Preparation method of carbon-ceramic brake disc

Abstract

The invention discloses a preparation method of a carbon-ceramic brake disc, and relates to the technical field of automobile braking. Comprising the following steps that carbon fibers are woven to form carbon fiber woven cloth; carbon powder, ceramic powder, liquid resin and alcohol are mixed in proportion to form flowing slurry, and the surface of the carbon fiber woven cloth is evenly covered with the slurry in a spraying mode; drying the carbon fiber woven cloth subjected to slurry spraying through a drying oven, and removing a solvent on the surface of the carbon fiber woven cloth slurry; stacking the dried carbon fiber woven cloth in a layering and stacking manner, and heating, pressurizing, curing and forming in a hot press; then carrying out carbonization treatment; then surface punching treatment is conducted, meanwhile, carbon fiber filaments are made into carbon rods in the mode that the surfaces of the carbon fiber filaments are brushed with resin, and the manufactured carbon fiber filament carbon rods are used for conducting pin treatment on the carbonized punched product; carrying out dipping carbonization treatment on the product subjected to pin treatment; and the impregnated and carbonized product is subjected to machining treatment and then siliconizing.

Description

Technical Field

[0001] The invention relates to the technical field of automobile braking, and in particular to a method for preparing a carbon-ceramic brake disc. Background Art

[0002] With the growing demand for high-performance brake materials in modern transportation and various mechanical brake systems, the research and development and improvement of brake materials have become the focus of attention in related fields. Carbon ceramic brake materials, as a new high-performance brake material developed in the brake material field in recent years after powder metallurgy materials and C / C composite materials, have attracted much attention due to their many excellent properties.

[0003] Specifically, carbon ceramic brake materials have significant advantages such as low density, high strength, high hardness, impact resistance, high temperature resistance, oxidation resistance and low thermal expansion coefficient, and also have good toughness, ductility and thermal conductivity. These characteristics make carbon ceramic brake discs, as a new generation of high-performance friction materials in the braking field, able to show excellent braking performance in many application scenarios, and thus are widely used in automobiles, aerospace, high-speed trains and other fields with strict requirements on braking performance.

[0004] However, judging from the current status of the preparation technology of carbon-ceramic brake discs, there are still some technical defects that need to be resolved. In the existing main production process, carbon fiber unidirectional cloth is first laid, and then a relay needling method is used to produce a 2.5D needle-punched preform. During the production process of this preform, the relay needling method will cause large-scale damage to the long fibers inside the preform, causing the long fibers to break, which will have a negative impact on the mechanical properties of the product. Moreover, this needling method will also cause discontinuity of the Z-direction fibers inside the preform, resulting in poor shear performance of the product. In practical applications, especially when used under high-energy load conditions, there are greater safety risks, which seriously restricts the reliable application of carbon-ceramic brake discs in high-performance braking scenarios.

[0005] In addition, after the preform is made, chemical vapor deposition is usually used to increase the density of the material. However, since the initial density of the preform is relatively low, and the density required to achieve the embryo that meets the use requirements is high, when chemical vapor deposition is used, it often takes a long deposition cycle to achieve density improvement. This process directly leads to the overall production cycle of the product being lengthened, and is also accompanied by higher production costs, which is not conducive to the large-scale production of carbon ceramic brake discs and their wider market promotion and application.

[0006] In summary, the existing production process of carbon-ceramic brake discs has the above-mentioned problems in the preform manufacturing and material densification links, and a new preparation method is urgently needed to improve it in order to overcome the defects of the existing technology. Summary of the invention

[0007] In view of the above technical problems, a method for preparing a carbon-ceramic brake disc is provided, which reduces the damage of long fibers in a fiber preform caused by needle puncture, ensures the continuity of the Z-direction fibers inside the preform, improves the shear performance and overall strength of the product, and reduces the time required for product densification, shortens the production cycle, and reduces production costs by changing the densification method of the product.

[0008] In order to achieve the above object, the technical solution adopted in this application is: a method for preparing a carbon-ceramic brake disc, comprising the following steps:

[0009] Step 1. Weaving carbon fibers to form carbon fiber woven fabric;

[0010] Step 2. Mix the carbon powder, ceramic powder, liquid resin and alcohol in a ratio of 5-20:20-40:20-40:0-55 to form a fluid slurry, and then evenly cover the surface of the carbon fiber woven cloth with the slurry by spraying;

[0011] Step 3. Dry the carbon fiber woven fabric after the slurry spraying in an oven to remove the solvent on the surface of the carbon fiber woven fabric slurry;

[0012] Step 4. The dried carbon fiber woven fabric is stacked by plying and then heated and pressurized in a hot press to form a solid.

