A carbon fiber reinforced copper-based composite material and its preparation method and application

Abstract

The present invention discloses a carbon fiber reinforced copper-based composite material, a preparation method and application thereof. Recycled carbon fiber is used as a reinforcing phase and a copper alloy is used as a matrix. A silver coating is prepared on the surface of the recycled carbon fiber by chemical plating technology. In combination with a powder metallurgy process, a multi-scale recycled carbon fiber reinforced copper-based composite material with good mechanical and wear resistance is prepared, thereby solving the problem of recycling recycled carbon fiber in the field of copper-based materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of recycling carbon fiber and reusing and preparing copper-based composite materials, and in particular relates to a carbon fiber reinforced copper-based composite material and a preparation method and application thereof. Background Art

[0002] In recent years, carbon fiber reinforced composite materials have been widely used in strategic fields such as aerospace, national defense, and ocean. With the development and production of a large number of major projects such as domestically produced large aircraft and heavy-lift launch vehicles, the use of carbon fiber composite materials is in a period of rapid growth.

[0003] It is foreseeable that a large amount of carbon fiber composite waste will be generated in the next few to ten years, with a renewable value of nearly 10 billion yuan. This waste will come from unqualified products and scraps generated during the production and molding process, as well as products that have reached the end of their service life and are expected to be scrapped.

[0004] With the continuous increase in energy consumption and the gradual improvement of pollution emission requirements, environmental protection and sustainable development issues are becoming increasingly prominent; compared with developed countries, my country's carbon fiber production capacity is relatively low.

[0005] Due to these issues, the recycling and reuse of carbon fiber has become a research hotspot. Since the 1970s, industry giants such as Boeing in the United States and Toray Industries in Japan have invested nearly 1 billion yuan in carbon fiber recycling research. As an important strategic material for national defense, the effective recycling and reuse of carbon fiber has become an urgent need in countries around the world. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the deficiencies in the above-mentioned prior art and provide a carbon fiber reinforced copper-based composite material and its preparation method and application. Recycled carbon fiber is used as a reinforcing phase and copper alloy is used as a matrix. A silver coating is prepared on the surface of the recycled carbon fiber by chemical plating technology, and a powder metallurgy process is combined to prepare a multi-scale recycled carbon fiber reinforced copper-based composite material with good mechanical and wear resistance, which is used to solve the technical problem of recycling recycled carbon fiber in the field of copper-based materials.

[0007] The present invention adopts the following technical solutions:

[0008] A method for preparing a carbon fiber reinforced copper-based composite material comprises the following steps: pre-cleaning, sensitization, activation and reduction of recycled carbon fibers in sequence; surface silver plating of the recycled carbon fibers; mixing with copper powder; and sintering to obtain a dense carbon fiber reinforced copper-based composite material.

[0009] Specifically, pre-cleaning is as follows:

[0010] The carbon fiber surface was cleaned with a 20-25 g / L NaOH aqueous solution for 30-60 min, then rinsed with distilled water until the pH was 7.0 and dried.

[0011] Specifically, the sensitization reaction is:

[0012] The pre-cleaned carbon fibers were sensitized by stirring a mixed solution of 15-20 ml / L HCl and 10-15 g / L SnCl2 for 15-30 minutes, and then rinsed with distilled water until the pH was 7.0 and dried.

[0013] Specifically, the activation reaction is:

[0014] The sensitized carbon fibers were activated by stirring a mixed solution of 15-20 ml / L HCl and 0.3-0.5 g / L PdCl2 for 15-30 minutes, then rinsed with distilled water until the pH was 7.0 and dried.

[0015] Specifically, the reduction reaction is:

[0016] The activated carbon fibers were stirred with a 40-45 g / L NaH2PO2·H2O solution for 15-30 min to undergo a reduction reaction, and then rinsed with distilled water until the pH value was 7.0 and dried.

[0017] Specifically, the size of the recycled carbon fiber is 16 to 100 meshes.

