Metal wire reinforced carbon fiber composite material and preparation method thereof

Abstract

The invention discloses a metal wire reinforced carbon fiber composite material and a preparation method thereof. The metal wire reinforced carbon fiber composite material comprises axial carbon fiber wires and metal wires which are arranged in a staggered manner, netlike chopped silicon carbide fibers are arranged among netlike pores formed by staggering the axial carbon fiber wires and the metal wires; silicon carbide is coated at the interlaced points of the metal wires and the axial carbon fiber wires; normal carbon fiber wires are arranged in the normal direction of the metal wire reinforced carbon fiber composite material; the intersection points of the normal carbon fiber lines and the metal wires comprise silicon carbide; under the condition that the thickness is reduced, the tensile fracture resistance is high in a high-temperature environment, the heat insulation performance is high, and the problems that the yield is low and the tensile fracture resistance is low in the high-temperature environment due to the fact that the expansion coefficient difference between the carbon fibers and the compounded material is large are solved; meanwhile, the problem that the whole material is damaged or deformed due to delamination, separation or relative sliding of the carbon fiber and the compounded material in the using process is avoided.

Description

Technical Field

[0001] The present invention relates to the field of carbon fiber composite materials, and particularly to the field of a metal wire reinforced carbon fiber composite material and a preparation method thereof. Background Art

[0002] At present, carbon fiber reinforced silicon carbide (C / SiC) composite materials are widely used in the thermal protection parts of high-speed aircraft, such as components like nose cones, leading edges of wings, engine nozzles, etc., and are advanced composite materials with excellent high-temperature resistance, oxidation resistance, and erosion resistance.

[0003] Common methods for preparing C / SiC composite materials include chemical vapor deposition, reaction infiltration, and impregnation pyrolysis. Among them, impregnation pyrolysis has unique advantages for the preparation of complex structure samples, but there are many problems such as easy blockage of pores, resulting in increased densification of the material, reduced toughness, and reduced heat insulation performance; in addition, for example, the thermal expansion coefficient of carbon fiber is almost negative at room temperature, while the thermal expansion coefficient of SiC is 4.007×10-6 / K at room temperature. When the temperature is below 1000°C, the thermal expansion coefficient of silicon carbide is 4.7×10-6 / K. The difference in thermal expansion coefficients between the two is relatively large. The common treatment temperature of C / SiC composite materials is around 1300°C. At this treatment temperature, the difference in thermal expansion coefficients between the two is very large. During repeated heat treatment processes, the shrinkage and expansion behaviors of the two components in the matrix will generate permanent stress, that is, the difference in thermal expansion coefficients between carbon fiber and ceramic matrix will lead to crack propagation. This kind of damage will be further amplified for thin-walled special-shaped parts with a thickness of less than 5 mm, especially less than 3 mm. During the preparation process, it is easy to cause cracking of semi-finished products, affecting the product qualification rate; at the same time, processing will damage the continuity of the fibers and reduce the mechanical properties of the fibers.

[0004] Therefore, how to prepare a carbon fiber composite material with strong tensile fracture resistance and high heat insulation performance in a high-temperature environment while reducing the thickness, avoiding the problem of low finished product rate due to the large difference in expansion coefficients between carbon fiber and the composite material, and low tensile fracture resistance in a high-temperature environment, and at the same time avoiding problems such as delamination, separation, or relative sliding between carbon fiber and the composite material during use, resulting in damage or deformation of the overall material, has become a difficult problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The object of the present invention is to provide a metal wire reinforced carbon fiber composite material and a preparation method thereof, which can achieve strong tensile fracture resistance and high heat insulation performance in a high-temperature environment while reducing the thickness, and avoid the problems of low yield and low tensile fracture resistance in a high-temperature environment due to the large difference in the expansion coefficients between the carbon fiber and the composite material. At the same time, it can avoid the problems of delamination, separation or relative sliding between the carbon fiber and the composite material during use, resulting in damage or deformation of the overall material.

