Preparation process of carbon nano tube modified aluminum alloy high-strength fitting

Abstract

The invention discloses a preparation process of a carbon nano tube modified aluminum alloy high-strength fitting, which comprises the following steps: S1, a raw material treatment stage: after coarsely filtering and purifying carbon nano tubes and aluminum alloy powder, putting the carbon nano tubes and the aluminum alloy powder into a wet mixing and ball milling device for mixing and dispersing to form composite powder; s2, a drying and filtering stage; s3, a melting and refining stage; s4, a curing and hot pressing stage; and S5, a bending assembly stage. According to the preparation process of the carbon nanotube modified aluminum alloy high-strength fitting, the performance of the aluminum alloy can be effectively improved by adding the carbon nanotube powder, so that the prepared fitting has the advantages of high specific strength, high specific modulus, wear resistance and corrosion resistance; in the preparation process, the damage of mechanical ball milling to the carbon nano tube powder is avoided through a wet ball milling mode, in addition, in the preparation process, the carbon nano tubes are dispersed in a liquid phase dispersion mode, the dispersed carbon nano tube powder is prevented from being agglomerated again in the sintering process, and the quality of the hardware fitting is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of hardware preparation technology, in particular to a preparation process of a carbon nanotube modified aluminum alloy high-strength hardware. Background Art

[0002] Hardware, iron or aluminum metal accessories widely used in power transmission lines, most of the hardware needs to withstand large tensile forces during operation, and some also need to ensure good electrical contact at the same time. According to the function and structure, it can be divided into suspension wire clamps, tension wire clamps, connection hardware, connection hardware, protection hardware, equipment wire clamps, T-type wire clamps, busbar hardware, wire pulling hardware and other categories. Power hardware is a metal accessory that connects and combines various devices in the power system and plays a role in transmitting mechanical loads, electrical loads and certain protective functions. Most of the hardware needs to withstand large tensile forces during operation, and some also need to ensure good electrical contact at the same time. It is related to the safety of the conductor or tower. Even if one is damaged, it may cause line failure. Therefore, the quality, correct use and installation of circuit hardware have an important impact on the safe power transmission of the line. After searching, it is found that the hardware processing in the prior art is typical, such as the power hardware processing process of publication number CN117141037A, including: matching the thickness according to the required thickness to determine the thickness distribution state of the target hardware, and the number of plate layers corresponding to each thickness distribution state is different; when the cooling difference is within the preset threshold range When the thickness of the target hardware is around, adjust the outer layer thickness; detect the thickness average of the vertical area of ​​the target hardware to determine the detection method; in the first detection method, detect the distribution state of the thickness abnormal points of the target hardware, and adjust the mold pressing speed corresponding to the thickness abnormal area when the thickness abnormal points are in a preset distribution state; in the second detection method, detect according to the thickness reference value of the bottom area of ​​the target hardware, and when the thickness reference value of the bottom area of ​​the target hardware is less than the preset thickness reference value range, adjust the position height of the inclined wedge. Its main feature is to improve the preparation efficiency of the production and processing process of multi-layer right-angle hanging plate power hardware and the preparation quality of the molded parts.

[0003] In summary, the existing hardware manufacturing processes are mostly for aluminum alloy materials, and the strength of aluminum alloy hardware is low. In view of the above problems, the existing manufacturing processes need to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of carbon nanotube modified aluminum alloy high-strength hardware to solve the problem that the existing hardware preparation processes mentioned in the above background technology are mostly for aluminum alloy materials, and the strength of aluminum alloy hardware is low.

