Copper alloy nano-insulated bonding wire and preparation method thereof

Abstract

The invention discloses a copper alloy nano-insulated bonding wire and a preparation method thereof, and relates to the technical field of bonding wires. The crucible mechanism of the device is provided with a main crucible and a sub-crucible, which form a combined crucible and slightly increase the height of the entire crucible. The splashing caused by palladium falling into the molten metal will not fly to the outside of the crucible, and the sub-crucible will also protect the molten metal during subsequent stirring to prevent the molten metal from splashing, and also prevent the splashing from causing an incorrect metal ratio that affects the quality of the finished product. At the same time, when the sub-crucible moves toward the main crucible, the piston in the gas tank will be pulled up through the component, and the gas will be allowed to enter the air pipe while compressing the spring. Later, when the sub-crucible moves in the opposite direction to restore its position, the spring rebounds and injects the gas in the gas tank into the output pipe through the air pipe, squeezing part of the molten metal remaining in the output pipe into the next process, ensuring that there is no molten metal residue in the output pipe, and preventing the molten metal from remaining in the output pipe and solidifying, causing the output pipe to be blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of bonding wires, in particular to a copper alloy nano insulating bonding wire and a preparation method thereof. Background Art

[0002] As an important basic material for semiconductor packaging, bonding wire determines the development level of integrated circuits. The alloy wire required for bonding wire needs to have good mechanical strength, good ball-forming properties, good bonding properties, and easy operation and welding. Silver bonding wire meets the above requirements. After the metal is melted, crystallization will occur during the cooling process, forming a crystalline region in the structure. The bonding wire is oriented during the cold drawing process, and the crystallinity gradually increases. The difference in the elongation ability of the crystalline region and the amorphous region will cause tiny cracks to appear at the interface between the crystalline region and the amorphous region. As the bonding wire is pulled thinner and reaches the nanometer level, these microcracks will be magnified. In order to avoid the above problems, it is usually cast into alloy ingots in a magnetic field, so that the alloy ingots are crystallized and oriented under the action of the magnetic field to avoid the above problems. Then, an insulating layer is coated on the outside of the nano bonding wire to achieve the insulation effect.

[0003] However, in the actual preparation process of nano copper alloy bonding wire, palladium needs to be added to copper to melt it into a copper alloy. The ordinary production process is to fix copper and palladium together and put them into a crucible for melting and mixing to form a copper alloy. However, the melting point of copper is 1083 degrees, and the melting point of palladium is 1552 degrees, which is nearly 500 degrees Celsius. If the two metals have significantly different melting points, melting them together may cause one metal to melt before the other metal melts, which may cause uneven composition of the alloy and affect the quality of the finished product. At the same time, the high melting point will also cause oxidation loss during the melting process. In order to avoid the above operation, it is usually adopted to melt the copper first and then add palladium to the copper. This can ensure that the high melting point metal has enough time and temperature to fully dissolve and mix together, thereby obtaining a more uniform alloy composition. For the sake of melting efficiency, The selected crucible is selected based on the volume of the metal to be melted, so that the liquid metal level is close to the upper end of the crucible, which can ensure the stability and efficiency of the melting process. However, when palladium is added, the palladium is still in solid form, so the palladium is put into the crucible, which may cause the copper liquid in the crucible to splash. After the palladium is added, the metal level rises. When the metal liquid is stirred later, it is too close to the upper end of the crucible, which will also cause the metal liquid to splash, which will cause waste. The splashing will reduce the content of a certain metal in the metal liquid, thereby causing the alloy ratio inside the copper alloy ingot to be incorrect, reducing the quality of the finished product. However, if a larger crucible is used to make the metal liquid level too lower than the upper end, the efficiency of the first step of melting will be reduced. Therefore, those skilled in the art have proposed copper alloy nano insulating bonding wires and preparation methods thereof. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a copper alloy nano-insulated bonding wire and a preparation method thereof, which solves the problems in the above background.

[0005] To achieve the above objectives, the present invention is implemented through the following technical scheme: copper alloy nano-insulated bonding wire, the bonding copper alloy wire contains the following weight ratios by weight percentage: 100 parts of copper, 0.5-1.5 parts of palladium, 100 parts of copper, and 1 part of palladium are respectively located in a main crucible and a secondary crucible. In the first stage, when melting copper, it is melted in the main crucible. During the copper melting process, the palladium is preheated in the secondary crucible. In the second stage, the secondary crucible is moved to the upper end of the main crucible so that the two form a combined crucible, and the preheated palladium particles in the secondary crucible are allowed to fall into the metal liquid in the main crucible, realizing the operation of first melting the low-melting-point metal and then gradually adding the high-melting-point metal.

[0006] As a further technical solution of the present invention, the method is implemented using copper alloy bonding wire preparation equipment, and the copper alloy bonding preparation equipment includes a heating furnace, a crucible mechanism, a gas injection mechanism, a moving mechanism and a stirring mechanism. The crucible mechanism is provided inside the heating furnace, the gas injection mechanism is provided on the side of the heating furnace, the moving mechanism is provided on the upper surface of the heating furnace, and the stirring mechanism is provided on the moving mechanism. The heating furnace is used to heat the metal in the crucible mechanism, the moving mechanism is used to move the stirring mechanism, the stirring mechanism is used to stir the metal liquid in the crucible mechanism, and the gas injection mechanism is used to inject gas into the output pipe. It is characterized in that the crucible mechanism includes a main crucible and a sub-crucible mechanism adapted thereto. When a part of the metal is melted in the main crucible, the sub-crucible assembly moves toward the main crucible through a hydraulic rod so that the two form a new crucible. Then the sub-crucible assembly opens to allow the preheated metal inside it to enter the originally molten metal liquid.

