Copper alloy and carbon fiber composite material, and preparation method and application thereof

Abstract

This invention relates to the field of explosion-proof materials, and discloses a copper alloy and carbon fiber composite material, its preparation method, and its application. The copper alloy comprises the following components: 6-11 wt% aluminum; 3-5.5 wt% nickel; 2.8-5 wt% iron; 1-2 wt% manganese; 0.05-0.2 wt% tin; 0.02-0.05 wt% rare earth metals; and 76.25-87.13 wt% copper. The copper alloy provided by this invention uses specific amounts of aluminum, nickel, iron, manganese, tin, and rare earth metals in combination with copper, resulting in excellent mechanical and explosion-proof properties. The specific mass ratio of nickel and iron, combined with other elements, further enhances the mechanical properties of the copper alloy. The copper alloy can be obtained by casting molten metal, achieving excellent mechanical properties without forging, effectively avoiding plastic deformation caused by the high temperature and pressure during forging.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof materials, specifically to a copper alloy and carbon fiber composite material, its preparation method, and its application. Background Technology

[0002] In high-risk, flammable, and explosive industrial sectors such as petroleum, petrochemicals, offshore oil, and chemicals, safe production is of paramount importance. To ensure safe operation in these challenging environments, the application of explosion-proof tools is indispensable. Currently, beryllium bronze and aluminum bronze are widely used as explosion-proof materials in the market. Due to their unique physical and chemical properties, these two materials do not generate sparks upon impact or friction, effectively preventing explosions caused by sparks and significantly improving operational safety.

[0003] However, while tools made from beryllium bronze and aluminum bronze offer significant safety advantages, they also have some inherent drawbacks. First, compared to traditional steel, these two materials have a higher density, resulting in heavier tools that can increase the physical burden on operators and reduce work efficiency over extended periods. Second, although alloying and other methods can improve the strength of explosion-proof materials to some extent, their strength remains lower than that of steel, limiting their application in high-intensity work environments.

[0004] To overcome the aforementioned deficiencies and improve the mechanical properties of explosion-proof tools, forging is a commonly used method in existing technologies to process explosion-proof materials. Forging, through plastic deformation under high temperature and pressure, can refine the grain structure of the material, increasing its density and strength. Simultaneously, by increasing the basic dimensions of the explosion-proof tool, the insufficient strength of the material can be compensated for to some extent, allowing the tool to maintain its structural integrity and stability even under greater loads.

[0005] However, while this method improves the mechanical properties of explosion-proof tools to some extent, it also brings new problems. Due to the increased density and size, the weight of explosion-proof tools also increases significantly, which exacerbates the physical burden on operators and contradicts the original intention of improving work efficiency.

[0006] Therefore, how to further reduce the weight and improve the mechanical properties of explosion-proof materials while maintaining their explosion-proof performance has become a pressing technical challenge in the field of explosion-proof material research and development. Summary of the Invention

[0007] The purpose of this invention is to overcome the problem in the prior art that it is difficult to simultaneously achieve the explosion-proof performance, lightweight and mechanical properties of explosion-proof tools, and to provide a copper alloy and carbon fiber composite material, its preparation method and application, wherein the copper alloy can achieve basic explosion-proof function while having excellent mechanical properties.

[0008] To achieve the above objectives, a first aspect of the present invention provides a copper alloy, wherein the copper alloy comprises the following components: 6-11 wt% aluminum; 3-5.5 wt% nickel; 2.8-5 wt% iron; 1-2 wt% manganese; 0.05-0.2wt% tin; 0.02-0.05 wt% rare earth metals; 76.25-87.13 wt% copper.

[0009] A second aspect of the present invention provides a method for preparing a copper alloy, the method comprising the following steps: The copper, aluminum, nickel, iron, manganese, tin and rare earth metal sources are smelted to obtain a molten metal, and the molten metal is cast to obtain a copper alloy.

[0010] A third aspect of the present invention provides a composite material, wherein the composite material comprises a copper alloy and a carbon-containing material coated on the surface of the copper alloy; Wherein, the copper alloy is the copper alloy described in the first aspect, or the copper alloy prepared by the method described in the second aspect; The carbon-containing material comprises 10-30 wt% carbon fiber and 70-90 wt% resin.

