Carbon-ceramic preform, carbon-ceramic material, and preparation method and application of carbon-ceramic preform and carbon-ceramic material

Abstract

The invention provides a carbon-ceramic preform, a carbon-ceramic material and a preparation method and application of the carbon-ceramic preform and the carbon-ceramic material. The carbon ceramic prefabricated body comprises at least two carbon fiber layers and at least one resin slurry layer, the carbon fiber layers and the resin slurry layers are alternately stacked, and the resin slurry layers are provided with inorganic filler. According to the carbon-ceramic preform provided by the invention, the adjacent carbon fiber layers are connected through the resin slurry layer containing the inorganic filler, so that the internal combination reliability of the carbon-ceramic preform is improved, the structural continuity and integrity of the carbon fiber layers are ensured, and a carbon-ceramic material with excellent performance can be obtained.

Description

Technical Field

[0001] The present application relates to the field of materials, and in particular to a carbon ceramic preform, a carbon ceramic material, and a preparation method and application thereof. Background Art

[0002] Carbon ceramics are gaining attention due to their low density, high hardness, and fatigue resistance. Currently, carbon ceramics are typically produced by siliconizing needle-punched carbon fiber preforms or short fiber preforms. This production process is time-consuming and costly, and the integrity of the fibers is compromised, hindering their use and performance. Summary of the Invention

[0003] In view of this, the present application provides a carbon ceramic preform, a carbon ceramic material, and a preparation method and application thereof.

[0004] In a first aspect, the present application provides a carbon ceramic preform comprising at least two carbon fiber layers and at least one resin slurry layer, wherein the carbon fiber layers and the resin slurry layers are alternately stacked, and the resin slurry layers contain inorganic fillers.

[0005] Optionally, the particle size D50 of the inorganic filler is 0.5 μm-10 μm.

[0006] Optionally, the material of the inorganic filler includes at least one of silicon nitride, silicon carbide and silicon dioxide.

[0007] Optionally, the resin slurry layer further comprises a thermosetting resin and a curing agent.

[0008] Furthermore, in the resin slurry layer, the volume proportion of the thermosetting resin is 45%-52%, the volume proportion of the inorganic filler is 35%-40%, and the volume proportion of the curing agent is 2%-3%.

[0009] Optionally, the carbon fiber layer is a unidirectional cloth, and the carbon fiber layer has a plurality of carbon fiber bundles arranged in the same direction, and the extension directions of the carbon fiber bundles in adjacent carbon fiber layers have an acute angle.

[0010] Furthermore, the acute angle is 45°-90°.

[0011] Optionally, the surface density of the carbon fiber layer is 110 g / m 2 -800g / m 2 .

[0012] Optionally, the carbon fiber layer has a thickness of 0.3 mm to 0.8 mm.

[0013] Optionally, the thickness of the resin slurry layer is 0.2 mm-2 mm.

[0014] Optionally, the carbon ceramic preform has a thickness of 200 mm to 400 mm.

[0015] The carbon ceramic preform provided in the present application connects adjacent carbon fiber layers via a resin slurry layer containing an inorganic filler, thereby improving the bonding reliability within the carbon ceramic preform, ensuring the structural continuity and integrity of the carbon fiber layers, and facilitating the acquisition of a carbon ceramic material with excellent performance.

[0016] In a second aspect, the present application provides a method for preparing a carbon ceramic preform, comprising: providing at least two carbon fiber layers, coating resin slurry between adjacent fiber layers to form a resin slurry layer, and obtaining a carbon ceramic preform, wherein the resin slurry contains an inorganic filler.

[0017] The preparation method of the carbon ceramic preform provided in the present application is novel, has a simple preparation process, is convenient to operate, and is conducive to the preparation of carbon ceramic materials with excellent performance.

[0018] In a third aspect, the present application provides a carbon ceramic material comprising at least two carbon fiber composite layers and at least one connecting layer, wherein the carbon fiber composite layers and the connecting layers are alternately stacked, and the connecting layers are made of silicon carbide and silicon.

[0019] Optionally, the thickness of the connecting layer in the carbon ceramic material accounts for 40%-70%.

[0020] Optionally, the carbon fiber composite layer includes a carbon fiber layer and silicon carbide and silicon dispersed in the carbon fiber layer.

[0021] Optionally, the carbon fiber composite layer has a thickness of 0.1 mm to 0.8 mm.

[0022] Optionally, the thickness of the connecting layer is 0.1 mm-0.6 mm.

[0023] Optionally, the flexural strength of the carbon ceramic material is 80 MPa-230 MPa.

[0024] Optionally, the interlaminar shear strength of the carbon ceramic material is 7 MPa-22 MPa.

[0025] Optionally, the compressive strength of the carbon ceramic material is 180 MPa-400 MPa.

[0026] Optionally, the impact toughness of the carbon ceramic material is 15 kJ / m 2 -45kJ / m 2 .

[0027] The carbon ceramic material provided in this application has high structural reliability and excellent mechanical properties, which is conducive to the use of carbon ceramic materials.

[0028] In a fourth aspect, the present application provides a method for preparing a carbon ceramic material, comprising:

[0029] Providing at least two carbon fiber layers, coating resin slurry between adjacent fiber layers to form a resin slurry layer, and obtaining a carbon ceramic preform, wherein the resin slurry contains an inorganic filler;

[0030] The carbon ceramic preform is subjected to hot pressing curing treatment, carbonization treatment, carburizing treatment and siliconizing treatment to obtain the carbon ceramic material.

[0031] Optionally, the hot pressing curing treatment includes a first stage, a second stage and a third stage. The temperature of the first stage is 60℃-80℃, the time is 60min-80min, and the pressure is 0.1MPa-1MPa. The temperature of the second stage is 100℃-130℃, the time is 60min-80min, and the pressure is 1MPa-5MPa. The temperature of the third stage is 150℃-180℃, the time is 120min-180min, and the pressure is 1MPa-5MPa.

[0032] Optionally, the carbonization treatment is performed under an inert gas atmosphere, the temperature of the carbonization treatment is 1600° C.-2000° C., and the time is 120 min-240 min.

[0033] Optionally, the carburizing treatment adopts chemical vapor infiltration, using inert gas and carbon source gas, the flow rate of the inert gas is 5L / min-50L / min, the flow rate of the carbon source gas is 30L / min-80L / min, the temperature of the carburizing treatment is 800℃-1200℃, and the time is 200h-500h.

[0034] Optionally, the temperature of the siliconizing treatment is 1600° C.-1800° C., and the time is 120 min-480 min.

[0035] The preparation method of the carbon ceramic material provided in the present application is novel, has a simple preparation process, is easy to operate, and is conducive to the preparation of carbon ceramic materials with excellent performance.