[0018] Specifically, the surface silver plating treatment of the recycled carbon fiber is as follows:

[0019] The recycled carbon fiber is added with 800-1000 mL of Tollen's reagent in a water bath at 50-55° C., the silver plating concentration of the recycled carbon fiber is 3.0-4.0 g / L, the stirring speed of the recycled carbon fiber is 350-360 rpm, the stirring time is 30 min-1 h, and the recycled carbon fiber is rinsed to neutrality and dried to obtain a silver-plated recycled carbon fiber with a complete surface coating.

[0020] Specifically, the recycled carbon fiber and pure copper powder are mixed and sintered as follows:

[0021] Recycled carbon fiber with a mass fraction of 1wt.% to 3wt.% and copper powder with a particle size of 200 to 325 meshes are mechanically stirred to obtain a mixed powder, and ethanol with a mass ratio of 1:1 to the mixed powder is added at the same time. After mixing for 2 to 2.5 hours, vacuum drying is carried out; SPS spark plasma sintering is adopted, and the temperature is raised from room temperature to the sintering temperature at a heating rate of 50 to 55°C / min during sintering, and then the saturated pressure is kept at 15 to 30 MPa for 15 to 20 minutes, and finally cooled with the furnace.

[0022] Another technical solution of the present invention is a carbon fiber reinforced copper matrix composite material, the hardness of the carbon fiber reinforced copper matrix composite material is greater than 70HV 0.1 , flexural strength is greater than 330MPa.

[0023] The third technical solution of the present invention is to apply carbon fiber reinforced copper-based composite materials to high-performance bearings, bushings and guide plates.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] A method for preparing a carbon fiber-reinforced copper-based composite material utilizes the silver coating of recycled carbon fibers for epitaxial growth at the interface front during the sintering process, forming nanoscale silver nanowires and creating an interfacial "stitching" effect. This improves the material's interfacial compatibility and bonding strength, while also utilizing the self-lubricating effect of the silver nanowires during friction to enhance the material's wear resistance. The recycled carbon fibers form a micrometer-scale quasi-continuous network structure within the composite material, interacting with the nanoscale silver nanowires to create a multi-scale structure. This creates a coupled reinforcement effect on the material's mechanical and wear-resistant properties, resulting in a multi-scale recycled carbon fiber-reinforced copper-based composite material with both excellent mechanical and wear-resistant properties, addressing the reuse of recycled carbon fibers in the copper-based material field.

[0026] Furthermore, pre-cleaning is to use 20-25 g / L NaOH aqueous solution to clean impurities attached to the carbon fiber surface for 30-60 minutes, then rinse it with distilled water to PH = 7.0 and dry it, which can ensure the removal of surface impurities and increase the surface hydrophilicity.

[0027] Furthermore, the sensitization reaction is to use a mixed solution of 15-20 ml / L HCl and 10-15 g / L SnCl2 to stir the pre-cleaned carbon fiber for 15-30 minutes for sensitization treatment, and then rinse it with distilled water to pH = 7.0 and dry it, which can ensure that a layer of sticky and reducing Sn(OH)Cl colloidal film is formed on the surface of the carbon fiber, so that it can adsorb metal ions in subsequent steps.

[0028] Furthermore, the activation reaction is to use a mixed solution of 15-20 ml / L HCl and 0.3-0.5 g / L PdCl2 to stir the sensitized carbon fiber for 15-30 minutes for activation treatment, then rinse it with distilled water to PH = 7.0 and dry it, which can ensure that a layer of (Pd, Sn 2+ ) film, thereby playing the role of catalyst and crystallization nucleation core.

[0029] Furthermore, the reduction reaction is to use 40-45g / L NaH2PO2·H2O solution to stir the activated carbon fiber for 15-30min to carry out the reduction reaction, and then rinse it with distilled water to PH=7.0 and dry it, which can ensure that Sn 2+ It is reduced and an active Pd film is attached to the surface of the reinforcement phase particles.

[0030] Furthermore, the scale of the recycled carbon fiber is 16-100 mesh, which can ensure that recycled carbon fibers of different scales can be processed.

