Copper alloy nanometer insulation bonding wire and preparation method thereof

Abstract

The invention discloses a copper alloy nano insulation bonding wire and a preparation method thereof, and relates to the technical field of bonding wires, a crucible mechanism of the copper alloy nano insulation bonding wire is provided with a main crucible and an auxiliary crucible, the main crucible and the auxiliary crucible form a combined crucible, the height of the whole crucible is slightly increased, and splashing caused by palladium falling into molten metal cannot fly to the outside of the crucible; the auxiliary crucible can protect the molten metal to prevent the molten metal from splashing when the molten metal is stirred later, the influence on the quality of finished products due to the fact that the metal proportion is not appropriate due to splashing is also avoided, meanwhile, when the auxiliary crucible moves towards the main crucible, a piston in a gas tank is pulled to rise through an assembly, and gas enters a gas pipe while a spring is compressed, so that the quality of the finished products is improved. And then when the auxiliary crucible moves reversely and restores, the spring rebounds to inject gas in the gas tank into the output pipe through the gas pipe, part of molten metal left in the output pipe is squeezed into the next process, it is guaranteed that no molten metal is left in the output pipe, and it is avoided that the molten metal is left in the output pipe and solidified, and consequently the output pipe is blocked.

Description

Technical Field

[0001] The 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 balling 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 area in the organization. The bonding wire is oriented during the cold drawing process, and the crystallinity gradually increases. The difference in the elongation ability of the crystalline area and the amorphous area will cause tiny cracks to appear at the interface between the crystalline area and the amorphous area. As the bonding wire is pulled thinner and reaches the nanometer level, these microcracks will be enlarged. 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. However, in the actual preparation process of nano copper alloy bonding wire, palladium needs to be added to copper to melt it into 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 copper alloy. However, the melting point of copper is 1083 degrees, and the melting point of palladium is 1552 degrees, with a difference of nearly 500 degrees. 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, copper is usually melted first, and then palladium is added 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 melting efficiency, The selected crucibles are all selected based on the volume of metal to be melted, so that the liquid metal level is close to the upper end of the crucible, which can ensure stability and efficiency during the melting process. However, if the liquid level is too close to the upper end of the crucible, when palladium is added, since the palladium is still in solid form, palladium put into the crucible 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 may 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 and reducing the quality of the finished product. However, if a larger crucible is used to make the metal 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

[0003] In view of the deficiencies in the prior art, the present invention provides a copper alloy nano insulating bonding wire and a preparation method thereof, which solves the above-mentioned problems.

[0004] To achieve the above purpose, the present invention is implemented through the following technical scheme: copper alloy nano insulating bonding wire, the bonding copper alloy wire contains the following weight ratio of ingredients in weight percentage: 100 parts of copper, 0.5-1.5 parts of palladium, 100 parts of copper, 1 part of palladium are respectively located in a main crucible and a sub-crucible, in the first stage when the copper is melted, it 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, so as to realize the operation of first melting the low melting point metal and then gradually adding the high melting point metal.

[0005] As a further technical solution of the present invention, the method is implemented using a copper alloy bonding wire preparation device, and the copper alloy bonding preparation device includes a heating furnace, a crucible mechanism, a gas injection mechanism, a moving mechanism and a stirring mechanism. The interior of the heating furnace is provided with a crucible mechanism, the side of the heating furnace is provided with a gas injection mechanism, the upper surface of the heating furnace is provided with a moving mechanism, and the moving mechanism is provided with a stirring 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 secondary crucible mechanism matched therewith. When a part of the metal is melted in the main crucible, the secondary crucible assembly moves toward the main crucible through a hydraulic rod so that the two form a new crucible, and then the secondary crucible assembly is opened to allow the preheated metal inside it to enter the originally molten metal liquid.

[0006] 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, two sealing plates are correspondingly arranged inside the sub-crucible, a first gear is rotatably installed on the side of the sub-crucible, and two first racks that are meshed with the first gear are correspondingly slidably installed on the side of the sub-crucible up and down, each of the first racks is installed with an L-shaped plate at one end of one side of the sub-crucible, one side of each sealing plate 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 meshed with it is arranged on one side of the second gear, 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.

[0007] 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 slidably 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 arranged on the air inlet pipe, and an open pipe is installed on the side of the gas tank near the upper end.

[0008] 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, 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, 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, one side of the third gear is provided with a third rack placed horizontally and meshing with the third rack, one end of the third rack is installed with an L-shaped frame, one end of the L-shaped frame extends to the inside of the heating furnace and is fixedly connected to the auxiliary crucible.

[0009] 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 rod whose other end is rotatably connected to its inner wall, and a threaded seat is provided on the screw rod that is compatible with the moving groove.

