Mortise and tenon joint combined carbon ceramic brake disc and preparation method thereof

Abstract

The invention relates to a mortise and tenon joint combined carbon ceramic brake disc and a preparation method thereof.The mortise and tenon joint combined carbon ceramic brake disc comprises a first brake panel and a second brake panel, a plurality of first inserts and second inserts are arranged on the opposite faces of the first brake panel and the second brake panel in an annular array mode respectively, and the first inserts and the second inserts are connected through mortise and tenon joint structures; and the brake disc is formed through combination. Meanwhile, the invention provides a preparation method of the combined carbon-ceramic brake disc. When the first brake panel and the second brake panel generate the torsion action of relative rotation in the working process, the insert and the mortise serve as main bearing units of the torsion action force, the anti-shearing capacity is high, accurate positioning of the two brake surfaces can be achieved through mortise and tenon connection, the two brake surfaces can be rapidly assembled, and meanwhile, through structural disassembly, the assembly efficiency is greatly improved. The density uniformity of the product is improved, the dynamic balance performance of the carbon-ceramic brake disc is improved, the preparation period is shortened through the preparation method, and the qualified rate of the product is increased.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber toughened ceramic matrix composite material brake discs, and in particular to a combined carbon-ceramic brake disc with mortise and tenon joints and a preparation method thereof. Background Art

[0002] Continuous Fiber Reinforced Ceramic Matrix Composites (CFCC) inherits the excellent properties of ceramics such as low density, high strength, and oxidation resistance, and overcomes the weaknesses of ceramics such as high brittleness and poor reliability. It exhibits fracture behavior similar to that of metals, is insensitive to cracks, and is not prone to catastrophic fracture. It has great application potential in the field of friction braking. C / SiC composites have a series of excellent properties such as high specific strength, high specific modulus, high hardness, low density, low thermal and wet decay of friction coefficient, and are currently one of the most promising friction materials.

[0003] The preparation process of C / SiC composites can be divided into: gas phase route, also known as chemical vapor infiltration (CVI); liquid phase route, including polymer impregnation pyrolysis (PIP) and liquid silicon infiltration (LSI) or reactive melt infiltration process (RMI). The gas phase route can be used to continuously deposit different components of the composite material, namely the interface phase, matrix and outer coating, from a gaseous precursor under medium temperature, low pressure or atmospheric pressure of 900-1000°C. The initial material is an n (usually n=2 or 3)-dimensional porous fiber preform. During the preform densification process (CVI), the interface phase and SiC matrix are deposited on the fiber surface inside the pores of the preform. The CVI process is a mature process for preparing SiC-based composites, with the following outstanding advantages: strong practicality and low preparation temperature; effective realization of the composition design of composite materials at microscopic size; suitable for the preparation of products with high fiber volume fraction, complex shape, net size and wide size range; small damage to the fiber during the preparation process. The RMI process is a densification process that generates a matrix in situ through a chemical reaction, and the reaction products are usually carbides and borides. The principle is to introduce carbides and borides by reacting a high-temperature molten metal element or alloy mixture with a porous material containing carbon or boron. In the RMI process, no additional mechanical pressure is required. The molten metal or alloy spontaneously infiltrates into the preform under the action of capillary force and reacts with carbon or the introduced precursor to form a ceramic matrix. The carbon or precursor in the porous material can be derived from the preform matrix itself (such as C / C composite materials), or the carbon phase can be introduced into the porous preform through slurry infiltration or PIP. Compared with the CVI process, the RMI process has low preparation cost and short production cycle, and can realize the preparation of complex-shaped components; and the prepared material has low residual porosity and good density. However, the RMI process also has some disadvantages: during the infiltration reaction, if it is not protected, the carbon fiber will react with the infiltrated metal phase, corrode and damage the fiber, and affect the mechanical properties of the material. In addition, the unreacted metal remaining inside the material will accelerate creep at high temperatures, destroy phase stability and reduce material performance.

[0004] Traditional integral carbon ceramic brake discs have multiple ventilation grooves arranged circumferentially to reduce weight and dissipate heat. However, ventilation grooves cannot be processed when the density of the brake disc blank is low. Ventilation grooves can only be processed when the brake disc blank has a certain strength and processability. Moreover, the processing of ventilation grooves is time-consuming, and the removed materials are all scraps, resulting in a large waste of manpower, materials and time. At the same time, since the thickness of the integral carbon ceramic brake disc is relatively thick, generally 25~40mm, and there are different structures in the thickness direction of the carbon ceramic brake disc, such as mounting hole steps, ventilation grooves, etc., the melt penetration process is complicated and difficult to control, resulting in uneven density of the carbon ceramic brake disc blank after RMI modification, which will directly lead to excessive residual imbalance of the carbon ceramic brake disc and product scrapping.