[0006] According to one aspect of the present invention, there is provided a metal wire reinforced carbon fiber composite material, including axially arranged carbon fiber wires and metal wires arranged alternately;

[0007] There are reticulated short-cut silicon carbide fibers arranged in the reticulated pores where the axially arranged carbon fiber wires and the metal wires are alternately arranged; the intersection points of the metal wires and the axially arranged carbon fiber wires are coated with silicon carbide;

[0008] The metal wire reinforced carbon fiber composite material is provided with normal carbon fiber wires in the normal direction;

[0009] The intersection points of the normal carbon fiber wires and the metal wires include silicon carbide; preferably, the metal wire is a molybdenum lanthanum alloy.

[0010] The beneficial effects of the present invention compared with the prior art are as follows: by the metal wire reinforced carbon fiber composite material including axially arranged carbon fiber wires and metal wires arranged alternately, the strength and mechanical properties of the metal wire reinforced composite material are good; through the alternate arrangement, the combination and distribution of the metal wire and the carbon fiber are uniform, realizing the mechanical properties, high-temperature resistance, oxidation resistance and erosion resistance of the overall composite material;

[0011] By the metal wire reinforced carbon fiber composite material being provided with normal carbon fiber wires in the normal direction, problems such as sliding or displacement between each layer do not occur, and deformation or damage of the overall composite material does not occur;

[0012] By the intersection points of the metal wires and the axially arranged carbon fiber wires being coated with silicon carbide, and the intersection points of the normal carbon fiber wires and the metal wires including silicon carbide, after the intersection of the metal wire and the carbon fiber is fixed by the wrapped silicon carbide, relative displacement will not occur, thus avoiding the problems of delamination, separation or relative sliding between the carbon fiber and the composite material during use, resulting in damage or deformation of the overall material;

[0013] By preferably using the metal wire as a molybdenum lanthanum alloy, the expansion coefficients of the metal wire and the carbon fiber are further made similar, achieving strong tensile fracture resistance and high heat insulation performance in a high-temperature environment, and avoiding the problems of low yield and low tensile fracture resistance in a high-temperature environment due to the large difference in the expansion coefficients between the carbon fiber and the composite material;

[0014] Because finally, when the wire-reinforced carbon fiber composite material has a thickness less than 5 mm, even less than 3 mm, it has strong tensile fracture resistance and high heat insulation performance in a high-temperature environment.

[0015] Further, the thickness of the wire-reinforced carbon fiber composite material is 2.5 - 5 mm, and the density is 1.9 - 2.2 g / cm 3 ; the porosity is 5 - 7%; the thermal conductivity is 6 - 10 W / mK; after the wire-reinforced carbon fiber composite material is oxidized at 1200 °C for 0.5 hours, the drawing fracture load ≥ 7960 N, and after being oxidized at 1300 °C for 2.5 hours, the drawing fracture load ≥ 4792 N; the non-fatigue fracture time ≥ 100 hours at 1600 °C; preferably, the thickness of the wire-reinforced carbon fiber composite material is 2.5 - 3 mm.

[0016] The beneficial effect of adopting the previous technical solution is that through the wire-reinforced carbon fiber composite material, when the thickness is low, that is, the thickness is 2.5 - 5 mm, it has strong tensile fracture resistance, strong toughness, strong anti-fatigue fracture performance, and good heat insulation performance in a high-temperature environment.

[0017] Further, the diameter of the wire is 0.2 - 0.5 mm, and the wire is a molybdenum lanthanum alloy wire;

[0018] The volume ratio of the wire to the axial carbon fiber line is (40 - 60):(60 - 40);

[0019] and / or

[0020] The intersection points of the normal carbon fiber lines and the axial carbon fiber lines include silicon carbide.

[0021] The beneficial effect of adopting the previous technical solution is that it is beneficial to firmly fix the normal carbon fiber lines and the axial carbon fiber lines at the intersection points, and further beneficial to improving the strength of the composite material.

