Metal material and non-metal material combined part and preparation method thereof

Abstract

The invention discloses a metal material and non-metal material combined part and a preparation method thereof. The preparation method comprises the steps that a metal base material is provided, a nanoscale pore structure is formed in the surface of the metal base material, and the pore diameter of the nanoscale pore structure ranges from 100 nm to 1000 nm; a thermoplastic fiber composite material in a molten state is formed on the surface of the metal base material through 3D printing, the nanoscale pore structure is filled with part of the thermoplastic fiber composite material, the thermoplastic fiber composite material comprises a thermoplastic material and continuous fibers, and the continuous fibers are made of a thermoplastic material. The mass content of the continuous fibers in the thermoplastic fiber composite material is 40%-80%. The preparation method is high in processing efficiency, the thermoplastic fiber composite material of a complex structure can be prepared, the binding force between the metal base material of the prepared combined part and the thermoplastic fiber composite material is large, and the thermoplastic fiber composite material is high in structural strength and good in appearance.

Description

Technical Field

[0001] The present invention relates to the technical field of material processing, and more particularly, to a combination of metal materials and non-metal materials and a preparation method thereof. Background Art

[0002] In related technologies, there are increasingly high requirements for the lightweight of structural parts of wearable products. In order to ensure that the structural parts have both lightweight and high structural strength, it is usually to form a complex assembly structure by injecting resin materials inside a fiber composite material with a simple structure to form a composite material. However, the resin material has low strength and cannot meet the reliability requirements of wearable products, and conventional hot pressing methods are difficult to form fiber composite materials with complex structures. Summary of the Invention

[0003] An object of the present invention is to provide a new technical solution for a preparation method of a combination of metal materials and non-metal materials.

[0004] According to a first aspect of the present invention, there is provided a preparation method of a combination of metal materials and non-metal materials. The preparation method of the combination of metal materials and non-metal materials includes: Providing a metal substrate, and forming a nano-scale pore structure on the surface of the metal substrate, the pore diameter of the nano-scale pore structure being 100 nm - 1000 nm; Using 3D printing to form a molten thermoplastic fiber composite material on the surface of the metal substrate, a part of the thermoplastic fiber composite material being filled in the nano-scale pore structure, wherein the thermoplastic fiber composite material includes a thermoplastic material and continuous fibers, and the mass content of the continuous fibers in the thermoplastic fiber composite material being 40% - 80%.

[0005] Optionally, the step of providing a metal substrate and forming a nano-scale pore structure on the surface of the metal substrate includes forming a nano-scale pore structure on the surface of the metal substrate by using pulsed laser or chemical etching.

[0006] Optionally, using pulsed laser to form a nano-scale pore structure on the surface of the metal substrate, wherein the laser frequency is 100 KHz - 10 MHz, and the scanning speed is 100 mm / s - 1500 mm / s.

[0007] Optionally, when performing 3D printing, the temperature of the metal substrate is 30°C - 100°C.

[0008] Optionally, the step of using 3D printing to form a thermoplastic fiber composite material on the surface of the metal substrate includes: Feeding a thermoplastic prepreg, or a fiber bundle of a thermoplastic material and continuous fibers into the nozzle of 3D printing at the same time and spraying and forming on the surface of the metal substrate.

[0009] Optionally, the thermoplastic material includes at least one of ABS, PC, ABS, PA, PPA, PBT, COP, PPE, LCP, PEI, PEEK, and TPV.

[0010] Optionally, the continuous fibers include at least one of carbon fibers, aramid fibers, glass fibers, and Kevlar fibers.

[0011] Optionally, when performing 3D printing, a printing temperature of 50°C - 300°C and a printing speed of 0.5 mm / s - 5 mm / s are adopted to form the thermoplastic fiber composite material on the surface of the metal substrate.

[0012] Optionally, the thickness of the thermoplastic fiber composite material is 0.4 mm - 2.5 mm.

[0013] According to a second aspect of the present invention, a combined member of a metal material and a non-metal material is provided. The combined member is prepared according to the preparation method of the combined member of the metal material and the non-metal material described in the present invention.

