Carbon ceramic brake disc assembly, preparation method and application thereof

Abstract

The application discloses a carbon ceramic brake disc assembly and a preparation method and application thereof, and belongs to the technical field of brake disc assembly.The carbon ceramic brake disc assembly is composed of n static disc assemblies, n+1 dynamic discs, one pressure bearing disc and one pressure disc; the static disc, the dynamic disc, the pressure bearing disc and the pressure disc all contain a carbon fiber reinforced body, a C matrix and a SiC matrix; the mass fraction of the C matrix in the dynamic disc is 28%-50%; the mass fraction of the C matrix in the static disc, the pressure bearing disc and the pressure disc is 38%-55%; the carbon ceramic material brake disc assembly provided in the application has a slightly higher carbon content, a slightly lower ceramic content and a slightly lower hardness in the static disc assembly, the pressure bearing disc and the pressure disc than in the dynamic disc, and the compression elastic modulus of the carbon ceramic material brake disc assembly is 20-50% lower than that of the dynamic disc; in the process of airplane braking, the pressure disc, the static disc, the pressure bearing disc and the dynamic disc are mutually rubbed to generate a great friction force; the compression elastic modulus of the static disc is relatively lower than that of the dynamic disc, the compressibility deformation capacity is good, and the vibration caused by the braking process can be well offset.

Description

Technical Field

[0001] This invention relates to a carbon ceramic brake disc assembly, its preparation method, and its application, belonging to the field of aviation brakes. Background Technology

[0002] An aircraft disc brake system mainly consists of an actuating mechanism (cylinder seat), friction components (brake disc assembly and thermal friction parts), and a support frame (brake housing). During braking, hydraulic oil pressure pushes the piston in the cylinder seat to extend, acting on the pressure disc and transmitting force to the relatively stationary disc (which can only move along the brake axis). This disc presses against the rotating disc, which is driven by the wheel. The interaction between the stationary and rotating discs generates friction, creating a braking torque that decelerates and brakes the aircraft. During landing, the frequent action of the braking system can cause varying degrees of vibration in the landing gear system. The frictional characteristics of the brake discs are one factor inducing this vibration.

[0003] With the increasing application of carbon-ceramic brake discs, aircraft braking vibration can affect the fatigue life of carbon-ceramic brake systems and landing gear, leading to structural damage and ultimately impacting flight safety. Therefore, it is essential to start with the design and production of carbon-ceramic brake materials, optimizing the design and manufacturing process to obtain a set of aircraft carbon-ceramic brake disc components with low vibration and low noise, thereby reducing and minimizing aircraft braking vibration. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the first objective of this invention is to provide a carbon-ceramic brake disc assembly for aircraft with low vibration and low noise, thereby solving the brake vibration and noise problems caused by the frictional characteristics of carbon-ceramic materials.

[0005] The second objective of this invention is to provide a method for preparing a carbon ceramic brake disc assembly;

[0006] The third objective of this invention is to provide an application of a carbon ceramic material brake disc assembly.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The present invention provides a carbon ceramic brake disc assembly, which consists of n stationary disc assemblies, n+1 moving discs, 1 pressure bearing disc, and 1 clamping disc; the stationary disc assembly consists of 2 stationary discs and a buffer disc sandwiched between the 2 stationary discs; the n stationary disc assemblies are respectively located between the n+1 moving discs, and the pressure bearing disc and the clamping disc are respectively located at both ends of the stationary disc assembly;

[0009] The stationary plate, moving plate, pressure plate, and clamping plate all contain carbon fiber reinforcement, C matrix, and SiC matrix. In the moving plate, the mass fraction of C matrix is ​​28% to 50%, preferably 30% to 43%. In the stationary plate, pressure plate, and clamping plate, the mass fraction of C matrix is ​​38% to 55%, preferably 47% to 52%. The buffer plate is made of carbon-carbon material, and n is 1 to 3.