[0011] A fourth aspect of the present invention provides a method for preparing the composite material described in the third aspect, the method comprising the following steps: Under coating conditions, carbon-containing materials are coated onto the surface of copper alloys to obtain composite materials.

[0012] The fifth aspect of this invention provides the application of the copper alloy described in the first aspect, the copper alloy prepared by the method described in the second aspect, the composite material described in the third aspect, or the composite material prepared by the method described in the fourth aspect in the field of explosion-proof materials.

[0013] Through the above technical solutions, the copper alloy and carbon fiber composite materials, their preparation methods, and applications provided by this invention achieve the following beneficial effects: The copper alloy provided by this invention combines copper with specific amounts of aluminum, nickel, iron, manganese, tin and rare earth metals, giving the copper alloy excellent mechanical properties and explosion-proof properties.

[0014] Furthermore, in this invention, nickel and iron are used in a specific mass ratio, and together with other elements, the mechanical properties of the copper alloy are further improved.

[0015] Furthermore, in this invention, the copper alloy can be obtained by pouring molten metal, and can achieve excellent mechanical properties without forging, effectively avoiding plastic deformation caused by high temperature and high pressure during the forging process. Detailed Implementation

[0016] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0017] A first aspect of the present invention provides a copper alloy, wherein the copper alloy comprises the following components: 6-11 wt% aluminum; 3-5.5 wt% nickel; 2.8-5 wt% iron; 1-2 wt% manganese; 0.05-0.2wt% tin; 0.02-0.05 wt% rare earth metals; 76.25-87.13 wt% copper.

[0018] In this invention, the inventors discovered that by combining copper with specific amounts of aluminum, nickel, iron, manganese, tin, and rare earth metals, the copper alloy exhibits excellent mechanical and explosion-proof properties.

[0019] In this invention, specific amounts of aluminum, nickel, and manganese are used in combination to further improve the mechanical properties of the copper alloy. Furthermore, the use of a specific amount of tin, combined with other elements, not only effectively increases the hardness of the copper alloy but also better prevents a decrease in its toughness.

[0020] In specific embodiments of the present invention, the aluminum content in the copper alloy can be a specific value or a range between the two, such as 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, or 11 wt%; the nickel content can be a specific value or a range between the two, such as 3, 3.5, 4, 4.5, 5, or 5.5 wt%; the iron content can be a specific value or a range between the two, such as 2.8, 3, 3.5, 4, 4.5, or 5 wt%; the manganese content can be a specific value or a range between the two, such as 1, 1.5, or 2 wt%; the tin content can be a specific value or a range between the two, such as 0.05, 0.1, 0.15, or 0.2 wt%; and the copper content can be a specific value or a range between the two, such as 76.25, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, or 87.13 wt%.

[0021] Furthermore, the copper alloy comprises the following components: 7-10.5 wt% aluminum; 3.5-5 wt% nickel; 3-4.5 wt% iron; 1.2-1.8 wt% manganese; 0.08-0.15wt% tin; 0.035-0.045 wt% rare earth metals; 78-85.18 wt% copper.

[0022] In this invention, the content of each component in the copper alloy is determined by a full-spectrum direct-reading spectrometer.

[0023] In this invention, the rare earth metal is a conventional choice in the art, and preferably, the rare earth metal is lanthanum and / or cerium.

[0024] According to a particularly preferred embodiment of the present invention, the mass ratio of nickel to iron in the copper alloy is 0.9-1.1:1, for example, it can be a specific ratio or a range between the two, such as 0.9:1, 0.92:1, 0.94:1, 0.96:1, 0.98:1, 1:1, 1.02:1, 1.04:1, 1.06:1, 1.08:1, 1.1:1, etc. Adopting a mass ratio within the above range is beneficial for better improving the mechanical properties of the copper alloy.

[0025] According to a particularly preferred embodiment of the present invention, the hardness HRC of the copper alloy is 20-30.

[0026] According to a particularly preferred embodiment of the present invention, the density of the copper alloy is 7.58-7.60 g / cm³. 3 .

[0027] According to a particularly preferred embodiment of the present invention, the torque of the copper alloy is 236-375 N·m.

[0028] A second aspect of the present invention provides a method for preparing the copper alloy described in the first aspect of the present invention, the method comprising the following steps: The copper, aluminum, nickel, iron, manganese, tin and rare earth metal sources are smelted to obtain a molten metal, and the molten metal is cast to obtain a copper alloy.