[0022] According to another aspect of the present invention, a method for preparing a wire-reinforced carbon fiber composite material is provided, including the following steps: preparing a first slurry, preparing a second slurry, and preparing a third slurry;

[0023] Immerse the wire and the axial carbon fiber lines in the first slurry and the second slurry respectively, and then dry them to obtain the formed wire and the formed axial carbon fiber lines;

[0024] Intertwine and wind the formed wire and the formed axial carbon fiber lines on the surface of the first mold, and then perform a first heating to form a first braided body on the surface of the first mold;

[0025] After detaching the first braided body from the first mold, needle sewing is performed along the normal phase surface of the first braided body using normal carbon fiber threads to obtain a second braided body;

[0026] The second braided body is subjected to a secondary heat treatment to obtain a third braided body;

[0027] The third braided body is impregnated in a third slurry and subjected to three heatings to obtain the wire-reinforced carbon fiber composite material.

[0028] The beneficial effects of the present invention compared with the prior art are as follows: by impregnating the wire and the axial carbon fiber threads in the first slurry and the second slurry respectively, and then drying, the forming wire and the forming axial carbon fiber threads are obtained; surface modification of the wire and the axial carbon fiber threads is realized;

[0029] Through the first braided body obtained by the staggered winding on the surface of the first mold, the uniform distribution of the wire and the carbon fiber is realized, and the staggered points are uniformly provided;

[0030] By using normal carbon fiber threads to perform needle sewing along the normal phase surface of the first braided body to obtain a second braided body, the phenomenon of wrong layers inside the second braided body is avoided;

[0031] By impregnating the third braided body in the third slurry, short-cut silicon carbide fibers are introduced into the staggered pores of the third braided body, which is beneficial to obtaining a composite material with high toughness, no increase in material thickness, high porosity and controllable pore diameter.

[0032] Furthermore, the first slurry includes silicon powder, ethanol, and silica sol; the preparation process of the first slurry is to mix silicon powder, ethanol, and silica sol according to the mass ratio of (2 - 5):10:(1 - 2);

[0033] The second slurry includes furan resin or phenolic resin and a solvent, the solvent includes ethanol or methanol, and the viscosity of the second slurry is 60 - 80 mPa·s;

[0034] The third slurry includes short-cut silicon carbide fibers and liquid polycarbosilane; the mass ratio of the short-cut silicon carbide fibers to the liquid polycarbosilane is (2 - 3):5;

[0035] Preferably, the aspect ratio of the short-cut silicon carbide fibers is 1.5 - 1.9:1; the particle size of the silicon powder is 0.5 - 0.9 microns.

[0036] The beneficial effects of adopting the previous technical solution are as follows: after modification by including silicon powder in the first slurry, silicon powder adheres to the surface of the metal wire, so that silicon powder adhered to the surface of the metal wire and the carbon fiber wire form silicon carbide coated at the sintering joint of the metal wire and the carbon fiber at the intersection point after sintering, increasing the strength of the joint between the metal wire and the carbon fiber, and ultimately improving the strength of the composite material;

[0037] By including silica sol in the first slurry, it is beneficial for silicon powder to adhere to the surface of the metal wire during the modification process; the intersection point of the metal wire and the carbon fiber wire is bonded by the organic resin before heating, but during the subsequent heating process, after the organic resin decomposes and volatilizes, the silica sol further helps to increase the bonding strength at the intersection point of the metal wire and the carbon fiber wire. Until finally, silicon on the surface of the metal wire reacts with the carbon fiber to form silicon carbide and adheres to the intersection point after sintering, so that during the preparation process and subsequent use process, the fibers inside the metal wire reinforced carbon fiber composite material will not delaminate, separate or relatively slide, resulting in damage or deformation of the overall material;

[0038] By including furan resin or phenolic resin in the second slurry, when the metal wire and the carbon fiber wire are intertwined, the fibers at the intersection point are bonded and fixed;

[0039] By the aspect ratio of the chopped silicon carbide fiber being 1.5 - 1.9:1, the subsequent chopped silicon carbide fibers are filled between the pores of the first braid, improving the toughness of the finished composite material, while avoiding an increase in the thickness of the finished composite material; by the particle size of the silicon powder being 0.5 - 0.9 microns, it is beneficial for the silicon powder to adhere uniformly to the surface of the metal wire and not significantly increase the thickness of the finished product.

[0040] Further, the preparation method of the third slurry is to impregnate the chopped silicon carbide fiber in liquid polycarbosilane and then dry it at a drying temperature of 100 - 180 °C, and then disperse it in pure water to obtain the third slurry.