[0007] As a further technical solution of the present invention, the crucible mechanism includes a main crucible located at the center of the bottom surface of the heating furnace, a hydraulic rod is installed on the side of the heating furnace above the main crucible, the end of the hydraulic rod extends to the interior of the heating furnace and is installed with a sub-crucible whose lower end is in the same plane as the upper end of the main crucible, and two sealing plates are correspondingly provided inside the sub-crucible, a first gear is rotatably installed on the side of the sub-crucible, and two first racks are installed on the side of the sub-crucible for sliding up and down, both of which are engaged with the first gear, one end of each of the first racks is installed on one side of the sub-crucible, one side of each of the sealing plates extends to the outside of the sub-crucible and is fixedly connected to the adjacent L-shaped plate, a second gear is installed on the side of the first gear, and a second rack is provided on one side of the second gear that is engaged with it, and an output pipe extending to the outside of the heating furnace is installed on the inner bottom surface of the main crucible, and a first valve is installed on the output pipe near the heating furnace.

[0008] As a further technical solution of the present invention, the gas injection mechanism includes a mounting plate installed on the side of the heating furnace on the hydraulic rod, a gas tank is installed on the lower surface of the mounting plate, a piston is slidingly arranged in the gas tank, a spring is arranged above the piston inside the gas tank, an air pipe with one end connected to the output pipe is installed on the inner bottom surface of the gas tank, a second valve is installed on the air pipe near the output pipe, an air inlet pipe is installed on one side of the air pipe on the inner bottom surface of the gas tank, a one-way valve is provided on the air inlet pipe, and an open pipe is installed on the side of the gas tank near the upper end.

[0009] As a further technical solution of the present invention, two rectangular blocks are installed on the upper surface of the mounting plate corresponding to one side of the gas tank, and a winding rod is rotatably installed between the two rectangular blocks. A fixed pulley is installed on the upper surface of the mounting plate just above the gas tank, and a steel wire rope with one end passing around the fixed pulley and fixedly connected to the winding rod is installed at the center of the upper surface of the piston. One end of the winding rod passes through the rectangular block and is installed with a third gear. A third rack is placed horizontally and meshed with the third gear on one side of the third gear, and an L-shaped frame is installed on one end of the third rack. One end of the L-shaped frame extends to the inside of the heating furnace and is fixedly connected to the auxiliary crucible.

[0010] As a further technical solution of the present invention, the moving mechanism includes a moving seat installed on the upper surface of the heating furnace, a moving groove is opened on the side of the moving seat, a first motor is installed on the upper end of the moving seat, the driving end of the first motor extends into the moving groove and is installed with a screw whose other end is rotatably connected to its inner wall, and a threaded seat is provided on the screw.

[0011] As a further technical solution of the present invention, the stirring mechanism includes a side plate installed on the side of the threaded seat, a second motor is installed on the upper surface of the side plate directly above the heating furnace, a round rod is installed on the driving end of the second motor, and a plurality of evenly distributed stirring blades are installed on the side of the round rod near the lower end, the upper end of the second rack extends to the outside of the heating furnace and is fixedly connected to the lower surface of the side plate, a protective gas tank is installed on the side of the heating furnace above the hydraulic rod, a vacuum tube is installed on one side of the protective gas tank on the other side of the heating furnace, and a furnace door is provided on the front surface of the heating furnace.

[0012] The specific steps include:

[0013] S1. Connect the vacuum tube to the vacuum generator, connect the protective gas tank to the output end of the inert gas delivery device, open the furnace door, put a certain amount of copper into the main crucible, put a certain amount of palladium into the auxiliary crucible, then close the furnace door, run the vacuum generator to create a vacuum inside the heating furnace, and then deliver the inert gas into the heating furnace through the inert gas delivery device;

[0014] S2. The heating furnace is operated to heat the interior thereof to 1,083 degrees Celsius, and the copper in the main crucible slowly melts into liquid. Then, the first motor is operated to drive the screw to rotate. The rotating screw drives the threaded seat to descend. The descending threaded seat drives the round rod to descend through the side plate, causing the stirring blades to enter the main crucible. Then, the second motor is operated to drive the stirring blades to rotate through the round rod to stir the metal liquid in the main crucible, accelerating the dissolution of the copper.

[0015] S3. At the same time, the high temperature in the heating furnace will also preheat the palladium in the auxiliary crucible. When the copper in the main crucible is completely melted into liquid, the first motor drives the screw to reverse. Through the above operation, the stirring blade is raised and moved out of the main crucible. Then, the hydraulic rod is extended to drive the auxiliary crucible to move toward the main crucible until the auxiliary crucible moves to the upper end of the main crucible and is aligned with it. The first motor is driven to rotate the screw again. Through the above operation, the side plate is lowered. The lowered side plate drives the stirring blade to descend and also drives the second rack to descend.