[0031] Furthermore, the optimum concentration of silver plating on the recycled carbon fiber is 3.0-4.0 g / L, and the carbon fiber stirring speed is 350-360 rpm, which can ensure that the recycled carbon fiber does not agglomerate and entangle during pretreatment, and ensure that each fiber is evenly treated. 800-1000 mL of Tollen's reagent is added to the recycled carbon fiber in a 50-55°C water bath, stirred for 30 minutes to 1 hour, rinsed to neutrality, and dried to obtain silver-plated recycled carbon fiber with a complete surface coating, which can ensure that each fiber surface can obtain silver-plated carbon fiber with a complete surface coating.

[0032] Furthermore, the mass fraction of recycled carbon fiber is 1-3 wt.%, and the copper powder particle size is 200-325 mesh. The mixture is mechanically stirred in a mortar, and ethanol is added at a mass ratio of 1:1 to the powder. After mixing for 2-2.5 hours, vacuum drying is performed to ensure a uniform mixture of copper powder and recycled carbon fiber. Sintering is performed using SPS spark plasma sintering, with the temperature rising from room temperature to the sintering temperature at a rate of 50-55°C / min, followed by holding at a full load pressure of 15-30 MPa for 15-20 minutes, and finally cooled by a water cooling device in the furnace and removed as the furnace cools. This ensures a dense structure, diffusion and precipitation of the surface silver plating, and excellent material properties.

[0033] A carbon fiber-reinforced copper-based composite material with a hardness greater than 70HV0.1 and a flexural strength greater than 330MPa, exhibiting excellent mechanical and tribological properties. This material has promising applications in high-performance bearings, bushings, and guide plates. Compared to traditional materials, this material outperforms existing bearings, bushings, and guide plates, while significantly reducing raw material costs.

[0034] In summary, the present invention coats the surface of recycled carbon fibers with a silver coating, utilizing the numerous cracks and graphitized regions on the surface of the recycled carbon fibers to provide channels for epitaxial growth of silver nanowires. This creates a similar "stitching effect" at the interface front of the recycled carbon fiber-reinforced copper-based composite, improving the interfacial compatibility between the recycled carbon fibers and the matrix. Furthermore, the self-lubricating effect of the silver nanowires enhances the material's wear resistance. Furthermore, by controlling the length and fiber content of the recycled carbon fibers, a quasi-continuous network structure is formed within the copper-based composite, resulting in an optimized material structure.

[0035] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Surface morphology of recycled carbon fiber treated with silver plating;

[0037] Figure 2 This is the cross-sectional morphology of the recycled carbon fiber treated with silver plating;

[0038] Figure 3 Micromorphology of recycled carbon fiber reinforced copper matrix composites;

[0039] Figure 4 Hardness diagram of recycled carbon fiber reinforced copper matrix composites. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be described clearly and completely below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] In the present invention, unless otherwise specified, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical solution.

[0042] In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0043] In the present invention, unless otherwise specified, percentages (%) or parts refer to percentages by weight or parts by weight relative to the composition.

[0044] In the present invention, unless otherwise specified, the components involved or their preferred components can be combined with each other to form a new technical solution.

[0045] In this disclosure, unless otherwise specified, the numerical range "a-b" is an abbreviation for any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "6-22" indicates that all real numbers between "6-22" are listed herein, and "6-22" is merely an abbreviation for these numerical combinations.

[0046] The "range" disclosed in the present invention is in the form of lower limit and upper limit, which can be one or more lower limits, and one or more upper limits respectively.

[0047] In the present invention, the term "and / or" used herein refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0048] In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in accordance with the order. Preferably, the reaction method herein is carried out sequentially.

[0049] Unless otherwise indicated, the professional and scientific terms used herein are the same as those familiar to those skilled in the art. In addition, any method or material similar or equivalent to the described content can also be applied to the present invention.