[0010] 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 just above the heating furnace, a round rod is installed on the driving end of the second motor and passes through the side plate and extends into the heating furnace, a number 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 the other side of the heating furnace on one side of the protective gas tank, and a furnace door is provided on the front surface of the heating furnace.

[0011] The specific steps include: 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, and operate the vacuum generator to make the inside of the heating furnace vacuum, and then deliver the inert gas into the heating furnace through the inert gas delivery device; S2, the heating furnace is operated to heat the temperature inside to 1,083 degrees, and the copper in the main crucible is slowly melted into liquid. Then the first motor is operated to drive the screw to rotate, and the rotating screw drives the threaded seat to descend. The descending threaded seat drives the round rod to descend through the side plate so that the stirring blade enters the main crucible. Then the second motor is operated to drive each stirring blade to rotate through the round rod to stir the metal liquid in the main crucible, thereby accelerating the dissolution of copper. 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 and the stirring blade is moved up and out of the main crucible through the above operation. 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 operated again to drive the screw to rotate and the side plate is lowered through the above operation. The lowered side plate drives the stirring blade to descend and also drives the second rack to descend; S4, the descending second rack will mesh with the second gear to rotate the second gear, the rotating second gear will drive the first gear to rotate and drive the two first racks to move towards each other, and then drive the two L-shaped plates to move away from each other, drive 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 will fall into the molten metal in the main crucible, when the second rack that continues to descend is separated 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 into 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 palladium particles falling into the molten metal splashed by the molten metal will not splash to the outside through the obstruction of the auxiliary crucible; S5. Raise the temperature in the heating furnace to 1552 degrees to melt the palladium. Then, the second motor drives the stirring blade to rotate and stir the molten metal in the combined crucible to make it evenly mixed. Even if the addition of liquid causes the original molten metal to rise, the existence of the auxiliary crucible slightly increases the height of the upper port of the entire crucible, which can prevent the molten metal from splashing to the outside during stirring. S6. When the hydraulic rod is extended to move the auxiliary crucible, the third rack is also driven 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 up. 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. S7. When the combined crucible and the molten metal are evenly mixed, the first valve is opened to allow the copper alloy molten metal to flow into the next process through the output pipe 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 is closed, and the first motor drives the screw to reverse through the above operation to make the side plate rise and drive the round rod and the second rack to rise. After the raised second rack is engaged with the second gear, the second gear is driven to reverse through the above operation to make the two sealing plates approach each other until they contact each other, and the raised round rod drives the stirring blade to move out of the combined crucible; S8. Open the second valve to shorten the hydraulic rod to 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 wrapped thereon is unfolded through the rising operation, and the pulling 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, and then the gas enters the output pipe. 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

[0012] The present invention provides a copper alloy nano insulating bonding wire and a preparation method thereof. Compared with the prior art, the present invention has the following beneficial effects: 1. Copper alloy nano insulating bonding wire and preparation method thereof. The crucible mechanism of the device is provided with a main crucible and a sub-crucible. When melting copper in the first stage, the copper is melted in the main crucible. At this time, the crucible solvent is adapted to the copper liquid so that the copper liquid surface 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, and 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 splash caused by the palladium falling into the metal liquid will not fly to the outside of the crucible, and the sub-crucible will also protect the metal liquid from splashing when the metal liquid is stirred later, thereby avoiding the waste of metal liquid. Avoid splashing to cause incorrect metal proportions that affect the quality of the finished product. 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 assembly, 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 to ensure that there is no molten metal remaining in the output pipe and to avoid molten metal remaining in the output pipe and solidification, which may cause blockage of the output pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a copper alloy nano insulating bonding wire and a preparation method thereof; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 It is a cross-sectional view of a copper alloy nano insulating bonding wire and a preparation method thereof; Figure 4 for Figure 3 Enlarged view of part B; Figure 5 It is a cross-sectional view of the working state of the copper alloy nano insulating bonding wire and the preparation method thereof; Figure 6 It is a schematic diagram of the internal structure of a copper alloy nano insulating bonding wire and a preparation method thereof; Figure 7 A cross-sectional view of a moving mechanism of a copper alloy nano insulating bonding wire and a preparation method thereof; Figure 8 It is a schematic diagram of the stirring mechanism structure of the copper alloy nano insulating bonding wire and the preparation method thereof; Fig. 9 It is a schematic diagram of the partial structure of the crucible mechanism of the copper alloy nano insulating bonding wire and its preparation method.

[0014] 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, air pipe; 25, second valve; 26, air 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

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0016] 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 located 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, so as to realize the operation of first melting the low melting point metal and then gradually adding the high melting point metal.