[0041] The beneficial effects of adopting the previous technical solution are as follows: by attaching polycarbosilane to the surface of the chopped silicon carbide fiber, the intersection points of the chopped silicon carbide fibers dispersed in the pores of the first braid are coated with silicon carbide formed during the sintering process of polycarbosilane, so that the bonding strength between the chopped silicon carbide fibers is high, and the problem that the pores between the chopped silicon carbide fibers are filled with silicon nitride formed by polycarbosilane caused by directly impregnating the polycarbosilane solution is avoided, thus avoiding the problem of porosity reduction or uncontrollable porosity.

[0042] Further, before the normal carbon fiber wire stitches the first braid by needling, the normal carbon fiber wire is impregnated and dried in the first slurry.

[0043] The beneficial effects of adopting the previous technical solution are as follows: it is further conducive to the attachment of silicon carbide at the intersection points of the normal carbon fiber wires and the axial carbon fiber wires, increasing the strength between the two fibers.

[0044] Further, the metal wire is a molybdenum lanthanum alloy wire, and the diameter of the molybdenum lanthanum alloy wire is 0.2 - 0.5 mm;

[0045] The winding angle of the axial carbon fiber wire is 55 - 60°, the number of winding cut points is 5 - 7 cut points, and it is wound 8 - 10 layers.

[0046] The beneficial effects of adopting the previous technical solution are as follows: by using the molybdenum lanthanum alloy as the metal wire, it is further realized that the expansion coefficients of the metal wire and the carbon fiber are similar, with strong anti - tensile fracture performance and high heat insulation performance in a high - temperature environment, avoiding the problems of low product yield and low anti - tensile fracture performance in a high - temperature environment due to the large difference in the expansion coefficients between the carbon fiber and the composite material;

[0047] By setting the winding angle of the axial carbon fiber wire to 55 - 60° and the number of winding cut points to 5 - 7 cut points, while meeting the strength requirements of the obtained first braided body, the formed pores are large, which is beneficial to the subsequent filling of silicon carbide fibers, thereby improving the toughness on the premise of a relatively low thickness of the metal - wire - reinforced carbon fiber composite material.

[0048] Further, after the first braided body is detached from the first mold, the first braided body is sleeved on the surface of the second mold, and then a normal carbon fiber wire is used to perform needle sewing along the normal plane of the first braided body to obtain a second braided body;

[0049] The second braided body sleeved on the surface of the second mold is subjected to secondary heat treatment to obtain a third braided body;

[0050] The third braided body is impregnated in the third slurry, and the shape of the third braided body is maintained by sleeving a third mold on the surface of the third braided body, and then it is heated three times to obtain the metal - wire - reinforced carbon fiber composite material;

[0051] Preferably, the first mold is of a columnar structure; the second mold includes a support member with a number of pores, and the number of support members form a hollow columnar structure; the second mold is a hollow columnar structure provided with a number of pores.

[0052] Further, the primary heating temperature is 40 - 60 °C;

[0053] The secondary heating process is as follows: it is heated from room temperature to 100 - 120 °C at a heating rate of 9 - 10 °C / min; the temperature is heated from 100 - 120 °C to 600 - 800 °C at a heating rate of 3 - 4 °C / min;

[0054] The three heating processes are: heating in an inert gas atmosphere, heating from room temperature to 200-280°C, with a heating rate of 8-10°C / min, heating at 200-280°C for 3-5 hours; heating from 200-280°C to 1300-1400°C, with a heating rate of 3-4°C / min.

[0055] The beneficial effect of adopting the above technical solution is that the furan resin or phenolic resin is solidified by the first heating temperature so that the metal wire fibers and the axial carbon fiber lines are bonded together at the staggered points;

[0056] The secondary heating process is to heat the temperature from room temperature to 100-120°C at a heating rate of 9-10°C / min, so that small volatile molecules such as ethanol, methanol, and water in the second braided body can be quickly volatilized to form through-holes, which is conducive to the subsequent volatilization of large molecules through the formed holes; the temperature is raised from 100-120°C to 600-800°C at a heating rate of 3-4°C / min, so that the internal organic matter is slowly decomposed and gasified, and then slowly volatilized through the channels formed by small molecules, avoiding large cracks or damage inside the second braided body; at the same time, during this process, while the organic matter is volatilized, the strength of the silica sol is further increased, avoiding the problem of reduced strength of the fiber interlacing points after the organic matter is volatilized but before silicon carbide is generated.