[0050] Compared to the original carbon fiber, the surface of the recycled carbon fiber phase has a large amount of residual resin, crack damage and graphitized surface during the recycling process. The interface strength is lower when compounded with the copper matrix, which significantly deteriorates the mechanical properties of the material and seriously limits its application and promotion. The interface strength of the composite material directly affects its performance. Ideal interface strength can not only help improve the overall performance of the material, but also transfer the load borne by the copper matrix to the carbon fiber through the interface, giving full play to its reinforcing effect. However, because the carbon fiber does not react with the copper matrix and has poor wettability, the carbon / copper interface can only be mechanically engaged, resulting in poor interface compatibility and low bonding strength. When bearing load, the carbon fiber reinforcement is prone to pull-out, peeling or falling off, which seriously limits the development and application of related composite materials.

[0051] Therefore, the surface treatment technology is used to silver-plate the recycled carbon fiber to prepare a recycled carbon fiber reinforced copper-based composite material, which is expected to solve the above problems and meet future development needs.

[0052] The present invention provides a carbon fiber reinforced copper-based composite material, a preparation method and application thereof. Recycled carbon fiber is used as a reinforcing phase and a copper alloy is used as a matrix. A silver coating is prepared on the surface of the recycled carbon fiber by chemical plating technology. In combination with a powder metallurgy process, a multi-scale recycled carbon fiber reinforced copper-based composite material with good mechanical and wear resistance is prepared, thereby solving the problem of recycling recycled carbon fiber in the field of copper-based materials.

[0053] The present invention provides a method for preparing a carbon fiber reinforced copper-based composite material, comprising the following steps:

[0054] S1, pretreatment of the recycled carbon fiber surface, the pretreatment steps are divided into pre-cleaning, sensitization reaction, activation reaction and reduction reaction;

[0055] The scale of recycled carbon fiber is 16-100 mesh.

[0056] Pre-cleaning: Use 20-25 g / L NaOH aqueous solution to clean impurities attached to the surface of the carbon fiber for 30-60 minutes, then rinse it with distilled water to pH = 7.0 and dry it.

[0057] The sensitization reaction uses a mixed solution of 15-20 ml / L HCl and 10-15 g / L SnCl2 to stir the pre-cleaned carbon fiber for 15-30 minutes for sensitization treatment, and then rinses it with distilled water to pH = 7.0 and dry it.

[0058] The activation reaction uses a mixed solution of 15-20 ml / L HCl and 0.3-0.5 g / L PdCl2 to stir the sensitized carbon fiber for 15-30 minutes for activation treatment, and then rinse it with distilled water to pH = 7.0 and dry it.

[0059] The activated carbon fibers were subjected to a reduction reaction by stirring a 40-45 g / L NaH2PO2·H2O solution for 15-30 min, and then washed with distilled water until the pH value was 7.0 and dried.

[0060] S2, performing surface silver plating treatment on the recycled carbon fiber;

[0061] Add 800-1000 mL of Tollen's reagent to the recycled carbon fiber in a 50-55° C. water bath, stir for 30 min-1 h, rinse until neutral, and dry to obtain a silver-plated recycled carbon fiber with a complete surface coating.

[0062] The optimum concentration of silver plating for recycled carbon fiber is 3.0-4.0 g / L, and the stirring speed of carbon fiber is 350-360 rpm.

[0063] See also Figure 1 The surface morphology of the recycled carbon fiber silver-plated is clearly visible, the surface coating is complete, and the phase characterization is clear and accurate.

[0064] See also Figure 2 The cross-sectional morphology of the recycled carbon fiber silver-plated is clearly visible and the coating thickness is controllable.

[0065] S3, mixing the recycled carbon fiber and pure copper powder and sintering them.

[0066] The mass fraction of the recycled carbon fiber is 1-3 wt.%, and the particle size of the copper powder is 200-325 meshes.

[0067] The mixture was mechanically stirred in a mortar, and ethanol was added at a mass ratio of 1:1 to powder. The mixture was mixed for 2 to 2.5 hours and then vacuum dried.

[0068] The sintering adopts SPS spark plasma sintering. During sintering, the temperature is raised from room temperature to the sintering temperature at a heating rate of 50-55°C / min, and then kept warm for 15-20 minutes at a full load pressure of 15-30MPa. Finally, the temperature is lowered by the water cooling device in the furnace and the furnace is cooled and taken out.