[0005] To achieve the above object, the present invention provides the following technical solution: a process for preparing high-strength aluminum alloy fittings modified by carbon nanotubes, comprising the following steps:

[0006] S1, raw material processing stage, after filtering and removing impurities, carbon nanotubes and aluminum alloy powder are placed in a wet mixing ball mill to mix and disperse to form a composite powder, the ball milling time is 6-8h, and the dispersion method is liquid phase dispersion;

[0007] S2, drying and filtering stage, drying the mixed composite powder, dispersing the agglomerated composite powder, and sieving it again after drying and dispersion, drying by hot air drying, and the drying time is 3-5h;

[0008] S3, melting and refining stage, the screened materials are put into a vacuum melting furnace for processing, and the melting temperature is increased in stages;

[0009] S4, curing and hot pressing stage: the melted material is placed in a mold for curing and hot pressing, and ultrasonic vibration is applied to the solution during the curing process;

[0010] S5, bending and assembly stage: bend the solidified workpiece, remove surface burrs, and assemble other parts.

[0011] Preferably, the wet mixing ball mill device in the S1 raw material processing stage mixes the powders and then pours them into a deionized water solution containing a cationic surfactant for stirring, and obtains a second composite powder after filtering and drying. The second composite powder is then poured into deionized water for electrostatic adsorption, and obtained by filtering and drying.

[0012] Preferably, the heated material in the S3 melting and refining stage includes a third composite powder and a dispersant, and the ratio of the third composite powder to the dispersant is 99:1.

[0013] Preferably, the S3 melting and refining stage includes two operations: refining and heat preservation and standing, and the refining temperature is 700-720°C, and the heat preservation and standing temperature is 650-690°C.

[0014] Preferably, the pressure of hot pressing curing in the S4 curing hot pressing stage is 15-25 MPa and the temperature is 300-500°C.

[0015] Preferably, the deformation amount of the hot rolling process in the S4 curing hot pressing stage is 50%-60%, and the ultrasonic vibration adopts an ultrasonic oscillator.

[0016] Preferably, the S5 bending assembly stage also includes solution heat treatment and two-stage aging treatment operations, and the temperature of the solution treatment is usually between 700°C and 760°C, the holding time is 1-2 hours, and the cooling method is rapid cooling including quenching in water and quenching in oil.

[0017] Preferably, the first stage aging temperature of the double-stage aging treatment is 700°C-750°C, and the duration is 4-8 hours; the second stage aging temperature is 600°C-650°C, and the duration is 8-12 hours. The cooling methods of the double-stage aging treatment operation include air cooling and slow cooling.

[0018] Preferably, the wet mixing ball mill device used in the S1 raw material processing stage includes a base and a wet mixing ball mill mechanism, a frame is arranged on the top of the base, and the wet mixing ball mill mechanism is installed on the frame, the wet mixing ball mill mechanism includes a motor, a gear transmission structure, a drum, a discharge port, a sealing cover, a connector, a block, a shunt pipe, a nozzle and a connecting pipe, and the output end of the motor is connected to the rotating shaft on one side of the drum through the gear transmission structure, a discharge port is opened at the bottom of the drum, and the discharge port is connected to the sealing cover through a connector, blocks are distributed in an annular array on the inner wall of the drum, and a shunt pipe is arranged inside the drum, nozzles are evenly distributed on the bottom of the shunt pipe, and one end of the shunt pipe is connected to one end of the connecting pipe, the connecting pipe runs through the inside of the rotating shaft arranged on one side, and the other end of the connecting pipe is connected to an external pumping device.

[0019] Preferably, a material storage box is arranged below the discharge port, and the material storage box is slidably connected to the inside of the guide groove, and the guide groove is symmetrically opened on the top of the base, and a filter net bag is arranged between the material storage box and the discharge port, and the filter net bag is fixedly connected to the side wall of the frame.

[0020] Compared with the prior art, the invention has the following beneficial effects: the preparation process of the carbon nanotube modified aluminum alloy high-strength hardware is

[0021] The present invention can effectively solve the problem that most of the existing hardware preparation processes are for aluminum alloy materials, but the strength of aluminum alloy hardware is low through the combined use of aluminum alloy powder and carbon nanotube powder. By adding carbon nanotube powder, multiple properties of aluminum alloy can be effectively improved, so that the prepared hardware has the advantages of high specific strength and high specific modulus, wear resistance and corrosion resistance. In the preparation process, wet ball milling is used to avoid the damage to carbon nanotube powder caused by mechanical ball milling. In addition, liquid phase dispersion is used in the preparation process to mix and disperse carbon nanotubes, so as to avoid the re-agglomeration of dispersed carbon nanotube powder during the sintering process, thereby ensuring the quality of the hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a process flow chart for preparing the same;

[0023] Figure 2 It is a schematic diagram of the overall structure of the wet mixing ball mill mechanism of the present invention;

[0024] Figure 3 For the present invention Figure 2The enlarged structural diagram at A in the middle;

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the drum of the present invention.