[0013] Step 5. Carbonizing the product after the pressurized curing process;

[0014] Step 6. The carbonized product is subjected to surface punching treatment. At the same time, the carbon fiber filaments are coated with resin to make carbon rods, and then the carbonized punched product is pinned with the prepared carbon fiber filament carbon rods;

[0015] Step 7. The product after the pin treatment is then subjected to an impregnation carbonization treatment;

[0016] Step 8: After the impregnation and carbonization, the product is machined and then siliconized.

[0017] In order to better implement the present invention, further, in step 1, the weight of the carbon fiber woven cloth is set to 200-500 g / m 2 The weaving method of carbon fiber can adopt the conventional weaving process of plain weave, twill weave or satin weave.

[0018] In order to better realize the present invention, further, in step 2, the ceramic powder is selected from high temperature resistant ceramic powder of silicon carbide, boron carbide or zirconium oxide, and the liquid resin is a common thermosetting resin of phenolic resin, furan resin or furfural resin.

[0019] In order to better realize the present invention, further, in step 4, the pressurization pressure is set in the range of 10MPa to 30MPa, the heating temperature is controlled at 140°C to 200°C, and at the same time, the number of woven fabric layers in the unit centimeter thickness of the product is controlled to be 10 to 20 layers, so as to achieve curing molding, and the density of the product after molding reaches 1.3 to 1.8 g / cm 3 .

[0020] In order to better implement the present invention, further, in step 5, the carbonization treatment temperature is set to 800° C. to 1000° C., and the treatment time is maintained at 2 to 6 hours.

[0021] In order to better implement the present invention, further, in step 6, the pore size range is controlled to be 0.5-1.5 mm, the number of pores per square centimeter is 1-4, and the carbon rod diameter is 0.5-1.5 mm.

[0022] In order to better realize the present invention, further, in step 7, the density of the product after the impregnation carbonization treatment reaches 1.2-1.5 g / cm 3 .

[0023] In order to better implement the present invention, further, in step 8, the siliconizing temperature is set at 1500°C to 1700°C, the time is controlled at 1 to 4 hours, and the density of the product after siliconizing reaches 2.0 to 2.4 g / cm 3 .

[0024] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0025] 1. The present invention performs ceramic powder spraying treatment on the prepared carbon fiber woven cloth, thereby increasing the density of the carbon fiber woven cloth, making the ceramic powder distribution on the surface of the single-layer carbon fiber woven cloth more uniform, and at the same time optimizing the structural performance of the brake disc according to the different ceramic powder properties;

[0026] 2. The present invention performs a hot pressing curing molding process on the sprayed carbon fiber woven fabric. Compared with the traditional needle punching method, the long fibers inside the embryo are retained to a great extent, thereby improving the structural strength and mechanical properties of the material;

[0027] 3. The present invention performs a perforation process on the carbonized embryo in the thickness direction, and uses the prepared carbon fiber filament carbon rod to perform a pinning process on the embryo, so that the material has continuous long fibers in the thickness direction, improves the shear performance of the material, and improves the mechanical properties of the brake disc under high-energy load braking conditions;

[0028] 4. The present invention adopts a densification method of hot pressing and impregnation carbonization, which significantly shortens the production time required by the traditional chemical vapor deposition process and shortens the production cycle by 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] Figure 1 It is a schematic diagram of the overall process of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0035] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Embodiment 1:

[0038] like Figure 1 As shown, a method for preparing a carbon ceramic brake disc comprises the following steps:

[0039] Step 1. Weaving carbon fibers to form carbon fiber woven fabric;

[0040] Step 2. Mix the carbon powder, ceramic powder, liquid resin and alcohol in a ratio of 5-20:20-40:20-40:0-55 to form a fluid slurry, and then evenly cover the surface of the carbon fiber woven cloth with the slurry by spraying;

[0041] Step 3. Dry the carbon fiber woven fabric after the slurry spraying in an oven to remove the solvent on the surface of the carbon fiber woven fabric slurry;

[0042] Step 4. The dried carbon fiber woven fabric is stacked by plying and then heated and pressurized in a hot press to form a solid.