[0014] In an embodiment of the present invention, 3D printing is used to form a thermoplastic fiber composite material on the surface of a metal substrate to obtain a combined member of a metal material and a non-metal material. By forming a nano-porous structure with a pore diameter of 100 nm - 1000 nm on the surface of the metal substrate, the molten thermoplastic fiber composite material can completely fill into the nano-porous structure, so that the bonding force between the thermoplastic fiber composite material and the metal substrate is large. By setting the mass content of the continuous fibers in the thermoplastic fiber composite material to 40% - 80%, both the high structural strength of the thermoplastic fiber composite material can be ensured, and the bonding force between the fiber bundles of the continuous fibers and / or between the continuous fibers and the metal substrate can be high, avoiding the detachment of the thermoplastic fiber composite material or the appearance of dry yarn on the surface of the thermoplastic fiber composite material. The processing efficiency of this preparation method is high, complex-structured thermoplastic composite materials can be prepared, the bonding force between the metal substrate and the thermoplastic fiber composite material of the prepared combined member is large, the structural strength of the thermoplastic fiber composite material is high, and the appearance is good.

[0015] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. Description of the Drawings

[0016] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0017] Figure 1It is a flowchart of a method for preparing a bonded part of a metal material and a non-metal material according to an embodiment of the present invention. Detailed implementation manners

[0018] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0019] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation to the present invention and its application or use.

[0020] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0021] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0022] It should be noted that: similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0023] The method for preparing a bonded part of a metal material and a non-metal material according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

[0024] According to an embodiment of the present invention, a method for bonding a metal material and a non-metal material is provided. As Figure 1 shown, the preparation method includes: Providing a metal substrate, and forming a nano-scale pore structure on the surface of the metal substrate, wherein the pore diameter of the nano-scale pore structure is 100 nm - 1000 nm; Using 3D printing to form a molten thermoplastic fiber composite material on the surface of the metal substrate, and a part of the thermoplastic fiber composite material is filled in the nano-scale pore structure. Among them, the thermoplastic fiber composite material includes a thermoplastic material and continuous fibers, and the mass content of the continuous fibers in the thermoplastic fiber composite material is 40% - 80%.

[0025] Specifically, the materials of the metal substrate include aluminum alloy, stainless steel, carbon steel, copper alloy, titanium alloy, titanium, aluminum, copper, etc. The metal substrate is processed into a set structure by CNC machining. The metal substrate is roughened. The purpose of the roughening treatment is to form a nano-scale pore structure on the surface of the metal substrate to increase the specific surface area of the metal substrate, thereby improving the bonding strength between the thermoplastic fiber composite material and the metal substrate. The nano-scale pore structure is a blind hole. After the roughening treatment, the pore diameter of the nano-scale pore structure is 100nm - 1000nm.

[0026] It should be noted that the nano-scale pore structure is a plurality of blind holes formed on the surface of the metal substrate. During 3D printing, a part of the thermoplastic material of the thermoplastic fiber composite material can be filled in the blind holes and can be fixed in the blind holes after the thermoplastic material is cured. This connection structure can significantly increase the bonding strength between the thermoplastic fiber composite material and the metal substrate. If the pore diameter of the nano-scale pore structure is too small, the bonding strength between the thermoplastic material and the metal substrate is small; on the contrary, if the pore diameter is too large, the molten thermoplastic material cannot be completely filled into the nano-scale pore structure. When the pore diameter of the nano-scale pore structure is 100nm - 1000nm, the molten thermoplastic material can be completely filled into the nano-scale pore structure, so that the bonding strength between the thermoplastic fiber composite material and the metal substrate is large.

[0027] Optionally, the pore diameter of the nano-scale pore structure is 100nm, 150nm, 200nm, 250nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm, 1000nm, etc., and those skilled in the art can select according to actual needs.