[0005] In order to overcome the process disadvantages of the above-mentioned integral carbon-ceramic brake disc, a combined carbon-ceramic brake disc has been developed in the prior art. The combined carbon-ceramic brake disc is divided into two halves in the thickness direction, and the circumferential processing of the ventilation groove is changed to the milling processing in the plane of the single-side brake disc, which greatly shortens the processing time and reduces the processing difficulty; after processing, the two halves of the brake disc are riveted or screwed into a whole by mechanical connectors such as rivets and screws. Therefore, during the use of the combined carbon-ceramic brake disc, when the two halves of the brake disc generate a torsional load of relative rotation, the mechanical connector is the main load-bearing unit, and its shear strength directly determines the mechanical properties of the brake disc. However, due to the limited installation area on the brake disc, the diameter, number and arrangement of the mechanical connector are all limited. During use, once a rivet is damaged, the overall performance of the brake disc will be greatly reduced. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a combined carbon-ceramic brake disc with mortise and tenon joints and a preparation method thereof, which solves the problem of low shear strength of the existing combined carbon-ceramic brake disc connected by rivets or the like.

[0007] To achieve the above object, the technical solution adopted by the present invention is: A combined carbon-ceramic brake disc with mortise and tenon joints comprises a first brake panel and a second brake panel. On opposite surfaces of the first brake panel and the second brake panel, a plurality of first inserts and second inserts are arranged in a circular array, respectively. The first inserts and the second inserts are connected by a mortise and tenon structure to form the brake disc. A central hole for installing a joint is provided in the middle of the first brake panel.

[0008] In this solution, the first brake panel and the second brake panel are connected by a mortise and tenon structure. The brake disc connected by rivets can bear a higher shear force and has a strong shear resistance. The mortise and tenon connection method can also achieve precise positioning of the first brake panel and the second brake panel, allowing the two to be quickly assembled.

[0009] Furthermore, the mortise and tenon structure includes a mortise and tenon body, the number of which is equal to the number of the first insert and the second insert; the mortise and tenon body has a first mortise groove on one side corresponding to the first insert and a second mortise groove on one side corresponding to the second insert, the first insert is embedded in the first mortise groove, and the second insert is embedded in the second mortise groove; The width of the first tenon groove gradually decreases along the direction in which the first insert rotates into the first tenon groove, and the width of the second tenon groove gradually decreases along the direction in which the second insert rotates into the second tenon groove; the rotation direction of the first insert entering the first tenon groove is opposite to the rotation direction of the second insert entering the second tenon groove.

[0010] In this solution, the first insert and the second insert on the first brake panel and the second brake panel are respectively embedded in the first mortise and the second mortise on both sides of the mortise body. When the first brake panel and the second brake panel generate a relative rotational torsion during operation, the first insert and the first mortise, as well as the second insert and the second mortise are the main bearing units of the torsion force. Compared with the brake disc connected by rivets, it can bear a higher shearing effect and has a strong shearing resistance. Through the mortise and tenon structure connection, the first brake panel and the second brake panel can also be accurately positioned, so that the two can be quickly assembled. No rivets or bolts are needed for connection, and the assembly is convenient.

[0011] Furthermore, the groove walls on both sides of the first mortise and tenon grooves are inclined toward the bottom of the groove body, and the angle θ between the groove walls and the bottom of the groove body is in the range of 60 to 89 degrees.

[0012] Furthermore, the thickness of the combined carbon-ceramic brake disc is 20-48 mm and the outer diameter is 260-460 mm; the thickness of the mortise body is 1 / 6-1 / 2 of the thickness of the combined carbon-ceramic brake disc; the mortise depths of the first mortise and the second mortise are both 1 / 8-1 / 2 of the thickness of the mortise body.

[0013] Furthermore, the first brake panel is provided with mounting through holes having the same number as the tenon body, the tenon body is provided with bolt holes, and the first brake panel and the tenon body are connected via bolts penetrating the mounting through holes and the bolt holes.

[0014] In this solution, the first brake panel and a plurality of mortise and tenon bodies are connected as a whole by bolts, thereby enhancing the connection strength between the first brake panel and the mortise and tenon bodies.