[0036] In a fifth aspect, the present application provides a structural member, wherein the material of the structural member includes the carbon ceramic material described in the third aspect or the carbon ceramic material prepared by the preparation method described in the fourth aspect.

[0037] Optionally, the structural component includes a brake disc.

[0038] The material of the structural member of the present application includes carbon ceramic material, which is beneficial to improving the mechanical properties and service life of the carbon ceramic material.

[0039] In a sixth aspect, the present application provides a braking system, which includes the structural components described in the fifth aspect.

[0040] The braking system provided by the present application has excellent braking effect and good mechanical properties, which is conducive to the widespread use of the braking system.

[0041] In a seventh aspect, the present application provides a vehicle comprising the braking system described in the sixth aspect.

[0042] The vehicle provided by this application has excellent comprehensive performance, greatly improved safety performance, and strong product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] Figure 1 This is a schematic cross-sectional view of a carbon-ceramic preform provided in one embodiment of the present application.

[0045] Figure 2 This is a schematic cross-sectional view of a carbon ceramic material provided in one embodiment of the present application.

[0046] Figure 3 This is a flow chart of a method for preparing a carbon ceramic material according to one embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] In related art, carbon fiber layers are stacked and then needle-punched, followed by carburizing and siliconizing to produce carbon ceramic materials. However, the carbon fiber layers can only be connected by needle-punching, resulting in weak bonding strength. Needling also damages the integrity of the carbon fibers, affecting the performance of the carbon ceramic material. Furthermore, the resulting preform has low density and high porosity, resulting in a long carburizing time and high cost, significantly increasing the price of the carbon ceramic material. In related art, carbon fiber is also soaked in a resin solution, cured, and then sheared into short fibers. The short fibers are then thermally cracked and siliconized to produce carbon ceramic materials. However, the short fibers lack continuity and integrity, reducing the strength of the carbon ceramic material.

[0049] In view of this, the present application provides a carbon ceramic preform. Figure 1, is a schematic cross-sectional view of a carbon ceramic preform provided in one embodiment of the present application. The carbon ceramic preform 100 includes at least two carbon fiber layers 11 and at least one resin slurry layer 12. The carbon fiber layers 11 and the resin slurry layers 12 are alternately stacked, and the resin slurry layers 12 contain inorganic fillers. The carbon ceramic preform provided in the present application is not needle-punched, and the structure of the carbon fiber layers is not destroyed. This also avoids the use of short fibers, which is beneficial for improving the strength of the carbon ceramic material. At the same time, the resin slurry layer can connect adjacent carbon fiber layers, improving the internal bonding stability and reliability of the carbon ceramic preform, thereby improving the performance of the carbon ceramic material and avoiding multiple impregnation processes, making the preparation process simpler. In addition, the resin slurry layer containing inorganic fillers can increase the density of the carbon ceramic preform and reduce the porosity of the carbon ceramic preform, which is beneficial for reducing the time and cost of carbon ceramic material preparation.

[0050] The carbon fiber layer in this application ensures the performance of the carbon-ceramic preform and the carbon-ceramic material. The material of the carbon fiber can be selected as needed, such as at least one of polyacrylonitrile-based carbon fiber, viscose-based carbon fiber, and asphalt-based carbon fiber. In one embodiment of this application, the carbon fiber layer comprises multiple carbon fiber bundles. That is, the multiple carbon fiber bundles are arranged, woven, or otherwise formed into the carbon fiber layer. In one embodiment of this application, the carbon fiber bundles have a specification of 6K-24K, which helps improve the mechanical properties of the carbon-ceramic preform. That is, the carbon fiber bundles include 6,000 to 24,000 carbon fiber filaments. Specifically, the specifications of the carbon fiber bundles can be, but are not limited to, 6K, 10K, 12K, 14K, 18K, 20K, or 24K. In one embodiment, the specifications of the first carbon fiber bundles can be 6K-12K, which further improves the mechanical properties of the carbon-ceramic preform. In one embodiment of this application, the cross-sectional diameter of the first carbon fiber filaments is 4μm-8μm. Specifically, the cross-sectional diameter of the first carbon fiber filaments can be, but is not limited to, 4μm, 5μm, 6μm, 7μm, or 8μm.

[0051] In one embodiment of the present application, the carbon fiber layer comprises at least one of a unidirectional fabric and a two-dimensional fabric. In one embodiment of the present application, the carbon fiber layer comprises a plurality of carbon fiber bundles arranged in the same direction, in which case the carbon fiber layer is a unidirectional fabric. In another embodiment of the present application, in the carbon fiber layer, some of the carbon fiber bundles are arranged in a first direction, and some of the carbon fiber bundles are arranged in a second direction, and the first direction and the second direction are at an angle (i.e., the first direction and the second direction are not parallel), in which case the carbon fiber layer is a two-dimensional fabric. Specifically, the two-dimensional fabric may include, but is not limited to, at least one of a plain weave, a satin weave, and a twill weave.

[0052] The carbon fiber layers in the carbon-ceramic preform can be unidirectional or two-dimensional fabrics, and the selection of multiple carbon fiber layers can be the same or different. In one embodiment of the present application, the carbon fiber layers are unidirectional, and the extension directions of the carbon fiber bundles in adjacent carbon fiber layers are acutely angled. In other words, when adjacent carbon fiber layers in the carbon-ceramic preform are unidirectional, the extension directions of the carbon fiber bundles in the two layers of unidirectional fabric are different, which helps further improve the strength of the carbon-ceramic preform in different directions, thereby helping to further improve the mechanical properties of the carbon-ceramic preform and the carbon-ceramic material. In one embodiment of the present application, the acute angle is 45°-90°. Specifically, the acute angle can be, but is not limited to, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, or 90°. In one embodiment, the acute angle can be 90°, further improving the mechanical properties of the carbon-ceramic preform and the carbon-ceramic material. In a specific embodiment, the extension direction of the carbon fiber bundles in a carbon fiber layer in the carbon-ceramic preform is 0°, and the extension direction of the carbon fiber bundles in the carbon fiber layer adjacent to the carbon fiber layer is 90°.

[0053] In one embodiment of the present application, the surface density of the carbon fiber layer is 110 g / m 2 -800g / m 2 , which is beneficial to improving the mechanical properties of the carbon ceramic preform. Specifically, the surface density of the carbon fiber layer can be but is not limited to 110g / m 2 , 200g / m 2 , 300g / m 2 , 400g / m 2 , 500g / m 2 , 600g / m 2 , 700g / m 2 or 800g / m 2 wait.