[0028] 3D printing, also known as additive manufacturing, is a preparation process for manufacturing three-dimensional entities based on digital model files (for example, CAD models) by stacking layer by layer and laying printing materials layer by layer. In the embodiments of the present invention, the thermoplastic fiber composite material is used as the printing material. The thermoplastic fiber composite material includes thermoplastic fiber prepregs, or includes thermoplastic materials and continuous fibers. When using thermoplastic fiber prepregs, the thermoplastic fiber prepregs can be directly 3D printed through the nozzle of a 3D printing device. When using thermoplastic materials and continuous fibers, the thermoplastic materials and the fiber bundles of continuous fibers are simultaneously fed into the interior of the printing nozzle, and the printing nozzle heats the thermoplastic materials into a molten state under the action of a heater. The thermoplastic materials and the fiber bundles of continuous fibers are continuously fed into the printing nozzle, and the fiber bundles in the thermoplastic fiber composite material are extruded from the printing nozzle under the extrusion action of the molten thermoplastic materials and are printed and formed on the surface of the metal substrate.

[0029] In this embodiment, when 3D printing is performed, the thermoplastic material is heated in the print head and melted, and adheres to the continuous fibers. The two are output in the form of lines from the print nozzle of the printing device and adhere to the surface of the metal substrate.

[0030] It should be noted that when the content of continuous fibers in the thermoplastic fiber composite material is too low, the structural strength of the formed thermoplastic fiber composite material is low and cannot meet the use requirements; on the contrary, when the content of continuous fibers is too high, it is easy to cause the content of thermoplastic materials between the fiber bundles of continuous fibers and / or between the continuous fibers and the metal substrate to be too little, and the bonding force is insufficient, which can easily cause the thermoplastic fiber composite material to fall off, or dry yarn to appear on the surface of the metal material and non-metallic material combination, resulting in poor product surface. When the mass content of continuous fibers in the thermoplastic fiber composite material is 40%-80%, it can not only ensure the high structural strength of the thermoplastic fiber composite material, but also make the bonding force between the fiber bundles of continuous fibers and / or between continuous fibers and the metal substrate high, avoiding the falling off of the thermoplastic fiber composite material or the appearance of dry yarn on the surface of the metal material and non-metallic material combination.

[0031] Optionally, the mass content of the continuous fibers in the thermoplastic fiber composite material is 40%, 50%, 60%, 70%, 80%, etc., and those skilled in the art can make the selection according to actual needs.

[0032] In an embodiment of the present invention, a thermoplastic fiber composite material is formed on the surface of a metal substrate by 3D printing to obtain a metal material and a non-metallic material combination. By forming a nanoscale pore structure with a pore size of 100nm-1000nm on the surface of the metal substrate, the thermoplastic fiber composite material in a molten state can be completely filled into the nanoscale pore structure, so that the bonding force between the thermoplastic fiber composite material and the metal substrate is large. By setting the mass content of the continuous fiber in the thermoplastic fiber composite material to 40%-80%, it can not only ensure that the structural strength of the thermoplastic fiber composite material is high, but also make the bonding force between the fiber bundles of the continuous fibers and / or between the continuous fibers and the metal substrate high, avoiding the shedding of the thermoplastic fiber composite material or the appearance of dry yarn on the surface of the thermoplastic fiber composite material. The preparation method has high processing efficiency, and can prepare thermoplastic fiber composite materials with complex structures. The metal substrate of the prepared combination has a large bonding force with the thermoplastic fiber composite material, and the thermoplastic fiber composite material has a high structural strength and a good appearance.

[0033] In one embodiment of the present invention, in a 3D printing device, a print head is used to melt a thermoplastic resin. The printing temperature refers to the temperature of the print head of the printing device. The temperature of the print head is set to 50°C - 300°C. At this temperature, the thermoplastic material can be effectively melted to obtain fluidity. It should be noted that when the printing temperature is too low, the thermoplastic material cannot be effectively melted, resulting in poor fluidity; on the contrary, when the printing temperature is too high, the thermoplastic material is prone to carbonization and aging, resulting in the denaturation of the thermoplastic material. When the printing temperature is 50°C - 300°C, it can not only ensure the effective melting of the thermoplastic material but also avoid the carbonization and aging of the thermoplastic material.

[0034] Optionally, the printing temperature is 50°C, 100°C, 150°C, 200°C, 250°C, 300°C, etc., and those skilled in the art can select according to actual needs.