[0015] In a second aspect, the present invention provides a method for preparing a combined carbon-ceramic brake disc with mortise and tenon joints based on the combined carbon-ceramic brake disc with mortise and tenon joints provided in the first aspect, comprising the following steps: S1: Preparation of three-dimensional needle-punched preform flat plate; S2: Preparation of pyrolytic carbon interface layer on the surface of three-dimensional needle-punched preform flat plate by CVI process; S3: Introducing carbon into the interior of the three-dimensional needle-punched preform flat plate using the PIP process; S4: machining the three-dimensional needle-punched preform flat plate after the carbon is introduced to obtain a first brake panel connected to the first insert, a second brake panel connected to the second insert, and a tongue-and-groove body; S5: rotating the first brake panel along the side of the mortise body with the first mortise, so that the first insert is embedded in the first mortise; rotating the second brake panel in the opposite direction along the side of the mortise body with the second mortise, so that the second insert is embedded in the second mortise, to obtain an assembly of the combined carbon-ceramic brake disc; S6: Perform RMI process on the assembly of the combined carbon-ceramic brake disc.

[0016] In this scheme, a CVI vapor deposition process is used to prepare a pyrolytic carbon interface layer, and then a PIP precursor impregnation and cracking process is used to introduce the resin into a porous three-dimensional needle-punched preform flat plate, and crack it to generate excess carbon; the processed first brake panel and the second brake panel are then riveted and assembled; finally, an RMI reaction is carried out to obtain a composite carbon-ceramic brake disc with a higher density.

[0017] Further, in S1, the carbon fiber non-woven fabric or carbon fiber mesh is prepared into a three-dimensional needle-punched preform flat plate by a needle-punching process, and the volume density of the three-dimensional needle-punched preform flat plate is 0.35~0.65g / cm 3 ; Among them, the fiber tow of carbon fiber non-woven fabric is 3000, 6000, 12000 or 24000; the density of carbon fiber mesh tire ranges from 25 to 80g / m 2 .

[0018] Furthermore, S2 includes: S201: placing a three-dimensional needle-punched preform flat plate in a furnace of a vacuum induction furnace; S202: Start the vacuum pump to evacuate the inside of the furnace. When the vacuum degree inside the furnace is ≤200Pa, start heating, and raise the temperature inside the furnace from room temperature to 700~900℃ at a rate of 3~5℃ / min; S203: Propylene, hydrogen and argon are introduced into the furnace at a gas flow ratio of 1:3:3, and the temperature is kept for 100 to 200 hours, so that the propylene gas is thermally decomposed and a pyrolytic carbon interface layer is deposited on the surface of the three-dimensional needle-punched preform flat plate; S204: After the heat preservation is completed, the temperature starts to be lowered to reduce the temperature inside the furnace to room temperature.

[0019] In this scheme, the three-dimensional needle-punched preform flat plate material is densified by using the CVI process through high-temperature decomposition and polycondensation of hydrocarbon gas compounds to deposit carbon inside the porous medium.

[0020] Furthermore, S3 includes: S301: placing the three-dimensional needle-punched preform flat plate in an impregnation tank; starting the vacuum pump to evacuate the inside of the impregnation tank, and when the air pressure inside the impregnation tank reaches -0.5~-0.1MPa, maintaining the pressure for 30 minutes; S302: After the pressure holding is completed, the negative pressure inside the impregnation tank is used to suck the resin slurry into the impregnation tank; after the resin slurry submerges the three-dimensional needle-punched preform flat plate, the inside of the impregnation tank begins to be pressurized, and when the air pressure inside the impregnation tank reaches 1.0~3.0MPa, the pressure is maintained at this pressure for 30 minutes, so that the resin slurry enters the inside of the three-dimensional needle-punched preform flat plate, and is cracked into carbon inside the three-dimensional needle-punched preform flat plate; after the pressure holding is completed, the normal pressure is restored, and the three-dimensional needle-punched preform flat plate is taken out of the impregnation tank; S303: placing the three-dimensional needle-punched preform flat plate into an oven at a temperature of 80-250° for curing; S304: After curing, the three-dimensional needle-punched preform flat plate is sent into the furnace of the vacuum induction furnace; the vacuum pump is started to evacuate the inside of the furnace, and when the vacuum degree inside the furnace is ≤200Pa, the temperature is increased from room temperature to 700~900℃ at a rate of 3~5℃ / min, and the temperature is kept at this temperature for 2~4h; after the insulation is completed, the temperature is lowered to reduce the temperature inside the furnace to room temperature.