[0029] In this invention, the copper source, aluminum source, nickel source, iron source, manganese source, tin source, and rare earth metal are conventional choices in the field. For example, each can be an elemental metal, a metal salt, or a metal oxide, as long as the composition of the final copper alloy meets the requirements of this invention.

[0030] According to the most preferred embodiment of the present invention, the copper source, aluminum source, nickel source, iron source, manganese source, tin source and rare earth metal are each independently a metallic element, which is beneficial to improving the mechanical properties of copper alloys.

[0031] In this invention, there are no particular limitations on the amount of copper source, aluminum source, nickel source, iron source, manganese source, tin source and rare earth metal used, as long as the content of each component in the final copper alloy meets the requirements of this invention.

[0032] The types and amounts of raw materials used in the preparation of copper alloys in the second aspect of this invention are exactly the same as those described in the first aspect of this invention. To avoid repetition, the second aspect of this invention will not be repeated here, and those skilled in the art should not understand it as a limitation of this invention.

[0033] In this invention, the inventors discovered that by melting copper, aluminum, nickel, iron, manganese, tin, and rare earth metal sources and then casting them to prepare copper alloys, excellent mechanical properties can be obtained without forging, effectively avoiding plastic deformation caused by high temperature and high pressure during the forging process.

[0034] In this invention, the smelting can be carried out in conventional smelting equipment in the art, and preferably, the smelting is carried out in a medium-frequency induction furnace.

[0035] According to a particularly preferred embodiment of the present invention, the smelting includes: (1) The copper source, nickel source, iron source, manganese source, tin source and rare earth metal source are smelted for the first time; (2) Add aluminum source and then carry out a second smelting to obtain molten metal.

[0036] According to the present invention, preferably, the conditions for the first melting include: a temperature of 950-1050°C and a time of 10-15 min.

[0037] In this invention, when using a medium-frequency induction furnace for the first melting process, the temperature of the first melting can be controlled by controlling the heating current. For example, during the first melting process, the heating current is controlled at 290A and the heating time is 10-15 minutes to control the heating time to reach the required temperature for the first melting and maintain it stably.

[0038] According to the present invention, preferably, the conditions for the second melting include: a temperature of 1100-1200°C and a time of 3-8 minutes.

[0039] In this invention, when using a medium-frequency induction furnace for the second melting process, the temperature of the second melting can be controlled by adjusting the heating current. For example, during the second melting process, the heating current is controlled at 320A, and the heating time is 3-8 minutes to control the heating time to reach the required temperature for the second melting and maintain it stably.

[0040] In this invention, step (1) further includes: after heat preservation treatment of copper source, it is smelted with nickel source, iron source, manganese source, tin source and rare earth metal source for the first time.

[0041] According to the present invention, preferably, the heat preservation treatment conditions include: a temperature of 400-500℃ and a time of 10-15 minutes.

[0042] In this invention, when using a medium-frequency induction furnace for heat preservation, the temperature of the heat preservation process can be controlled by adjusting the heating current. For example, during the heat preservation process, the heating current is controlled at 270A, and the heating time is 20-25 minutes to achieve and maintain the required heat preservation temperature.

[0043] According to the present invention, preferably, the casting conditions are as follows: casting temperature is 900-1060℃, casting speed is 0.8-2.5m / s; mold temperature is 150℃-300℃; and casting time is 3-5s.

[0044] In this invention, when using a medium-frequency induction furnace for melting, the pouring temperature can be controlled by adjusting the heating current. For example, after the second melting is completed, the heating current is controlled at 320A, the heating time is 3-8 minutes, and then pouring begins.

[0045] In this invention, the range of casting shapes for the copper alloy is relatively wide, and those skilled in the art can select according to actual needs. For example, the casting shape can be a round bar, a hexagonal bar, a hollow cylinder, or a plate.

[0046] A third aspect of the present invention provides a composite material, wherein the composite material comprises a copper alloy and a carbon-containing material coated on the surface of the copper alloy; Wherein, the copper alloy is the copper alloy described in the first aspect, or the copper alloy prepared by the method described in the second aspect; The carbon-containing material comprises 10-30 wt% carbon fiber and 70-90 wt% resin.