[0069] The present invention discloses a carbon fiber reinforced copper-based composite material with a hardness greater than 70HV0.1 and a flexural strength greater than 330MPa. The recycled carbon fibers form a micrometer-scale quasi-continuous network structure in the composite material tissue, and interact with nanometer-scale silver nanowires to produce a multi-scale structure, thereby forming a coupled strengthening effect on the mechanical and wear-resistant properties of the material. The multi-scale recycled carbon fiber reinforced copper-based composite material has both good mechanical and wear-resistant properties, thereby solving the problem of recycling recycled carbon fibers in the field of copper-based materials.

[0070] See also Figure 3 , the micromorphology of recycled carbon fiber reinforced copper-based composite materials is clear and accurate in phase characterization.

[0071] See also Figure 4 , recycled carbon fiber reinforced copper-based composite materials have high hardness and excellent mechanical properties.

[0072] The carbon fiber reinforced copper-based composite material of the present invention can be applied to high-performance bearings, bushings and guide plates.

[0073] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0074] Example 1

[0075] High-performance bearings

[0076] 1) Surface pretreatment of recycled carbon fibers, including pre-cleaning, sensitization, activation, and reduction steps;

[0077] The recovered carbon fibers were sized at 1100 mesh and pre-cleaned with a 25 g / L NaOH aqueous solution for 60 min to remove impurities attached to the carbon fiber surface. The carbon fibers were then rinsed with distilled water until the pH reached 7.0 and dried.

[0078] The sensitization reaction was carried out by stirring the pre-cleaned carbon fibers with a mixed solution of 20 ml / L HCl and 15 g / L SnCl2 for 30 min, then rinsing them with distilled water to pH = 7.0 and drying them;

[0079] The activation reaction is to use a mixed solution of 20ml / L HCl and 0.5g / L PdCl2 to activate the sensitized carbon fiber by stirring for 30min, then rinse it with distilled water to pH=7.0 and dry it;

[0080] The reduction reaction was carried out by stirring the activated carbon fibers with 45 g / L NaH2PO2·H2O solution for 30 min, then rinsing with distilled water until the pH was 7.0 and drying.

[0081] The optimum concentration of silver plating for recycled carbon fiber is 4.0 g / L, and the stirring speed of carbon fiber is 360 rpm.

[0082] 2) Silver-plating the recycled carbon fiber. Add 1000 mL of Tollen's reagent to the recycled carbon fiber in a 55°C water bath, stir for 1 hour, rinse until neutral, and dry to obtain a silver-plated recycled carbon fiber with a complete surface coating.

[0083] 3) Mixing the recycled carbon fiber with pure copper powder and sintering the mixture.

[0084] The mass fraction of the recycled carbon fiber is 3 wt.%, and the particle size of the copper powder is 325 meshes.

[0085] The mixture was mechanically stirred in a mortar, and ethanol was added at a mass ratio of 1:1 to powder. After mixing for 2 h, the mixture was vacuum dried.

[0086] The sintering adopts SPS spark plasma sintering. During sintering, the temperature is raised from room temperature to the sintering temperature at a heating rate of 55℃ / min, and then kept warm for 20 minutes at a full load pressure of 30MPa. Finally, the temperature is cooled by the water cooling device in the furnace and taken out with the furnace cooling.

[0087] It has both good mechanical and wear-resistant properties, greatly reduces the cost of raw materials, and solves the problem of reuse of recycled carbon fiber in the field of copper-based materials.

[0088] Example 2

[0089] electromagnetic gun rails

[0090] 1) Surface pretreatment of recycled carbon fibers, including pre-cleaning, sensitization, activation, and reduction steps;

[0091] The recovered carbon fibers were sized at 50 mesh and pre-cleaned with a 22 g / L NaOH aqueous solution for 45 min to remove impurities attached to the carbon fiber surface. The carbon fibers were then rinsed with distilled water until the pH reached 7.0 and dried.