[0010] The carbon-ceramic brake disc assembly provided in this invention consists of n stationary disc assemblies, n+1 moving discs, one pressure plate, and one clamping plate (n = 1-3). The moving disc is a carbon-ceramic composite material that rotates with the wheel and is connected to the wheel via toothed grooves. Its significant characteristics are low carbon matrix content, high ceramic content, high hardness, and low wear. The stationary disc assemblies, pressure plate, and clamping plate are also carbon-ceramic composite materials and do not rotate with the wheel. Their significant characteristics are slightly higher carbon content, slightly lower ceramic content, slightly lower hardness, and a 20-50% lower compressive modulus than the moving disc. During aircraft braking, the piston in the axial cylinder seat pushes the pressure plate. The relatively stationary clamping plate, stationary disc, pressure plate, and rotating moving disc rub against each other, generating significant frictional force. The stationary disc has a relatively lower compressive modulus than the moving disc, resulting in better compressibility and deformation capacity, which effectively counteracts vibrations caused by braking.

[0011] In a preferred embodiment, the carbon fiber reinforcement in the moving disc is a 2.5D needle-punched carbon fiber preform with a density of 0.47-0.53 g / cm³. 3 .

[0012] The 2.5D needle-punched carbon fiber preform is produced by laying layers to a certain thickness using a "0° non-woven fabric – mesh – 90° non-woven fabric – mesh" method. Then, relay-style needle punching is employed, where barbed needles are used to vertically insert carbon fibers, thus connecting multiple layers of fibers into a cohesive structure. The vertical fiber content is controlled by adjusting the needle type, the number of barbs, the needle density, and the depth. The 2.5D needle-punched preform maintains the required mechanical properties of the friction material while relatively reducing costs, making it one of the most commonly used structures in China.

[0013] In a preferred embodiment, the moving disk further contains Ti3SiC2 dispersed in the SiC matrix. The inventors have discovered that the presence of Ti3SiC2 can enable the friction surface to form self-lubricating thin film fragments, giving the composite material higher frictional stability and lower wear rate.

[0014] In a preferred embodiment, the carbon fiber reinforcement in the stationary disc, pressure disc, and clamping disc is a three-layer prefabricated structure, wherein the middle layer is composed of layers of non-woven fabric and mesh in the XY direction, with 12-14 layers / cm² of non-woven fabric and mesh, and a bulk density of 0.47-0.53 g / cm³. 3The thickness of both the upper and lower layers is 3-8mm, using short carbon fiber felt with a bulk density of 0.08-0.15g / cm³. 3 The short carbon fiber in the short carbon fiber felt has a length of 60-90mm. By using the above-mentioned carbon fiber reinforcement in the stationary plate, bearing plate, and clamping plate, a material with a high ceramic content in the functional layer and a low ceramic content in the structural layer can be obtained. This is beneficial to reducing the elastic modulus inside the material, allowing the material to produce a certain amount of elastic deformation and absorb energy.

[0015] In a preferred embodiment, the density of the buffer disk is 1.5-1.7 g / cm³. 3 The thickness is 5-15mm.

[0016] In a preferred embodiment, the buffer disc and the stationary disc are connected by mortise and tenon joints. The buffer disc can serve as a vibration isolation device, thereby reducing or isolating the transmission of vibration by setting a vibration isolation device between the vibration source and the vibrating body, reducing the fluctuation of braking torque, and slowing down the vibration of the wheel; secondly, adding a buffer layer can change the frequency of the stationary disc's vibration and reduce the generation of howling noise.

[0017] In a preferred embodiment, the density of the moving plate, stationary plate, pressure plate, and clamping plate is all 2.1-2.3 g / cm³. 3 .

[0018] This invention also provides a method for preparing a carbon-ceramic brake disc assembly, comprising preparing a moving disc, a stationary disc, a pressure-bearing disc, and a clamping disc separately, and then assembling the moving disc, stationary disc, buffer disc, pressure-bearing disc, and clamping disc to obtain the final product; the preparation process of the moving disc is as follows: firstly, a 2.5D needle-punched carbon fiber preform is subjected to chemical vapor deposition of a carbon matrix until a density of 1.15-1.35 g / cm³ is obtained. 3 The carbon-carbon composite material A is obtained by heat-treating the carbon-carbon composite material A to obtain a carbon-carbon preform C, and then the carbon-carbon preform C is subjected to reactive molten silicon infiltration to obtain the final product. The preparation process of the static plate, the pressure plate, and the clamping plate is as follows: an intermediate layer is obtained by laminating XY square non-woven fabric and a mesh layer, and then short carbon fiber felt is laid on the upper and lower layers of the intermediate layer preform. Then, the three-layer structure preform is obtained by needle punching in the Z direction. The density of the three-layer structure preform is obtained as 1.4-1.65 g / cm³. 3 The carbon-carbon composite material B is obtained by heat treatment of the carbon-carbon composite material B to obtain carbon-carbon preform D, and finally carbon-carbon preform D is subjected to reactive molten silicon infiltration to obtain the final product.

