CN109910318B - Method for enhancing metal/polymer connection strength by using interface in-situ composite phase - Google Patents
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Abstract
The invention relates to a method for enhancing the connection strength of metal/high polymer by using an interface in-situ composite phase, which comprises the steps of laying a layer of enhanced phase particles on a preset connection interface when a metal/high polymer component is not contacted, then contacting the metal with the high polymer component, heating the metal/high polymer interface and applying bonding pressure to the metal/high polymer component, transferring heat applied to the metal surface to the metal/high polymer interface, melting high polymers near the interface, in-situ compounding the high polymers with the enhanced phase particles at the interface, and forming the connection of the metal/enhanced phase particles/high polymers under the combined action of the heat and the bonding pressure. Compared with the prior art, the invention can greatly and stably improve the connection strength between the metal and the high molecular member and has the characteristics of simplicity, convenience and universality.
Description
Technical Field
The invention relates to metal/polymer connection, in particular to a method for enhancing the metal/polymer connection strength by using an interface in-situ composite phase.
Background
The metal and polymer composite structure has the advantages of light weight, high strength and high toughness, so that the metal and polymer composite structure is widely applied to the fields of automobile industry, aerospace, biomedical use and the like. At present, the connection mode of metal and polymer material has various processes such as mechanical connection, adhesion, connection based on frictional heat generation, connection based on vibration heat generation and connection based on an external heat source. Different connection processes can be selected for different metal/polymer combinations and specific process applications.
In general, mechanical connection has problems that stress concentration and connection relaxation are easy, and rivets increase the structural weight and the use cost, and adhesion also has problems that the joint life is short and the joint strength fluctuation is large under high temperature and acid corrosion environments. Therefore, a method of forming a connection by melting a polymer by heat generation at a metal/polymer interface is currently the mainstream of research.
Due to the differences in physical and chemical properties between metals and polymers, it is impossible to form a high-strength joint by mixing materials and forming intermetallic compounds like intermetallic welding, resulting in low joint strength (especially for polymers without polar groups, such as polyethylene). In general, the surface treatment of a metal or polymer surface is required to improve the joint performance, and the following studies have been made in the prior art:
patent publication No. CN103391828A discloses a method for joining a metal member and a plastic member, which uses a rotary tool to heat and join the metal and the polymer member by friction energy on the metal surface. In order to improve the connection strength, surface treatment methods of metal surface anodic oxidation and metal or polymer surface corona discharge are respectively used, and certain effect is achieved. The method limits the connecting process to the friction welding technology, and simultaneously limits the diameter D of the rotating tool to be 5 to 20 times of the thickness t of the metal member, so that the method has certain limitation, and simultaneously has poor connecting strength.
Patent publication No. CN104936763A discloses a method for producing a metal-resin bonded body and a metal-resin bonded body. In this method, a resin bonding layer having a thickness of 0.01 to 9mm and made of a thermoplastic resin having phase-melting property with a resin member is laminated on a bonding surface of a metal member in advance, and the resin bonding layer of the metal member and the bonding surface of the resin member are bonded by heating and melting the resin bonding layer and the bonding surface of the resin member. Although this method can improve the joint strength to some extent, the improvement is limited by the strength of the applied resin layer; in the process of bonding the metal and the resin layer by applying heat and pressure, it takes a long time, and a void may be generated by the thermal degradation of the resin bonding layer and the resin bonding layer may flow out of the bonding surface. In addition, the essence of the invention is still a connection process without interface treatment between metal and polymer and without adding a reinforcing phase to the interface, and although the added resin bonding layer can improve the wetting and bonding effects between metal and polymer, the upper limit of the joint strength is only the strength of the added resin layer. In conclusion, the invention is difficult to realize high efficiency and greatly improve the strength of the joint.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the method for enhancing the metal/polymer connection strength by using the interface in-situ composite phase, which has the advantages of simplicity, wide application range and good connection strength improvement effect.
