CN111215739A - Method for preparing resistance welding heating element by using carbon fiber treated by plasma - Google Patents
Method for preparing resistance welding heating element by using carbon fiber treated by plasma Download PDFInfo
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- CN111215739A CN111215739A CN202010013372.3A CN202010013372A CN111215739A CN 111215739 A CN111215739 A CN 111215739A CN 202010013372 A CN202010013372 A CN 202010013372A CN 111215739 A CN111215739 A CN 111215739A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/31—Electrode holders and actuating devices therefor
- B23K11/314—Spot welding guns, e.g. mounted on robots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
- D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/16—Composite materials, e.g. fibre reinforced
Abstract
A method for preparing a resistance welding heating element by using carbon fiber treated by plasma comprises the following steps: (1) putting the carbon fiber into a solvent for ultrasonic cleaning, taking out and drying; (2) carrying out plasma treatment on the dried carbon fiber; (3) cutting the carbon fiber after plasma treatment into carbon fiber bundles, infiltrating resin into the carbon fiber bundles by adopting a pre-immersion method, spreading the infiltrated fiber bundles on an aluminum alloy sheet, and putting the aluminum alloy sheet into an oven for drying to obtain the heating element. The method can be applied to the connection and assembly of large composite material structures with complex curved surfaces, and has wide application prospect in the composite material connection field of aviation, aerospace, automobiles and the like.
Description
Technical Field
The invention belongs to the technical field of composite material connection, and particularly relates to a method for preparing a resistance welding heating element by using carbon fibers treated by plasma.
Background
The advanced composite material is a multiphase material prepared by compounding high-performance continuous fibers and polymers through a specific process, has the characteristics of light weight, high strength and high modulus, high temperature resistance, fatigue resistance, designability, dimensional stability and the like, and has replaced aviation aluminum materials to become a preferred material of an aviation aerospace main bearing structure. With the continuous progress of composite molding technology, the development of advanced composite components is striving to achieve structural integrity. However, due to the limitations of structural design and process, certain structural separation surfaces and process separation surfaces still need to be arranged, so that the assembly and connection between the components are indispensable links. The traditional connecting method between the composite material parts mainly comprises the following steps: gluing and mechanical joining. The mechanical connection of the composite materials has the advantages of easy quality control, convenient loading and unloading, safety, reliability, small strength dispersion, good load transfer performance and the like; meanwhile, the defects of stress concentration, low connecting efficiency, weight increase of fasteners and the like caused by the holes exist; mechanical joints typically add about 20% to the weight of the structural member. The part is connected into a non-detachable whole by the adhesive, the part is different from mechanical connection, the part is not required to be perforated in the adhesive connection, and the part connecting structure has the advantages of high efficiency and light structural weight, and is very suitable for connecting special-shaped, heterogeneous, thin-walled and complex parts. But the quality control of the glue joint is difficult; the curing time is long; the adhesive joint performance is susceptible to the environment (wet, hot, corrosive media); generally not detachable after the glue joint.
In order to overcome the problems of the composite material cementing process and the mechanical connection, the composite material welding technology is developed in recent years; it is mainly a process of converting energy of electricity, light, electromagnetism, ultrasound, etc. into heat, heating two or more kinds of same kind or different kind materials to melt or plastically deform the parent material, and connecting them into one body by combining and diffusing atoms or molecules. Welding technology is a very fast and short cycle joining technique in the assembly and repair of aircraft composite parts.
The resistance implantation welding technology (short for resistance welding) has the advantages of simple equipment, convenient operation, high heating speed and the like, and is an ideal welding method for the thermoplastic composite material. The metal wire mesh is a heating element commonly used in the resistance welding process of the composite material, but the metal wire mesh and the advanced composite material are materials with different properties, so that a welding head can be led to introduce a dissimilar material after welding, particularly, the metal material is buried in resin to cause electrochemical corrosion, and meanwhile, because the metal material and the resin-based fiber composite material have larger thermal expansion coefficient difference, the welding head can be caused to generate unstable stress concentration to form unavoidable internal stress, and the original high connection property of the welding head is finally damaged.