[0047] In this invention, there is no particular limitation on the source of the carbon fiber. It can be a conventional choice in the field or it can be obtained commercially. Preferably, the carbon fiber has a length of 2500-3000μm, a diameter of 5-7μm, and an aspect ratio of 350-600:1.

[0048] According to a particularly preferred embodiment of the present invention, the resin is selected from at least one of nylon 6, nylon 66, nylon 1010, nylon 610, nylon 612, nylon 11, nylon 12, and nylon 46.

[0049] By using specific types of carbon fibers and resins, a better synergistic effect can be achieved, enabling the composite material to achieve superior mechanical properties while having a lower density.

[0050] Furthermore, the resin is selected from at least one of nylon 6, nylon 66, and nylon 46.

[0051] According to a particularly preferred embodiment of the present invention, the carbon-containing material accounts for 20-50 wt% of the total mass of the composite material. Adopting a mass percentage within this range allows the composite material to achieve superior mechanical properties while having a lower density.

[0052] Furthermore, based on the total mass of the composite material, the mass percentage of the carbon-containing material is 30-40 wt%.

[0053] According to a particularly preferred embodiment of the present invention, the density of the carbon-containing material is 1.5-1.7 g / cm³. 3 .

[0054] A fourth aspect of the present invention provides a method for preparing the composite material described in the third aspect, the method comprising the following steps: Under coating conditions, carbon-containing materials are coated onto the surface of copper alloys to obtain composite materials.

[0055] In this invention, the shape of the composite material has a wide range of options, and those skilled in the art can select it according to actual needs. For example, it can be a round bar, a hexagonal bar, a hollow cylinder, or a plate.

[0056] According to a particularly preferred embodiment of the present invention, the coating conditions include: a coating temperature of 150-300°C; a coating pressure of 50-200 MPa, preferably 80-160 MPa; and a coating time of 1-8 min.

[0057] According to a particularly preferred embodiment of the present invention, when the shape of the composite material is a plate with a diameter less than 2 mm, the coating pressure is 140-160 MPa and the coating time is 1-3 min; when the shape of the composite material is a plate with a diameter of 3-5 mm, the coating pressure is 120-140 MPa and the coating time is 2-4 min; when the shape of the composite material is a round bar or hexagonal bar with a diameter less than 25 mm, the coating pressure is 100-120 MPa and the coating time is 3-6 min; when the shape of the composite material is a round bar or hexagonal bar with a diameter greater than 25 mm, the coating pressure is 80-100 MPa and the coating time is 4-8 min.

[0058] According to a particularly preferred embodiment of the present invention, the method for preparing the composite material further includes: casting molten metal, and when the temperature drops to 150-300°C, coating the copper alloy surface with carbon fibers and resin to obtain the composite material; wherein the molten metal is the molten metal prepared by the method described in the second aspect. By adopting the above preparation method, not only can the heat of the copper alloy itself be effectively utilized, reducing the cost and time of reheating, but it can also effectively avoid the decline in mechanical properties of the copper alloy due to the formation of porosity and sand holes, as well as the changes in the structure or properties of the copper alloy due to reheating.

[0059] The fifth aspect of this invention provides the application of the copper alloy described in the first aspect, the copper alloy prepared by the method described in the second aspect, the composite material described in the third aspect, or the composite material prepared by the method described in the fourth aspect in the field of explosion-proof materials.

[0060] The present invention will be described in detail below through embodiments. The carbon fiber and resin are commercially available products, as detailed below: Carbon fiber: grade SCF-35S-L5-12K (tensile strength 3.5-4.0GPa, tensile modulus 220-260GPa), purchased from Shanghai Petrochemical Company; Resin: Grade PA6 (density 1.15 g / cm³) 3 Purchased from Hunan Petrochemical Company.

[0061] Preparation Example 1 Prepare various metal sources according to the copper alloy composition shown in Table 1.

[0062] (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal; (4) When the molten metal drops to 1060℃, it is poured at a speed of 2.5m / s, the mold temperature is 300℃, and the pouring time is 3s, to obtain a 1.5mm plate-shaped copper alloy Z1.

[0063] Preparation Examples 2-6, Comparative Preparation Examples 1-2 The preparation method is the same as in Preparation Example 1, except that the content of each metal in the copper alloy is shown in Table 1, and copper alloys Z2-Z6 and DZ1-DZ2 are finally obtained.