The purpose of the invention can be realized by the following technical scheme: a method for enhancing metal/macromolecule connection strength by using interface in-situ composite phase is characterized in that when a metal/macromolecule component is not in contact, a layer of enhanced phase particles are laid on a preset connection interface, then the metal is in contact with the macromolecule component, the metal/macromolecule interface is heated and bonding pressure is applied to the metal/macromolecule component, heat applied to the metal surface is transferred to the metal/macromolecule interface and then melts macromolecules nearby the interface, so that the macromolecules are in-situ composite with the enhanced phase particles at the interface, and the metal/enhanced phase particles/macromolecules are connected under the combined action of the heat and the bonding pressure.
The invention can select different metal components according to actual needs, including but not limited to: metals or alloy materials such as aluminum alloy, steel, copper and copper alloy, titanium and titanium alloy, and the like.
The polymer material used in the present invention is a thermoplastic polymer, which can be melted by repeated heating and can flow after being softened at a high temperature, and includes but is not limited to: polyethylene, polyetheretherketone, polyphenylene sulfide, polyethylene terephthalate, and the like.
The reinforced phase particles are particles with high melting point and high strength and are well combined with a polymer matrix interface, and the reinforced phase particles comprise: carbon nanotube, graphite oxide, graphene, boron nitride silicon dioxide or metal oxide particles, wherein the metal oxide comprises powder particles of aluminum oxide, iron oxide, titanium dioxide and the like. Carbon nanotube powder is preferred. The carbon nano tube has good electric conduction and heat conduction performance, excellent mechanical property and elastic modulus, and can improve the surface energy of the material after being compounded with the polymer and promote the connection between the carbon nano tube and the metal.
The reinforcing phase particles should be deposited on the surface of the underlying component, depending on the relative position of the metal surface or the polymer surface. The thickness of the reinforcing phase particles is 0.005 mm-2 mm.
In particular, when carbon nanotubes, graphite oxide, or graphene are selected as the reinforcing phase particles, in order to achieve a better dispersion effect at the metal/polymer interface, it is necessary to perform a uniform dispersion treatment before the addition. The dispersion treatment method comprises the following steps: grinding in a mortar; performing high-energy ball milling in a ball mill (the ball milling time is 1-10 min); preparing suspension in water or ethanol, performing ultrasonic treatment, and drying.
In particular, when carbon nanotubes are selected as the reinforcing phase particles, the length of the carbon nanotubes is preferably between 1 μm and 50 μm, and the diameter is preferably between 10nm and 100 nm. In order to promote the loading effect and the connection capacity of the metal and the polymer surface, the carboxylated carbon nanotube is preferable.
The method for laying the reinforcing phase particles on the connecting interface comprises the following three steps:
A. directly laying on the surface of the component;
B. coating the component surface with polymer gel, and drying at high temperature with a hot air gun; wherein the components of the polymer gel are similar to those of the polymer to be connected;
C. the polymer powder with the same or similar melting point as the polymer component to be connected is firstly compounded with the reinforcing phase particles to prepare the film, and the film is fixed between the metal to be connected and the polymer as an interlayer.
In the present invention, the metal/polymer members are connected by heating the metal/polymer interface and applying a bonding pressure to the metal/polymer members, and the methods that can be selected include, but are not limited to, the following:
the friction welding method based on friction heat generation comprises the following steps: after the metal and the polymer are overlapped up and down, a rotary tool is used for generating heat by friction on the surface of the metal, the generated heat is conducted to the metal/polymer interface and melts and softens the polymer, so that the reinforcing phase particles distributed on the interface are compounded with the melted and flowing polymer in situ and are tightly connected with the metal under the action of the downward pressure of the rotary tool.
The ultrasonic welding method based on vibration heat generation comprises the following steps: after the metal and the polymer are overlapped up and down, a vibration pressure head is used for pressing the surface of the metal and applying pressure. The vibration pressure head is connected with an ultrasonic generator, and the ultrasonic generator converts electric energy into mechanical motion and transmits the mechanical motion to the vibration pressure head to enable the vibration pressure head to vibrate at high frequency. The high-frequency vibration is transmitted to a metal/polymer connecting interface, and the metal and the polymer part generate violent frictional heat because of different acoustic resistances, so that the polymer is melted and softened, reinforcing phase particles distributed at the interface are compounded with the melted and flowing polymer in situ, and are tightly connected with the metal under the action of the lower pressure of the vibration pressure head.