Therefore, selecting carbon fibers of the same material as the composite material as the heating element for electric resistance welding avoids these problems to the greatest extent. Since carbon fibers have better wettability and thermal expansion coefficient to the resin matrix than metal mesh has, carbon fibers are more suitable as heating elements for resistance welding than metal mesh. In order to further enhance the welding strength of carbon fibers as heating elements for resistance welding, it is necessary to improve the wettability of carbon fibers to a resin matrix, and acid-base corrosion, ultrasonic surface treatment, in-situ surface growth of carbon nanotubes, and the like have been proposed in the prior art, but no method has been proposed for enhancing the strength of a resistance welding joint by modifying the surface of carbon fibers by plasma treatment. Experiments prove that the low-temperature plasma treatment technology is an effective method for effectively improving the surface performance of aramid fibers and improving the wettability of the fibers and a resin matrix. After plasma treatment, a large number of polar groups are introduced into the surface of the fiber, and the polar groups can form stable chemical bonds with a resin matrix; meanwhile, a large number of pits appear on the surface of the fiber after plasma treatment, the pits are etching pits caused by rearrangement and inversion of polar groups on the surface of the fiber after plasma treatment or volatilization of reactive gas generated by the polar groups and active particles in the air, and due to the existence of the pits, the roughness of the surface of the fiber is further improved, the mechanical self-locking capability between resin and the fiber is enhanced, and thus the mechanical property of a welding head is enhanced. Therefore, the development of the method for enhancing the strength of the welding head by treating the carbon fibers with the plasma has important practical significance.
The invention aims to enhance the strength of a welding head by treating carbon fibers with plasma, takes the carbon fibers treated with the plasma as a heating element, and synchronously improves the bonding strength of a heating element and a resin interface by utilizing polar groups and pits on the surface of the treated carbon fibers. The invention is expected to have wide application prospect in the fields of aerospace, transportation and transportation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for preparing a resistance welding heating element by using carbon fibers treated by plasma.
The technical scheme of the invention is as follows:
enabling the surface of the fiber to be rich in polar groups and forming a large number of pits on the surface of the fiber through a low-temperature plasma treatment process, further using the carbon fiber treated by plasma as a heating element for resistance welding of composite materials, coating two thermoplastic resin films on the surface of the carbon fiber, and then implanting the carbon fiber into a lap joint area of the two composite materials; the two ends of the carbon fiber are electrified, the generated joule heat enables the thermoplastic resin film to be melted and filled in the gap of the welding area and bonds the composite materials at the two sides, and the high-strength composite material resistance welding joint is obtained after cooling. Due to the unique conductive heating and heat transfer effects of the carbon fibers, the heating element surface heating is more uniform, the effective heat transfer area is increased, and the improvement of the resin melting state in a welding area is facilitated; meanwhile, the carbon fiber and the composite material are made of the same material, so that unnecessary electrochemical corrosion and stress concentration are avoided, the interface bonding strength between the heating element and the resin is reserved, and the strength of the welding head is improved. The method is simple and quick, has extremely low cost, and has wide application prospect in the connection field of thermoplastic composite materials such as aviation, aerospace, automobiles and the like.
The invention relates to a carbon fiber heating element treated by plasma, the surface of which is carbon fiber rich in polar groups, rough streaks and pits, wherein the streaks and pits on the surface of the fiber are caused by rearrangement and inversion of the polar groups after plasma treatment or volatilization of reactive gases generated by the polar groups and active particles in the air, the average width of the streaks is about 1-3 mu m, and the average diameter of the pits is about 2-3 mu m.