[0016] S4, the descending second rack meshes with the second gear to rotate the second gear, and the rotating second gear drives the first gear to rotate and drive the two first racks to move toward each other, thereby driving the two L-shaped plates to move away from each other, driving the two sealing plates to move away from each other, so that the auxiliary crucible is opened, and the palladium particles in the auxiliary crucible fall into the molten metal in the main crucible. When the second rack that continues to descend is disengaged from the second gear, the lower port of the auxiliary crucible is completely opened, and then the round rod that continues to descend drives the stirring blade to pass through the auxiliary crucible and enter the main crucible. Since the auxiliary crucible is placed on the upper port of the main crucible to form a combined crucible, the height of the upper port of the entire crucible is slightly increased, and the molten metal splashed by the palladium particles falling into the molten metal will not splash to the outside due to the obstruction of the auxiliary crucible;

[0017] S5. Raise the temperature in the heating furnace to 1552°C to melt the palladium. Then, operate the second motor to drive the stirring blade to rotate and stir the molten metal in the combined crucible to mix it evenly. Even if the addition of liquid causes the original molten metal to rise, the presence of the auxiliary crucible slightly raises the height of the upper end of the crucible, which prevents the molten metal from splashing out during stirring.

[0018] S6. When the hydraulic rod extends to move the auxiliary crucible, it also drives the third rack to move through the L-shaped frame. The moving third rack drives the third gear to rotate. The rotating third gear drives the winding rod to rotate and wind the wire rope to pull the piston upward. The rising piston compresses the spring while allowing air to enter the area below the piston in the gas tank through the air inlet pipe.

[0019] S7. After the combined crucible and the molten metal are evenly mixed, the first valve is opened to allow the copper alloy molten metal to flow through the output pipe into the next process to be cast into an alloy ingot in the magnetic field. After the molten metal in the combined crucible has flowed out, the first valve is closed, and the first motor drives the screw to reverse. Through the above operation, the side plate is raised, and the round rod and the second rack are driven to rise. After the raised second rack is engaged with the second gear, the second gear is driven to reverse through the above operation, so that the two sealing plates approach each other until they contact each other. The raised round rod drives the stirring blade to move out of the combined crucible.

[0020] S8. Open the second valve to shorten the hydraulic rod and drive the auxiliary crucible to move. The moving auxiliary crucible drives the third rack to move in the opposite direction through the L-shaped frame. The winding rod is unfolded through the rising operation, and the pull on the piston is released. The spring rebounds and drives the piston to descend. The descending piston presses the gas below the gas tank into the gas pipe. The gas then enters the output pipe, and the gas squeezes part of the molten metal remaining in the output pipe into the next process to ensure that there is no molten metal residue in the output pipe. The operation is completed. Beneficial effects

[0021] The present invention provides a copper alloy nano-insulated bonding wire and a preparation method thereof. Compared with the prior art, it has the following advantages:

[0022] 1. Copper alloy nano-insulated bonding wire and preparation method thereof. The crucible mechanism of the device is provided with a main crucible and a sub-crucible. In the first stage, copper is melted in the main crucible. At this time, the crucible solvent is adapted to the copper liquid so that the copper liquid level is close to the upper end of the crucible, which will not affect the melting efficiency. In the second stage of melting, the sub-crucible is moved to the upper end of the main crucible so that the two form a combined crucible, slightly increasing the height of the entire crucible. Then, the palladium particles in the sub-crucible are allowed to fall into the metal liquid in the main crucible. Due to the obstruction of the sub-crucible, the splashes caused by the palladium falling into the metal liquid will not fly outside the crucible, and the sub-crucible will also protect the metal liquid during the subsequent stirring of the metal liquid to prevent the metal liquid from splashing, thereby avoiding the waste of metal liquid. Avoid splashing to cause incorrect metal proportions that affect the quality of the finished product, and first melt the low-melting-point metal and then gradually add the high-melting-point metal. This ensures that the high-melting-point metal has enough time and temperature to fully dissolve and mix together, thereby obtaining a more uniform alloy composition. At the same time, when the auxiliary crucible moves toward the main crucible, the piston in the gas tank will be pulled up through the component, and the gas will enter the air pipe while compressing the spring. Later, when the auxiliary crucible moves in the opposite direction to restore its position, the spring rebounds and injects the gas in the gas tank into the output pipe through the air pipe, squeezing some of the molten metal remaining in the output pipe into the next process, ensuring that there is no molten metal residue in the output pipe, and avoiding the molten metal remaining in the output pipe and solidifying, causing blockage of the output pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1Schematic diagram of the structure of copper alloy nano insulating bonding wire and its preparation method;

[0024] Figure 2 for Figure 1 Enlarged view of part A;

[0025] Figure 3 A cross-sectional view of a copper alloy nano-insulated bonding wire and a preparation method thereof;

[0026] Figure 4 for Figure 3 Enlarged view of part B;

[0027] Figure 5 A cross-sectional view of a copper alloy nano-insulated bonding wire and a preparation method thereof in working state;

[0028] Figure 6 Schematic diagram of the internal structure of copper alloy nano insulating bonding wire and its preparation method;

[0029] Figure 7 A cross-sectional view of a moving mechanism of a copper alloy nano-insulated bonding wire and a preparation method thereof;

[0030] Figure 8 Schematic diagram of the stirring mechanism structure of the copper alloy nano insulating bonding wire and its preparation method;

[0031] Figure 9 This is a schematic diagram of the partial structure of the crucible mechanism of the copper alloy nano insulating bonding wire and its preparation method.