[0026] In the figure: 1. base; 2. frame; 3. wet mixing ball mill mechanism; 301. motor; 302. gear transmission structure; 303. roller; 304. discharge port; 305. sealing cover; 306. connecting piece; 307. block; 308. diverter pipe; 309. nozzle; 3010. connecting pipe; 4. storage box; 5. guide groove; 6. filter net bag. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figure 1-4 , the present invention provides a technical solution:

[0029] Embodiment 1

[0030] A preparation process of a carbon nanotube modified aluminum alloy high-strength hardware comprises the following steps:

[0031] S1. In the raw material processing stage, the carbon nanotubes and aluminum alloy powders are filtered and impurities are removed, and then placed in a wet mixing ball mill for mixing and dispersion to form a composite powder. The ball milling time is 6-8 hours, and the dispersion method is liquid phase dispersion. The composition of the aluminum alloy powder includes the following components by weight: 20-60% strontium, 30-80 parts of iron, 1-10 parts of rhenium, 20-75 parts of copper, 10-50 parts of boron, and 1-10 parts of zirconium.

[0032] S2, drying and filtering stage, drying the mixed composite powder, dispersing the agglomerated composite powder, and sieving it again after drying and dispersion, drying by hot air drying, and the drying time is 3-5h;

[0033] S3, melting and refining stage, the screened materials are put into a vacuum melting furnace for processing, and the melting temperature is increased in stages;

[0034] S4, curing and hot pressing stage: the melted material is placed in a mold for curing and hot pressing, and ultrasonic vibration is applied to the solution during the curing process;

[0035] S5, bending and assembly stage: bend the solidified workpiece, remove surface burrs, and assemble other parts.

[0036] In a further embodiment, the wet mixing ball mill device in the S1 raw material processing stage mixes the powders and then pours them into a deionized water solution containing a cationic surfactant and stirs them. After filtering and drying, a second composite powder is obtained. The second composite powder is then poured into deionized water for electrostatic adsorption, and after filtering and drying, a third composite powder is obtained.

[0037] In a further embodiment, the heated material in the melting and refining stage S3 includes a third composite powder and a dispersant, and the ratio of the third composite powder to the dispersant is 99:1.

[0038] In a further embodiment, the S3 melting and refining stage includes two operations: refining and heat preservation and standing, and the refining temperature is 700-720°C, and the heat preservation and standing temperature is 650-690°C.

[0039] In a further embodiment, the pressure of hot pressing curing in the S4 curing hot pressing stage is 15-25 MPa and the temperature is 300-500°C.

[0040] In a further embodiment, the deformation amount of the hot rolling process in the S4 curing hot pressing stage is 50%-60%, and the ultrasonic vibration adopts an ultrasonic oscillator.

[0041] In a further embodiment, the S5 bending assembly stage also includes solution heat treatment and two-stage aging treatment operations, and the solution treatment temperature is generally between 700°C and 760°C, the holding time is 1-2 hours, and the cooling method is rapid cooling including water quenching and oil quenching.

[0042] In a further embodiment, the first stage aging temperature of the double-stage aging treatment is 700°C-750°C, and the duration is 4-8 hours; the second stage aging temperature is 600°C-650°C, and the duration is 8-12 hours. The cooling methods of the double-stage aging treatment operation include air cooling and slow cooling.

[0043] Embodiment 2

[0044] This embodiment is a further description of the above embodiment. It should be understood that this embodiment includes all the aforementioned technical features and is further described in detail.