[0057] The three heating processes achieve the sintering of the metal wire reinforced carbon fiber composite material, and at the same time achieve the sintering of the silicon attached to the fiber surface and the carbon in contact with it to obtain silicon carbide, thereby increasing the internal strength of the metal wire reinforced carbon fiber composite material and avoiding the oxidation of the carbon fiber during the sintering process. DETAILED DESCRIPTION

[0058] In order to better understand the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments.

[0059] Embodiment 1:

[0060] One aspect of the present embodiment provides a metal wire reinforced carbon fiber composite material, comprising axial carbon fiber wires and metal wires arranged in a staggered manner; a mesh of short-cut silicon carbide fibers is arranged between the mesh pores of the staggered axial carbon fiber wires and metal wires; and the intersections of the metal wires and the axial carbon fiber wires are coated with silicon carbide;

[0061] The metal wire reinforced carbon fiber composite material is normally provided with normal carbon fiber wires;

[0062] The intersection points of the normal carbon fiber lines and the metal wires include silicon carbide; and the metal wires are molybdenum-lanthanum alloys.

[0063] The metal wire reinforced carbon fiber composite material has a thickness of 3 mm and a density of 2.1 g / cm3 ; The porosity is 6.5%; the thermal conductivity is 7 W / mK; after the wire-reinforced carbon fiber composite is oxidized at 1200 °C for 0.5 hours, the drawing fracture load is 7990 N, and after being oxidized at 1300 °C for 2.5 hours, the drawing fracture load is 4860 N; the time without fatigue fracture at 1600 °C is 120 hours.

[0064] The diameter of the wire is 0.4 mm, and the wire is a molybdenum lanthanum alloy wire; the volume ratio of the wire to the axial carbon fiber wire is 55:45.

[0065] Another aspect of this embodiment provides a method for preparing a wire-reinforced carbon fiber composite, which includes the following steps: preparing a first slurry, preparing a second slurry, and preparing a third slurry;

[0066] The first slurry includes silicon powder, ethanol, and silica sol; in the preparation process of the first slurry, the silicon powder, ethanol, and silica sol are mixed according to a mass ratio of 3.5:10:1.5;

[0067] The second slurry includes furan resin and a solvent, the solvent includes ethanol, and the viscosity of the second slurry is 70 mPa·s;

[0068] The third slurry includes chopped silicon carbide fibers and liquid polycarbosilane; the mass ratio of the chopped silicon carbide fibers to the liquid polycarbosilane is 2.5:5; the aspect ratio of the chopped silicon carbide fibers is 1.8:1; the particle size of the silicon powder is 0.8 microns; the preparation method of the third slurry is to impregnate the chopped silicon carbide fibers in the liquid polycarbosilane and then dry them at a drying temperature of 140 °C, and then disperse them in pure water to obtain the third slurry.

[0069] Immerse the wire and the axial carbon fiber wire in the first slurry and the second slurry respectively, and then dry them to obtain a formed wire and a formed axial carbon fiber wire; the wire is a molybdenum lanthanum alloy wire, and the diameter of the molybdenum lanthanum alloy wire is 0.35 mm;

[0070] Intertwine the formed wire and the formed axial carbon fiber wire around the surface of the first mold, and then perform a first heating to form a first braided body on the surface of the first mold; the winding angle of the axial carbon fiber wire is 57°, the number of winding cut points is 6 cut points, and it is wound 9 layers;

[0071] After the first braided body is detached from the first mold, sleeved on the surface of the second mold, and then stitch-sewn along the normal phase surface of the first braided body with normal carbon fiber wire to obtain a second braided body;

[0072] Perform a secondary heat treatment on the second braided body sleeved on the surface of the second mold to obtain a third braided body;

[0073] The third braided body is impregnated in the third slurry. The third braided body is impregnated in the third slurry. The shape of the third braided body is maintained by sleeving a third mold on the surface of the third braided body, and then three heatings are carried out to obtain the wire-reinforced carbon fiber composite material; the first mold is a columnar structure; the second mold includes a support member with a plurality of pores, and the plurality of support members form a hollow columnar structure; the second mold is a hollow columnar structure provided with a plurality of pores.