The heating method based on the external heat source comprises the following steps: the metal and the polymer are overlapped (the vertical order of the arrangement is not limited), then the metal and the polymer are fixed on a workbench, a fastening bolt is used for applying certain pressure, and an external heat source is used for heating a metal/polymer interface. Including but not limited to: the method comprises the steps of electrifying resistance heating in a metal plate, generating heat on the surface of the metal plate or the surface of a polymer by using a high-energy laser beam, placing one side of the metal plate or the polymer plate on a heating plate for heating, heating the position of an interface by using a hot air gun, and the like. Under the heating of an external heat source, heat is conducted to the interface position of the metal/polymer to melt and soften the polymer, and reinforcing phase particles distributed at the interface are compounded with the molten and flowing polymer in situ to form tight connection with the metal.
The mixing and heating method comprises the following steps: after the connecting device is built according to the method based on frictional heat generation or external heat source heating in the connecting process, a vibration pressure head is used for pressing and applying pressure on the upper surface of the metal plate. And the heating effect is enhanced by simultaneously using an ultrasonic welding method in the heating process. Meanwhile, as the local friction between metal/high polymer at the interface is more severe, the enhanced phase particles can be more uniformly dispersed and compounded in the interface in situ, thereby improving the strengthening effect on the strength of the joint.
The method of mixing and heating is preferably adopted in the invention, so that the high-frequency friction between members at the interface can be promoted while the metal/polymer interface is efficiently heated, the reinforced phase particles can be uniformly dispersed and effectively compounded in situ at the interface, and the reinforcing effect is improved.
The above heating methods select proper interface connection temperature according to different types of metal/polymer components. Generally, the interfacial bonding temperature should be above the melting temperature of the polymer and below the temperature at which the polymer thermally degrades in air.
The heat applied on the metal surface is transferred to the interface to raise the interface temperature to be higher than the melting point of the polymer and lower than the melting temperature of the metal and the reinforcing phase particles.
When the friction welding method based on the heat generation of friction is used for connecting metal/high polymer, the rotating speed of the adopted rotating tool is 500-4000 revolutions per minute, and the connecting time is 5-60 s.
When connecting metal/polymer by ultrasonic welding method based on vibration heat generation, optimized vibration parameters are selected according to different metal/polymer components, generally, the ultrasonic vibration frequency is 5-40 kHz, and the processing time is 0.5-30 s.
When the metal/high molecular member is not contacted, a rough surface is manufactured on the metal surface by adopting a three-dimensional printing, sand blasting, acid etching or etching mode, and/or the high molecular surface is modified by adopting an ion surface treatment or ultraviolet irradiation method.
The metal/macromolecule connection interface is of a plane structure or an arbitrary curved surface structure.
Compared with the prior art, the method for reinforcing the metal/polymer connecting joint in situ by using the composite phase has the following advantages:
1) according to the invention, the strength of the metal/polymer connecting joint is effectively improved through the pinning effect of the reinforcing phase particles on the interface by adding the reinforcing phase particles on the metal/polymer connecting interface, and compared with other metal or polymer surface treatment methods, the method does not need a pretreatment process before connection, and is simple, convenient, effective and convenient.
2) The invention does not excessively limit the types of the used metal and the high polymer component, provides a universal joint strengthening method, and reduces the difficulty of implementation and research of the connection method.
Drawings
FIG. 1 is a schematic view of the process of the present invention applied to friction spot welding;
FIG. 2 is a schematic view of the process of the present invention applied to thermocompression bonding;
FIG. 3 is a schematic diagram of an interface connection mechanism according to a preferred embodiment of the invention.
FIG. 4 is a schematic view of the process of the present invention applied to friction wire bonding.
Wherein, 1 is a titanium alloy plate, 2 is a carboxylated carbon nanotube, 3 is a polyethylene plate, and 4 is a rotary tool; 5 is a pressure head; 6 is a conductive heating carbon brush; 7 (dotted line) is the direction of the interfacial fracture; 8 (direction) is the advancing direction of the rotating tool in the friction wire welding process; and 9 is a welding seam left by the rotating tool in the friction wire welding process.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
In addition, in each of examples 1 to 3 of the present invention, a titanium alloy sheet having a length of 60mm, a width of 20mm and a thickness of 3mm and a polyethylene sheet having a length of 60mm, a width of 20mm and a thickness of 6mm were used as the metal/polymer sheet materials to be joined.