[0045] In a further embodiment, the wet mixing ball milling device used in the S1 raw material processing stage includes a base 1 and a wet mixing ball milling mechanism 3, a frame 2 is arranged on the top of the base 1, and the wet mixing ball milling mechanism 3 is installed on the frame 2, and the wet mixing ball milling mechanism 3 includes a motor 301, a gear transmission structure 302, a roller 303, a discharge port 304, a sealing cover 305, a connecting piece 306, a stopper 307, a shunt pipe 308, a nozzle 309 and a connecting pipe 3010, and the output end of the motor 301 is connected to the rotating shaft on one side of the roller 303 through the gear transmission structure 302. The drum 303 is connected to the shaft, a discharge port 304 is provided at the bottom thereof, and the discharge port 304 is connected to the sealing cover 305 through a connector 306, blocks 307 are distributed in a circular array on the inner wall of the drum 303, and a shunt pipe 308 is provided inside the drum 303, nozzles 309 are distributed at equal intervals at the bottom of the shunt pipe 308, and one end of the shunt pipe 308 is connected to one end of a connecting pipe 3010, the connecting pipe 3010 runs through the inside of the rotating shaft arranged on one side, and the other end of the connecting pipe 3010 is connected to an external pumping device.

[0046] In a further embodiment, a storage box 4 is arranged below the discharge port 304, and the storage box 4 is slidably connected to the inside of the guide groove 5. At the same time, the guide groove 5 is symmetrically opened at the top of the base 1. A filter net bag 6 is arranged between the storage box 4 and the discharge port 304, and the filter net bag 6 is fixedly connected to the side wall of the frame 2.

[0047] Specifically, in the actual working process, the material to be processed and the steel balls are put into the inside of the drum 303 through the discharge port 304 located on the side, and then the sealing cover 305 is connected to the discharge port 304 by the connecting piece 306 to achieve the sealing of the discharge port 304, and the connecting pipe 3010 is connected to the external pumping equipment, and then the power starter is connected, and the motor 301 drives the drum 303 to rotate through the gear transmission structure 302. When the drum 303 rotates, the powder and the balls inside it fall continuously under the obstruction of the block 307, thereby achieving ball milling. At the same time, the external water enters the inside of the shunt pipe 308 through the connecting pipe 3010 driven by the external pumping equipment. , and spray the powder and steel balls through the multiple groups of nozzles 309 at the bottom, so as to reduce the damage caused by ball milling to the carbon nanotube powder. When the ball milling is completed, first remove the connecting piece 306 to remove the sealing cover 305 from the discharge port 304, and then control the motor 301 to drive the drum 303 to rotate so that the discharge port 304 is downward, and the material and steel balls inside the drum 303 are discharged through the discharge port 304 and fall onto the filter net bag 6, so as to achieve one-time rapid discharge. After being filtered by the filter net bag 6, the powder is stored in the storage box 4, and the steel balls are stacked in the filter net bag 6. The staff can use the traction equipment to drive the storage box 4 storing the powder to be moved and transported along the movable guide groove 5.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preparing high-strength aluminum alloy fittings modified by carbon nanotubes, characterized in that: The following steps are involved: S1, raw material processing stage, after filtering and removing impurities, carbon nanotubes and aluminum alloy powder are placed in a wet mixing ball mill to mix and disperse to form a composite powder, the ball milling time is 6-8h, and the dispersion method is liquid phase dispersion; S2, drying and filtering stage, drying the mixed composite powder, dispersing the agglomerated composite powder, and sieving it again after drying and dispersion, drying by hot air drying, and the drying time is 3-5h; S3, melting and refining stage, the screened materials are put into a vacuum melting furnace for processing, and the melting temperature is increased in stages; S4, curing and hot pressing stage: the melted material is placed in a mold for curing and hot pressing, and ultrasonic vibration is applied to the solution during the curing process; S5, bending and assembly stage: bend the solidified workpiece, remove surface burrs, and assemble other parts.