[0019] In a preferred embodiment, during the fabrication of the moving disk, the needle density of the 2.5D needle-punched carbon fiber preform used is 30-50 needles / cm. 2 .

[0020] In a preferred embodiment, during the preparation of the moving disk, the carbon source gas used in the chemical vapor deposition is a mixture of propane and natural gas, wherein the volume ratio of propane to natural gas is 1:1-5; the temperature of the chemical vapor deposition is 900-1000℃, and the time is 200-300h.

[0021] CVD deposition of carbon matrix uses N2 as a dilution and protective gas. Pyrolytic carbon is generated through chemical reactions such as thermal decomposition, dehydrogenation, and condensation of propane and natural gas. For chemical vapor deposition, propylene, propane, and natural gas are commonly used carbon source gases because they are inexpensive and have high carbon acceptance rates, but the carbon obtained varies. Propylene decomposition yields larger carbon particles, natural gas yields smaller carbon particles, and propane yields particles in between. When preparing the moving disk, a mixture of propane and natural gas is used, and the carbon matrix is ​​deposited under low vacuum by controlling the ratio of the two gases to obtain a faster deposition rate and better porosity.

[0022] In a preferred embodiment, during the preparation of the moving disk, the heat treatment temperature is 2000-2200℃, and the heat treatment time is 4-6 hours. Through high-temperature heat treatment, graphitization and grain refinement are achieved.

[0023] In a preferred embodiment, during the preparation of the moving disk, the silicon infiltration powder used during the reaction molten silicon infiltration process is composed of silicon powder and TiC powder, with a mass ratio of silicon powder:TiC powder = 90-95: 5-10; the particle size of the silicon powder is 50-200μm, the particle size of the TiC powder is 10-100μm, and the particle size of the TiC powder is less than the particle size of the silicon powder.

[0024] The inventors discovered that controlling the particle size of TiC powder and silicon powder within the aforementioned range, while ensuring the TiC powder particle size is slightly smaller than the silicon powder particle size, facilitates the uniform reaction of the two powders at high temperatures. This avoids the situation where one silicon powder completely reacts while a large amount of TiC powder remains. TiC powder itself has high hardness and is a friction component; excessive residual powder negatively impacts frictional performance, leading to a higher coefficient of friction or greater wear. If the TiC powder particle size is too small, its surface activity is higher, causing premature reaction and resulting in a large amount of residual silicon powder. The residual silicon powder exhibits poor high-temperature stability, which can reduce the material's operating temperature and creep resistance.

[0025] In actual operation, the purity of TiC powder used is above 99.9%, and the purity of silicon powder is above 99.5%.

[0026] The inventors discovered that TiC can undergo an in-situ sintering reaction with silicon carbide at the silicon infiltration temperature to produce fine-grained, high-hardness, and wear-resistant Ti3SiC2. The presence of Ti3SiC2 can form self-lubricating film fragments on the friction surface, giving the composite material higher friction stability and lower wear rate.

[0027] In a preferred embodiment, during the preparation of the moving disk, the temperature during the molten silicon infiltration reaction is 1500-1800℃ and the time is 3-6 hours.

[0028] In a preferred embodiment, during the preparation of the stationary plate, the pressure plate, and the clamping plate, the needle density of the intermediate layer during Z-axis needle punching is 30-50 needles / cm. 2 The needle density in the upper and lower layers is 20-40 needles / cm. 2 The needle insertion depth is controlled between 1-5mm.