[0054] In one embodiment of the present application, the thickness of the carbon fiber layer is 0.3 mm to 0.8 mm. This ensures the basic performance of the carbon-ceramic preform while facilitating the placement of the resin slurry layer, improving the bonding between the carbon fiber layers, and avoiding excessive increase in the thickness of the carbon-ceramic preform. Specifically, the thickness of the carbon fiber layer can be, but is not limited to, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0055] In this application, the resin slurry layer serves to connect adjacent carbon fiber layers, eliminating the need for needle punching or the use of short fibers in the carbon ceramic preform, thereby improving the performance of the carbon ceramic preform and the carbon ceramic material. The inorganic filler can adjust the viscosity and adhesion of the resin slurry layer, while also increasing its density. It can also infiltrate the carbon fiber layer during the hot pressing process, increasing its density and strength, thereby reducing carburizing time and manufacturing costs. In one embodiment of this application, the inorganic filler comprises silicon, thereby increasing the silicon content in the carbon ceramic material and further enhancing its performance. In one embodiment of this application, the inorganic filler comprises at least one of silicon nitride, silicon carbide, and silicon dioxide, further enhancing the performance of the carbon ceramic material. In one embodiment of this application, the inorganic filler has a particle size D50 of 0.5 μm to 10 μm, ensuring that it does not significantly affect the viscosity of the resin slurry layer while also facilitating its infiltration into the carbon fiber layer during the hot pressing process, improving the density of the carbon fiber layer and the performance of the carbon ceramic material. Specifically, the particle size D50 of the inorganic filler may be, but is not limited to, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm.

[0056] In one embodiment of the present application, the resin slurry layer also has a thermosetting resin and a curing agent. The thermosetting resin can be selected as needed. For example, the thermosetting resin can include at least one of a phenolic resin, a furan resin, and an asphalt resin. The curing agent corresponding to the thermosetting resin can be selected. For example, hexamethylenetetramine can be selected as a curing agent for the phenolic resin. In one embodiment of the present application, the volume proportion of the thermosetting resin in the resin slurry layer is 45%-52%, the volume proportion of the inorganic filler is 35%-40%, and the volume proportion of the curing agent is 2%-3%. This is beneficial for the resin slurry layer to penetrate into the carbon fiber during the hot pressing curing process and is also beneficial for the curing of the resin slurry layer. Specifically, the volume proportion of the thermosetting resin in the resin slurry layer can be but not limited to 45%, 46%, 47%, 48%, 49%, 50%, 51% or 52%, etc., the volume proportion of the inorganic filler in the resin slurry layer can be but not limited to 35%, 36%, 37%, 38%, 39% or 40%, etc., and the volume proportion of the curing agent in the resin slurry layer can be but not limited to 2%, 2.1%, 2.5%, 2.7%, 2.8% or 3%, etc.

[0057] In one embodiment of the present application, the thickness of the resin slurry layer is 0.2 mm to 2 mm, which not only ensures the connection between adjacent carbon fiber layers but also facilitates partial penetration into the carbon fiber layers during the hot pressing curing process, thereby improving the performance of the carbon ceramic material and ensuring the proportion of the carbon fiber layers in the carbon ceramic preform. Specifically, the thickness of the resin slurry layer can be, but is not limited to, 0.2 mm, 0.4 mm, 0.5 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.9 mm, or 2 mm.

[0058] The carbon ceramic preform of the present application may have at least two carbon fiber layers and at least one resin slurry layer. The specific number of layers can be selected as needed. For example, the carbon fiber layers in the carbon ceramic preform may have two layers, three layers, four layers, five layers, eight layers, ten layers, twelve layers, fifteen layers, seventeen layers, twenty layers, twenty-five layers, thirty layers, thirty-five layers, forty layers, etc.; the resin slurry layers in the carbon ceramic preform may have one layer, two layers, three layers, four layers, seven layers, nine layers, eleven layers, fourteen layers, sixteen layers, nineteen layers, twenty-four layers, twenty-nine layers, thirty-four layers, thirty-nine layers, etc. When the carbon ceramic preform of the present application has multiple layers of resin slurry layers, the materials and contents of the components in the multiple layers of resin slurry layers may be the same or different, and there is no limitation on this. In one embodiment of the present application, the thickness of the carbon ceramic preform is 200mm-400mm, which is conducive to the preparation of the carbon ceramic material, ensures the thickness of the carbon ceramic material, and facilitates the use of the carbon ceramic material. Specifically, the thickness of the carbon-ceramic preform may be, but is not limited to, 200 mm, 230 mm, 250 mm, 270 mm, 290 mm, 300 mm, 315 mm, 330 mm, 350 mm, 375 mm, 380 mm, or 400 mm. Specifically, the total number of carbon fiber layers and resin slurry layers in the carbon-ceramic preform is 30 to 80 layers.

[0059] The present application provides a method for preparing a carbon-ceramic preform, comprising: providing at least two carbon fiber layers; applying a resin slurry between adjacent fiber layers to form a resin slurry layer to obtain a carbon-ceramic preform; the resin slurry contains an inorganic filler. The method for preparing the carbon-ceramic preform provided in the present application is novel, has a simple preparation process, is convenient to operate, and produces a high-density carbon-ceramic preform, facilitating the preparation of high-performance carbon-ceramic materials.

[0060] In one embodiment of the present application, the viscosity of the resin slurry is between 10,000 cps and 30,000 cps. This facilitates coating and forming a resin slurry layer, while also facilitating penetration into the carbon fiber layer during subsequent hot pressing and curing, thereby improving the performance of the carbon ceramic material. Specifically, the viscosity of the resin slurry can be, but is not limited to, 10,000 cps, 1,500 cps, 20,000 cps, 25,000 cps, or 30,000 cps.

[0061] In one embodiment of the present application, the resin slurry includes a thermosetting resin, a curing agent, an inorganic filler, and a solvent. The curing agent is used to promote the curing of the thermosetting resin during the hot press curing process. The inorganic filler can improve the viscosity and coating properties of the resin slurry and increase the density of the resin slurry layer. It is also beneficial to increase the density of the hot press cured product and reduce its porosity during the preparation of carbon ceramic materials, thereby reducing carburizing time and preparation costs. The solvent is used to dissolve and disperse the various components and adjust the viscosity of the resin slurry, which facilitates the coating of the resin slurry. The solvent can be selected from substances that can dissolve and disperse the various components and do not react with them, specifically ethanol. In one embodiment of the present application, the volume proportion of the thermosetting resin in the resin slurry is 45%-52%, the volume proportion of the inorganic filler is 35%-40%, and the volume proportion of the curing agent is 2%-3%, which facilitates the coating of the resin slurry and the formation of the resin slurry layer. In another embodiment of the present application, the resin slurry also includes additives, such as a regulator and a dispersant. In one embodiment, the resin slurry may include a modifier, which may comprise 5% to 15% by volume, to further adjust the viscosity of the resin slurry. Specifically, the modifier may be, but is not limited to, polyvinyl butyral. In one embodiment, the resin slurry may include a dispersant, which may comprise 0.5% to 1% by volume, to further adjust the uniform dispersion of the components of the resin slurry.