[0032] In the figure: 1. Heating furnace; 2. Main crucible; 3. Auxiliary crucible; 4. Sealing plate; 5. First gear; 6. First rack; 7. L-shaped plate; 8. Second gear; 9. Second rack; 10. Hydraulic rod; 11. Mounting plate; 12. Gas tank; 13. Piston; 14. Spring; 15. Rectangular block; 16. Winding rod; 17. Fixed pulley; 18. Wire rope; 19. Third gear; 20. L-shaped frame; 21. Third rack; 22. Output pipe; 23. First valve; 24. Gas pipe; 25. Second valve; 26. Gas inlet pipe; 27. One-way valve; 28. Open pipe; 29. ​​Protective gas tank; 30. Vacuum tube; 31. Moving seat; 32. Moving groove; 33. First motor; 34. Screw; 35. Threaded seat; 36. Side plate; 37. Second motor; 38. Round rod; 39. Stirring blade; 40. Furnace door. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1-9 The present invention provides a copper alloy nano insulating bonding wire and a technical solution for preparing the same: the copper alloy nano insulating bonding wire contains the following components in weight percentage: 100 parts of copper and 0.5-1.5 parts of palladium; 100 parts of copper and 1 part of palladium are respectively placed in a main crucible and a sub-crucible; in the first stage, the copper is melted in the main crucible, and the palladium is preheated in the sub-crucible during the copper melting process; in the second stage, the sub-crucible is moved to the upper end of the main crucible so that the two form a combined crucible, and the preheated palladium particles in the sub-crucible fall into the metal liquid in the main crucible, thereby first melting the low-melting-point metal and then gradually adding the high-melting-point metal.

[0035] The method is implemented by using a copper alloy bonding wire preparation device, which includes a heating furnace 1, a crucible mechanism, a gas injection mechanism, a moving mechanism and a stirring mechanism. The crucible mechanism is provided inside the heating furnace 1, the gas injection mechanism is provided on the side of the heating furnace 1, the moving mechanism is provided on the upper surface of the heating furnace 1, and the stirring mechanism is provided on the moving mechanism. The heating furnace 1 is used to heat the metal in the crucible mechanism, the moving mechanism is used to move the stirring mechanism, the stirring mechanism is used to stir the metal liquid in the crucible mechanism, and the gas injection mechanism is used to inject gas into the output pipe. The method is characterized in that the crucible mechanism includes a main crucible and a sub-crucible mechanism adapted thereto. When a part of the metal is melted in the main crucible, the sub-crucible assembly is moved toward the main crucible by a hydraulic rod. The two form a new crucible, and then the auxiliary crucible assembly is opened to allow the preheated metal inside to enter the originally molten metal liquid. The crucible mechanism includes a main crucible 2 located in the center of the bottom surface of the heating furnace 1. A hydraulic rod 10 is installed on the side of the heating furnace 1 above the main crucible 2. The end of the hydraulic rod 10 extends to the interior of the heating furnace 1 and is installed with an auxiliary crucible 3 whose lower end is in the same plane as the upper end of the main crucible 2. Two sealing plates 4 are correspondingly provided inside the auxiliary crucible 3. A first gear 5 is rotatably installed on the side of the auxiliary crucible 3. Two first racks 6 that are meshed with the first gear 5 are correspondingly installed on the side of the auxiliary crucible 3 for sliding up and down. An L-shaped plate 7 is installed on one end of each first rack 6 on one side of the auxiliary crucible 3. One side of each sealing plate 4 extends to the auxiliary crucible 3. The outside of the crucible 2 is fixedly connected to the adjacent L-shaped plate 7, a second gear 8 is installed on the side of the first gear 5, and a second rack 9 meshing with the second gear 8 is provided on one side of the second gear 8. The inner bottom surface of the main crucible 2 is installed with an output pipe 22 extending to the outside of the heating furnace 1, and a first valve 23 is installed on the output pipe 22 near the heating furnace 1. When the metal liquid in the main crucible 2 is stirred evenly, the first motor 33 drives the screw 34 to reverse. Through the above operation, the stirring blade 39 is raised and moved out of the main crucible 2, and then the hydraulic rod 10 is extended to drive the auxiliary crucible 3 to move toward the main crucible 2 until the auxiliary crucible 3 moves to the upper end of the main crucible 2 and is aligned with it. The first motor 33 runs again to drive the screw 34 to rotate. Through the above operation, the side plate 36 is lowered, and the lowered side plate 36 When the stirring blade 39 is driven to descend, the second rack 9 is also driven to descend, and the descending second rack 9 is engaged with the second gear 8 to rotate the second gear 8. The rotating second gear 8 drives the first gear 5 to rotate and drive the two first racks 6 to move toward each other, thereby driving the two L-shaped plates 7 to move away from each other, and driving the two sealing plates 4 to move away from each other, so that the auxiliary crucible 3 is opened, and the palladium particles in the auxiliary crucible 3 fall into the molten metal in the main crucible 2. When the second rack 9 that continues to descend is disengaged from the second gear 8, the lower port of the auxiliary crucible 3 is completely opened, and then the round rod 38 that continues to descend drives the stirring blade 39 to pass through the auxiliary crucible 3 and enter the main crucible 2. Since the auxiliary crucible 3 is placed on the upper port of the main crucible 2 to form a combined crucible, the height of the upper port of the entire crucible is slightly increased.When the palladium particles fall into the molten metal, the molten metal splashed by the auxiliary crucible 3 will not splash to the outside.