[0029] In this invention, the stationary disc, pressure disc, and clamping disc are all prefabricated three-layer structures: upper, middle, and lower layers. The middle structural layer is a non-woven mesh laminate in the XY direction. As a structural layer, the number of non-woven mesh laminate layers is (13±1) layers / cm, and the bulk density is (0.5±0.03) g / cm³. 3 This ensures that it can effectively bear the strength of the entire precast structure; the upper and lower layers are friction functional layers, each with a thickness of 3-8mm, using short carbon fiber felt with a fiber length of 60-90mm and a bulk density of (0.12±0.03)g / cm³. 3 This type of preform structure allows for a higher ceramic content in the functional layer and a lower ceramic content in the structural layer. This reduces the internal elastic modulus of the material, enabling it to undergo elastic deformation and absorb energy. The functional and structural layers are needled in the Z-direction. However, the needle-punching process can damage the fibers within the preform; therefore, the process parameters must be carefully controlled. The needle-punching density for the structural layer is 30-50 needles / cm². 2 The needle density in the functional layer is 20-40 needles / cm. 2 The needle penetration depth is controlled between 1-5 mm. By adjusting the structure of the material preform, defects in the preform preparation can be weakened or even eliminated, thereby improving the overall performance of the material.

[0030] In a preferred embodiment, during the preparation of the stationary plate, pressure plate, and clamping plate, the carbon source gas used in the chemical vapor deposition (CVD) is a mixture of propane and natural gas, with a volume ratio of propane:natural gas = 2:1-3. The CVD temperature is 900-950℃, and the deposition time is 400-600 hours. By depositing for 400-600 hours under the above process, the carbon-carbon composite material B density reaches 1.4-1.65 g / cm³. 3 The content of propane is higher than that of carbon matrix deposition in the moving plate. In the preparation of the stationary plate, pressure plate, and clamping plate, a higher content of propane is used, as propane has a higher carbon content than natural gas. Therefore, for the same volume, a higher propane content results in more pyrolytic carbon, thus obtaining the required density of carbon composite materials more efficiently.

[0031] In a preferred embodiment, during the preparation of the static plate, the pressure plate, and the clamping plate, the heat treatment temperature is 2000-2200℃ and the heat treatment time is 4-6 hours.

[0032] In a preferred embodiment, during the preparation of the static plate, the pressure plate, and the clamping plate, the silicon infiltrate powder used is silicon powder with a particle size of 50-200μm, the reaction molten silicon infiltration temperature is 1500-1800℃, and the reaction molten silicon infiltration time is 3-6h.

[0033] The present invention also provides an application of a carbon-ceramic material brake disc assembly, wherein the carbon-ceramic material brake disc assembly is applied to an aircraft.

[0034] Advantages and positive effects of the present invention

[0035] This invention, through material composition design, functional layer design, and structural design, yields a set of aircraft carbon-ceramic material brake disc components with low braking vibration and low braking noise.

[0036] Material composition design: Different compositions for the moving and stationary discs (including the pressure plate and the clamping plate) are designed. The carbon / carbon material blank density of the moving disc is 1.15-1.35 g / cm³. 3 The density of carbon / carbon material blanks is 1.4-1.65 g / cm³, lower than that of the static plate (including the pressure plate and the clamping plate). 3 The increased carbon content in the matrix of the stationary disc (including the bearing disc and the clamping disc) reduces the elastic modulus of the brake disc, decreases the material rigidity, and changes the frequency of noise generation.

[0037] The moving and stationary discs (including the pressure plate and the clamping plate) employ different prefabricated structures. The moving disc uses the most commonly used 2.5D prefabricated material, supplemented by a melt infiltration process to obtain a dense, high-hardness, and wear-resistant friction layer. The stationary disc is a prefabricated material composed of a friction layer and a structural layer. The friction layer features high ceramic content, density, and wear resistance, which helps reduce the internal elastic modulus of the material, allowing the material to undergo a certain degree of elastic deformation and absorb elastic energy. By adjusting the prefabricated structure, defects in the prefabricated material preparation can be weakened or even eliminated, thereby improving the overall performance of the material.

[0038] The silicate powder in the moving disc material incorporates TiC, which has a melting point of 3140±90℃, a boiling point of 4820℃, and a Mohs hardness greater than 9, making it an inherently wear-resistant and high-hardness material. At the silicate infiltration temperature, TiC can undergo an in-situ sintering reaction with silicon carbide to produce fine-grained, high-hardness, and wear-resistant Ti3SiC2. Ti3SiC2 possesses metallic properties, exhibiting excellent thermal and electrical conductivity at room temperature, relatively low Vickers hardness, and a high elastic modulus; it is ductile at room temperature and can be processed like a metal, while exhibiting plasticity at high temperatures; simultaneously, it possesses ceramic properties, with high yield strength, high melting point, high thermal stability, and good oxidation resistance, maintaining high strength at high temperatures. More significantly, it exhibits a lower coefficient of friction and better self-lubricating properties than traditional solid lubricants such as graphite and molybdenum disulfide. The presence of Ti3SiC2 allows the formation of self-lubricating film fragments on the friction surface, resulting in higher frictional stability and a lower wear rate for the composite material.