[0017] 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 heating furnace 1 is provided with a crucible mechanism inside, a gas injection mechanism is provided on the side of the heating furnace 1, a moving mechanism is provided on the upper surface of the heating furnace 1, and a 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 brand 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 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. 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 arranged 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 that are meshed with the first gear 5 are correspondingly installed on the side of the auxiliary crucible 3 in a sliding manner up and down, and one end of each first rack 6 is installed on one side of the auxiliary crucible 3. An L-shaped plate 7 is installed on one end of each first rack 6 on one side of the auxiliary crucible 3, and one side of each sealing plate 4 extends to the auxiliary crucible 3. The first gear 5 is provided with a second gear 8 on the side thereof, and a second rack 9 meshing with the first gear 8 is provided on one side thereof. The inner bottom surface of the main crucible 2 is provided with an output pipe 22 extending to the outside of the heating furnace 1, and a first valve 23 is provided 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, and the stirring blade 39 is moved up and out of the main crucible 2 through the above operation. 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 the auxiliary crucible 3. The first motor 33 is operated again to drive the screw 34 to rotate, and the side plate 36 is lowered through the above operation. 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 meshed with the second gear 8 to rotate the second gear 8, and 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, 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 separated 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 palladium particles fall into the molten metal, the molten metal splashed by the auxiliary crucible 3 will not splash to the outside.

[0018] 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, a second motor 37 is installed on the upper surface of the side plate 36 just above the heating furnace 1, a round rod 38 is installed on the driving end of the second motor 37, which penetrates the side plate 36 and extends into the heating furnace 1, and a plurality of evenly distributed stirring blades 39 are installed near the lower end of the side of the round rod 38. 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 drives each stirring blade 39 to rotate through the round rod 38 to stir the metal liquid in the main crucible 2 to make it evenly mixed.

[0019] See also Figure 1 , Figure 3 , Figure 5-7 The moving mechanism includes a moving seat 31 installed on the upper surface of the heating furnace 1, a moving groove 32 is opened 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, a threaded seat 35 adapted to the moving groove 32 is provided on the screw 34, the first motor 33 drives the screw 34 to rotate when running, the rotating screw 34 drives the threaded seat 35 to descend, and 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.

[0020] 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 with one end 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 a side of the gas tank 12 is close to the side of 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 corresponding to 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 with one end passing around the fixed pulley 17 and fixedly connected to the winding rod 16 is installed at the center of the upper surface of the piston 13, one end of the winding rod 16 passes through the rectangular block 15 and is installed with a third gear 19, and a third rack 21 placed horizontally and meshing with the third gear 19 is provided on one side of the third gear 19. 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 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 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 wound thereon is unfolded through the rising 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 remaining in the output pipe 22 into the next process to ensure that there is no molten metal residue in the output pipe 22.

[0021] The specific steps include: S1, connect the vacuum tube 30 with the vacuum generator, connect the protective gas tank 29 with 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 the operating vacuum generator will make the inside of the heating furnace 1 into a vacuum, and then the inert gas is delivered to the heating furnace 1 through the inert gas delivery device; S2, the heating furnace 1 is operated to heat the temperature inside to 1,083 degrees, and the copper in the main crucible 2 is slowly melted into liquid. Then the first motor 33 is operated to drive the screw 34 to rotate, and 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 to accelerate the dissolution of 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. Through the above operation, the stirring blade 39 is moved up and 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 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 towards 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 separated 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 palladium particles falling into the molten metal splashing The molten metal will not splash to the outside through the obstruction of the auxiliary crucible 3; S5, raising the temperature in the heating furnace 1 to 1552 degrees to melt the palladium, and then the second motor 37 drives the stirring blade 39 to rotate to stir the molten metal in the combined crucible to make it evenly mixed. Even if the addition of liquid causes the original molten metal to rise, the existence of the auxiliary crucible 3 slightly increases the height of the upper port of the entire crucible, which can prevent 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 and wind the wire rope 18 to pull 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. 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 driven to rise. After the raised second rack 9 is meshed 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 are in contact with each other, and the raised round rod 38 drives the stirring blade 39 to move out of the combined crucible; S8, open the second valve 25, shorten the hydraulic rod 10 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 wound thereon is unfolded through the rising operation, and the pulling on the piston 13 is released. The spring 14 rebounds and drives the piston 13 to descend, and 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, and 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, and the operation is completed.

Claims

1. Copper alloy nano-insulated bonding wire, characterized by: The bonding copper alloy 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 located in a main crucible and a sub-crucible. In the first stage, copper is melted in the main crucible, and 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, so as to realize the operation of first melting the low melting point metal and then gradually adding the high melting point metal.