Example 1:
the method of the invention is applied to the friction spot welding connection of titanium alloy/polyethylene, and the connection process is shown as the attached figure 1. Before joining, the titanium alloy surface was polished smooth using sandpaper and ultrasonically cleaned using deionized water. The carboxylated carbon nanotubes having an average diameter of 50nm and a length of 10 μm were sufficiently ground in a mortar to be uniformly dispersed.
The polyethylene plate 3 is fixed on a workbench, and a layer of carboxylated carbon nanotubes 2 is uniformly paved on a connection area with the length of 25mm and the width of 20mm, wherein the paving thickness is about 0.01 mm.
Covering the titanium alloy plate 1 on the macromolecule-carbon nano tube, and clamping and fixing.
The rotary tool 4 was started to rotate at 700 rpm and rapidly pressed down to contact the surface of the titanium alloy sheet 1, and then pressed down at 0.1mm/s for 5 seconds and pressed down to a depth of 0.5mm and then rotated for 30 seconds, and the joining was completed.
And (4) performing a shear tensile test on the joint obtained by connection, wherein the obtained maximum connection strength reaches 850N, and fracture occurs at a connection interface. On one side of the titanium alloy section, more residual polymer is covered. In contrast, the shear tensile strength of the joint without the addition of carbon nanotubes at the interface was only 120N, and there was almost no residual polyethylene adhesion at the titanium alloy section. The reason why the untreated joint is low in strength is that polyethylene has no polar group and thus is very difficult to react with the surface of the titanium alloy to form a bond.
And performing scanning electron microscope characterization after cutting the cross section of the titanium alloy/polyethylene joint. The carbon nanotubes at the interface are all inserted deeper into the polyethylene side. In a shear tensile test, the carbon nanotubes pinned near the interface effectively improve the joint strength, and the fracture at the interface is hindered. Meanwhile, the carbon nano tube well promotes the surface energy of the macromolecule, so that the macromolecule is more easily connected with metal in a wetting mode. Most of the fracture occurs at the polymer parent material position.
The metal and the polymer used in this embodiment are both flat plates, and in other embodiments, they may be curved surfaces or any design shapes.
Example 2:
the method is applied to resistance hot-pressing connection of titanium alloy/polyethylene, and the connection process is shown in figure 2. The titanium alloy surface is polished smooth and cleaned according to the pretreatment method in embodiment 1, and the carboxylated carbon nanotubes are fully ground.
The titanium alloy plate 1 is placed on a workbench and fixed by conductive heating carbon brushes 6 connected with a direct current motor at two sides. And a layer of carboxylated carbon nanotubes 2 is uniformly paved on the connecting area with the length of 25mm and the width of 20mm, and the paving thickness is about 0.1 mm.
The polyethylene plate 3 is fixed under a ram 5 suspended above the table.
The motor current was set to 100A and the motor was turned on. The titanium alloy plate 1 is heated after the current passes through the carbon brush. And (3) testing the surface temperature of the titanium alloy plate 1 to 250 ℃ by using an infrared thermometer, moving a pressure head 5 to press down quickly until the polyethylene plate 3 is contacted with the surface of the titanium alloy plate 1, and then slowly pressing down for 0.5mm and keeping for 30 seconds.
And stopping heating after 30 seconds, waiting for the joint to be naturally cooled, and performing a shear tensile test on the joint obtained by connection to obtain the maximum connection strength of 680N, wherein breakage occurs at a connection interface. On one side of the titanium alloy section, more residual polymer is covered.
Microscopic characterization of the titanium alloy/polyethylene interface was similar to that described in example 1, with the carbon nanotubes uniformly intercalated in the polyethylene. The pinning effect of the carbon nanotubes and the effect of the carbon nanotubes on the surface modification of the polymer are main mechanisms for improving the strength of the joint.
Example 3:
the method is applied to the friction welding connection of titanium alloy/polyethylene.