[0039] The structure of the static tray has been optimized, adopting a three-layer structure: the middle layer of the static tray has a density of 1.5-1.7 g / cm³. 3 A buffer layer made of carbon-carbon material. The carbon-carbon buffer layer can play a role in vibration isolation. By setting up a vibration isolation device between the vibration source and the vibrating body, the transmission of vibration is reduced or isolated, the fluctuation of braking torque is reduced, and the vibration of the wheel is slowed down. Secondly, adding a buffer layer can change the frequency of the static disc vibration and reduce the generation of howling noise. Detailed Implementation

[0040] Example 1

[0041] (I) Preparation of the moving plate

[0042] The moving disc uses a 2.5D needle-punched carbon fiber preform with a bulk density of 0.52 g / cm³. 3 The needle density is 35 needles / cm². 2 .

[0043] CVD deposition of carbon matrix: a mixture of propane and natural gas in a 1:2 ratio, with N2 as both dilution and protective gas; deposition temperature of 950℃; deposition time of 200 h; achieving a density of 1.25 g / cm³. 3 .

[0044] High-temperature heat treatment: heating rate is 5℃ / min, heat treatment temperature is 2200℃, and treatment time is 5h.

[0045] Reactive molten silicon infiltration: based on a final density of 2.1 g / cm³ 3The silica-infiltrating powder consisted of 95% silicon powder and 5% TiC powder. The silicon powder had a purity of 99.5% and a particle size of 75 micrometers, while the TiC powder had a purity of over 99.9% and a particle size of 50 micrometers. The silica-infiltrating temperature was 1700℃, and the processing time was 3.5 hours.

[0046] (II) Preparation of stationary discs (including bearing discs and clamping discs)

[0047] It uses high tensile modulus carbon fiber and has a three-layer prefabricated structure (top, middle, and bottom layers). The middle structural layer is a non-woven mesh laminate in the XY direction, with 13 non-woven mesh layers / cm and a bulk density of 0.52 g / cm³. 3 The upper and lower friction layers are each 5mm thick, made of short carbon fiber felt with a fiber length of 80mm and a bulk density of 0.12g / cm³. 3 The needle-punching density of the structural layer is 30 needles / cm. 2 The acupuncture density in the functional layer is 20 needles / cm. 2 The needle insertion depth was controlled at 2mm.

[0048] CVD deposition of a carbon matrix consisting of propane and natural gas in a 2:1 ratio at a deposition temperature of 950℃ and a deposition time of 400 h resulted in a density of 1.55 g / cm³. 3 .

[0049] The high-temperature heat treatment process is the same as the production process of the moving disc.

[0050] Reactive molten silicon infiltration: The billet is placed in a silicon infiltration furnace, and the final density is 2.2 g / cm³. 3 The silicon powder was prepared with a purity of 99.5% and a particle size of 75 micrometers. The silicon infiltration temperature was 1700℃ and the treatment time was 3.5 hours.

[0051] The moving plate, stationary plate, pressure plate, and clamping plate are machined according to the drawings.

[0052] The middle layer of the still plate has a density of 1.6 g / cm³. 3 The buffer layer, made of carbon carbon material, is 8mm thick. The buffer layer and the static disk carbon ceramic material are connected by riveting to obtain the static disk assembly.

[0053] The brake disc assembly was obtained by assembling the moving disc, components, bearing disc, and clamping disc. The experimental results are shown in Table 1.

[0054] Example 2

[0055] (I) Preparation of the moving plate

[0056] The moving disc uses a 2.5D needle-punched carbon fiber preform with a bulk density of 0.48 g / cm³. 3 The needle density is 30 needles / cm².2 .

[0057] CVD deposition of a carbon matrix: a mixture of propane and natural gas in a ratio of 1:1.5, with N2 as both dilution and protective gas; deposition temperature of 980℃; deposition time of 150 h; achieving a density of 1.18 g / cm³. 3 .

[0058] High-temperature heat treatment: heating rate is 4℃ / min, heat treatment temperature is 2100℃, and treatment time is 4h.