[0062] See also Figure 2 , is a cross-sectional schematic diagram of a carbon ceramic material provided in one embodiment of the present application. The carbon ceramic material 200 includes at least two carbon fiber composite layers 21 and at least one connecting layer 22. The carbon fiber composite layers 21 and the connecting layers 22 are alternately stacked. The material of the connecting layer 22 includes silicon carbide and silicon.

[0063] See also Figure 3 , is a flow chart of a method for preparing a carbon ceramic material provided in one embodiment of the present application, comprising:

[0064] S101: providing at least two carbon fiber layers, coating resin slurry between adjacent fiber layers to form a resin slurry layer, and obtaining a carbon-ceramic preform, wherein the resin slurry contains an inorganic filler.

[0065] S102: The carbon ceramic preform is subjected to hot pressing curing treatment, carbonization treatment, carburizing treatment and siliconizing treatment to obtain a carbon ceramic material.

[0066] By coating resin slurry between adjacent carbon fiber layers, a resin slurry layer connecting the carbon fiber layers is formed; during the hot pressing curing process, the resin slurry layer is heated and its fluidity increases, and part of it penetrates into the carbon fiber layer, thereby increasing the density of the carbon fiber layer and reducing the porosity of the carbon fiber layer. After the resin is cured, part of it remains in the carbon fiber layer, and part of it is between the carbon fiber layers, still playing the role of connecting the carbon fiber layers. This greatly reduces the time of the carburizing process and greatly saves the preparation cost. After the carbonization process, the resin is completely carbonized, and silicon carbide can be formed during the siliconizing process, thereby improving the performance of the carbon ceramic material. Therefore, the carbon fiber layer and the part of the resin slurry that has penetrated into the carbon fiber layer are subjected to hot pressing curing, carburizing, carbonization and siliconizing to form a carbon fiber composite layer, while the resin slurry layer that has not penetrated into the carbon fiber layer and still remains between the carbon fiber fibers to play a connecting role is subjected to hot pressing curing, carbonization, carburizing and siliconizing to form a connecting layer made of silicon carbide and silicon. The carbon ceramic material prepared in the present application has excellent mechanical properties. Specifically, the carbon ceramic material has excellent bending strength, compressive strength, interlaminar shear strength and impact toughness, which is conducive to the use of the carbon ceramic material.

[0067] In one embodiment of the present application, the thickness of the connecting layer in the carbon ceramic material is 40%-70%, which is beneficial for further improving the mechanical properties of the carbon ceramic material. Specifically, the thickness of the connecting layer in the carbon ceramic material can be, but is not limited to, 40%, 45%, 50%, 55%, 60%, 65%, or 70%.

[0068] In one embodiment of the present application, the thickness of the connecting layer is 0.1 mm to 0.6 mm, which is beneficial for further improving the strength of the carbon ceramic material. Specifically, the thickness of the connecting layer can be, but is not limited to, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm.

[0069] In one embodiment of the present application, a carbon fiber composite layer includes a carbon fiber layer and silicon carbide and silicon dispersed within the carbon fiber layer. The silicon carbide and silicon within the carbon fiber composite layer improve the performance of the carbon fiber composite layer and the carbon ceramic material. Specifically, the carbon fiber layer includes a plurality of carbon fiber bundles, with the silicon carbide and silicon distributed on the surface of the carbon fiber bundles and between the carbon fiber bundles.

[0070] In one embodiment of the present application, the thickness of the carbon fiber composite layer is 0.1 mm to 0.8 mm, which helps further improve the strength of the carbon ceramic material. Specifically, the thickness of the carbon fiber composite layer can be, but is not limited to, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0071] In one embodiment of the present application, the flexural strength of the carbon ceramic material is 80 MPa-230 MPa. This application performs flexural strength testing in accordance with GB / T 6569. Specifically, the flexural strength of the carbon ceramic material may be, but is not limited to, 80 MPa, 90 MPa, 100 MPa, 110 MPa, 120 MPa, 130 MPa, 140 MPa, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, 200 MPa, 210 MPa, 220 MPa, or 230 MPa. In one embodiment of the present application, the flexural strength of the carbon ceramic material is 120 MPa-220 MPa.

[0072] In one embodiment of the present application, the interlaminar shear strength of the carbon ceramic material is 7 MPa-22 MPa. The present application performs interlaminar shear strength testing in accordance with ASTM D2344 / D2344M-13. Specifically, the interlaminar shear strength of the carbon ceramic material may be, but is not limited to, 7 MPa, 8 MPa, 9 MPa, 10 MPa, 11 MPa, 12 MPa, 13 MPa, 14 MPa, 15 MPa, 16 MPa, 17 MPa, 18 MPa, 19 MPa, 20 MPa, 21 MPa, or 22 MPa. In one embodiment of the present application, the interlaminar shear strength of the carbon ceramic material is 14.3 MPa-21 MPa.

[0073] In one embodiment of the present application, the compressive strength of the carbon ceramic material is 180 MPa-400 MPa. This application performs compressive strength testing in accordance with GB / T34559-2017. Specifically, the compressive strength of the carbon ceramic material can be, but is not limited to, 180 MPa, 200 MPa, 210 MPa, 220 MPa, 240 MPa, 250 MPa, 270 MPa, 280 MPa, 300 MPa, 310 MPa, 320 MPa, 330 MPa, 350 MPa, 360 MPa, 380 MPa, or 400 MPa. In one embodiment of the present application, the compressive strength of the carbon ceramic material is 240 MPa-400 MPa.

[0074] In one embodiment of the present application, the impact toughness of the carbon ceramic material is 15 kJ / m 2 -45kJ / m 2 This application is based on GB / T14389-1993 to test the impact toughness. Specifically, the impact toughness of carbon ceramic materials can be but is not limited to 15kJ / m 2 、16kJ / m 2 、18kJ / m 2 、19kJ / m 2 , 20kJ / m 2 , 22kJ / m 2 , 23kJ / m 2, 25kJ / m 2 , 28kJ / m 2 , 29kJ / m 2 、30kJ / m 2 、31kJ / m 2 、33kJ / m 2 、35kJ / m 2 、36kJ / m 2 、38kJ / m 2 40kJ / m 2 42kJ / m 2 43kJ / m 2 or 45 kJ / m 2 In one embodiment of the present application, the impact toughness of the carbon ceramic material is 23 kJ / m 2 -35kJ / m 2 .