[0021] Furthermore, S6 specifically includes: S601: placing the assembly of the combined carbon-ceramic brake disc into a graphite crucible, adding silicon powder into the graphite crucible; and then placing the graphite crucible into the furnace of a vacuum induction furnace; S602: Start the vacuum pump to evacuate the inside of the furnace. When the vacuum degree inside the furnace is ≤200Pa, start heating the furnace from room temperature to 1400±50℃ at a rate of 3~5℃ / min, and keep it at this temperature for 1h; S603: Raise the internal temperature of the furnace to 1500°C at a rate of 2-3°C / min, and keep it at 1500°C for 1 hour; S604: Continue to increase the temperature inside the furnace from 1500°C to 1600°C at a rate of 2-3°C / min, and keep it at 1600°C for 0.5-1h; after keeping it, lower the temperature inside the furnace to room temperature, take out the graphite crucible, and obtain a combined carbon-ceramic brake disc.

[0022] In this solution, molten silicon is introduced into the interior of the combined carbon-ceramic brake disc material to obtain a high-density combined carbon-ceramic brake disc, which can better exert the load-bearing capacity of the carbon fibers inside it.

[0023] The beneficial effects of the present invention are: 1. The combined carbon-ceramic brake disc provided by the present invention is designed with a first brake panel and a second brake panel that are processed separately. After the two are connected by a mortise and tenon structure, ventilation gaps are naturally formed in their circumferential direction, which solves the problem that the ventilation grooves of the traditional integral carbon-ceramic brake disc are time-consuming, labor-intensive, and material-intensive. In the present invention, the traditional thick integral carbon-ceramic brake disc is disassembled into multiple parts, which not only improves the utilization rate of materials, but also each part can be prepared separately in large quantities, which is suitable for mass production; and reduces the process difficulty such as the uneven density of the matrix carbon caused by the thickness of the preform and the uneven density of the ceramic phase after high-temperature modification during preparation.

[0024] Before assembly, the quality of each tenon body can be screened to control the quality fluctuation range of the tenon body, ensuring that each tenon body has good quality consistency before assembly, thereby improving the uniformity of the finished carbon-ceramic brake disc, and then improving the dynamic balance performance of the finished carbon-ceramic brake disc, effectively reducing the problem of excessive dynamic imbalance caused by excessive weight of the finished carbon-ceramic brake disc, reducing the processing volume of dynamic balancing and deweighting, saving material and processing costs, shortening the preparation cycle, and improving the first-time qualified rate of the product.

[0025] 2. The first brake panel and the second brake panel are connected by a mortise and tenon structure. Compared with the brake disc connected by rivets, the force-bearing unit is improved from rivets to a reliable mortise and tenon structure, which gives full play to the advantages of high hardness and pressure resistance of ceramics, improves the connection reliability of the combined brake disc, and improves the shear resistance of the combined carbon-ceramic brake disc.

[0026] 3. The first and second tenons on both sides of the tenon body in the tenon-and-mortise structure have opposite screw-in closing directions, with a larger cross section on the outer side of the tenon and a smaller cross section on the inner side of the groove, thereby ensuring that the first brake panel and the second brake panel can be assembled by rotation, with reliable positioning and simple operation. The side and bottom surfaces of the first and second tenons are at an acute angle, which ensures that the two brake surfaces will not separate or fall off after connection, and can meet the requirements of subsequent processes and product use.

[0027] 4. The preparation method of the combined carbon-ceramic brake disc provided by the present invention adopts a CVI vapor deposition process to prepare a porous three-dimensional needle-punched preform flat plate material with a certain density, and then adopts a PIP precursor impregnation and cracking process to introduce resin into the three-dimensional needle-punched preform flat plate to crack and generate excess carbon, and finally an RMI reaction is performed to introduce molten silicon melt into the three-dimensional needle-punched preform flat plate material to obtain a combined carbon-ceramic brake disc with higher density. The pre-deposited PyC matrix can effectively protect the carbon fiber by PyC. The carbon fiber will not be corroded by the Si melt during the RMI reaction, and the bearing capacity of the carbon fiber can be better exerted. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a combined carbon-ceramic brake disc with mortise and tenon joints according to the present invention; Figure 2 An exploded view of a combined carbon-ceramic brake disc connected with mortise and tenon joints according to the present invention; Figure 3 It is a schematic cross-sectional structure diagram of a combined carbon-ceramic brake disc with mortise and tenon joints according to the present invention; Figure 4 It is a schematic diagram of the structure of the tenon and groove body of the present invention; Figure 5 This is a schematic structural diagram of the first brake panel of the present invention; Figure 6 This is a schematic diagram of the structure of the second brake panel of the present invention; Figure 7 It is a schematic diagram of the assembly structure of the first brake panel and the tenon-groove body of the present invention.