[0035] In an embodiment of the present invention, 3D printing is used to form a thermoplastic fiber composite material on the surface of a metal substrate to obtain a combined part of a metal material and a non-metal material. By forming a nano-scale pore structure with a pore diameter of 100nm - 1000nm on the surface of the metal substrate, the molten thermoplastic fiber composite material can completely fill into the nano-scale pore structure, so that the bonding force between the thermoplastic fiber composite material and the metal substrate is large. By setting the mass content of the continuous fibers in the thermoplastic fiber composite material to 40% - 80%, it can not only ensure the high structural strength of the thermoplastic fiber composite material but also make the bonding force between the fiber bundles of the continuous fibers and / or between the continuous fibers and the metal substrate high, avoiding the shedding of the thermoplastic fiber composite material or the appearance of dry yarn on the surface of the combined part of the metal material and the non-metal material.

[0036] In addition, by setting the printing temperature to 50°C - 300°C, it can not only ensure the effective melting of the thermoplastic fiber composite material but also avoid the carbonization and aging of the thermoplastic fiber composite material, so that part of the thermoplastic fiber composite material can effectively fill into the nano-scale pore structure. The processing efficiency of this preparation method is high, continuous fibers with complex structures can be prepared, the bonding force between the metal substrate and the thermoplastic fiber composite material of the prepared combined part of the metal material and the non-metal material is large, the structural strength of the thermoplastic fiber composite material is high, and the appearance is good.

[0037] In a specific embodiment of the present invention, providing the metal substrate and forming a nano-scale pore structure on the surface of the metal substrate includes forming a nano-scale pore structure on the surface of the metal substrate by using pulsed laser or chemical etching.

[0038] In specific implementation, the metal substrate is roughened by the above processing technology to form a nano-porous structure. Among them, pulsed laser means removing part of the material on the surface of the metal substrate by using the high energy density of the pulsed laser beam to form a nano-porous structure. Chemical corrosion means corroding the metal substrate with chemical agents to form a nano-porous structure. The above processes can all form a nano-porous structure on the surface of the metal substrate, and those skilled in the art can choose according to actual needs.

[0039] In a specific embodiment of the present invention, a nano-porous structure is formed on the surface of the metal substrate by using a pulsed laser, wherein the laser frequency is 100KHz - 10MHz, and the scanning speed is 100 mm / s - 1500mm / s.

[0040] In this embodiment, a nano-porous structure is formed on the surface of the metal substrate by using a pulsed laser. By controlling the laser frequency and scanning speed, the pore diameter and formation speed of the nano-porous structure can be controlled. When the laser frequency is too low and the scanning speed is too high, the pore diameter of the nano-porous structure is too small; on the contrary, when the laser frequency is too high and the scanning speed is too low, the pore diameter of the nano-porous structure is too large. When the laser frequency is 100KHz - 10MHz and the scanning speed is 100mm / s - 1500mm / s, the pore diameter of the nano-porous structure formed on the surface of the metal substrate is 100nm - 1000nm, so as to ensure a large bonding force between the metal substrate and the thermoplastic fiber composite material.

[0041] Optionally, the laser frequency is 100KHz, 150KHz, 200KHz, 250KHz, 300KHz, 400KHZ, 600KHZ, 800KHZ, 1MHZ, 5MHZ, 10MHZ, etc., and the scanning speed is 100mm / s, 200mm / s, 300mm / s, 400mm / s, 500mm / s, 600mm / s, 800mm / s, 1000mm / s, 1100mm / s, 1300mm / s, 1500mm / s, etc., and those skilled in the art can choose according to actual needs.

[0042] In a specific embodiment of the present invention, when performing 3D printing, the temperature of the metal substrate is 30°C - 100°C.

[0043] Specifically, before 3D printing, the metal substrate is placed in the printing device, and the metal substrate is preheated by the heating mechanism in the 3D printing device. For example, it is heated to 30°C - 100°C; then, 3D printing is carried out. It should be noted that when the temperature of the metal substrate is too high, the curing speed of the thermoplastic material is too slow, resulting in an ineffective large bonding force between the thermoplastic fiber composite material and the metal substrate; while when the temperature of the metal substrate is too low, the curing speed of the thermoplastic material is too fast, which may cause the thermoplastic fiber composite material to not completely fill the nano-scale pore structure, resulting in a low bonding force between the thermoplastic fiber composite material and the metal substrate. When the temperature of the metal substrate is 30°C - 100°C, the curing speed of the thermoplastic material is moderate, and the thermoplastic fiber composite material can completely fill the nano-scale pore structure, making the bonding force between the thermoplastic fiber composite material and the metal substrate large.