[0043] Step 5. Carbonizing the product after the pressurized curing process;

[0044] Step 6. The carbonized product is subjected to surface punching treatment. At the same time, the carbon fiber filaments are coated with resin to make carbon rods, and then the carbonized punched product is pinned with the prepared carbon fiber filament carbon rods;

[0045] Step 7. The product after the pin treatment is then subjected to an impregnation carbonization treatment;

[0046] Step 8: After the impregnation and carbonization, the product is machined and then siliconized.

[0047] like Figure 1As shown, in this embodiment, in step 1, the weight of the carbon fiber woven fabric is set to 200-500 g / m 2 The weaving method of carbon fiber can adopt the conventional weaving process of plain weave, twill weave or satin weave.

[0048] like Figure 1 As shown, in this embodiment, in step 2, the ceramic powder is selected from high temperature resistant ceramic powder of silicon carbide, boron carbide or zirconium oxide, and the liquid resin is a common thermosetting resin of phenolic resin, furan resin or furfural resin.

[0049] like Figure 1 As shown, in this embodiment, in step 4, the pressurization pressure is set in the range of 10MPa to 30MPa, the heating temperature is controlled at 140℃ to 200℃, and at the same time, the number of woven fabric layers in the unit centimeter thickness of the product is controlled to be 10 to 20 layers, so as to achieve curing molding, and the density of the product after molding reaches 1.3 to 1.8g / cm 3 .

[0050] like Figure 1 As shown, in this embodiment, in step 5, the carbonization treatment temperature is set to 800° C. to 1000° C., and the treatment time is maintained at 2 to 6 hours.

[0051] like Figure 1 As shown, in this embodiment, in step 6, the aperture range is controlled to be 0.5-1.5 mm, the number of apertures per square centimeter is 1-4, and the diameter of the carbon rod is 0.5-1.5 mm.

[0052] like Figure 1 As shown, in this embodiment, in step 7, the density of the product after the impregnation carbonization treatment reaches 1.2-1.5 g / cm 3 .

[0053] like Figure 1 As shown, in this embodiment, in step 8, the siliconizing temperature is set at 1500°C to 1700°C, the time is controlled at 1 to 4 hours, and the density of the product after siliconizing reaches 2.0 to 2.4 g / cm 3 .

[0054] Working principle:

[0055] The carbon fiber is woven into a carbon fiber woven fabric, and the weight of the carbon fiber woven fabric is set to 200-500 g / m 2 This step aims to integrate the carbon fibers into a woven cloth structure with certain specifications by weaving, so as to avoid the subsequent damage to the carbon fiber filaments inside the woven cloth by 2.5D acupuncture as in the prior art, and provide a basic fiber structure for the subsequent preparation of high-quality carbon-ceramic brake discs.

[0056] Carbon powder, ceramic powder, liquid resin and alcohol are mixed in a ratio of 5-20:20-40:20-40:0-55 to form a fluid slurry, wherein the ceramic powder is selected from high temperature resistant ceramic powders such as silicon carbide, boron carbide and zirconium oxide, and the liquid resin is selected from common thermosetting resins such as phenolic resin, furan resin and furfural resin. Then the slurry is evenly covered on the surface of the carbon fiber woven cloth by spraying. Through such ceramic slurry spraying treatment, the ceramic matrix inside the material can be more evenly distributed, and the structural performance of the brake disc can be freely adjusted according to the performance of different ceramic powders;

[0057] The carbon fiber woven fabric after the slurry spraying is dried in an oven to remove the solvent on the surface of the carbon fiber woven fabric slurry, so that the woven fabric is in a state suitable for subsequent processing;

[0058] The dried carbon fiber woven fabric is then stacked by plying and cured in a hot press. During this process, the pressurization pressure is set in the range of 10MPa to 30MPa, the heating temperature is controlled at 140℃ to 200℃, and the number of woven fabric layers per unit centimeter thickness is controlled to be 10 to 20, so as to achieve curing and molding. The density of the product after molding reaches 1.3 to 1.8 g / cm 3 , using hot pressing curing molding to replace traditional chemical vapor deposition can effectively shorten the material production cycle and reduce costs;