The invention discloses a method for preparing a resistance welding heating element by using carbon fibers treated by plasma, which comprises the following steps:
step 1, cleaning carbon fibers:
winding carbon fibers on a glass frame, then flatly placing the frame in a container filled with an organic solvent, then placing the container in an ultrasonic vibration cleaning machine, ultrasonically cleaning for 6-12h, taking out and placing in an oven for drying; wherein the drying temperature is 60-80 ℃, and the drying time is 4-6 h;
step 2, plasma treatment:
fixing the dried glass frame wound with the carbon fibers in a low-temperature closed container for plasma treatment, so that the surface of the carbon fibers is rich in polar groups, rough streaks and pits; wherein the gas flow is 30-40cm3Min, setting the operating pressure to be 30-60Pa, setting the power to be 120-240w, and setting the plasma treatment time to be 10-60 min;
cutting the carbon fiber treated by the plasma into carbon fiber bundles with the length of 40-60mm, fixing two ends of the carbon fiber bundles, infiltrating resin into the middle of the carbon fiber bundles by adopting a pre-immersion method, wherein the length of the infiltrated part is 25-30mm, extruding excessive resin in the carbon fiber bundles, enabling the resin among fiber bundle layers to be uniform as much as possible and maintaining the original flat state of the carbon fiber bundles, and finally spreading the infiltrated carbon fiber bundles on an aluminum alloy sheet, putting the aluminum alloy sheet into an oven and drying to obtain a heating element; wherein the drying temperature is 80-120 ℃, and the drying time is 6-12 h.
The upper surface and the lower surface of the heating element prepared by the method are respectively coated with a thermoplastic resin film, the areas to be welded of the lap joint of the resistance welding of the composite material are implanted, then the electric heating is carried out after a certain pressure is applied, and the high-strength resistance welding joint of the composite material is obtained after cooling. The joule heat generated during the welding causes the resin on the surface of the fiber and the thermoplastic resin film to melt and fill the voids in the welded area and to adhere to each other.
The method for preparing the electric resistance welding heating element by using the carbon fiber treated by the plasma comprises the following steps:
the organic solvent in the step 1 is any one of acetone, ethanol, pyridine and phenol.
The carbon fiber in the step 1 is any one or a mixture of two of T300, T300J, T400H, T600S, T700C, T800H and T1000G, preferably T700C; the diameter of the carbon fiber is 6-7 μm, preferably 7 μm; the number of pores of the carbon fiber is 1 to 24k, preferably 3 k.
In the plasma processing method in step 2, the plasma is a low-temperature plasma, and the gas for exciting the plasma in the inductively coupled radio frequency generator is any one of air, oxygen with a purity of 99.999%, argon with a purity of 99.999%, and nitrogen with a purity of 99.999%.
The pre-dipping method adopted in the step 3 is that the resin is firstly dissolved in a certain amount of solvent, the two ends of the fiber bundle are fixed by a clamp to be suspended, and then the resin solution is dripped into the fiber bundle; wherein the solvent for dissolving the resin is any one of benzene, toluene, pentane, hexane, cyclohexane, chlorobenzene, methanol, ethanol, diethyl ether, methyl acetate, acetone, ethylene glycol monomethyl ether, pyridine and phenol; the resin is any one of Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), Polystyrene (PS), Polyamide (PA), Polyoxymethylene (POM), Polycarbonate (PC) and Polyetherimide (PEI).
The aluminum alloy sheet in the step 3 has any one of model numbers 1060, 2A12, 2024, 3003, 3A21, 5A02, 5052, 5754, 6061, 6063 and 7075; wherein the aluminum alloy thin plate has a thickness of 0.3-0.5mm, a length of 100-300mm and a width of 100-300 mm.
The invention has the beneficial effects that:
(1) the carbon fiber is used as the heating element, so that the heating and heat transfer performances of the heating element can be improved, the heat transfer efficiency of the heating element is improved, and the quality of a welding head is reduced; meanwhile, as the carbon fiber is the same material as the composite material, the carbon fiber can effectively avoid the defects of electrochemical corrosion, internal stress caused by thermal expansion difference and the like easily generated by the metal mesh implant as a heating element.