[0044] Optionally, the temperature of the metal substrate is 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, etc., and those skilled in the art can select according to actual needs.

[0045] In a specific embodiment of the present invention, the thermoplastic fiber composite material includes a thermoplastic fiber prepreg, and the thermoplastic fiber prepreg includes the thermoplastic material and the continuous fiber, and the continuous fiber is pre-impregnated in the thermoplastic material.

[0046] In this embodiment, the thermoplastic fiber prepreg refers to a semi-finished material formed by pre-impregnating continuous fibers into a thermoplastic material, and a product with a set structure can be made through subsequent curing processing. The thermoplastic fiber prepreg is an intermediate material for forming the composite material. During 3D printing, the thermoplastic fiber prepreg is added into the printing nozzle, heated by the heating mechanism to make the thermoplastic material reach a molten state, and then the thermoplastic fiber prepreg is output in a line shape from the printing nozzle and adheres to the surface of the metal substrate.

[0047] In a specific embodiment of the present invention, the thermoplastic material includes at least one of ABS, PC, ABS, PA, PPA, PBT, COP, PPE, LCP, PEI, PEEK, TPV.

[0048] Specifically, during 3D printing, the thermoplastic material can be any one or a mixture of multiple of ABS, PC, ABS, PC, PA, PPA, PBT, COP, PPE, LCP, PEI, PEEK, TPV. The thermoplastic material is added into the printing nozzle of the 3D printing device and heated by the heating mechanism to be melted. The above materials can all be melted in the 3D printing device and adhere to the continuous fibers.

[0049] In a specific embodiment, the thermoplastic fiber composite material uses thermoplastic vulcanizate (TPV) and continuous fibers.

[0050] In a specific embodiment of the present invention, the continuous fibers include at least one of carbon fibers, aramid fibers, glass fibers, and Kevlar fibers.

[0051] In this embodiment, the continuous fibers can be selected from any one or a mixture of carbon fibers, aramid fibers, glass fibers, and Kevlar fibers. The above-mentioned continuous fibers can all be bonded to the molten thermoplastic material.

[0052] In a specific embodiment of the present invention, when performing 3D printing, the diameter of the printing nozzle is 0.2 mm - 2 mm, and the printing speed is 0.5 mm / s - 5 mm / s.

[0053] During specific implementation, by controlling the diameter of the printing nozzle and the printing speed, the bonding force between the thermoplastic fiber composite material and the metal substrate and the structural strength of the thermoplastic fiber composite material are further improved.

[0054] The diameter of the printing nozzle determines the discharge amount of the thermoplastic fiber composite material. When the diameter of the printing nozzle is too large, the discharge amount of the thermoplastic fiber composite material is large, the printed line is thick, and voids are likely to form between adjacent lines, resulting in a small bonding force between the thermoplastic fiber composite material and the metal substrate; conversely, when the diameter of the printing nozzle is too small, the discharge amount of the thermoplastic fiber composite material is small, the printed line is thin, and the phenomenon of printing nozzle clogging is likely to occur. When the diameter of the printing nozzle is 0.2 mm - 2 mm, it can effectively avoid the formation of voids between adjacent lines and reduce the phenomenon of printing nozzle clogging.

[0055] Optionally, the diameter of the printing nozzle is 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, etc., and those skilled in the art can select according to actual needs.