2. The method for preparing the copper alloy nano insulating bonding wire according to claim 1, characterized in that: The method is implemented by using a copper alloy bonding wire preparation device, the copper alloy bonding preparation device comprising a heating furnace (1), a crucible mechanism, a gas injection mechanism, a moving mechanism and a stirring mechanism, the heating furnace (1) is provided with a crucible mechanism inside, the side of the heating furnace (1) is provided with a gas injection mechanism, the upper surface of the heating furnace (1) is provided with a moving mechanism, and the moving mechanism is provided with a stirring 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, characterized in that the crucible mechanism comprises a main crucible and a secondary crucible mechanism matched therewith, when a part of the metal is melted in the main crucible, the secondary crucible assembly is moved toward the main crucible by a hydraulic rod so that the two form a new crucible, and then the secondary crucible assembly is opened so that the preheated metal in it enters the originally molten metal liquid.

3. The copper alloy nano insulating bonding wire and the preparation method thereof according to claim 1, characterized in that: The crucible mechanism comprises a main crucible (2) located at 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 into the interior of the heating furnace (1) and is installed with a sub-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 arranged inside the sub-crucible (3); a first gear (5) is rotatably installed on the side of the sub-crucible (3); and two first gears (5) are correspondingly slidably installed on the upper and lower sides of the sub-crucible (3), both of which are meshed with the first gear (5). A rack (6) is provided on one end of each of the first racks (6) and an L-shaped plate (7) is installed on one side of the auxiliary crucible (3); one side of each of the sealing plates (4) extends to the outside of the auxiliary crucible (3) and is fixedly connected to a neighboring L-shaped plate (7); a second gear (8) is installed on the side of the first gear (5); 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 installed on the inner bottom surface of the main crucible (2); a first valve (23) is installed on the output pipe (22) near the heating furnace (1).

4. The copper alloy nano insulating bonding wire and the preparation method thereof according to claim 2, characterized in that: The gas injection mechanism comprises a mounting plate (11) mounted on the side of the heating furnace (1) and 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) in the gas tank (12); a gas pipe (24) having one end connected to an output pipe (22) is mounted on the inner bottom surface of the gas tank (12); a second valve (25) is mounted on the gas 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 mounted on the air inlet pipe (26); and an opening pipe (28) is mounted on the side of the gas tank (12) near the upper end.

5. The copper alloy nano insulating bonding wire and the preparation method thereof according to claim 3, characterized in that: Two rectangular blocks (15) are mounted on the upper surface of the mounting plate (11) at 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 around 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 disposed transversely and meshed with the third gear (19) at one side of the third rack (21). An L-shaped frame (20) is mounted at 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).

6. The copper alloy nano insulating bonding wire and the preparation method thereof according to claim 1, characterized in that: The moving mechanism comprises a moving seat (31) mounted on the upper surface of the heating furnace (1), a moving groove (32) being provided on the side of the moving seat (31), a first motor (33) being mounted on the upper end of the moving seat (31), a driving end of the first motor (33) extending into the moving groove (32) and being mounted with a screw (34) whose other end is rotatably connected to the inner wall thereof, and a threaded seat (35) matching the moving groove (32) being provided on the screw (34).

7. The copper alloy nano insulating bonding wire and the preparation method thereof according to claim 5, characterized in that: The stirring mechanism comprises 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 passes through the side plate (36) and extends 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 arranged on the front surface of the heating furnace (1).

8. The copper alloy nano insulating bonding wire and the preparation method thereof according to claim 6, characterized in that: The specific steps include: S1, connecting the vacuum tube (30) to the vacuum generator, connecting the protective gas tank (29) to the output end of the inert gas delivery device, opening the furnace door (40), placing a certain amount of copper into the main crucible (2), placing a certain amount of palladium into the auxiliary crucible (3), and then closing the furnace door (40). The operating vacuum generator turns the interior of the heating furnace (1) into a vacuum, and then the inert gas is delivered to the heating furnace (1) through the inert gas delivery device; S2, the heating furnace (1) is operated to heat the temperature inside it to one thousand and eighty-three degrees, and the copper in the main crucible (2) is slowly melted 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), thereby accelerating 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, 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 and, through the above operation, the side plate (36) is lowered. 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 towards each other, thereby driving the two L-shaped plates (7) to move away from each other, 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 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 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); S5, raising the temperature in the heating furnace (1) to 1552 degrees to melt the palladium, and then the second motor (37) is driven to rotate the stirring blade (39) to stir the molten metal in the combined crucible to make it uniformly mixed. Even if the addition of liquid causes the original molten metal to rise, the existence of the auxiliary crucible (3) slightly increases the height of the upper end of the entire crucible, thereby preventing 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 driven to rise. After the raised second rack (9) is meshed 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, opening the second valve (25), allowing the hydraulic rod (10) to 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) wound thereon is unfolded through the upward operation, releasing the pulling on the piston (13), and the spring (14) rebounds and drives the piston (13) to descend, and 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), and the gas squeezes part of the molten metal remaining in the output pipe (22) into the next process, ensuring that there is no molten metal remaining in the output pipe (22), and the operation is completed.

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