[0059] The product after the pressurized curing molding is subjected to carbonization treatment, the carbonization treatment temperature is set to 800°C to 1000°C, and the treatment time is maintained at 2 to 6 hours, so that the internal structure and performance of the product are further optimized under the high temperature carbonization effect;

[0060] The carbonized product is subjected to surface punching treatment, the aperture range is controlled at 0.5-1.5mm, and the number of apertures per square centimeter is 1-4. At the same time, the carbon fiber filaments are coated with resin to make carbon rods with a diameter of 0.5-1.5mm. The carbon fiber filament carbon rods are then pinned to the carbonized punched product. Through such Z-direction punching pin operation, the material has continuous long fibers in the thickness direction, thereby improving the shear performance of the material in the thickness direction and improving the mechanical properties of the brake disc under high-energy load braking conditions.

[0061] The pin-treated product is then subjected to an impregnation carbonization treatment, and the density of the treated product reaches 1.2-1.5 g / cm 3 , further optimize the density and related properties of the product through impregnation carbonization;

[0062] The product after impregnation and carbonization is machined and then siliconized. The siliconization temperature is set at 1500℃~1700℃ and the time is controlled at 1~4h. The density of the product after siliconization reaches 2.0~2.4g / cm 3 Each step is closely linked and coordinated with each other to realize the complete preparation process of high-performance carbon-ceramic brake discs, ensuring that the prepared carbon-ceramic brake discs have the advantages of low density, high strength, high hardness, impact resistance, high temperature resistance, oxidation resistance, and low thermal expansion coefficient. At the same time, they also have good toughness, ductility, and thermal conductivity, meeting the application requirements of high-performance friction materials in the braking field.

[0063] In the step of weaving the carbon fiber to form a carbon fiber woven cloth, the carbon fiber can be woven by conventional weaving processes such as plain weave, twill weave or satin weave to ensure the structural stability of the woven cloth and the uniformity of fiber distribution, and the gram weight is 200-500g / m 2 The limitation is determined based on the mechanical properties, density requirements and other factors of the final carbon ceramic brake disc. Different weights of carbon fiber woven cloth will affect the processing effects of subsequent steps and the overall performance of the final product. For example, if the weight is too low, the brake disc may be insufficient in strength, while if the weight is too high, it may affect the uniform penetration of other material components and the operability of the overall process.

[0064] In the step of mixing carbon powder, ceramic powder, liquid resin and alcohol to form a fluid slurry and spraying it, the ratio range of the carbon powder, ceramic powder, liquid resin and alcohol is set after a large number of experimental verifications, aiming to ensure that the slurry has good fluidity to achieve uniform spraying and coverage on the surface of the carbon fiber woven cloth, and in the subsequent processing, the various components can work together to achieve the purpose of optimizing the distribution of the ceramic matrix and freely regulating the performance of the material. Among them, the ceramic powder is selected from high-temperature resistant ceramic powders such as silicon carbide, boron carbide and zirconium oxide, because these ceramic materials themselves have the characteristics of high temperature resistance, high hardness and good chemical stability, which can significantly improve the performance of carbon ceramic brake discs in high-temperature braking environments;

[0065] The following is a table 1 about the ratio range of carbon powder, ceramic powder, liquid resin and alcohol, which has been verified by a large number of experiments:

[0066] Table 1: Performance of carbon powder, ceramic powder, liquid resin and alcohol in the range of ratio settings

[0067]

[0068]

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

[0078] Specific instructions:

[0079] Evaluation of slurry fluidity: When spraying with a spray gun, observe how smoothly the slurry is sprayed out of the spray gun, whether the spray gun is blocked, and how evenly the slurry is covered on the surface of the carbon fiber woven cloth. The slurry fluidity can be described qualitatively and divided into different levels, such as good, better, acceptable, and poor, to determine whether the slurry can be sprayed evenly under different proportions.

[0080] Evaluation of the uniformity of ceramic matrix distribution (through SEM observation): Scanning electron microscopy (SEM) was used to observe the microstructure of samples prepared after treatment with different slurry ratios, focusing on the distribution state of ceramic particles within the material, such as whether there is agglomeration, the density of particle distribution, and the overall uniformity, etc., and then a corresponding qualitative evaluation was given to determine the influence of the proportion of each component on the uniformity of the ceramic matrix distribution.