[0056] The printing speed refers to the traveling speed of the printing nozzle. When the printing speed is too fast, it is easy to cause poor bonding between adjacent lines, and the molten thermoplastic material does not completely fill the nano-scale pore structure, resulting in a small bonding force between the thermoplastic fiber composite and the metal substrate. On the contrary, when the printing speed is too slow, the cooling time of the line is too long, resulting in too large internal shrinkage stress in the thermoplastic fiber composite, which is easy to cause warping and deformation of the printing material. In addition, whether the printing speed is too fast or too slow will cause a large roughness of the thermoplastic fiber composite and continuous fiber fracture, affecting the appearance. When the printing speed is 0.5 mm / s - 5 mm / s, it can not only make the bonding force between adjacent lines strong, and the molten thermoplastic material completely fill the nano-scale pore structure, but also avoid warping and deformation of the printing material, with a small roughness of the thermoplastic fiber composite and avoid continuous fiber fracture.

[0057] Optionally, the printing speed is 0.5 mm / s, 1 mm / s, 1.5 mm / s, 2 mm / s, 2.5 mm / s, 3 mm / s, 3.5 mm / s, 4 mm / s, 4.5 mm / s, 5 mm / s, etc., and those skilled in the art can select according to actual needs.

[0058] In a specific embodiment of the present invention, the thickness of the thermoplastic fiber composite is 0.4 mm - 2.5 mm.

[0059] It should be noted that the thickness of the thermoplastic fiber composite has a great influence on the structural strength and roughness. When the thickness of the thermoplastic fiber composite is too small, the structural strength of the thermoplastic fiber composite is low; on the contrary, when the thickness of the thermoplastic fiber composite is too large, the processing speed is slow. And whether the thickness of the thermoplastic fiber composite is too large or too small will cause a large roughness of the thermoplastic fiber composite. When the thickness of the thermoplastic fiber composite is 0.4 mm - 2.5 mm, it can not only ensure high structural strength and small roughness of the thermoplastic fiber composite, but also take into account a relatively fast processing speed.

[0060] Optionally, the thickness of the thermoplastic fiber composite is 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc., and those skilled in the art can select according to actual needs.

[0061] According to another embodiment of the present invention, a metal material and non-metal material combination is provided. The metal material and non-metal material combination is prepared according to the preparation method of the metal material and non-metal material combination described in the present invention.

[0062] The metal material and non-metal material combination has the characteristics of high structural strength, low overall density, and large bonding force between different composite layers.

[0063] Example 1 In this example, the metal substrate is an aluminum alloy substrate. The thermoplastic fiber composite material includes PA and continuous carbon fibers. Among them, in the thermoplastic fiber composite material, the mass content of the continuous carbon fibers is 50%.

[0064] Laser etching is used to form a nano-scale pore structure on the surface of the aluminum alloy substrate. The laser frequency is 1MHZ, and the scanning speed is 1000mm / s. The pore diameter of the formed nano-scale pore structure is 100nm - 300nm.

[0065] The aluminum alloy substrate is placed into a 3D printing device. The preheating temperature of the aluminum alloy substrate is 50°C. PA and continuous carbon fibers are added into the printing nozzle and melted. The diameter of the printing nozzle is 0.25mm, the printing speed is 0.5mm / s, and the printing temperature is 200°C. The thickness of the 3D printed thermoplastic fiber composite material is 0.4mm.

[0066] After the thermoplastic fiber composite material is cured, the bonding strength between the aluminum alloy substrate and the thermoplastic fiber composite material is measured. Specifically, the area of the bonding surface between the aluminum alloy substrate and the thermoplastic fiber composite material is 0.5cm 2 (20mm * 25mm). The specimen is symmetrically clamped on a universal testing machine. The distance from the clamping position to the nearest bonding end is 25mm. The testing machine performs tensile testing at a constant testing speed, such as 5mm / min, and records the maximum load at the shear failure of the specimen, which is the bonding strength.

[0067] After measurement, the bonding strength is 30MPa.

[0068] Example 2 In this example, the metal substrate is an aluminum alloy substrate. The thermoplastic fiber composite material includes PA and continuous carbon fibers. Among them, in the thermoplastic fiber composite material, the mass content of the continuous carbon fibers is 50%.

[0069] Laser etching is used to form a nano-scale pore structure on the surface of the aluminum alloy substrate. The laser frequency is 800KHZ, and the scanning speed is 1200mm / s. The pore diameter of the formed nano-scale pore structure is 100nm - 300nm.