[0074] Three heatings are carried out to obtain the wire-reinforced carbon fiber composite material.

[0075] The temperature of the first heating is 50°C; for the second heating process, it is heated from room temperature to 110°C at a heating rate of 9.5°C / min; the temperature is heated from 110°C to 700°C at a heating rate of 3.5°C / min;

[0076] For the third heating process, it is heated in an inert gas atmosphere, heated from room temperature to 240°C at a heating rate of 9°C / min, and heated at 240°C for 4 hours; heated from 240°C to 1350°C at a heating rate of 3.5°C / min.

[0077] Example 2:

[0078] The same content as in Example 1 will not be elaborated here; the different solutions from Example 1 in this example are as follows:

[0079] One aspect of this example provides a wire-reinforced carbon fiber composite material. The thickness of the wire-reinforced carbon fiber composite material is 2.8 mm, and the density is 2.05 g / cm 3 ; the porosity is 6%; the thermal conductivity is 9 W / mK; the wire-reinforced carbon fiber composite material has a drawing fracture load of 8060 N after oxidation at 1200°C for 0.5 hours and a drawing fracture load of 4920 N after oxidation at 1300°C for 2.5 hours; the non-fatigue fracture time at 1600°C is 130 hours.

[0080] The diameter of the wire is 0.3 mm, and the wire is a molybdenum lanthanum alloy wire; the volume ratio of the wire to the axial carbon fiber line is 50:50.

[0081] Another aspect of this example provides a method for preparing a wire-reinforced carbon fiber composite material, including the following steps:

[0082] The first slurry includes silicon powder, ethanol, and silica sol; for the preparation process of the first slurry, the silicon powder, ethanol, and silica sol are mixed in a mass ratio of 4:10:1.5;

[0083] The second slurry includes furan resin or phenolic resin and a solvent. The solvent includes ethanol or methanol. The viscosity of the second slurry is 75 mPa·s.

[0084] The mass ratio of the chopped silicon carbide fibers to the liquid polycarbosilane is 2.8:5. The aspect ratio of the chopped silicon carbide fibers is 1.7:1. The particle size of the silicon powder is 0.7 micrometers. The preparation method of the third slurry is as follows: impregnate the chopped silicon carbide fibers in the liquid polycarbosilane and then dry them at a drying temperature of 160°C, and then disperse them in pure water to obtain the third slurry.

[0085] The metal wire is a molybdenum lanthanum alloy wire with a diameter of 0.4 mm.

[0086] Intertwine the forming metal wire and the forming axial carbon fiber wire on the surface of the first mold, and then perform a first heating to form a first braided body on the surface of the first mold. The winding angle of the axial carbon fiber wire is 58°, and it is wound 10 layers.

[0087] After impregnating and drying the normal carbon fiber wire in the first slurry, then use the normal carbon fiber wire to stitch the first braided body by needling. The specific process is as follows:

[0088] After the first braided body is detached from the first mold, sleeve the first braided body on the surface of the second mold, and then use the impregnated and dried normal carbon fiber wire to stitch along the normal phase surface of the first braided body to obtain a second braided body.

[0089] Perform a secondary heat treatment on the second braided body sleeved on the surface of the second mold to obtain a third braided body.

[0090] Immerse the third braided body in the third slurry. By sleeving a third mold on the surface of the third braided body to maintain the shape of the third braided body, and then perform a third heating to obtain the metal wire reinforced carbon fiber composite material.

[0091] Perform a third heating to obtain the metal wire reinforced carbon fiber composite material.

[0092] The temperature of the first heating is 55°C. The secondary heating process is as follows: heat up from room temperature to 115°C at a heating rate of 9.8°C / min; heat up from 115°C to 750°C at a heating rate of 3.8°C / min.

[0093] The third heating process is as follows: heat in an inert gas atmosphere, heat up from room temperature to 260°C at a heating rate of 9.8°C / min, and heat at 260°C for 4.5 hours; heat from 260°C to 1380°C at a heating rate of 3.8°C / min.