[0036] See also Figure 3 、 Figure 5-6 and Figure 8 The stirring mechanism includes a side plate 36 installed on the side of the threaded seat 35, and a second motor 37 is installed on the upper surface of the side plate 36 just above the heating furnace 1. The driving end of the second motor 37 is installed with a round rod 38 that penetrates the side plate 36 and extends into the heating furnace 1. A number of evenly distributed stirring blades 39 are installed on the side of the round rod 38 near the lower end. The upper end of the second rack 9 extends to the outside of the heating furnace 1 and is fixedly connected to the lower surface of the side plate 36. A protective gas tank 29 is installed on the side of the heating furnace 1 above the hydraulic rod 10, and a vacuum tube 30 is installed on one side of the protective gas tank 29 on the other side of the heating furnace 1. A furnace door 40 is provided on the front surface of the heating furnace 1. The second motor 37 runs through the round rod 38 to drive each stirring blade 39 to rotate to stir the metal liquid in the main crucible 2 to make it evenly mixed.

[0037] See also Figure 1 、 Figure 3 、 Figure 5-7 The moving mechanism includes a moving base 31 installed on the upper surface of the heating furnace 1. A moving groove 32 is opened on the side of the moving base 31. A first motor 33 is installed on the upper end of the moving base 31. The driving end of the first motor 33 extends into the moving groove 32 and is installed with a screw 34 that is rotatably connected to its inner wall at the other end. A threaded seat 35 that is adapted to the moving groove 32 is provided on the screw 34. The first motor 33 drives the screw 34 to rotate when it runs. The rotating screw 34 drives the threaded seat 35 to descend. The descending threaded seat 35 drives the round rod 38 to descend through the side plate 36 so that the stirring blade 39 enters the main crucible 2.

[0038] See also Figure 1-3 , Figure 5-6The gas injection mechanism includes a mounting plate 11 mounted on the side of the heating furnace 1 on the hydraulic rod 10, a gas tank 12 is mounted on the lower surface of the mounting plate 11, a piston 13 is slidably arranged in the gas tank 12, a spring 14 is arranged above the piston 13 inside the gas tank 12, an air pipe 24 is mounted on the inner bottom surface of the gas tank 12, one end of which is connected to the output pipe 22, a second valve 25 is mounted on the air pipe 24 near the output pipe 22, an air inlet pipe 26 is mounted on the inner bottom surface of the gas tank 12 on one side of the air pipe 24, a one-way valve 27 is arranged on the air inlet pipe 26, and the side of the gas tank 12 is close to the gas tank 12. An open tube 28 is installed near the upper end. Two rectangular blocks 15 are installed on the upper surface of the mounting plate 11 on one side of the gas tank 12. A winding rod 16 is rotatably installed between the two rectangular blocks 15. A fixed pulley 17 is installed on the upper surface of the mounting plate 11 just above the gas tank 12. A steel wire rope 18 is installed at the center of the upper surface of the piston 13, one end of which passes through the fixed pulley 17 and is fixedly connected to the winding rod 16. One end of the winding rod 16 passes through the rectangular block 15 and is installed with a third gear 19. A third rack 21 is provided on one side of the third gear 19 and is placed horizontally and meshed with it. An L-shaped frame 20 is installed at one end of the third rack 21. One end of the L-shaped frame 20 extends to the inside of the heating furnace 1 and is fixedly connected to the auxiliary crucible 3. When the hydraulic rod 10 extends to move the auxiliary crucible 3, the third rack 21 is also driven to move through the L-shaped frame 20. The moving third rack 21 drives the third gear 19 to rotate. The rotating third gear 19 drives the winding rod 16 to rotate and wind the wire rope 18 to pull the piston 13 up. The rising piston 13 compresses the spring 14 while allowing air to enter the area below the piston 13 in the gas tank 12 through the air inlet pipe 26, so that the hydraulic rod 10 is shortened and drives the auxiliary crucible 3 to move. The moving auxiliary crucible 3 drives the third rack 21 to move in the opposite direction through the L-shaped frame 20. The winding rod 16 is unfolded through the above operation through the rising operation, and the pull on the piston 13 is released. The spring 14 rebounds and drives the piston 13 to descend. The descending piston 13 presses the gas below it in the gas tank 12 into the gas pipe 24, and then the gas enters the output pipe 22. The gas squeezes part of the molten metal remaining in the output pipe 22 into the next process to ensure that there is no molten metal residue in the output pipe 22.