[0064] Table 1

[0065] Example 1 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal, the content of each component of molten metal is the same as in preparation example 2; (4) When the molten metal drops to 1060℃, take 450g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 300℃, add 238.5g of carbon-containing material to the mold, control the pressure to 120MPa, and keep it for 2min to obtain an 8mm round rod-shaped composite material S1.

[0066] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material S1 are shown in Table 2.

[0067] Example 2 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal, the content of each component of molten metal is the same as in preparation example 2; (4) When the molten metal drops to 1060℃, take 580g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 300℃, add 319g of carbon-containing material to the mold, control the pressure to 120MPa, and keep it for 2min to obtain an 8mm round rod-shaped composite material S2.

[0068] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material S2 are shown in Table 2.

[0069] Example 3 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal, the content of each component of molten metal is the same as in preparation example 2; (4) When the molten metal drops to 1060℃, take 720g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 300℃, add 324g of carbon-containing material to the mold, control the pressure to 120MPa, and keep it for 2min to obtain 8mm round rod-shaped composite material S3.

[0070] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material S3 are shown in Table 2.

[0071] Example 4 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal, the content of each component of molten metal is the same as in preparation example 2; (4) When the molten metal drops to 1060°C, take 8300g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 220°C, add 2490g of carbon-containing material to the mold, control the pressure to 130MPa, and keep it for 3min to obtain a 4mm plate-shaped composite material S4.

[0072] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material S4 are shown in Table 2.

[0073] Example 5 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal, the content of each component of molten metal is the same as in preparation example 2; (4) When the molten metal drops to 1060°C, take 10000g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 280°C, add 6000g of carbon-containing material to the mold, control the pressure to 110MPa, and keep it for 5min to obtain a 20mm hexagonal rod-shaped composite material S5.

[0074] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material S5 are shown in Table 2.

[0075] Example 6 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal, the content of each component of molten metal is the same as in preparation example 2; (4) When the molten metal drops to 1060°C, take 15000g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 280°C, add 7500g of carbon-containing material to the mold, control the pressure to 90MPa, and keep it for 6min to obtain a 50mm round rod-shaped composite material S6.

[0076] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material S6 are shown in Table 2.

[0077] Comparative Examples 1-2 Comparative Example 1 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, hold for 3 min to obtain molten metal, the content of each component of molten metal is the same as that of comparative preparation example 1; (4) When the molten metal drops to 1060℃, take 400g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 300℃, add 180g of carbon-containing material to the mold, control the pressure to 120MPa, and keep it for 2min to obtain 8mm round rod-shaped composite material D1.

[0078] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material D1 are shown in Table 2.

[0079] Comparative Example 2 (1) Add elemental copper to a medium-frequency induction furnace and keep it at 400℃ for 10 min; (2) Add elemental nickel, elemental iron, elemental manganese, elemental tin and elemental lanthanum to the medium frequency induction furnace, heat to 950℃ and hold for 10 min; (3) Add aluminum source to medium frequency induction furnace, heat to 1100℃, keep warm for 3 min to obtain molten metal. The content of each component of molten metal is the same as that of comparative preparation example 2. (4) When the molten metal drops to 1060℃, take 16000g of molten metal and pour it at a speed of 2.5m / s. After pouring, when the temperature of the copper alloy drops to 300℃, add 4000g of carbon-containing material to the mold, control the pressure to 120MPa, and keep it for 2min to obtain 8mm round rod-shaped composite material D2.

[0080] The content of copper alloy, carbon fiber content, average diameter and length, and resin nylon 66 content in composite material D2 are shown in Table 2.

[0081] Table 2

[0082] Test case The following performance tests were performed on the copper alloys prepared in the above preparation examples and comparative examples, as well as the composite materials prepared in the examples and comparative examples. The performance test results of the copper alloys are shown in Table 3, and the performance test results of the composite materials are shown in Table 4.