[0075] In one embodiment of the present application, the porosity of the carbon ceramic material is less than or equal to 10%. This application tests the porosity of carbon ceramic materials according to GB / T 1966. Specifically, the porosity of the carbon ceramic material can be, but is not limited to, less than 9%, less than 8%, less than 7%, less than 6%, or less than 5%.

[0076] In the present application, the hot press curing process is used to partially infiltrate the resin slurry layer into the carbon fiber layer and cure the resin slurry layer. In one embodiment of the present application, the hot press curing process includes a first stage, a second stage, and a third stage. The first stage is performed at a temperature of 60°C to 80°C, a time of 60 minutes to 80 minutes, and a pressure of 0.1 MPa to 1 MPa. The second stage is performed at a temperature of 100°C to 130°C, a time of 60 minutes to 80 minutes, and a pressure of 1 MPa to 5 MPa. The third stage is performed at a temperature of 150°C to 180°C, a time of 120 minutes to 180 minutes, and a pressure of 1 MPa to 5 MPa. Among them, the first stage is carried out at a relatively low temperature, so that the resin slurry layer does not solidify, and the fluidity is increased, which is conducive to its penetration into the carbon fiber layer; the temperature in the second stage is increased and the pressure is increased, which is conducive to the penetration of part of the resin slurry layer into the carbon fiber layer, which can not only play the role of connecting the carbon fiber layer, but also increase the density of the carbon fiber layer and reduce the porosity of the carbon fiber layer, which is conducive to the carburizing treatment, and also can prevent the resin slurry layer from overflowing the carbon ceramic preform; the temperature in the third stage is increased to ensure complete solidification. Specifically, the temperature of the first stage can be but not limited to 60℃, 65℃, 70℃, 75℃ or 80℃, etc., the time can be but not limited to 60min, 65min, 70min, 75min or 80min, etc., and the pressure can be but not limited to 0.1MPa, 0.3MPa, 0.5MPa, 0.8MPa or 1MPa, etc.; the temperature of the second stage can be but not limited to 100℃, 110℃, 120℃ or 130℃, etc., and the time can be but not limited to 60min, 65min, 70 min, 75min or 80min, etc., and the pressure may be but not limited to 1MPa, 2MPa, 3MPa, 4MPa or 5MPa, etc.; the temperature of the third stage may be but not limited to 150°C, 160°C, 170°C or 180°C, etc., the time may be but not limited to 120min, 130min, 140min, 150min, 160min, 170min or 180min, etc., and the pressure may be but not limited to 1MPa, 2MPa, 3MPa, 4MPa or 5MPa, etc.

[0077] The carbonization treatment in the present application ensures that the resin is completely carbonized and graphitized after curing, and is also beneficial to the carburizing treatment and the performance of the carbon ceramic material. In one embodiment of the present application, the carbonization treatment is carried out in an inert gas (such as argon) atmosphere, the temperature of the carbonization treatment is 1600°C-2000°C, and the time is 120min-240min, which is beneficial to further increase the carbon content of the carbon ceramic preform and is beneficial to the subsequent siliconization. Specifically, the temperature of the carbonization treatment can be but not limited to 1600°C, 1700°C, 1800°C, 1900°C or 2000°C, and the time of the carbonization treatment can be but not limited to 120min, 130min, 150min, 180min, 190min, 200min, 210min, 220min, 230min or 240min, etc.

[0078] In the present application, the carburizing treatment is used to carburize the carbon ceramic preform after hot pressing and curing, thereby increasing the density and reducing the porosity, which is beneficial to improving the performance of the carbon ceramic material. In one embodiment of the present application, the carburizing treatment adopts chemical vapor infiltration, using an inert gas (such as nitrogen, etc.) and a carbon source gas (such as methane, etc.), the flow rate of the inert gas is 5L / min-50L / min, the flow rate of the carbon source gas is 30L / min-80L / min, the temperature of the carburizing treatment is 800℃-1200℃, and the time is 200h-500h. In the present application, since part of the resin slurry is infiltrated into the carbon fiber layer during hot pressing and curing, the processing time can be reduced in the carburizing treatment, the preparation cost can be reduced, and it is beneficial to the use of carbon ceramic materials. Specifically, the flow rate of the inert gas can be but is not limited to 10 L / min, 15 L / min, 20 L / min, 30 L / min, 35 L / min, 40 L / min or 50 L / min, etc., the flow rate of the carbon source gas can be but is not limited to 30 L / min, 40 L / min, 50 L / min, 60 L / min, 70 L / min or 80 L / min, etc., the temperature of the carburizing treatment can be but is not limited to 850°C, 900°C, 1000°C, 1100°C or 1200°C, etc., and the time of the carburizing treatment can be but is not limited to 200h, 300h, 400h or 500h, etc.

[0079] In the present application, silicon carbide is produced through siliconizing treatment to improve the mechanical properties and oxidation resistance of carbon ceramic materials. In one embodiment of the present application, the temperature of the siliconizing treatment is 1600°C-1800°C and the time is 120min-480min, which is conducive to the reaction between silicon and carbon elements to form silicon carbide, thereby improving the performance of the obtained carbon ceramic material. Specifically, the temperature of the siliconizing treatment can be, but is not limited to, 1600°C, 1650°C, 1700°C, 1750°C or 1800°C, and the time of the siliconizing treatment can be, but is not limited to, 120min, 180min, 240min, 360min or 480min.

[0080] In one embodiment of the present application, processing can be performed after the hot pressing and curing treatment and / or the siliconizing treatment. Through processing, the carbon ceramic preform after the hot pressing and curing treatment and / or the carbon ceramic material after the siliconizing treatment can meet the requirements of the use size, shape, etc., which is more conducive to the use of the carbon ceramic material.

[0081] This application also provides a structural component, wherein the material of the structural component includes the carbon ceramic material described in any of the above-mentioned embodiments, or includes the carbon ceramic material produced in any of the above-mentioned embodiments. The structural component provided by this application is lightweight, high-strength, and has excellent mechanical properties, which facilitates its use. This application does not limit the type, composition, or application of the structural component.

[0082] In one embodiment of the present application, the structural member includes a brake disc. The brake disc made from the carbon ceramic material provided by the present application has low preparation cost, good mechanical properties, and long service life. In one embodiment of the present application, the brake disc is an aircraft brake disc. That is, carbon fiber material can be used as the material of an aircraft brake disc. In another embodiment of the present application, the brake disc is a vehicle brake disc. That is, carbon fiber material can be used as the material of a vehicle brake disc. In a specific embodiment, when the carbon ceramic material is used as a vehicle brake disc, it can be used as a front brake disc or a rear brake disc of a vehicle; the thickness of the front brake disc of a vehicle can be 32mm-36mm, and the thickness of the rear brake disc of a vehicle can be 22mm-26mm.