[0039] The specific steps include:

[0040] S1. Connect the vacuum tube 30 to the vacuum generator, connect the protective gas tank 29 to the output end of the inert gas delivery device, open the furnace door 40, put a certain amount of copper into the main crucible 2, put a certain amount of palladium into the auxiliary crucible 3, then close the furnace door 40, and operate the vacuum generator to vacuum the interior of the heating furnace 1. Then, the inert gas is delivered into the heating furnace 1 through the inert gas delivery device;

[0041] S2. The heating furnace 1 is operated to heat its internal temperature to 1,083 degrees Celsius. The copper in the main crucible 2 slowly melts into liquid. Then, the first motor 33 is operated to drive the screw 34 to rotate. The rotating screw 34 drives the threaded seat 35 to descend. The descending threaded seat 35 drives the round rod 38 to descend through the side plate 36, so that the stirring blades 39 enter the main crucible 2. Then, the second motor 37 is operated to drive each stirring blade 39 to rotate through the round rod 38 to stir the metal liquid in the main crucible 2, thereby accelerating the dissolution of the copper.

[0042] S3. At the same time, the high temperature in the heating furnace 1 will also preheat the palladium in the auxiliary crucible 3. When the copper in the main crucible 2 is completely melted into liquid, the first motor 33 drives the screw 34 to reverse. Through the above operation, the stirring blade 39 is lifted and moved out of the main crucible 2. Then, the hydraulic rod 10 is extended to drive the auxiliary crucible 3 to move toward the main crucible 2 until the auxiliary crucible 3 moves to the upper end of the main crucible 2 and is aligned with it. The first motor 33 is operated again to drive the screw 34 to rotate. Through the above operation, the side plate 36 is lowered. The lowered side plate 36 drives the stirring blade 39 to descend, and at the same time, the second rack 9 is driven to descend.

[0043] S4, the descending second rack 9 will mesh with the second gear 8 to rotate the second gear 8, and the rotating second gear 8 will drive the first gear 5 to rotate and drive the two first racks 6 to move toward each other, thereby driving the two L-shaped plates 7 to move away from each other, and driving the two sealing plates 4 to move away from each other, so that the auxiliary crucible 3 is opened, and the palladium particles in the auxiliary crucible 3 will fall into the molten metal in the main crucible 2. When the second rack 9 that continues to descend is disengaged from the second gear 8, the lower port of the auxiliary crucible 3 is completely opened, and then the round rod 38 that continues to descend drives the stirring blade 39 to pass through the auxiliary crucible 3 and enter the main crucible 2. Since the auxiliary crucible 3 is placed on the upper port of the main crucible 2 to form a combined crucible, the height of the upper port of the entire crucible is slightly increased, and the molten metal splashed by the palladium particles falling into the molten metal will not splash to the outside due to the obstruction of the auxiliary crucible 3;

[0044] S5. Raise the temperature in the heating furnace 1 to 1552°C to melt the palladium. Then, the second motor 37 is driven to rotate the stirring blade 39 to stir the molten metal in the combined crucible to mix it evenly. Even if the addition of liquid causes the molten metal to rise, the presence of the auxiliary crucible 3 slightly raises the height of the upper end of the crucible, thereby preventing the molten metal from splashing out during stirring.

[0045] S6. When the hydraulic rod 10 extends to move the auxiliary crucible 3, it also drives the third rack 21 to move through the L-shaped frame 20. The moving third rack 21 drives the third gear 19 to rotate. The rotating third gear 19 drives the winding rod 16 to rotate and wind the wire rope 18, pulling the piston 13 upward. The rising piston 13 compresses the spring 14 while allowing air to enter the area below the piston 13 in the gas tank 12 through the air inlet pipe 26.

[0046] S7. After the combined crucible and the molten metal are evenly mixed, the first valve 23 is opened to allow the copper alloy molten metal to flow through the output pipe 22 into the next process to be cast into an alloy ingot in the magnetic field. After the molten metal in the combined crucible has flowed out, the first valve 23 is closed, and the first motor 33 drives the screw 34 to reverse. Through the above operation, the side plate 36 is raised, driving the round rod 38 and the second rack 9 to rise. After the raised second rack 9 is engaged with the second gear 8, the above operation drives the second gear 8 to reverse, so that the two sealing plates 4 approach each other until they contact each other. The raised round rod 38 drives the stirring blade 39 to move out of the combined crucible.

[0047] S8. Open the second valve 25 to shorten the hydraulic rod 10 and move the auxiliary crucible 3. The moving auxiliary crucible 3 drives the third rack 21 to move in the opposite direction through the L-shaped frame 20. The winding rod 16 is unfolded by the upward operation, and the pulling on the piston 13 is released. The spring 14 rebounds and drives the piston 13 to descend. The descending piston 13 presses the gas below the gas tank 12 into the gas pipe 24. Then the gas enters the output pipe 22. The gas squeezes the part of the molten metal remaining in the output pipe 22 into the next process to ensure that there is no molten metal residue in the output pipe 22. The operation is completed.