It is to be noted that the titanium alloy sheet used in the present example produced regular honeycomb two-dimensional roughness structures on the surface using a three-dimensional printing technique. The pore size of the honeycomb structure was 1.2mm and the thickness was 0.5 mm.
The connection process is shown in figure 1. The carboxylated carbon nanotubes are fully ground as described in embodiment 1. 1g of carbon nano tube is dispersed in 100ml of polyvinyl alcohol aqueous solution gel, and after drying, the gel is pressed into a macromolecule-carbon nano tube gel layer with the thickness of 2 mm.
The polyethylene plate 3 is fixed on a workbench, a layer of the polymer-carbon nanotube gel layer is uniformly laid on a connecting area with the length of 25mm and the width of 20mm, and the connecting area is fully dried by a hot air gun.
And covering the rough layer of the three-dimensional printed titanium alloy plate 1 downwards on the polymer-carbon nano tube, and clamping and fixing the rough layer.
The rotary tool 4 was started to rotate at 700 rpm and rapidly pressed down to contact the titanium alloy surface, and then pressed down at 0.1mm/s for 5 seconds and pressed down to a depth of 0.5mm and then kept rotating for 30 seconds. The connection is ended.
And performing a shearing and stretching test on the joint obtained by connection, wherein the obtained maximum connection strength reaches 2320N, no fracture occurs at the interface, and the yield occurs at the side of the polymer parent metal. In contrast, the splice shear tensile strength without carbon nanotubes added at the interface was 1670N, with fracture occurring at the interface.
And performing scanning electron microscope characterization after three-dimensional printing of the cut sample of the cross section of the titanium alloy/polyethylene joint. The schematic diagram of the characterization result is shown in the attached FIG. 3. The characterization result shows that at the interface between the rough surface and the polyethylene, the carbon nanotubes near the interface are deeply inserted into the polyethylene side, and a small amount of carbon nanotubes are inserted into the metal side. The reason why the carbon nanotube is inserted into the metal side is that the titanium alloy surface after three-dimensional printing has a loose oxide layer, so that the carbon nanotube and the polymer can be inserted under the action of lower pressure. The high-strength joint has the advantages that in a shear tensile test, the carbon nano tubes pinned near the interface effectively improve the strength of the joint, so that the fracture at the interface is blocked. The joint obtains extremely high shear tensile strength under the combined action of strong macroscopic occlusion caused by the connection of the three-dimensional printing coarse structure and the polymer and the pinning action of the carbon nano tube at the interface.
Example 4
The method of the invention is applied to the friction wire welding connection of titanium alloy/polyethylene, and the connection process is shown in figure 4. Before joining, the titanium alloy surface was polished smooth using sandpaper and ultrasonically cleaned using deionized water. The carboxylated carbon nanotubes having an average diameter of 50nm and a length of 10 μm were sufficiently ground in a mortar to be uniformly dispersed.
The polyethylene plate 3 is fixed on a workbench, and a layer of carboxylated carbon nanotubes 2 is uniformly paved on a connection area with the length of 25mm and the width of 20mm, wherein the paving thickness is about 0.01 mm.
Covering the titanium alloy plate 1 on the macromolecule-carbon nano tube, and clamping and fixing.
The rotation tool 4 was started at 1000 rpm and rapidly pressed down to contact the surface of the titanium alloy sheet 1, and pressed down at 0.1mm/s for 5 seconds and pressed down to a depth of 0.5mm and then kept rotating for 10 seconds. After which it is advanced in the direction of advance 8 for 60 seconds at a welding speed of 50mm/min, leaving a weld 9 of length up to 50mm, and stops rotating after 5 seconds of dwell at the end point, and the connection is ended.
And cutting and sampling the vertical welding line to obtain a tensile sample with the width of 1cm, carrying out a shearing tensile test on the tensile sample, wherein the obtained maximum connection strength reaches 680N, and fracture occurs at a connection interface. One side of the titanium alloy section is covered by residual macromolecules. In contrast, a joint without carbon nanotubes added at the interface was broken at the time of cutting, and no connection could be formed, while there was almost no residual polyethylene adhesion at the titanium alloy cross section.