(2) According to the invention, the surface of the carbon fiber is treated by using plasma, so that abundant polar groups are attached to the surface of the carbon fiber serving as a heating element, and the polar groups can form stable chemical bonds with a resin matrix; meanwhile, a large number of pits appear on the surface of the fiber after plasma treatment, and due to the existence of the pits, the roughness of the surface of the fiber is further improved, the mechanical self-locking capacity between resin and the fiber is enhanced, and the mechanical property of a welding head with the carbon fiber as a heating element is improved.
(3) The invention can be applied to the connection of thermoplastic composite materials and can also be used for the connection of thermosetting composite materials with plasticized surfaces; meanwhile, the method can be applied to the connection and assembly of large composite material structures with complex curved surfaces, and has wide application prospects in the connection field of composite materials such as aviation, aerospace and automobiles.
(4) The resistance welding joint of the heating element prepared by the method of the invention has the tensile shear strength (LSS) of various composite materials with a single lap welding joint of 20-40MPa according to the difference of thermoplastic resin matrixes.
Drawings
Fig. 1 is an appearance view of a T300J carbon fiber heating element prepared in example 1 of the present invention.
FIG. 2 is a micro-topography of a plasma-treated modified T300J carbon fiber prepared in example 1 of the present invention.
FIG. 3 is a schematic view of an apparatus for manufacturing an electric resistance welding head using a T300J carbon fiber heating element manufactured in example 1 of the present invention: the device comprises a pressure sensor 1, a power supply 2, a first CF/PPS composite material 3, a first PPS film 4, a carbon fiber heating element modified by plasma 5, a second PPS film 6 and a second CF/PPS composite material 7.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for preparing a resistance welding heating element by using carbon fibers treated by plasma comprises the following specific implementation steps:
step 1, cleaning carbon fibers:
winding T300J carbon fiber on a glass frame, then placing the frame in a container filled with acetone in a flat manner, then placing the container in an ultrasonic vibration cleaning machine, performing ultrasonic cleaning for 8 hours, taking out and placing in an oven for drying; wherein the drying temperature is 70 ℃, and the drying time is 6 h; the diameter of the carbon fiber is 7 mu m, and the number of holes is 3 k;
step 2, plasma treatment:
fixing the dried glass frame wound with the T300J carbon fiber in a closed container in an argon protection environment with low temperature and purity of 99.999 percent, and carrying out plasma treatment to ensure that the surface of the T300J carbon fiber is rich in polar groups, rough streaks and pits; wherein the gas flow is 40cm3Min, the operating pressure is 50Pa, the power is 240w, and the plasma processing time is 25 min;
cutting the T300J carbon fiber after plasma treatment into carbon fiber bundles with the length of 40mm, fixing two ends of the fiber bundles, infiltrating resin into the middle of the fiber bundles by adopting a pre-immersion method, wherein the length of the infiltrated part is 25mm, extruding excessive resin in the fiber bundles, enabling the resin among fiber bundle layers to be uniform as much as possible and maintaining the original flat state of the fiber bundles, and finally spreading the infiltrated fiber bundles on an aluminum alloy sheet, putting the aluminum alloy sheet into an oven and drying to obtain a heating element; wherein the aluminum alloy plate is 5754, 0.3mm in thickness, 200mm in length and 200mm in width; the drying temperature is 120 ℃, and the drying time is 6 h; the resin adopted in the resin infiltration process is PPS, and the solvent for dissolving the resin is acetone.
The appearance of the T300J carbon fiber heating element prepared in this example is shown in fig. 1, and the microscopic morphology of the surface thereof is shown in fig. 2; it can be seen from FIG. 2 that many seam marks were generated on the surface of the fiber, and the width of the seam mark was 3 μm. Fig. 3 is a schematic view of an apparatus for manufacturing an electric resistance welding head using the T300J carbon fiber heating element manufactured in example 1. And respectively coating the upper surface and the lower surface of the heating element with PPS films to prepare a CF/PPS composite material resistance welding joint, wherein the LSS of the obtained CF/PPS composite material resistance welding joint reaches 32.5 MPa.