[0070] The aluminum alloy substrate is placed into a 3D printing device. The preheating temperature of the aluminum alloy substrate is 50°C. PA and continuous carbon fibers are added into the printing nozzle and melted. The diameter of the printing nozzle is 0.25mm, the printing speed is 0.5mm / s, and the printing temperature is 200°C. The thickness of the 3D printed thermoplastic fiber composite material is 0.4mm.

[0071] After the thermoplastic fiber composite material is cured, the bonding strength between the aluminum alloy substrate and the thermoplastic fiber composite material is measured. The measurement method is as described in Example 1.

[0072] After measurement, the bonding strength is 30 MPa.

[0073] Comparative Example 1 In Comparative Example 1, the metal substrate is an aluminum alloy substrate. The thermoplastic fiber composite material includes PA and continuous carbon fibers. Among them, in the thermoplastic fiber composite material, the mass content of continuous carbon fibers is 50%.

[0074] Laser etching is used to form a nano-scale pore structure on the surface of the aluminum alloy substrate. The laser frequency is 500 KHz and the scanning speed is 500 mm / s. An obvious groove structure is formed on the surface of the aluminum alloy substrate.

[0075] The aluminum alloy substrate is placed in a 3D printing device. The preheating temperature of the aluminum alloy substrate is 50 °C. PA and continuous carbon fibers are added to the printing nozzle and melted. The diameter of the printing nozzle is 0.25 mm, the printing speed is 0.1 mm / s, and the printing temperature is 200 °C. The thickness of the 3D printed thermoplastic fiber composite material is 0.3 mm.

[0076] After the thermoplastic fiber composite material is cured, the bonding strength between the aluminum alloy substrate and the thermoplastic fiber composite material is measured. The measurement method is as described in Example 1.

[0077] After measurement, the bonding strength is 3 MPa.

[0078] Comparative Example 2 In Comparative Example 2, the metal substrate is an aluminum alloy substrate. The thermoplastic fiber composite material includes PA and continuous carbon fibers. Among them, in the thermoplastic fiber composite material, the mass content of continuous carbon fibers is 50%.

[0079] Laser etching is used to form a nano-scale pore structure on the surface of the aluminum alloy substrate. The laser frequency is 10 MHz and the scanning speed is 1500 mm / s. There is no obvious pore structure on the surface of the aluminum alloy substrate.

[0080] The aluminum alloy substrate is placed in a 3D printing device. The preheating temperature of the aluminum alloy substrate is 50 °C. PA and continuous carbon fibers are added to the printing nozzle and melted. The diameter of the printing nozzle is 1 mm, the printing speed is 5.5 mm / s, and the printing temperature is 200 °C. The thickness of the 3D printed thermoplastic fiber composite material is 1.1 mm.

[0081] After the thermoplastic fiber composite material is cured, the bonding strength between the aluminum alloy substrate and the thermoplastic fiber composite material is measured. The measurement method is as described in Example 1.

[0082] After measurement, the bonding strength is 4 MPa.

[0083] In summary, in Embodiment 1 and Embodiment 2, the bonded part of the metal material and the non-metal material is prepared by the preparation method for bonding the metal material and the non-metal material according to the embodiments of the present invention. During the preparation, by forming a nano-porous structure with a pore diameter of 100 nm - 1000 nm on the surface of the aluminum alloy substrate, the molten thermoplastic material can completely fill into the nano-porous structure, so that the bonding strength between the thermoplastic fiber composite material and the aluminum alloy substrate is large. By setting the diameter of the printing nozzle of the 3D printing device to 0.25 mm, it can effectively avoid forming voids between adjacent lines and reduce the phenomenon of printing nozzle blockage. By setting the printing speed of 3D printing to 0.5 mm / s, it can not only make the bonding strength between adjacent lines strong and the molten thermoplastic fiber composite material completely fill the nano-porous structure, but also avoid warping and deformation of the printing material, the roughness of the thermoplastic fiber composite material is small, and continuous fiber breakage is avoided. By setting the thickness of the thermoplastic fiber composite material to 0.4 mm, it can not only ensure high structural strength and small roughness of the thermoplastic fiber composite material, but also take into account the accelerated processing speed. The bonded part of the metal material and the non-metal material has a large bonding strength between the aluminum alloy substrate and the thermoplastic fiber composite material, and the thermoplastic fiber composite material has high structural strength. In addition, when the preheating temperature of the aluminum alloy substrate is 50 °C, the curing speed of the thermoplastic material is moderate, and the thermoplastic fiber composite material can completely fill the nano-porous structure, so that the bonding strength between the thermoplastic fiber composite material and the aluminum alloy substrate is large. The printing temperature is 200 °C, which can not only ensure effective melting of the thermoplastic material, but also avoid carbonization and aging of the thermoplastic material. Finally, in the bonded parts of the metal material and the non-metal material in Embodiment 1 and Embodiment 2, the bonding strength between the aluminum alloy substrate and the thermoplastic fiber composite material is large, both reaching 30 MPa, meeting the production requirements.