Similar to embodiment 1, the carbon nanotubes pinned near the interface effectively improved the joint strength in the shear tensile test, and the breakage at the interface was hindered. Meanwhile, the carbon nano tube well promotes the surface energy of the macromolecule, so that the macromolecule is more easily connected with metal in a wetting mode. Most of the fracture occurs at the polymer parent material position.
The metal and the polymer used in this embodiment are both flat plates, and in other embodiments, they may be curved surfaces or any design shapes.
Example 5
In this example, the metal used was stainless steel, the polymer material was polyetheretherketone, and the reinforcing phase particles were graphite oxide, and the friction welding process described in example 1 was used for the connection. Due to the higher melting temperature of the polyetheretherketone, the rotational speed of the stirring tool used was 1500 rpm, and the remaining process parameters were the same as in example 1.
And performing a shear tensile test on the joint obtained by connection, wherein the obtained maximum connection strength reaches 1800N, the fracture occurs at an interface, and more polymer residues are left on the metal plate side. In contrast, the joint shear tensile strength without graphite oxide added at the interface was 160N, the fracture occurred at the interface, and the metal plate was smooth without adhesion of high polymer due to the high melting temperature of polyetheretherketone and difficulty in bonding with metal.
The characterization result of a scanning electron microscope on the section shows that the graphite oxide is lamellar and is uniformly distributed in the polymer residue on the metal surface, a good pinning effect is formed between the graphite oxide and the metal and the polymer, and the metal and the polymer are more fully microcosmically connected due to the interface modification effect of the graphite oxide on the polymer, so that the interface connection strength is effectively improved.
Example 6
In this example, the metal selected was pure copper, the polymer material was polyethylene terephthalate, and the reinforcing phase particles were graphene, and the connection was performed using the friction welding process described in example 1. The speed of the stirring tool used was 1500 rpm, as in example 1.
And performing a shear tensile test on the joint obtained by connection, wherein the obtained maximum connection strength reaches 2540N, the interface is not broken, and the yield occurs on the side of the polymer base material. In contrast, the joint shear tensile strength without graphene added to the interface was 1385N, and the fracture occurred at the interface, and only a local region of the interface had a polymer residue. Due to the good light transmission of the polyethylene terephthalate, the graphene can be uniformly distributed at the joint in the copper/polymer joint with the graphene added in situ.
Example 7
In the embodiment, the selected metal is aluminum alloy, the high polymer material is polyphenylene sulfide, the enhanced phase particles are boron nitride particles, when the aluminum alloy/polyphenylene sulfide are not contacted, a rough surface is manufactured on the surface of the aluminum alloy in an acid etching mode, and the surface of the polyphenylene sulfide is modified by a plasma surface treatment method to enable the surface of the polyphenylene sulfide to have a small amount of polar groups generated by oxidation.
After surface modification of the metal and polymer, the connection was made using the friction welding process described in example 1. The speed of the stirring tool used was 1500 rpm, as in example 1.
And performing a shearing and stretching test on the joint obtained by connection, wherein the obtained maximum connection strength reaches 3310N, no fracture occurs at the interface, and the yield occurs at the side of the polymer parent metal. In contrast, the shear tensile strength of the joint without the boron nitride particles added at the interface was 1320N, and fracture occurred at the interface. This also indicates that the interface in-situ composite can be promoted by surface modification to enhance the strength of the metal/polymer connection joint.
The present invention is not limited to the kinds of metals and polymers, the kinds and sizes of particles to which the reinforcing phase is added, the joining method and joining process parameters, etc., and those skilled in the art can make many modifications and variations according to the present invention. Therefore, all technical solutions that can be obtained by logical analysis, reasoning or experiment according to the concept of the present invention by those skilled in the art are within the scope of protection defined by the claims.