[0081] Tensile strength, shear strength and hardness test: A universal material testing machine is used to conduct mechanical property tests on the prepared carbon ceramic brake disc samples according to standard test methods to obtain the corresponding tensile strength, shear strength and hardness data. By comparing these mechanical performance indicators under different proportion combinations, the influence of changes in the proportion of each component on the mechanical properties of the brake disc is analyzed.

[0082] High temperature resistance (initial decomposition temperature): Use a thermogravimetric analyzer (TGA) to detect the weight loss of the sample during the heating process at a set heating rate (for example, 10°C / min). Record the temperature when obvious weight loss begins as the initial decomposition temperature to measure the high temperature resistance of different samples. The higher the initial decomposition temperature means that the sample has a stronger ability to maintain structural stability in a high temperature environment, thereby reflecting the influence of the proportion of each component on the high temperature resistance of the brake disc.

[0083] It can be seen from the above table that when the carbon powder ratio is within the range of 5-20%, the ceramic powder ratio is within the range of 20-40%, the liquid resin ratio is within the range of 20-40%, and the alcohol ratio is within the range of 0-55%, the overall slurry fluidity, ceramic matrix distribution uniformity, mechanical properties and high temperature resistance can achieve relatively good comprehensive effects. This further verifies that the set ratio range is reasonable and meets the goals of making the ceramic matrix distribution inside the material more uniform and freely regulating the structural performance of the brake disc.

[0084] The liquid resin is selected from commonly used thermosetting resins such as phenolic resin, furan resin, and furfural resin, taking into account its curing characteristics and compatibility with other ingredients, which helps to ensure the stability and integrity of the product structure in subsequent heating and pressure curing molding processes.

[0085] In the step of stacking the dried carbon fiber woven fabrics by laying them up and heating and pressurizing them for curing in a hot press, the pressurizing pressure is controlled at 10MPa-30MPa and the heating temperature is in the range of 140℃-200℃, in order to ensure that the carbon fiber woven fabrics can be fully compacted and the resin can be effectively cured, while avoiding damage to the fibers or internal defects in the product due to excessive pressure or temperature. The number of woven fabric layers per centimeter of the product is controlled to be 10-20 layers, which is determined by weighing the thickness, density, and mechanical properties of the final desired carbon ceramic brake disc. A reasonable arrangement of the number of layers can ensure that the density of the product reaches 1.3-1.8g / cm after curing. 3 , so that it has good structural strength and meets the basic performance conditions for subsequent processing and use, and through hot pressing curing molding instead of chemical vapor deposition, it fundamentally changes the material densification method and greatly shortens the time required for densification, thereby significantly shortening the production cycle of the entire product and reducing production costs, effectively overcoming the defects of long production cycle and high cost brought about by the chemical vapor deposition method in the existing technology.

[0086] In the step of carbonizing the product after pressurized curing, the carbonization temperature is set to 800°C ~ 1000°C, and the time is maintained at 2 ~ 6h. This temperature and time range is determined after repeated tests and optimization. Carbonization treatment within this temperature range and time range can fully decompose and transform the organic components inside the product, while forming a more stable bonding structure between the ceramic component and the carbon fiber, further improving the product's high temperature resistance, hardness and overall mechanical properties, etc., laying a good internal structure foundation for subsequent processing steps such as drilling and pinning, ensuring that the carbon-ceramic brake disc can stably and reliably perform its braking function during subsequent processing and actual use, especially when dealing with complex working conditions such as high temperature and high load. It can maintain good performance.

[0087] In the steps of surface drilling of the carbonized product and making carbon rods and pinning, the aperture range is controlled to 0.5-1.5 mm, and the number of apertures per square centimeter is set to 1-4, based on comprehensive consideration of the improvement of the mechanical properties of the material in the thickness direction and the stability of the overall structure. The appropriate aperture size and number distribution can not only ensure the convenience of operation when the carbon rods are subsequently inserted for pinning, but also enable the material to form a continuous long fiber structure through the connection of the carbon rods in the thickness direction, effectively improving the shear performance of the material, enhancing the mechanical properties of the brake disc under high-energy load braking conditions, and avoiding safety hazards such as damage to the brake disc due to excessive shear force, thereby ensuring the reliability and safety of carbon ceramic brake discs in high-performance braking applications.