[0083] The present application also provides a brake system, which includes the structural member of any of the above-mentioned embodiments, which is conducive to improving the performance of the brake system. In one embodiment of the present application, the structural member includes a brake disc, and the brake system may further include a brake caliper bracket, a brake front housing, and a friction pad.

[0084] The present application also provides a vehicle, comprising a braking system according to any one of the above embodiments, which is conducive to improving the market competitiveness of the vehicle. Specifically, the vehicle can be, but is not limited to, an airplane, a car, etc.

[0085] The effects of the technical solution of this application are further illustrated below through specific examples.

[0086] Example 1

[0087] Phenolic resin, inorganic fillers (silicon carbide and silicon dioxide), curing agent (hexamethylenetetramine), additive (polyvinyl butyral) and ethanol are mixed to form a resin slurry. The volume proportions of phenolic resin, inorganic filler, curing agent, additive and ethanol in the resin slurry are 45 parts, 40 parts, 2 parts, 13 parts and 9 parts, respectively.

[0088] The 12K carbon fiber bundles are woven into a surface density of 360g / m 2 A unidirectional fabric (0.3 mm thick) is prepared by coating the first layer of unidirectional fabric with resin slurry to form a first resin slurry layer (0.3 mm thick). A second layer of unidirectional fabric is disposed on the side of the resin slurry layer facing away from the unidirectional fabric. A second resin slurry layer is disposed on the side of the second layer of unidirectional fabric facing away from the first resin slurry layer. The above operation is repeated to obtain a carbon-ceramic preform having a total of sixty layers of unidirectional fabric and resin slurry layers, wherein the angle between the carbon fiber bundles in adjacent unidirectional fabrics is 90°.

[0089] The carbon ceramic preform is subjected to hot pressing curing treatment, including a first stage of treatment at 85° C. and 0.2 MPa for 60 min, a second stage of treatment at 130° C. and 1 MPa for 60 min, and a third stage of treatment at 170° C. and 1.5 MPa for 120 min; a first preform is obtained after the hot pressing curing treatment.

[0090] The first preform was carbonized at a heating rate of 3°C / min to 1700°C and kept at this temperature for 2 hours to obtain a second preform.

[0091] The second preform was carburized by chemical vapor infiltration, with nitrogen (flow rate of 5 L / min) and methane (flow rate of 60 L / min) introduced at 1060° C. for 280 h to obtain a third preform.

[0092] The third preform was siliconized, including maintaining the temperature at 1720°C for 3 hours, to obtain a carbon ceramic material. The carbon ceramic material includes multiple carbon fiber composite layers and multiple connecting layers, which are alternately stacked. The carbon fiber composite layers include carbon fiber layers and silicon carbide and silicon dispersed within the carbon fiber layers. The connecting layers are made of silicon carbide and silicon. The thickness of the carbon fiber composite layers is 0.26 mm, and the thickness of the connecting layers is 0.34 mm. The thickness of the connecting layers accounts for 56.7% of the carbon ceramic material.

[0093] Example 2

[0094] Furan resin, inorganic fillers (silicon carbide and silicon nitride), curing agent (phosphoric acid), additive (polyvinyl butyral) and ethanol are mixed to form a resin slurry. The volume proportions of phenolic resin, inorganic filler, curing agent, additive and ethanol in the resin slurry are 48 parts, 36 parts, 2 parts, 14 parts and 3 parts, respectively.

[0095] The 24K carbon fiber bundles are woven into a surface density of 600g / m 2 A unidirectional fabric (0.6 mm thick) was prepared. Resin slurry was applied to the first layer of unidirectional fabric to form a first resin slurry layer (0.4 mm thick). A second layer of unidirectional fabric was placed on the side of the resin slurry layer facing away from the unidirectional fabric. A second resin slurry layer was placed on the side of the second layer of unidirectional fabric facing away from the first resin slurry layer. The above operation was repeated to obtain a carbon-ceramic preform having a total of thirty-five layers of unidirectional fabric and resin slurry layers, wherein the angle between the carbon fiber bundles in adjacent unidirectional fabrics was 90°.

[0096] The carbon ceramic preform is subjected to hot pressing curing treatment, including a first stage of 80° C., 0.5 MPa treatment for 120 min, a second stage of 120° C., 1.5 MPa treatment for 120 min, and a third stage of 150° C., 1.5 MPa treatment for 60 min; and a first preform is obtained after the hot pressing curing treatment.

[0097] The first preform was carbonized at a heating rate of 3°C / min to 1700°C and kept at this temperature for 2 hours to obtain a second preform.

[0098] The second preform was carburized by chemical vapor infiltration, with nitrogen (flow rate of 5 L / min) and methane (flow rate of 50 L / min) introduced at 1080° C. for 300 h to obtain a third preform.

[0099] The third preform was siliconized, including maintaining the temperature at 1750°C for 3 hours, to obtain a carbon ceramic material. The carbon ceramic material comprises multiple carbon fiber composite layers and multiple connecting layers, which are alternately stacked. The carbon fiber composite layers include carbon fiber layers and silicon carbide and silicon dispersed within the carbon fiber layers. The connecting layers are made of silicon carbide and silicon. The thickness of the carbon fiber composite layers is 0.52 mm, and the thickness of the connecting layers is 0.44 mm. The thickness of the connecting layers accounts for 45.8% of the carbon ceramic material.

[0100] Example 3

[0101] Phenolic resin, inorganic filler (silicon carbide), curing agent (hexamethylenetetramine), auxiliary agent (polyvinyl butyral) and ethanol are mixed to form a resin slurry, in which the volume proportions of phenolic resin, inorganic filler, curing agent, auxiliary agent and ethanol in the resin slurry are 51 parts, 38 parts, 3 parts, 8 parts and 10 parts, respectively.

[0102] The 6K carbon fiber bundles are woven into a surface density of 220g / m 2 A unidirectional fabric (0.18 mm thick) was prepared. Resin slurry was applied to the first layer of unidirectional fabric to form a first resin slurry layer (0.3 mm thick). A second layer of unidirectional fabric was placed on the side of the resin slurry layer facing away from the unidirectional fabric. A third resin slurry layer was placed on the side of the second layer of unidirectional fabric facing away from the first resin slurry layer. The above operation was repeated to obtain a carbon-ceramic preform having a total of seventy layers of unidirectional fabric and resin slurry layers, wherein the angle between the carbon fiber bundles in adjacent unidirectional fabrics was 90°.