Claims (9)
1. A method for using interface in-situ composite phase to enhance metal/macromolecule connection strength is characterized in that when a metal/macromolecule component is not in contact, a layer of enhanced phase particles are laid on a preset connection interface, then the metal is in contact with the macromolecule component, the metal/macromolecule interface is heated and bonding pressure is applied to the metal/macromolecule component, heat applied to the metal surface is transferred to the metal/macromolecule interface and then melts macromolecules nearby the interface, so that the macromolecules are in-situ composite with the enhanced phase particles at the interface, and the metal/enhanced phase particles/macromolecules are connected under the combined action of the heat and the bonding pressure; the reinforcing phase particles comprise: the carbon nano tube/boron nitride/silicon dioxide/metal oxide particles, wherein the metal oxide comprises aluminum oxide, iron oxide or titanium dioxide powder particles, and the thickness of the reinforcing phase particles is 0.005 mm-2 mm.
2. The method of claim 1, wherein the reinforcing phase particles are carbon nanotube powder.
3. The method for enhancing metal/polymer connection strength by using the interfacial in-situ composite phase according to claim 1, wherein the method for laying the reinforcing phase particles on the connection interface comprises the following three methods:
A. directly laying on the surface of the component;
B. coating the component surface with polymer gel, and drying at high temperature with a hot air gun; wherein the components of the polymer gel are similar to those of the polymer to be connected;
C. the polymer powder with the same or similar melting point as the polymer component to be connected is firstly compounded with the reinforcing phase particles to prepare the film, and the film is fixed between the metal to be connected and the polymer as an interlayer.
4. The method of claim 1, wherein the method of heating the interface between the metal and the polymer is a friction welding method based on heat generation of friction, an ultrasonic welding method based on heat generation of vibration, a heating method based on an external heat source, or a hybrid heating method in which two or more heating methods are mixed.
5. The method as claimed in claim 1, wherein the heat applied to the metal surface is transferred to the interface to raise the temperature of the interface to a temperature higher than the melting point of the polymer and lower than the melting temperature of the metal and the particles of the reinforcing phase.
6. The method for enhancing the bonding strength of metal/polymer by using the interfacial in-situ composite phase according to claim 4, wherein when the metal/polymer is bonded by the friction welding method based on the heat generation of friction, the rotating speed of the rotating tool is 500-4000 rpm, and the bonding time is 5-60 s.
7. The method for enhancing the bonding strength of metal/polymer by interfacial in-situ composite phase according to claim 4, wherein the metal/polymer is bonded by ultrasonic welding based on vibration heat generation, the ultrasonic vibration frequency is 5 to 40kHz, and the treatment time is 0.5 to 30 s.
8. The method for enhancing the bonding strength of metal/polymer by using the interfacial in-situ composite phase according to claim 1, wherein the metal/polymer member is not contacted, a rough surface is produced on the metal surface by three-dimensional printing, sand blasting, acid etching or etching, and/or the polymer surface is modified by ion surface treatment or ultraviolet irradiation.
9. The method of claim 1, wherein the metal/polymer connection interface has a planar structure or an arbitrary curved structure.
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| CN110722802A (en) * | 2019-09-26 | 2020-01-24 | 沈阳航空航天大学 | Connecting method of light alloy and thermoplastic composite material based on ultrasonic assistance |
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| US20020027155A1 (en) * | 2000-02-24 | 2002-03-07 | Hisanori Okamura | Friction stir welding method |
| CN102239027A (en) * | 2008-12-09 | 2011-11-09 | 日本轻金属株式会社 | Method for joining resin member with metal member, and liquid-cooled jacket manufacturing method |
| JP2010269534A (en) * | 2009-05-22 | 2010-12-02 | Taisei Plas Co Ltd | Bonded composite containing metal, and method for manufacturing the same |
| CN101914735A (en) * | 2010-07-20 | 2010-12-15 | 南昌大学 | Method for preparing aluminum composite material reinforced with carbon nano tubes by ultrasonic welding |
| CN105365232A (en) * | 2014-08-06 | 2016-03-02 | 通用汽车环球科技运作有限责任公司 | Mechanical interlocking realized through induction heating for polymeric composite repair |
| CN105397268A (en) * | 2015-11-14 | 2016-03-16 | 华文蔚 | Method for preparing carbon nanotube reinforced aluminum matrix composite through ultrasonic welding |
| CN108188668A (en) * | 2018-01-29 | 2018-06-22 | 陕西天元智能再制造股份有限公司 | A kind of manufacturing method of the metal-base composites of graphene-containing interlayer |
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