[0059] Reactive molten silicon infiltration: based on a final density of 2.15 g / cm³ 3 The silica-infiltrating powder consisted of 97% silicon powder and 3% TiC powder. The silicon powder had a purity of 99.5% and a particle size of 75 micrometers, while the TiC powder had a purity of over 99.9% and a particle size of 50 micrometers. The silica-infiltrating temperature was 1600℃, and the treatment time was 4 hours.

[0060] (II) Preparation of stationary discs (including bearing discs and clamping discs)

[0061] It uses high tensile modulus carbon fiber and has a three-layer prefabricated structure (top, middle, and bottom layers). The middle structural layer is a non-woven mesh laminate in the XY direction, with 13 non-woven mesh layers / cm and a bulk density of 0.48 g / cm³. 3 The upper and lower friction layers are each 3mm thick, made of short carbon fiber felt with a fiber length of 60mm and a bulk density of 0.10g / cm³. 3 The needle-punching density of the structural layer is 35 needles / cm. 2 The acupuncture density in the functional layer is 25 needles / cm. 2 The needle insertion depth was controlled at 3mm.

[0062] CVD deposition of a carbon matrix consisting of propane and natural gas in a 2:1.5 ratio at a deposition temperature of 930℃ and a deposition time of 400 h resulted in a density of 1.50 g / cm³. 3 .

[0063] The high-temperature heat treatment process is the same as the production process of the moving disc.

[0064] Reactive molten silicon infiltration: The billet is placed in a silicon infiltration furnace, and the final density is 2.15 g / cm³. 3 The silicon powder was prepared with a purity of 99.5% and a particle size of 75 micrometers. The silicon infiltration temperature was 1650℃ and the treatment time was 4 hours.

[0065] The moving plate, stationary plate, pressure plate, and clamping plate are machined according to the drawings.

[0066] The middle layer of the still plate has a density of 1.55 g / cm³. 3The buffer layer, made of carbon carbon material, is 6mm thick. The buffer layer and the static disk carbon ceramic material are connected by riveting to obtain the static disk assembly.

[0067] The brake disc assembly was obtained by assembling the moving disc, components, bearing disc, and clamping disc. The experimental results are shown in Table 1.

[0068] Example 3

[0069] (I) Preparation of the moving plate

[0070] The moving disc uses a 2.5D needle-punched carbon fiber preform with a bulk density of 0.5 g / cm³. 3 The needle density is 50 needles / cm². 2 .

[0071] CVD deposition of a carbon matrix: a mixture of propane and natural gas in a ratio of 1:2.5, with N2 as both dilution and protective gas; deposition temperature of 980℃; deposition time of 300 h; achieving a density of 1.35 g / cm³. 3 .

[0072] High-temperature heat treatment: heating rate is 8℃ / min, heat treatment temperature is 2200℃, and treatment time is 6h.

[0073] Reactive molten silicon infiltration: based on a final density of 2.05 g / cm³ 3 The silica-infiltrating powder consisted of 95% silicon powder and 5% TiC powder. The silicon powder had a purity of 99.5% and a particle size of 75 micrometers, while the TiC powder had a purity of over 99.9% and a particle size of 50 micrometers. The silica-infiltrating temperature was 1750℃, and the processing time was 3 hours.

[0074] (II) Preparation of stationary discs (including bearing discs and clamping discs)

[0075] It uses high tensile modulus carbon fiber and has a three-layer prefabricated structure (top, middle, and bottom layers). The middle structural layer is a non-woven mesh laminate in the XY direction, with 13 non-woven mesh layers / cm and a bulk density of 0.5g / cm³. 3 The upper and lower friction layers are each 8mm thick, made of short carbon fiber felt with a fiber length of 100mm and a bulk density of 0.15g / cm³. 3 The needle-punching density of the structural layer is 40 needles / cm. 2 The acupuncture density in the functional layer is 35 needles / cm. 2 The needle insertion depth was controlled at 5mm.

[0076] CVD deposition of a carbon matrix consisting of propane and natural gas in a ratio of 2:1.05, at a deposition temperature of 100℃ and a deposition time of 300 h, achieving a density of 1.60 g / cm³. 3 .

[0077] The high-temperature heat treatment process is the same as the production process of the moving disc.