2. The process for preparing a high-strength aluminum alloy modified by carbon nanotubes according to claim 1, characterized in that: The wet mixing ball mill device in the S1 raw material processing stage mixes the powders and pours them into a deionized water solution containing a cationic surfactant and stirs them. After filtering and drying, a second composite powder is obtained. Then, the second composite powder is poured into deionized water for electrostatic adsorption, and after filtering and drying, a third composite powder is obtained.

3. The process for preparing a high-strength aluminum alloy modified by carbon nanotubes according to claim 1, characterized in that: The heated materials in the S3 melting and refining stage include a third composite powder and a dispersant, and the ratio of the third composite powder to the dispersant is 99:

1.

4. The process for preparing a high-strength aluminum alloy fitting modified by carbon nanotubes according to claim 1, characterized in that: The S3 melting and refining stage includes two operations: refining and heat preservation and standing. The refining temperature is 700-720°C, and the heat preservation and standing temperature is 650-690°C.

5. The process for preparing a high-strength aluminum alloy fitting modified by carbon nanotubes according to claim 1, characterized in that: The pressure of hot pressing curing in the S4 curing hot pressing stage is 15-25 MPa and the temperature is 300-500°C.

6. The process for preparing a high-strength metal fitting made of carbon nanotube-modified aluminum alloy according to claim 1, characterized in that: The deformation amount of the hot rolling process in the S4 curing hot pressing stage is 50%-60%, and the ultrasonic vibration adopts an ultrasonic oscillator.

7. The process for preparing a high-strength aluminum alloy modified by carbon nanotubes according to claim 1, characterized in that: The S5 bending assembly stage also includes solution heat treatment and two-stage aging treatment operations, and the solution treatment temperature is usually between 700°C and 760°C, the holding time is 1-2 hours, and the cooling method is rapid cooling including water quenching and oil quenching.

8. The process for preparing a high-strength aluminum alloy modified by carbon nanotubes according to claim 7, characterized in that: The first stage aging temperature of the double-stage aging treatment is 700°C-750°C, and the duration is 4-8 hours; the second stage aging temperature is 600°C-650°C, and the duration is 8-12 hours. The cooling methods of the double-stage aging treatment operation include air cooling and slow cooling.

9. The process for preparing a high-strength metal fitting made of carbon nanotube-modified aluminum alloy according to claim 1, characterized in that: The wet mixing ball milling device used in the S1 raw material processing stage comprises a base (1) and a wet mixing ball milling mechanism (3), wherein a frame (2) is arranged on the top of the base (1), and the wet mixing ball milling mechanism (3) is installed on the frame (2), and the wet mixing ball milling mechanism (3) comprises a motor (301), a gear transmission structure (302), a roller (303), a discharge port (304), a sealing cover (305), a connecting piece (306), a stopper (307), a shunt pipe (308), a nozzle (309) and a connecting pipe (3010), and the output end of the motor (301) is connected to a rotating shaft on one side of the roller (303) through the gear transmission structure (302). The drum (303) is connected with a discharge port (304) at the bottom thereof, and the discharge port (304) is connected to a sealing cover (305) via a connecting piece (306); blocks (307) are distributed in an annular array on the inner wall of the drum (303); a shunt pipe (308) is provided inside the drum (303); nozzles (309) are distributed at equal intervals at the bottom of the shunt pipe (308); one end of the shunt pipe (308) is connected to one end of a connecting pipe (3010); the connecting pipe (3010) runs through the interior of a rotating shaft arranged on one side; and the other end of the connecting pipe (3010) is connected to an external pumping device.

10. The process for preparing a high-strength metal fitting made of carbon nanotube-modified aluminum alloy according to claim 9, characterized in that: A material storage box (4) is arranged below the material discharge port (304), and the material storage box (4) is slidably connected to the inside of the guide groove (5), and the guide groove (5) is symmetrically opened on the top of the base (1), and a filter net bag (6) is arranged between the material storage box (4) and the material discharge port (304), and the filter net bag (6) is fixedly connected to the side wall of the frame (2).

Images