[0094] Example 3:

[0095] The content that is the same as that in Embodiment 1 will not be elaborated here; the different solutions from Embodiment 1 are as follows:

[0096] One aspect of this embodiment provides a wire-reinforced carbon fiber composite material. The thickness of the wire-reinforced carbon fiber composite material is 2.6 mm, and the density is 1.95 g / cm 3 ; the porosity is 5.8%; the thermal conductivity is 8 W / mK; the wire-reinforced carbon fiber composite material has a drawing fracture load of 8030 N after oxidation at 1200 °C for 0.5 hour, and a drawing fracture load of 4910 N after oxidation at 1300 °C for 2.5 hours; the non-fatigue fracture time at 1600 °C is 140 hours.

[0097] The diameter of the wire is 0.2 - 0.5 mm, and the wire is a molybdenum lanthanum alloy wire; the volume ratio of the wire to the axial carbon fiber wire is (40 - 60):(60 - 40).

[0098] Another aspect provides a method for preparing a wire-reinforced carbon fiber composite material, including the following steps: The first slurry includes silicon powder, ethanol, and silica sol; the preparation process of the first slurry is to mix silicon powder, ethanol, and silica sol in a mass ratio of 3:10:1.2;

[0099] The second slurry includes furan resin or phenolic resin and a solvent. The solvent includes ethanol or methanol, and the viscosity of the second slurry is 65 mPa·s;

[0100] The mass ratio of the chopped silicon carbide fibers to the liquid polycarbosilane is 2.2:5; the aspect ratio of the chopped silicon carbide fibers is 1.55:1; the particle size of the silicon powder is 0.6 micrometers; the preparation method of the third slurry is to impregnate the chopped silicon carbide fibers in the liquid polycarbosilane and then dry them at a drying temperature of 130 °C, and then disperse them in pure water to obtain the third slurry.

[0101] Immerse the wire and the axial carbon fiber wire in the first slurry and the second slurry respectively, and then dry them to obtain a formed wire and a formed axial carbon fiber wire; the wire is a molybdenum lanthanum alloy wire, and the diameter of the molybdenum lanthanum alloy wire is 0.25 mm;

[0102] Intertwine the formed wire and the formed axial carbon fiber wire on the surface of the first mold, and then perform a first heating to form a first braided body on the surface of the first mold; the winding angle of the axial carbon fiber wire is 56°, the number of winding cut points is 7 cut points, and it is wound 9 layers;

[0103] The primary heating temperature is 45°C; the secondary heating process is to increase the temperature from room temperature to 105°C at a heating rate of 9.2°C / min; and then increase the temperature from 105°C to 650°C at a heating rate of 3.2°C / min.

[0104] The tertiary heating process is to heat in an inert gas atmosphere, increase the temperature from room temperature to 220°C at a heating rate of 8.5°C / min, hold at 220°C for 3.2 hours; and then increase the temperature from 220°C to 1320°C at a heating rate of 3.2°C / min.

[0105] The above description is only the preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features have similar functions to those disclosed in the present application (but not limited to).

Claims

1. A wire-reinforced carbon fiber composite material, characterized in that, including axial carbon fiber wires and metal wires arranged in a staggered manner; Mesh-shaped chopped silicon carbide fibers are arranged between the mesh pores where the axial carbon fiber lines and metal wires are interlaced; the intersections of the metal wires and the axial carbon fiber lines are coated with silicon carbide; The metal wire reinforced carbon fiber composite material is normally provided with normal carbon fiber wires; The intersection points of the normal carbon fiber lines and the metal wires include silicon carbide.

2. The metal wire reinforced carbon fiber composite material according to claim 1, characterized in that: The thickness of the wire-reinforced carbon fiber composite material is 2.5 to 5 mm, and the density is 1.9 to 2.2 g / cm 3 ; the porosity is 5 to 7%; the thermal conductivity is 6 to 10 W / mK; the wire-reinforced carbon fiber composite material has a drawing fracture load ≥ 7960 N after oxidation at 1200°C for 0.5 hours, and a drawing fracture load ≥ 4792 N after oxidation at 1300°C for 2.5 hours; the non-fatigue fracture time at 1600°C ≥ 100 hours.