[0092] The sensitization reaction was carried out by stirring the pre-cleaned carbon fibers with a mixed solution of 18 ml / L HCl and 18 g / L SnCl2 for 20 min, then rinsing them with distilled water to pH = 7.0 and drying them;

[0093] The activation reaction is to use a mixed solution of 18 ml / L HCl and 0.4 g / L PdCl2 to activate the sensitized carbon fiber for 20 minutes, then rinse it with distilled water to pH = 7.0 and dry it;

[0094] The reduction reaction was carried out by stirring the activated carbon fibers with 43 g / L NaH2PO2·H2O solution for 20 min, then rinsing with distilled water until the pH was 7.0 and drying.

[0095] The optimum concentration of silver plating for recycled carbon fiber is 3.5 g / L, and the stirring speed of carbon fiber is 355 rpm.

[0096] 2) Silver-plating the recycled carbon fiber: Add 900 mL of Tollen's reagent to the recycled carbon fiber in a 50°C water bath, stir for 45 minutes, rinse until neutral, and dry to obtain a silver-plated recycled carbon fiber with a complete surface coating;

[0097] 3) Mixing the recycled carbon fiber with pure copper powder and sintering the mixture.

[0098] The mass fraction of the recycled carbon fiber is 2 wt.%, and the particle size of the copper powder is 275 meshes.

[0099] The mixture was mechanically stirred in a mortar, and ethanol was added at a mass ratio of 1:1 to powder. After mixing for 2 h, the mixture was vacuum dried.

[0100] The sintering was carried out by SPS spark plasma sintering. During sintering, the temperature was raised from room temperature to the sintering temperature at a heating rate of 55°C / min, and then kept at a full load pressure of 20 MPa for 18 minutes. Finally, the temperature was lowered by a water cooling device in the furnace and the product was taken out with the furnace cooling.

[0101] It has both good mechanical and wear-resistant properties, greatly reduces the cost of raw materials, and solves the problem of reuse of recycled carbon fiber in the field of copper-based materials.

[0102] Example 3

[0103] Pantograph slide

[0104] 1) Surface pretreatment of recycled carbon fibers, including pre-cleaning, sensitization, activation, and reduction steps;

[0105] The recovered carbon fibers were sized at 16 mesh and pre-cleaned with a 20 g / L NaOH aqueous solution for 30 min to remove impurities attached to the carbon fiber surface. The carbon fibers were then rinsed with distilled water until the pH reached 7.0 and dried.

[0106] The sensitization reaction was carried out by stirring the pre-cleaned carbon fibers with a mixed solution of 15 ml / L HCl and 10 g / L SnCl2 for 15 min, then rinsing them with distilled water to pH = 7.0 and drying them;

[0107] The activation reaction is to use a mixed solution of 15 ml / L HCl and 0.3 g / L PdCl2 to activate the sensitized carbon fiber by stirring for 15 minutes, then rinse it with distilled water to pH = 7.0 and dry it;

[0108] The reduction reaction was carried out by stirring the activated carbon fibers with 40 g / L NaH2PO2·H2O solution for 15 min, then rinsing with distilled water until the pH was 7.0 and drying;

[0109] The optimum concentration for silver plating of recycled carbon fiber is 3.0 g / L, and the stirring speed of carbon fiber is 350 rpm.

[0110] 2) Silver-plating the recycled carbon fiber. Add 800 mL of Tollen's reagent to the recycled carbon fiber in a 50°C water bath, stir for 30 minutes, rinse until neutral, and dry to obtain a silver-plated recycled carbon fiber with a complete surface coating.

[0111] 3) Mixing the recycled carbon fiber with pure copper powder and sintering the mixture.

[0112] The mass fraction of recycled carbon fiber is 1wt.%, and the particle size of copper powder is 200 mesh;

[0113] The mixture was mechanically stirred in a mortar, and ethanol was added at a mass ratio of 1:1 to powder. After mixing for 2.5 h, the mixture was vacuum dried;

[0114] The sintering was carried out by SPS spark plasma sintering. During sintering, the temperature was raised from room temperature to the sintering temperature at a heating rate of 50°C / min, and then kept at a full load pressure of 15 MPa for 15 minutes. Finally, the temperature was lowered by a water cooling device in the furnace and the product was taken out with the furnace cooling.