[0103] The carbon ceramic preform is subjected to hot pressing curing treatment, including a first stage of 80° C., 0.1 MPa treatment for 120 min, a second stage of 120° C., 1 MPa treatment for 120 min, and a third stage of 150° C., 1 MPa treatment for 60 min; and a first preform is obtained after the hot pressing curing treatment.

[0104] The first preform was carbonized at a heating rate of 3°C / min to 1700°C and kept at this temperature for 2 hours to obtain a second preform.

[0105] The second preform was carburized by chemical vapor infiltration, with nitrogen (flow rate of 5 L / min) and methane (flow rate of 60 L / min) introduced at 1060° C. for 320 h to obtain a third preform.

[0106] The third preform was siliconized, including holding at 1750°C for 3 hours, to produce a carbon ceramic material. The carbon ceramic material comprises multiple carbon fiber composite layers and multiple connecting layers, which are alternately stacked. The carbon fiber composite layers comprise carbon fiber layers and silicon carbide and silicon dispersed within the carbon fiber layers. The connecting layers are made of silicon carbide and silicon. The thickness of the carbon fiber composite layers is 0.16 mm, and the thickness of the connecting layers is 0.33 mm. The thickness of the connecting layers accounts for 67.3% of the carbon ceramic material.

[0107] Example 4

[0108] Phenolic resin, inorganic filler (silicon carbide), curing agent (hexamethylenetetramine), auxiliary agent (polyvinyl butyral) and ethanol are mixed to form a resin slurry, in which the volume proportions of phenolic resin, inorganic filler, curing agent, auxiliary agent and ethanol in the resin slurry are 46.5 parts, 40 parts, 3 parts, 9.5 parts and 10 parts, respectively.

[0109] The 12K carbon fiber bundles are woven into a surface density of 360g / m 2A unidirectional fabric (0.3 mm thick) is prepared by coating resin slurry on the first layer of unidirectional fabric to form a first resin slurry layer (0.1 mm thick). A second layer of unidirectional fabric is disposed on the side of the resin slurry layer facing away from the unidirectional fabric. A second resin slurry layer is disposed on the side of the second layer of unidirectional fabric facing away from the first resin slurry layer. The above operation is repeated to obtain a carbon-ceramic preform having a total of eighty layers of unidirectional fabric and resin slurry layers, wherein the angle between carbon fiber bundles in adjacent unidirectional fabrics is 90°.

[0110] The carbon ceramic preform is subjected to hot pressing curing treatment, including a first stage of treatment at 85° C. and 0.2 MPa for 60 min, a second stage of treatment at 130° C. and 1 MPa for 60 min, and a third stage of treatment at 170° C. and 1.5 MPa for 120 min; a first preform is obtained after the hot pressing curing treatment.

[0111] The first preform was carbonized at a heating rate of 3°C / min to 1700°C and kept at this temperature for 2 hours to obtain a second preform.

[0112] The second preform was carburized by chemical vapor infiltration, with nitrogen (flow rate of 5 L / min) and methane (flow rate of 60 L / min) introduced at 1060° C. for 300 h to obtain a third preform.

[0113] The third preform was siliconized, including maintaining the temperature at 1720°C for 3 hours, to obtain a carbon ceramic material. The carbon ceramic material includes multiple carbon fiber composite layers and multiple connecting layers, which are alternately stacked. The carbon fiber composite layers include carbon fiber layers and silicon carbide and silicon dispersed within the carbon fiber layers. The connecting layers are made of silicon carbide and silicon. The thickness of the carbon fiber composite layers is 0.26 mm, and the thickness of the connecting layers is 0.15 mm. The thickness of the connecting layers accounts for 36.6% of the carbon ceramic material.

[0114] Example 5

[0115] Phenolic resin, inorganic fillers (silicon carbide and silicon oxide), curing agent (hexamethylenetetramine), auxiliary agent (polyvinyl butyral) and ethanol are mixed to form a resin slurry. The volume proportions of phenolic resin, inorganic filler, curing agent, auxiliary agent and ethanol in the resin slurry are 50 parts, 40 parts, 3 parts, 7 parts and 10 parts respectively.

[0116] The 6K carbon fiber bundles are woven into a surface density of 220g / m 2A unidirectional fabric (0.18 mm thick) was prepared. Resin slurry was applied to the first layer of unidirectional fabric to form a first resin slurry layer (0.6 mm thick). A second layer of unidirectional fabric was placed on the side of the resin slurry layer facing away from the unidirectional fabric. A second resin slurry layer was placed on the side of the second layer of unidirectional fabric facing away from the first resin slurry layer. The above operation was repeated to obtain a carbon-ceramic preform having a total of 45 unidirectional fabric and resin slurry layers, wherein the angle between the carbon fiber bundles in adjacent unidirectional fabrics was 90°.

[0117] The carbon ceramic preform is subjected to hot pressing curing treatment, including a first stage of 80° C., 0.5 MPa treatment for 120 min, a second stage of 120° C., 1.5 MPa treatment for 120 min, and a third stage of 150° C., 1.5 MPa treatment for 60 min; and a first preform is obtained after the hot pressing curing treatment.

[0118] The first preform was carbonized at a heating rate of 3°C / min to 1700°C and kept at this temperature for 2 hours to obtain a second preform.

[0119] The second preform was carburized by chemical vapor infiltration, with nitrogen (flow rate of 5 L / min) and methane (flow rate of 50 L / min) introduced at 1080° C. for 320 h to obtain a third preform.

[0120] The third preform was siliconized, including maintaining the temperature at 1750°C for 3 hours, to obtain a carbon ceramic material. The carbon ceramic material comprises multiple carbon fiber composite layers and multiple connecting layers, which are alternately stacked. The carbon fiber composite layers include carbon fiber layers and silicon carbide and silicon dispersed within the carbon fiber layers. The connecting layers are made of silicon carbide and silicon. The thickness of the carbon fiber composite layers is 0.17 mm, and the thickness of the connecting layers is 0.65 mm. The thickness of the connecting layers accounts for 79.3% of the carbon ceramic material.

[0121] Comparative Example 1

[0122] The 12K carbon fiber bundles are woven into a surface density of 360g / m 2 Carbon fiber cloth is needle-punched to form a three-dimensional preform. Carbon is deposited inside the preform for 200 hours using chemical vapor deposition. After removing the surface carbon layer, carbon is deposited again using chemical vapor deposition for 300 hours. This is followed by siliconization (1720°C for 3 hours) to produce the carbon ceramic material.