[0088] In the step of impregnating and carbonizing the product after the pin treatment, the density of the treated product reaches 1.2 to 1.5 g / cm 3 In the process of impregnation carbonization, the reasonable selection and control of parameters such as the composition of the impregnation liquid, the impregnation time, and the impregnation temperature are crucial. By precisely controlling these parameters, the impregnation carbonization can further fill the pores inside the product, optimize the microstructure of the product, improve the uniformity of the product's density, and further improve the overall strength, hardness, and other related performance indicators of the product, making it more in line with the high-performance requirements of carbon-ceramic brake discs in actual braking applications. In addition, it cooperates with the previous process steps to jointly improve the preparation process of carbon-ceramic brake discs and ensure that the quality and performance of the final product meet the expected standards.

[0089] In the step of siliconizing after machining the impregnated carbonized product, the siliconizing temperature is set at 1500℃~1700℃, the time is controlled at 1~4h, and the density of the product after siliconizing reaches 2.0~2.4g / cm 3 . The selection of such siliconizing process parameters is determined based on the reaction characteristics of silicon and the internal components of carbon ceramic brake discs and the demand for improved performance of the final product. Siliconizing within this temperature and time range can allow silicon to fully penetrate into the product, further improving the key performance indicators of the product such as hardness, wear resistance, and oxidation resistance, while making the product density reach the ideal range, ensuring that the carbon ceramic brake disc has stable high performance during long-term braking use, extending its service life, and meeting the stringent requirements for high-performance friction materials in different braking application scenarios.

[0090] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a carbon ceramic brake disc, characterized in that: The following steps are involved: Step 1. Weaving carbon fibers to form carbon fiber woven fabric; Step 2. Mix the carbon powder, ceramic powder, liquid resin and alcohol in a ratio of 5-20:20-40:20-40:0-55 to form a fluid slurry, and then evenly cover the surface of the carbon fiber woven cloth with the slurry by spraying; Step 3. Dry the carbon fiber woven fabric after the slurry spraying in an oven to remove the solvent on the surface of the carbon fiber woven fabric slurry; Step 4. The dried carbon fiber woven fabric is stacked by plying and then heated and pressurized in a hot press to form a solid. Step 5. Carbonizing the product after the pressurized curing process; Step 6. The carbonized product is subjected to surface punching treatment. At the same time, the carbon fiber filaments are coated with resin to make carbon rods, and then the carbonized punched product is pinned with the prepared carbon fiber filament carbon rods; Step 7. The product after the pin treatment is then subjected to an impregnation carbonization treatment; Step 8: After the impregnation and carbonization, the product is machined and then siliconized.

2. The method for preparing a carbon ceramic brake disc according to claim 1, characterized in that: In step 1, the weight of the carbon fiber woven fabric is set to 200-500 g / m 2 The weaving method of carbon fiber can adopt the conventional weaving process of plain weave, twill weave or satin weave.

3. The method for preparing a carbon ceramic brake disc according to claim 1, characterized in that: In step 2, the ceramic powder is a high temperature resistant ceramic powder of silicon carbide, boron carbide or zirconium oxide, and the liquid resin is a common thermosetting resin of phenolic resin, furan resin or furfural resin.

4. The method for preparing a carbon ceramic brake disc according to claim 1, characterized in that: In step 4, the pressurization pressure is set in the range of 10MPa to 30MPa, the heating temperature is controlled at 140℃ to 200℃, and at the same time, the number of woven fabric layers per unit centimeter thickness is controlled to be 10 to 20 layers, so as to achieve curing molding. After molding, the density of the product reaches 1.3 to 1.8 g / cm 3 .

5. The method for preparing a carbon ceramic brake disc according to claim 1, characterized in that: In step 5, the carbonization treatment temperature is set to 800° C. to 1000° C., and the treatment time is maintained at 2 to 6 hours.

6. The method for preparing a carbon ceramic brake disc according to claim 1, characterized in that: In step 6, the aperture range is controlled to be 0.5 to 1.5 mm, the number of apertures per square centimeter is 1 to 4, and the diameter of the carbon rod is 0.5 to 1.5 mm.

7. The method for preparing a carbon ceramic brake disc according to claim 1, characterized in that: In step 7, the density of the product after impregnation and carbonization treatment reaches 1.2-1.5 g / cm 3 .

8. The method for preparing a carbon ceramic brake disc according to claim 1, characterized in that: In step 8, the siliconizing temperature is set at 1500℃~1700℃, the time is controlled at 1~4h, and the density of the product after siliconizing reaches 2.0~2.4g / cm 3 .

Images