[0084] However, in the preparation methods of Comparative Examples 1 and 2, due to the mismatch between the laser frequency and the scanning speed of laser etching, a nano-porous structure with a pore diameter of 100 nm - 1000 nm cannot be formed on the surface of the aluminum alloy substrate, and during 3D printing, the printing speed and the thickness of the formed thermoplastic fiber composite material are also inappropriate, resulting in a small bonding strength between the aluminum alloy substrate and the thermoplastic fiber composite material.

[0085] The differences between the above embodiments are mainly described. As long as the different optimized features between the embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0086] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A preparation method for a combined component of a metal material and a non-metal material, characterized in that, Comprising: Providing a metal substrate, and forming a nano-scale pore structure on the surface of the metal substrate, wherein the pore diameter of the nano-scale pore structure is 100 nm - 1000 nm; Using 3D printing to form a molten thermoplastic fiber composite material on the surface of the metal substrate, and partially filling the nano-scale pore structure with the thermoplastic fiber composite material, wherein the thermoplastic fiber composite material comprises a thermoplastic material and continuous fibers, and the mass content of the continuous fibers in the thermoplastic fiber composite material is 40% - 80%.

2. The preparation method of the combination of metal material and non-metal material according to claim 1, characterized in that The step of providing a metal substrate and forming a nano-scale pore structure on the surface of the metal substrate includes forming a nano-scale pore structure on the surface of the metal substrate by using pulsed laser or chemical etching.

3. The preparation method of the combination of metal material and non-metal material according to claim 2, characterized in that, Forming a nano-scale pore structure on the surface of the metal substrate by using pulsed laser, wherein the laser frequency is 100 KHz - 10 MHz, and the scanning speed is 100 mm / s - 1500 mm / s.

4. The preparation method of the metal material and non-metal material combination according to claim 1, characterized in that When performing 3D printing, the temperature of the metal substrate is 30°C - 100°C.

5. The preparation method of the combination of metal material and non-metal material according to claim 1, characterized in that, The step of using 3D printing to form a thermoplastic fiber composite material on the surface of the metal substrate includes: Feeding a thermoplastic fiber prepreg, or a fiber bundle of a thermoplastic material and continuous fibers into the nozzle of 3D printing simultaneously and spraying and forming on the surface of the metal substrate.

6. The preparation method of the metal material and non-metal material combination according to claim 1 or 5, characterized in that The thermoplastic material includes at least one of ABS, PC, ABS, PA, PPA, PBT, COP, PPE, LCP, PEI, PEEK, TPV.

7. The preparation method of the combination of metal material and non-metal material according to claim 1 or 5, characterized in that The continuous fibers include at least one of carbon fibers, aramid fibers, glass fibers, Kevlar fibers.

8. The preparation method of the metal material and non-metal material combination according to claim 5, characterized in that When performing 3D printing, using a printing temperature of 50°C - 300°C and a printing speed of 0.5 mm / s - 5 mm / s to form a thermoplastic fiber composite material on the surface of the metal substrate.

9. The preparation method of the combined part of the metal material and the non-metal material according to claim 1, characterized in that, The thickness of the thermoplastic fiber composite material is 0.4 mm - 2.5 mm.

10. A combined part of a metal material and a non-metal material, characterized in that, Prepared by the preparation method of the metal material and non-metal material combination according to any one of claims 1 - 9.

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