[0078] Reactive molten silicon infiltration: The billet is placed in a silicon infiltration furnace, and the final density is 2.15 g / cm³. 3 The silicon powder was prepared with a purity of 99.5% and a particle size of 75 micrometers. The silicon infiltration temperature was 1750℃ and the treatment time was 3 hours.

[0079] The moving plate, stationary plate, pressure plate, and clamping plate are machined according to the drawings.

[0080] The middle layer of the still plate has a density of 1.65 g / cm³. 3 A 10mm thick buffer layer made of carbon-carbon material is used to connect the buffer layer and the static disk carbon ceramic material by riveting to obtain the static disk assembly.

[0081] The brake disc assembly was obtained by assembling the moving disc, components, bearing disc, and clamping disc. The experimental results are shown in Table 1.

[0082] Comparative Example 1

[0083] Both the moving and stationary discs (including the pressure plate and the clamping plate) are made of 2.5D needle-punched carbon fiber preforms with a bulk density of 0.55 g / cm³. 3 The needle density is 35 needles / cm². 2 .

[0084] CVD deposition of a carbon matrix consisting of propane and natural gas in a 1:2 ratio, with N2 as both dilution and protective gas, at a deposition temperature of 1000℃ for 300 hours, achieving a density of 1.35 g / cm³. 3 .

[0085] High-temperature heat treatment: heating rate is 5℃ / min, heat treatment temperature is 2100℃, and treatment time is 4h.

[0086] Reactive molten silicon infiltration: based on a final density of 2.3 g / cm³ 3 Silica powder with a purity of 99.5% and a particle size of 75 micrometers was prepared. The silica powder was infiltrated at a temperature of 1700℃ for 3.5 hours. This resulted in the production of a moving disc, component assembly, pressure plate, clamping disc, and brake disc assembly. The experimental results are shown in Table 1.

[0087] Comparative Example 2

[0088] The raw materials and preparation conditions used for both the moving and stationary discs were the same as in Example 1, except that TiC powder was not added in the reactive silicon infiltration process for the moving disc preparation; instead, pure silicon powder was used. This resulted in the moving disc, the component, the pressure plate, the clamping disc, and the brake disc assembly. The experimental results are shown in Table 1.

[0089] Comparative Example 3

[0090] The raw materials and preparation conditions used for both the moving and stationary disks were the same as in Example 2. The only difference was the CVD deposition process parameters for the carbon matrix prepared by the moving disk, which were the same as those for the stationary disk: propane and natural gas in a ratio of 2:1.5, a deposition temperature of 930°C, a deposition time of 400 h, and a matrix density of 1.50 g / cm³. 3 .

[0091] Thus, the moving disc, components, pressure plate, clamping disc, and brake disc components were obtained. The experimental results are shown in Table 1.

[0092] Table 1. Performance Tables of Examples and Comparative Examples (Pressure Plate, Compression Plate, and Stationary Plate are the Same)

[0093]

[0094]

Claims

1. A carbon-ceramic brake disc assembly, characterized in that: It consists of n stationary disc assemblies, n+1 moving discs, 1 pressure plate, and 1 clamping plate; each stationary disc assembly consists of 2 stationary discs and a buffer disc sandwiched between the 2 stationary discs; the n stationary disc assemblies are located between the n+1 moving discs, and the pressure plate and clamping plate are located at both ends of the stationary disc assembly. The stationary disc, moving disc, pressure disc, and clamping disc all contain carbon fiber reinforcement, C matrix, and SiC matrix. In the moving disc, the mass fraction of C matrix is ​​28%~50%, and in the stationary disc, pressure disc, and clamping disc, the mass fraction of C matrix is ​​38%~55%. The buffer disc is a carbon-carbon composite material, and n is 1~3. In the moving disk, the carbon fiber reinforcement is a 2.5D needle-punched carbon fiber preform with a density of 0.47-0.53 g / cm³. 3 ; The moving disk also contains Ti3SiC2 dispersed in the SiC matrix; In the static plate, pressure plate, and clamping plate, the carbon fiber reinforcement is a three-layer prefabricated structure. The middle layer consists of layers of non-woven fabric and mesh in the XY direction, with 12-14 layers / cm² of non-woven fabric and mesh, and a bulk density of 0.47-0.53 g / cm³. 3 The thickness of both the upper and lower layers is 3-8mm, using short carbon fiber felt with a bulk density of 0.08-0.15g / cm³. 3 The short carbon fibers in the felt have a length of 60-90 mm.