[0123] Comparative Example 2

[0124] The 12K carbon fiber bundles are woven into a surface density of 360g / m 2The carbon fiber cloth is cut into fine fiber segments of a certain length (length is 0.1mm-1mm), then mixed with phenolic resin and hot-pressed in a mold. After carbonization at 900℃, it is siliconized (maintained at 1720℃ for 3h) to obtain carbon ceramic material.

[0125] Comparative Example 3

[0126] The process is substantially the same as Example 1, except that the resin slurry does not contain inorganic filler.

[0127] Performance testing

[0128] The carbon ceramic materials obtained in Examples 1-5 and Comparative Examples 1-3 were processed into structural parts (brake discs). The flexural strength of the structural parts was tested according to GB / T6569, the interlaminar shear strength of the structural parts was tested according to ASTM D2344 / D2344M-13, the compressive strength of the structural parts was tested according to GB / T 34559-2017, and the impact toughness of the structural parts was tested according to GB / T 14389-1993. The results are shown in Table 1.

[0129] Table 1 Performance test results

[0130]

[0131] It can be seen that the structural member prepared in Comparative Example 1 relies on needle punching for connection, which will destroy the integrity of the carbon fiber. The continuity and integrity of the fiber segments in the structural member prepared in Comparative Example 2 are poor. Comparative Example 3 does not contain inorganic fillers, and thus cannot effectively improve the mechanical properties of the structural member. However, the preparation method provided in the examples of the present application does not require needle punching, the carbon fiber layer is not destroyed, and no short fiber segments are used. In addition, it contains inorganic fillers, thereby being able to prepare structural members with excellent mechanical properties. Compared with Examples 4-5, the thickness ratio of the connecting layer in the carbon ceramic material in Examples 1-3 is more appropriate, which can further improve the mechanical properties of the structural member and is more conducive to the use of the structural member.

[0132] The above is an exemplary embodiment of the present application and should not be construed as limiting the scope of the present application. It should be noted that those skilled in the art may make improvements and modifications without departing from the principles of the present application, and such improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A carbon ceramic preform, characterized in that: The invention comprises at least two carbon fiber layers and at least one resin slurry layer, wherein the carbon fiber layers and the resin slurry layers are alternately stacked, and the resin slurry layer contains inorganic fillers.

2. The carbon ceramic preform according to claim 1, wherein: The particle size D50 of the inorganic filler is 0.5 μm-10 μm; The material of the inorganic filler includes at least one of silicon nitride, silicon carbide and silicon dioxide.

3. The carbon ceramic preform according to claim 1, wherein: The resin slurry layer also has a thermosetting resin and a curing agent; In the resin slurry layer, the volume proportion of the thermosetting resin is 45%-52%, the volume proportion of the inorganic filler is 35%-40%, and the volume proportion of the curing agent is 2%-3%.

4. The carbon ceramic preform according to claim 1, wherein: The carbon fiber layer is a unidirectional fabric, and the carbon fiber layer has a plurality of carbon fiber bundles arranged in the same direction, and the extension directions of the carbon fiber bundles in adjacent carbon fiber layers have an acute angle; The acute angle is 45°-90°.

5. The carbon ceramic preform according to claim 1, wherein: The surface density of the carbon fiber layer is 110 g / m 2 -800g / m 2 ; The thickness of the carbon fiber layer is 0.3mm-0.8mm; The thickness of the resin slurry layer is 0.2mm-2mm; The thickness of the carbon ceramic preform is 200 mm to 400 mm.

6. A method for preparing a carbon ceramic preform, characterized in that: include: At least two carbon fiber layers are provided, and resin slurry is coated between adjacent fiber layers to form a resin slurry layer to obtain a carbon ceramic preform, wherein the resin slurry contains an inorganic filler.

7. A carbon ceramic material, characterized in that: The invention comprises at least two carbon fiber composite layers and at least one connecting layer, wherein the carbon fiber composite layers and the connecting layers are alternately stacked, and the connecting layers are made of silicon carbide and silicon.

8. The carbon ceramic material according to claim 7, wherein: The thickness of the connecting layer in the carbon ceramic material accounts for 40%-70%.

9. The carbon ceramic material according to claim 7, wherein: The carbon fiber composite layer includes a carbon fiber layer and silicon carbide and silicon dispersed in the carbon fiber layer.

10. The carbon ceramic material according to claim 7, wherein: The thickness of the carbon fiber composite layer is 0.1mm-0.8mm; The thickness of the connecting layer is 0.1 mm to 0.6 mm.

11. The carbon ceramic material according to claim 7, wherein: The flexural strength of the carbon ceramic material is 80MPa-230MPa; The interlaminar shear strength of the carbon ceramic material is 7MPa-22MPa; The compressive strength of the carbon ceramic material is 180MPa-400MPa; The impact toughness of the carbon ceramic material is 15 kJ / m 2 -45kJ / m 2 .

12. A method for preparing a carbon ceramic material, characterized in that: include: Providing at least two carbon fiber layers, coating resin slurry between adjacent fiber layers to form a resin slurry layer, and obtaining a carbon ceramic preform, wherein the resin slurry contains an inorganic filler; The carbon ceramic preform is subjected to hot pressing curing treatment, carbonization treatment, carburizing treatment and siliconizing treatment to obtain the carbon ceramic material.

13. The preparation method according to claim 12, wherein The hot pressing curing process includes a first stage, a second stage and a third stage. The temperature of the first stage is 60°C-80°C, the time is 60min-80min, and the pressure is 0.1MPa-1MPa. The temperature of the second stage is 100°C-130°C, the time is 60min-80min, and the pressure is 1MPa-5MPa. The temperature of the third stage is 150°C-180°C, the time is 120min-180min, and the pressure is 1MPa-5MPa.

14. The preparation method according to claim 12, wherein The carbonization treatment is carried out in an inert gas atmosphere at a temperature of 1600° C. to 2000° C. and for a time of 120 min to 240 min.

15. The preparation method according to claim 12, wherein The carburizing treatment adopts chemical vapor infiltration method, using inert gas and carbon source gas, the flow rate of the inert gas is 5L / min-50L / min, the flow rate of the carbon source gas is 30L / min-80L / min, the temperature of the carburizing treatment is 800℃-1200℃, and the time is 200h-500h.

16. The preparation method according to claim 12, wherein The temperature of the siliconizing treatment is 1600° C.-1800° C., and the time is 120 min-480 min.

17. A structural member, characterized in that: The material of the structural member includes the carbon ceramic material according to any one of claims 7 to 11 or the carbon ceramic material prepared by the preparation method according to any one of claims 12 to 16.

18. The structural member according to claim 17, wherein: The structural member includes a brake disc.

19. A braking system, characterized in that: The braking system comprises the structural component according to any one of claims 17-18.

20. A means of transport, characterized in that: The vehicle includes the braking system of claim 19.

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