Claims

1. A method for preparing a copper alloy nano-insulated bonding wire, characterized by: The copper alloy nano insulating bonding wire contains the following components in weight proportions: 100 parts of copper and 0.5-1.5 parts of palladium. 100 parts of copper and 0.5-1.5 parts of palladium are respectively located in a main crucible and a sub-crucible. In the first stage, the copper is melted in the main crucible. During the copper melting process, the palladium is preheated in the sub-crucible. In the second stage, the sub-crucible is moved to the upper end of the main crucible so that the two form a combined crucible, and the preheated palladium particles in the sub-crucible fall into the metal liquid in the main crucible, so as to realize the operation of first melting the low melting point metal and then gradually adding the high melting point metal. The method is realized by using a copper alloy bonding wire preparation device, and the copper alloy bonding wire preparation device includes a heating A furnace (1), a crucible mechanism, a gas injection mechanism, a moving mechanism and a stirring mechanism, wherein the crucible mechanism is provided inside the heating furnace (1), the gas injection mechanism is provided on the side of the heating furnace (1), the moving mechanism is provided on the upper surface of the heating furnace (1), and the stirring mechanism is provided on the moving mechanism, the heating furnace (1) is used to heat the metal in the crucible mechanism, the moving mechanism is used to move the stirring mechanism, the stirring mechanism is used to stir the metal liquid in the crucible mechanism, the gas injection mechanism is used to inject gas into the output pipe, the crucible mechanism includes a main crucible and a secondary crucible assembly adapted thereto, and when a portion of the metal is melted in the main crucible, the secondary crucible assembly The hydraulic rod is moved toward the main crucible so that the two form a new crucible, and then the auxiliary crucible assembly is opened so that the preheated metal inside enters the original molten metal liquid; the crucible mechanism includes a main crucible (2) located at the center of the bottom surface of the heating furnace (1), and a hydraulic rod (10) is installed on the side of the heating furnace (1) above the main crucible (2), and the end of the hydraulic rod (10) extends into the interior of the heating furnace (1) and is installed with an auxiliary crucible (3) whose lower end is in the same plane as the upper end of the main crucible (2), and two sealing plates (4) are correspondingly provided inside the auxiliary crucible (3), and a first gear (5) is rotatably installed on the side of the auxiliary crucible (3). Two first racks (6) meshing with the first gear (5) are slidably mounted on the upper and lower surfaces, one end of each first rack (6) is mounted with an L-shaped plate (7) on one side of the auxiliary crucible (3), one side of each sealing plate (4) extends to the outside of the auxiliary crucible (3) and is fixedly connected to the adjacent L-shaped plate (7), a second gear (8) is mounted on the side of the first gear (5), and a second rack (9) meshing with the second gear (8) is provided on one side of the second gear (8), an output pipe (22) extending to the outside of the heating furnace (1) is mounted on the inner bottom surface of the main crucible (2), and a first valve (23) is mounted on the output pipe (22) near the heating furnace (1).

2. The method for preparing the copper alloy nano insulating bonding wire according to claim 1, wherein: The gas injection mechanism includes a mounting plate (11) mounted on the side of the heating furnace (1) on the hydraulic rod (10), a gas tank (12) is mounted on the lower surface of the mounting plate (11), a piston (13) is slidably arranged in the gas tank (12), a spring (14) is arranged above the piston (13) inside the gas tank (12), an air pipe (24) whose one end is connected to the output pipe (22) is mounted on the inner bottom surface of the gas tank (12), a second valve (25) is mounted on the air pipe (24) near the output pipe (22), an air inlet pipe (26) is mounted on the inner bottom surface of the gas tank (12) on one side of the air pipe (24), a one-way valve (27) is arranged on the air inlet pipe (26), and an open pipe (28) is mounted on the side of the gas tank (12) near the upper end.

3. The method for preparing the copper alloy nano insulating bonding wire according to claim 2, characterized in that: Two rectangular blocks (15) are mounted on the upper surface of the mounting plate (11) on one side of the gas tank (12), and a winding rod (16) is rotatably mounted between the two rectangular blocks (15). A fixed pulley (17) is mounted on the upper surface of the mounting plate (11) just above the gas tank (12). A steel wire rope (18) is mounted at the center of the upper surface of the piston (13), one end of which passes through the fixed pulley (17) and is fixedly connected to the winding rod (16). One end of the winding rod (16) passes through the rectangular block (15) and is mounted with a third gear (19). A third rack (21) is arranged on one side of the third gear (19) and is meshed with the third rack. An L-shaped frame (20) is mounted on one end of the third rack (21), and one end of the L-shaped frame (20) extends to the interior of the heating furnace (1) and is fixedly connected to the auxiliary crucible (3).

4. The method for preparing the copper alloy nano insulating bonding wire according to claim 3, characterized in that: The moving mechanism includes a moving seat (31) installed on the upper surface of the heating furnace (1), a moving groove (32) is provided on the side of the moving seat (31), a first motor (33) is installed on the upper end of the moving seat (31), a driving end of the first motor (33) extends into the moving groove (32) and is installed with a screw (34) whose other end is rotatably connected to the inner wall thereof, and a threaded seat (35) is provided on the screw (34) that is adapted to the moving groove (32).

5. The method for preparing the copper alloy nano insulating bonding wire according to claim 4, characterized in that: The stirring mechanism includes a side plate (36) mounted on the side of the threaded seat (35), a second motor (37) is mounted on the upper surface of the side plate (36) just above the heating furnace (1), a round rod (38) is mounted on the driving end of the second motor (37) and extends through the side plate (36) into the heating furnace (1), a plurality of evenly distributed stirring blades (39) are mounted on the side of the round rod (38) near the lower end, the upper end of the second rack (9) extends to the outside of the heating furnace (1) and is fixedly connected to the lower surface of the side plate (36), a protective gas tank (29) is mounted on the side of the heating furnace (1) above the hydraulic rod (10), a vacuum tube (30) is mounted on the other side of the heating furnace (1) on one side of the protective gas tank (29), and a furnace door (40) is provided on the front surface of the heating furnace (1).