Example 2
A method for preparing a resistance welding heating element by using carbon fibers treated by plasma comprises the following specific implementation steps:
step 1, cleaning carbon fibers:
winding T700C carbon fiber on a glass frame, then placing the frame in a container filled with acetone in a flat manner, then placing the container in an ultrasonic vibration cleaning machine, carrying out ultrasonic cleaning for 8 hours, taking out and placing the container in an oven for drying, wherein the drying temperature is 80 ℃, and the drying time is 6 hours; the diameter of the carbon fiber is 7 mu m, and the number of holes is 3 k;
step 2, plasma treatment:
fixing the dried glass frame wound with the T700C carbon fiber in a closed container in a nitrogen protection environment with low temperature and purity of 99.999 percent, and carrying out plasma treatment to ensure that the surface of the T700C carbon fiber is rich in polar groups, rough streaks and pits; wherein the gas flow is 40cm3Min, the operating pressure is 60Pa, the power is 180w, and the plasma processing time is 30 min;
cutting the T700C carbon fiber after plasma treatment into a carbon fiber bundle with the length of 50mm, fixing two ends of the fiber bundle, infiltrating resin into the middle part of the fiber bundle by adopting a pre-immersion method, wherein the length of the infiltrated part is 30mm, extruding excessive resin in the fiber bundle to ensure that the resin among fiber bundle layers is as uniform as possible and the original flat state of the fiber bundle is maintained, and finally spreading the infiltrated fiber bundle on an aluminum alloy sheet, putting the aluminum alloy sheet into an oven and drying to obtain a heating element; the aluminum alloy plate is 2024 in type, 0.4mm in thickness, 200mm in length and 200mm in width; the drying temperature is 120 ℃, and the drying time is 8 hours; the resin adopted in the resin infiltration process is PEK, and the solvent for dissolving the resin is toluene.
The upper and lower surfaces of the T700C carbon fiber heating element prepared in this example 2 were respectively coated with PEK resin films to prepare a GF/PEK composite resistance weld joint, and the LSS of the obtained GF/PEK composite resistance weld joint was 38.4 MPa.
Example 3
A method for preparing a resistance welding heating element by using carbon fibers treated by plasma comprises the following specific implementation steps:
step 1, cleaning carbon fibers:
winding T800H carbon fiber on a glass frame, then placing the frame in a container filled with acetone in a flat manner, then placing the container in an ultrasonic vibration cleaning machine, ultrasonically cleaning for 8 hours, taking out and placing in an oven for drying, wherein the drying temperature is 70 ℃, and the drying time is 6 hours; the diameter of the carbon fiber is 7 mu m, and the number of holes is 3 k;
step 2, plasma treatment:
fixing the dried glass frame wound with the T800H carbon fiber in a closed container in an oxygen protection environment with low temperature and purity of 99.999 percent, and carrying out plasma treatment to ensure that the surface of the T800H carbon fiber is rich in polar groups, rough streaks and pits; wherein the gas flow is 30cm3Min, operating pressure of 40Pa, power of 200w and plasma treatment time of 40 min;
cutting the T800H carbon fiber after plasma treatment into a carbon fiber bundle with the length of 50mm, fixing two ends of the fiber bundle, infiltrating resin into the middle part of the fiber bundle by adopting a pre-immersion method, wherein the length of the infiltrated part is 25mm, extruding excessive resin in the fiber bundle to ensure that the resin among fiber bundle layers is as uniform as possible and maintain the original flat state of the fiber bundle, and finally spreading the infiltrated fiber bundle on an aluminum alloy sheet, wherein the aluminum alloy sheet is 5A02 in type, 0.5mm in thickness, 100mm in length and 100mm in width, and putting the aluminum alloy sheet into an oven for drying to obtain a heating element; wherein the drying temperature is 100 ℃ and the drying time is 8 h; the resin adopted in the resin infiltration process is PEI, and the solvent used for dissolving the resin is chlorobenzene.