[0115] It has both good mechanical and wear-resistant properties, greatly reduces the cost of raw materials, and solves the problem of reuse of recycled carbon fiber in the field of copper-based materials.

[0116] In summary, the present invention provides a carbon fiber reinforced copper-based composite material and its preparation method and application. The preparation process is highly controllable and easy to automate. It can be widely promoted and applied in the fields of carbon fiber recycling and reuse and copper-based composite materials, so that it can exert excellent comprehensive performance when in service and promote the development of my country's economic construction.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a carbon fiber reinforced copper-based composite material, characterized in that: The recycled carbon fibers are sequentially subjected to pre-cleaning, sensitization, activation, and reduction reactions. The surfaces of the recycled carbon fibers are then silver-plated, mixed with copper powder, and sintered to obtain a dense carbon fiber-reinforced copper-based composite material. Sensitization reactions are specifically: The pre-cleaned carbon fibers were sensitized with a mixture of 15-20 ml / L HCl and 10-15 g / L SnCl2 for 15-30 minutes, then rinsed with distilled water until the pH reached 7.0 and dried. The reduction reaction is specifically: The activated carbon fibers were reduced by stirring with 40-45 g / L NaH2PO2·H2O solution for 15-30 min, then rinsed with distilled water to pH 7.0 and dried. The specific steps of mixing recycled carbon fiber with pure copper powder and sintering are as follows: Recycled carbon fiber with a mass fraction of 1wt.%~3wt.% and copper powder with a particle size of 200~325 mesh are mechanically stirred to obtain a mixed powder, and ethanol with a mass ratio of 1:1 to the mixed powder is added at the same time. After mixing for 2~2.5 hours, vacuum drying is carried out; SPS spark plasma sintering is adopted, and the temperature is raised from room temperature to the sintering temperature at a heating rate of 50~55℃ / min during sintering, and then the saturated pressure is kept at 15~30 MPa for 15~20 minutes, and finally cooled with the furnace.

2. The method for preparing a carbon fiber reinforced copper-based composite material according to claim 1, characterized in that: Pre-cleaning is as follows: The carbon fiber surface was cleaned with a 20-25 g / L NaOH aqueous solution for 30-60 min, then rinsed with distilled water until the pH was 7.0 and dried.

3. The method for preparing a carbon fiber reinforced copper-based composite material according to claim 1, characterized in that: The specific activation reaction is: The sensitized carbon fibers were activated by stirring a mixed solution of 15-20 ml / L HCl and 0.3-0.5 g / L PdCl2 for 15-30 minutes, then rinsed with distilled water to pH 7.0 and dried.

4. The method for preparing a carbon fiber reinforced copper-based composite material according to claim 1, wherein: The scale of recycled carbon fiber is 16~100 mesh.

5. The method for preparing a carbon fiber reinforced copper-based composite material according to claim 1, characterized in that: The specific process of silver plating the recycled carbon fiber is as follows: The recycled carbon fiber was added with 800-1000 mL of Tollen's reagent in a 50-55°C water bath. The silver plating concentration of the recycled carbon fiber was 3.0-4.0 g / L. The stirring speed of the recycled carbon fiber was 350-360 rpm and the stirring time was 30 min-1 h. After rinsing to neutrality and drying, the silver-plated recycled carbon fiber with a complete surface coating was obtained.

6. A carbon fiber reinforced copper-based composite material, characterized in that: Prepared by the method for preparing a carbon fiber reinforced copper-based composite material according to any one of claims 1 to 5, the carbon fiber reinforced copper-based composite material has a hardness greater than 70 HV 0.1 , the flexural strength is greater than 330 MPa.

7. The carbon fiber reinforced copper-based composite material according to claim 6 is used in high-performance bearings, bushings and guide plates.

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