2. The carbon ceramic brake disc assembly according to claim 1, characterized in that: The density of the buffer disk is 1.5-1.7 g / cm³. 3 The thickness is 5-15mm; The buffer plate and the stationary plate are connected by mortise and tenon joints; The density of the moving plate, stationary plate, pressure plate, and clamping plate is all 2.1-2.3 g / cm³. 3 .

3. A method for preparing a carbon-ceramic brake disc assembly according to claim 1 or 2, characterized in that: The moving plate, stationary plate, pressure plate, and clamping plate are prepared separately, and then assembled to obtain the final product. The preparation process of the moving plate is as follows: first, a 2.5D needle-punched carbon fiber preform is subjected to chemical vapor deposition of a carbon matrix until a density of 1.15-1.35 g / cm³ is obtained. 3 The carbon-carbon composite material A is obtained by heat-treating the carbon-carbon composite material A to obtain a carbon-carbon preform C, and then the carbon-carbon preform C is subjected to reactive molten silicon infiltration to obtain the final product. The preparation process of the static plate, the pressure plate, and the clamping plate is as follows: an intermediate layer is obtained by laminating non-woven fabric and mesh in the XY direction, and then short carbon fiber felt is laid on the upper and lower layers of the intermediate layer preform. Then, the three-layer structure preform is obtained by needle punching in the Z direction. The three-layer structure preform is then subjected to chemical vapor deposition to obtain a density of 1.4-1.65 g / cm³. 3 The carbon-carbon composite material B is obtained by heat treatment of the carbon-carbon composite material B to obtain carbon-carbon preform D, and finally carbon-carbon preform D is subjected to reactive molten silicon infiltration to obtain the final product.

4. The method for preparing a carbon ceramic brake disc assembly according to claim 3, characterized in that: In the fabrication of the moving disk, the needle density of the 2.5D needle-punched carbon fiber preform used is 30-50 needles / cm. 2 ; During the preparation of the moving disk, the carbon source gas used in chemical vapor deposition is a mixture of propane and natural gas, wherein the volume ratio of propane to natural gas is 1:1-5; the temperature of chemical vapor deposition is 900-1000℃ and the time is 200-300h.

5. The method for preparing a carbon ceramic brake disc assembly according to claim 3, characterized in that: During the preparation of the moving disk, the heat treatment temperature is 2000-2200℃ and the heat treatment time is 4-6h; During the preparation of the moving disk, the silicon infiltration powder used in the reaction molten silicon infiltration process is composed of silicon powder and TiC powder, with a mass ratio of silicon powder:TiC powder = 90-95: 5-10; the particle size of silicon powder is 50-200µm, the particle size of TiC powder is 10-100µm, and the particle size of TiC powder is less than that of silicon powder.

6. The method for preparing a carbon ceramic brake disc assembly according to claim 3, characterized in that: During the preparation of the moving disk, the temperature during the reaction molten silicon infiltration is 1500-1800℃ and the time is 3-6h; During the preparation of the static plate, pressure plate, and clamping plate, the needle density of the intermediate layer during Z-axis needle punching is 30-50 needles / cm. 2 The needle density in the upper and lower layers is 20-40 needles / cm. 2 The needle insertion depth was controlled between 1-5 mm. During the preparation of the static plate, pressure plate, and clamping plate, the carbon source gas used in chemical vapor deposition is a mixture of propane and natural gas, wherein the volume ratio of propane to natural gas is 2:1-3; the temperature of chemical vapor deposition is 900-950℃, and the time is 400-600h.

7. The method for preparing a carbon ceramic brake disc assembly according to claim 3, characterized in that: During the preparation of the static plate, the pressure plate, and the clamping plate, the heat treatment temperature is 2000-2200℃ and the heat treatment time is 4-6h. In the preparation process of the static plate, the pressure plate, and the clamping plate, the silicon infiltrated powder used is silicon powder with a particle size of 50-200µm, the reaction molten silicon infiltration temperature is 1500-1800℃, and the reaction molten silicon infiltration time is 3-6h.

8. The application of a carbon ceramic brake disc assembly according to claim 1 or 2, characterized in that: The carbon-ceramic material brake disc assembly is applied to an aircraft.

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