The upper and lower surfaces of the T800H carbon fiber heating element prepared in this example 3 were respectively coated with PEI resin films to prepare a GF/PEI composite resistance weld joint, and the LSS of the obtained GF/PEI composite resistance weld joint was 37.8 MPa.
Claims (3)
1. A method for preparing a resistance welding heating element by using carbon fiber treated by plasma is characterized by comprising the following steps:
step 1, cleaning carbon fibers:
winding carbon fibers on a glass frame, then flatly placing the frame in a container filled with an organic solvent, then placing the container in an ultrasonic vibration cleaning machine, ultrasonically cleaning for 6-12h, taking out and placing in an oven for drying; wherein the drying temperature is 60-80 ℃, and the drying time is 4-6 h; the organic solvent is any one of acetone, ethanol, pyridine and phenol; the carbon fiber is any one or a mixture of two of T300, T300J, T400H, T600S, T700C, T800H and T1000G, the filament diameter of the carbon fiber is 6-7 mu m, and the number of pores of the carbon fiber is 1-24 k;
step 2, plasma treatment:
fixing the dried glass frame wound with the carbon fibers in a low-temperature closed container for plasma treatment, so that the surface of the carbon fibers is rich in polar groups, rough streaks and pits; wherein the gas flow is 30-40cm3Min, setting the operating pressure to be 30-60Pa, setting the power to be 120-240w, and setting the plasma treatment time to be 10-60 min; wherein the plasma is low-temperature plasma, and is used in an inductively coupled radio frequency generatorThe gas for exciting the plasma is any one of air, oxygen with the purity of 99.999 percent, argon with the purity of 99.999 percent and nitrogen with the purity of 99.999 percent;
step 3, preparing a heating element:
cutting the carbon fiber treated by the plasma into carbon fiber bundles with the length of 40-60mm, fixing two ends of the carbon fiber bundles, infiltrating resin into the middle of the carbon fiber bundles by adopting a pre-immersion method, wherein the length of the infiltrated part is 25-30mm, extruding excessive resin in the carbon fiber bundles, enabling the resin among fiber bundle layers to be uniform as much as possible and maintaining the original flat state of the carbon fiber bundles, and finally spreading the infiltrated carbon fiber bundles on an aluminum alloy sheet, putting the aluminum alloy sheet into an oven and drying to obtain a heating element; wherein the drying temperature is 80-120 ℃, and the drying time is 6-12 h; the aluminum alloy sheet is any one of 1060, 2A12, 2024, 3003, 3A21, 5A02, 5052, 5754, 6061, 6063 and 7075 in model number; the aluminum alloy thin plate has a thickness of 0.3-0.5mm, a length of 100-300mm and a width of 100-300 mm.
2. The method for producing an electric resistance welding heat generating element using the carbon fiber treated with plasma as claimed in claim 1, wherein the carbon fiber in the step 1 is preferably T700C; the diameter of the carbon fiber is preferably 7 μm; the number of pores in the carbon fiber is preferably 3 k.
3. The method for manufacturing an electric resistance welding heating element using plasma-treated carbon fibers according to claim 1, wherein the pre-dipping employed in the step 3 is a method of dissolving the resin in a certain amount of solvent while fixing both ends of the fiber bundle with clips to be suspended, and then dropping the resin solution into the fiber bundle; wherein the solvent for dissolving the resin is any one of benzene, toluene, pentane, hexane, cyclohexane, chlorobenzene, methanol, ethanol, diethyl ether, methyl acetate, acetone, ethylene glycol monomethyl ether, pyridine and phenol; the resin is any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyformaldehyde, polycarbonate and polyetherimide.
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| CN114496433A (en) * | 2022-01-19 | 2022-05-13 | 大连理工大学 | Preparation method of thermoplastic composite material resistance welding element based on plasma treatment |
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| CN114496433A (en) * | 2022-01-19 | 2022-05-13 | 大连理工大学 | Preparation method of thermoplastic composite material resistance welding element based on plasma treatment |
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