C to 1550°C, and the vibration frequency of the vibrating pouring table (9) is 50 to 200 Hz.

8. The method for melting an ultra-high purity amorphous alloy mother ingot according to claim 3, wherein: The purity of pure iron, ferrosilicon, ferroboron, ferroniobium and pure copper is above 99.9%, and the purity of Ar gas and H2 gas is above 99.9%.

9. The method for melting an ultra-high purity amorphous alloy mother ingot according to claim 3, wherein: The ultra-high purity amorphous alloy mother ingot smelting method is suitable for an induction heating device (2) with a capacity of 10 kg to 2 t.

Images