3. The metal wire reinforced carbon fiber composite material according to claim 1, characterized in that: The diameter of the metal wire is 0.2-0.5 mm, and the metal wire is a molybdenum-lanthanum alloy wire; The volume ratio of the metal wire to the axial carbon fiber wire is (40-60): (60-40); and / or The intersection points of the normal carbon fiber lines and the axial carbon fiber lines include silicon carbide.

4. A preparation method of a wire-reinforced carbon fiber composite material, characterized in that The following steps are involved: preparing a first slurry, preparing a second slurry, and preparing a third slurry; The metal wire and the axial carbon fiber wire are immersed in the first slurry and the second slurry respectively, and then dried to obtain the metal wire for molding and the axial carbon fiber wire for molding; The forming metal wire and the forming axial carbon fiber wire are interlaced and wound on the surface of the first mold, and then heated once to form a first braided body on the surface of the first mold; After the first braid is separated from the first mold, a normal carbon fiber line is used to perform needle punching and sewing along the normal surface of the first braid to obtain a second braid; The second braid is subjected to a secondary heating treatment to obtain a third braid; The third braided body is immersed in the third slurry and heated three times to obtain the metal wire reinforced carbon fiber composite material.

5. The method for preparing a metal wire reinforced carbon fiber composite material according to claim 4, characterized in that: The first slurry includes silicon powder, ethanol, and silica sol; the first slurry preparation process is to mix silicon powder, ethanol, and silica sol in a mass ratio of (2-5):10:(1-2); The second slurry includes furan resin or phenolic resin and a solvent, the solvent includes ethanol or methanol, and the viscosity of the second slurry is 60 to 80 mPa·s; The third slurry includes chopped silicon carbide fibers and liquid polycarbosilane; the mass ratio of the chopped silicon carbide fibers to the liquid polycarbosilane is (2-3):

5.

6. The method for preparing a metal wire reinforced carbon fiber composite material according to claim 5, characterized in that: The third slurry is prepared by dipping the chopped silicon carbide fibers in liquid polycarbosilane and then drying them at a drying temperature of 100-180° C., and then dispersing them in pure water to obtain the third slurry.

7. The method for preparing a wire-reinforced carbon fiber composite material according to claim 4, wherein, Before the normal carbon fiber thread is needle-punched and sewn to the first braided body, the normal carbon fiber thread is immersed in the first slurry and dried.

8. The method for preparing a wire-reinforced carbon fiber composite material according to claim 4, wherein, The metal wire is a molybdenum-lanthanum alloy wire, and the diameter of the molybdenum-lanthanum alloy wire is 0.2-0.5 mm; The winding angle of the axial carbon fiber filaments is 55-60 degrees, the number of winding tangent points is 5-7 tangent points, and the winding is 8-10 layers.

9. The method for preparing a wire-reinforced carbon fiber composite material according to claim 4, characterized in that, After the first braid is separated from the first mold, the first braid is placed on the surface of the second mold, and then a normal carbon fiber line is used to perform needle punching and sewing along the normal surface of the first braid to obtain a second braid; The second braided body sleeved on the surface of the second mold is subjected to a secondary heating treatment to obtain a third braided body; The third braided body is immersed in a third slurry, a third mold is set on the surface of the third braided body to maintain the shape of the third braided body, and then heating is performed three times to obtain the metal wire reinforced carbon fiber composite material.

10. The preparation method of the wire-reinforced carbon fiber composite material according to claim 4, wherein the primary heating temperature is 40 - 60°C; The secondary heating process is as follows: heating from room temperature to 100 - 120°C at a heating rate of 9 - 10°C / min; heating from 100 - 120°C to 600 - 800°C at a heating rate of 3 - 4°C / min; The tertiary heating process is as follows: heating in an inert gas atmosphere, heating from room temperature to 200 - 280°C at a heating rate of 8 - 10°C / min, and heating at 200 - 280°C for 3 - 5 hours; heating from 200 - 280°C to 1300 - 1400°C at a heating rate of 3 - 4°C / min.