[0083] Hardness testing: The hardness of copper alloys and composite materials was determined according to GB / T-230.1-2018; Density test: Specifically, the density of a solid is measured using Archimedes' principle; Torque test: The torque test was performed on copper alloys and composite materials according to the GB / T-2613 series standards. Bending strength test: The composite material was tested according to GB / T-232-2024; Tensile strength test: The tensile strength of copper alloys and composite materials shall be determined in accordance with GB / T-228.1-2021; Tensile modulus test: The composite material was tested according to GB / T-228.1-2021; Elongation at break test: The elongation at break was determined for copper alloys and composite materials in accordance with GB / T-2567-2008; Explosion-proof performance test: The composite material is tested in accordance with GBT-10686-2013. Specifically, the explosion-proof test refers to the explosion-proof performance test method for beryllium copper alloy tools. Under the environment of combustible gas such as Class II Class C (hydrogen) and Class II Class B (ethylene), the explosion-proof performance of the composite material is tested by medium and high speed impact and free fall hammer method.

[0084] Table 3

[0085] As can be seen from the results in Table 3, the copper alloy provided by the present invention uses a specific amount of aluminum, nickel, iron, manganese, tin and rare earth metals combined with copper, which makes the copper alloy have excellent mechanical properties.

[0086] Table 4

[0087] As can be seen from the results in Table 4, the composite material made of the copper alloy of the present invention has excellent properties such as hardness, bending strength, tensile strength, tensile modulus, and torsional force. Furthermore, the composite material provided by the present invention meets the requirements of not igniting combustible gas hydrogen after 200 high-speed impacts and not igniting combustible gas after 150 free-fall hammer tests in the explosion-proof performance test, thus meeting the explosion-proof Class II Class C standard.

[0088] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A copper alloy, characterized in that, The copper alloy comprises the following components: 6-11 wt% aluminum; 3-5.5 wt% nickel; 2.8-5 wt% iron; 1-2 wt% manganese; 0.05-0.2wt% tin; 0.02-0.05 wt% rare earth metals; 76.25-87.13 wt% copper.

2. The copper alloy according to claim 1, wherein, The copper alloy comprises the following components: 7-10.5 wt% aluminum; 3.5-5 wt% nickel; 3-4.5 wt% iron; 1.2-1.8 wt% manganese; 0.08-0.15wt% tin; 0.035-0.045 wt% rare earth metals; 78-85.18 wt% copper.

3. The copper alloy according to claim 1 or 2, wherein, In the copper alloy, the mass ratio of nickel to iron is 0.9-1.1:

1.

4. The copper alloy according to any one of claims 1-3, wherein, The hardness HRC of the copper alloy is 20-30; Preferably, the density of the copper alloy is 7.58-7.6 g / cm³. 3 ; Preferably, the torque of the copper alloy is 236-375 N·m.

5. A method for preparing the copper alloy according to any one of claims 1-4, the method comprising the following steps: The copper, aluminum, nickel, iron, manganese, tin and rare earth metal sources are smelted to obtain a molten metal, and the molten metal is cast to obtain a copper alloy.

6. The method according to claim 5, wherein, The maximum temperature for smelting is 1100-1200℃; Preferably, the pouring conditions are: pouring temperature of 900-1060℃, pouring speed of 0.8-2.5m / s; mold temperature of 150℃-300℃; and pouring time of 3-5s.

7. A composite material, characterized in that, The composite material includes a copper alloy and a carbon-containing material coated on the surface of the copper alloy; Wherein, the copper alloy is the copper alloy described in any one of claims 1-4, or the copper alloy prepared by the method described in claim 5 or 6; The carbon-containing material comprises 10-30 wt% carbon fiber and 70-90 wt% resin.

8. The composite material according to claim 7, wherein, The carbon fiber has a length of 2500-3000 μm, an average diameter of 5-7 μm, and an aspect ratio of 350-600:1; Preferably, the resin is selected from at least one of nylon 6, nylon 66, nylon 1010, nylon 610, nylon 612, nylon 11, nylon 12 and nylon 46; Preferably, based on the total mass of the composite material, the mass percentage of the carbon-containing material is 20-50 wt%. Preferably, the density of the carbon-containing material is 1.5-1.7 g / cm³. 3 .

9. A method for preparing the composite material according to claim 7 or 8, the method comprising the following steps: Under coating conditions, carbon-containing materials are coated onto the surface of copper alloys to obtain composite materials; Preferably, the coating conditions include: a coating temperature of 150-300℃, a coating pressure of 50-260MPa, and a coating time of 1-8min.

10. The application of a copper alloy according to any one of claims 1-4, a copper alloy prepared by any one of claims 5 or 6, a composite material according to claim 7 or 8, or a composite material prepared by the method of claim 9 in the field of explosion-proof materials.

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