6. The method for preparing the copper alloy nano insulating bonding wire according to claim 5, characterized in that: The specific steps include: S1. Connect the vacuum tube (30) to the vacuum generator, connect the protective gas tank (29) to the output end of the inert gas delivery device, open the furnace door (40), put a certain amount of copper into the main crucible (2), put a certain amount of palladium into the auxiliary crucible (3), then close the furnace door (40), and operate the vacuum generator to make the inside of the heating furnace (1) into a vacuum, and then deliver the inert gas into the heating furnace (1) through the inert gas delivery device; S2, the heating furnace (1) is operated to heat the temperature inside it to 1,083 degrees, and the copper in the main crucible (2) slowly melts into liquid. Then, the first motor (33) is operated to drive the screw (34) to rotate. The rotating screw (34) drives the threaded seat (35) to descend. The descending threaded seat (35) drives the round rod (38) to descend through the side plate (36) so that the stirring blade (39) enters the main crucible (2). Then, the second motor (37) is operated to drive each stirring blade (39) to rotate through the round rod (38) to stir the metal liquid in the main crucible (2) to accelerate the dissolution of the copper. S3. At the same time, the high temperature in the heating furnace (1) will also preheat the palladium in the auxiliary crucible (3). When the copper in the main crucible (2) is completely melted into liquid, the first motor (33) drives the screw (34) to reverse and the stirring blade (39) is moved up and out of the main crucible (2) through the above operation. Then, the hydraulic rod (10) extends and drives the auxiliary crucible (3) to move toward the main crucible (2) until the auxiliary crucible (3) moves to the upper end of the main crucible (2) and is aligned with it. The first motor (33) runs again to drive the screw (34) to rotate and the side plate (36) is lowered through the above operation. The lowered side plate (36) drives the stirring blade (39) to descend and also drives the second rack (9) to descend. S4, the descending second rack (9) will mesh with the second gear (8) to rotate the second gear (8), and the rotating second gear (8) will drive the first gear (5) to rotate and drive the two first racks (6) to move toward each other, thereby driving the two L-shaped plates (7) away from each other, driving the two sealing plates (4) away from each other, so that the auxiliary crucible (3) is opened, and the palladium particles in the auxiliary crucible (3) will fall into the molten metal in the main crucible (2). When the second rack (9) that continues to descend is separated from the second gear (8), the lower end of the auxiliary crucible (3) is completely opened, and then the round rod (38) that continues to descend drives the stirring blade (39) to pass through the auxiliary crucible (3) and enter the main crucible (2). Since the auxiliary crucible (3) is placed on the upper end of the main crucible (2) to form a combined crucible, the height of the upper end of the entire crucible is slightly increased, and the metal liquid splashed by the palladium particles falling into the metal liquid will not splash to the outside through the obstruction of the auxiliary crucible (3); S5. The temperature in the heating furnace (1) is raised to 1,552 degrees to melt the palladium. The second motor (37) then drives the stirring blade (39) to rotate and stir the molten metal in the combined crucible to mix it evenly. Even if the addition of liquid causes the original molten metal to rise, the presence of the auxiliary crucible (3) slightly increases the height of the upper end of the crucible, which prevents the molten metal from splashing to the outside during stirring. S6. When the hydraulic rod (10) is extended to move the auxiliary crucible (3), the third rack (21) is also driven to move through the L-shaped frame (20). The moving third rack (21) drives the third gear (19) to rotate. The rotating third gear (19) drives the winding rod (16) to rotate the winding wire rope (18) to pull the piston (13) upward. The rising piston (13) compresses the spring (14) and allows air to enter the area below the piston (13) in the gas tank (12) through the air inlet pipe (26); S7. When the combined crucible and the molten metal are evenly mixed, the first valve (23) is opened to allow the copper alloy molten metal to flow into the next process through the output pipe (22) and be cast into an alloy ingot in the magnetic field. When the molten metal in the combined crucible has flowed out, the first valve (23) is closed, and the first motor (33) drives the screw (34) to reverse. Through the above operation, the side plate (36) is raised and the round rod (38) and the second rack (9) are raised. After the raised second rack (9) is engaged with the second gear (8), the second gear (8) is driven to reverse through the above operation so that the two sealing plates (4) are close to each other until they contact each other. The raised round rod (38) drives the stirring blade (39) to move out of the combined crucible. S8, open the second valve (25), let the hydraulic rod (10) shorten and drive the auxiliary crucible (3) to move, the moving auxiliary crucible (3) drives the third rack (21) to move in the opposite direction through the L-shaped frame (20), and the winding rod (16) is unfolded by the above operation through the upward operation, and the pulling on the piston (13) is released. The spring (14) rebounds and drives the piston (13) to descend. The descending piston (13) presses the gas below the gas tank (12) into the gas pipe (24), and then the gas enters the output pipe (22). The gas squeezes part of the molten metal left in the output pipe (22) into the next process to ensure that there is no molten metal residue in the output pipe (22). The operation is completed.

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