[0029] In the figure: 1, first brake panel; 11, mounting through hole; 2, second brake panel; 3, mortise and tenon body; 31, first mortise and tenon; 32, second mortise and tenon; 33, bolt hole; 4, first insert; 5, second insert. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings; the examples given are only used to explain the present invention; they are not used to limit the scope of the present invention.

[0031] Embodiment 1: A combined carbon-ceramic brake disc with mortise and tenon joints comprises a first brake panel 1 and a second brake panel 2. On opposite surfaces of the first brake panel 1 and the second brake panel 2, a plurality of first inserts 4 and second inserts 5 are arranged in a circular array, respectively. The first inserts 4 and the second inserts 5 are connected by a mortise and tenon structure to form a brake disc. A central hole for installing a joint is provided in the middle of the first brake panel 1.

[0032] The mortise and tenon structure includes a mortise and tenon body 3, the number of which is equal to the number of the first inserts 4 and the second inserts 5; the mortise and tenon body 3 has a first mortise and tenon groove 31 on one side corresponding to the first insert 4 and a second mortise and tenon groove 32 on one side corresponding to the second insert 5, the first insert 4 is embedded in the first mortise and tenon groove 31, and the second insert 5 is embedded in the second mortise and tenon groove 32; The width of the first tenon groove 31 gradually decreases along the direction in which the first insert 4 rotates into the first tenon groove 31, and the width of the second tenon groove 32 gradually decreases along the direction in which the second insert 5 rotates into the second tenon groove 32; the rotation direction of the first insert 4 entering the first tenon groove 31 is opposite to the rotation direction of the second insert 5 entering the second tenon groove 32.

[0033] The groove walls on both sides of the first groove 31 and the second groove 32 are inclined toward the bottom of the groove body, and the angle θ between the groove wall and the bottom of the groove body is 60-89°.

[0034] The thickness of the combined carbon-ceramic brake disc is 20-48 mm and the outer diameter is 260-460 mm; the thickness of the tenon body 3 is 1 / 6-1 / 2 of the thickness of the combined carbon-ceramic brake disc; the tenon depths of the first tenon 31 and the second tenon 32 are both 1 / 8-1 / 2 of the thickness of the tenon body 3.

[0035] The first brake panel 1 is provided with mounting through holes 11 having the same number as the tenon groove body 3 , and the tenon groove body 3 is provided with bolt holes 33 . The first brake panel 1 is connected to the tenon groove body 3 via bolts penetrating the mounting through holes 11 and the bolt holes 33 .

[0036] As a preference of this embodiment, the number of the mortise and tenon bodies 3, the first inserts 4 and the second inserts 5 are all 4 to 20.

[0037] Embodiment 2: like Figure 1-7 As shown, this embodiment provides a method for preparing a combined carbon-ceramic brake disc with mortise and tenon joints based on the combined carbon-ceramic brake disc with mortise and tenon joints provided in Embodiment 1, comprising the following steps: S1: Preparation of three-dimensional needle-punched preform flat plate; The carbon fiber non-woven fabric or carbon fiber mesh is prepared into a three-dimensional needle-punched preform flat plate by a needle-punching process. The volume density of the three-dimensional needle-punched preform flat plate ranges from 0.35 to 0.65 g / cm 3 ; The fiber tows of carbon fiber non-woven fabric are 3000, 6000, 12000 or 24000; The density of carbon fiber mesh tire ranges from 25 to 80g / m 2 .

[0038] S2: Using CVI process to prepare pyrolytic carbon interface layer on the surface of three-dimensional needle-punched preform flat plate; specifically including: S201: placing a three-dimensional needle-punched preform flat plate on the chassis of the vacuum induction furnace, and sending the flat plate into the furnace through a lifting platform; S202: Start the vacuum pump to evacuate the inside of the furnace. When the vacuum degree inside the furnace is ≤200Pa, start the power supply and start heating. Raise the temperature inside the furnace from room temperature to 700~900℃ at a rate of 3~5℃ / min. S203: Propylene, hydrogen and argon are introduced into the furnace at a gas flow ratio of 1:3:3, and the temperature is kept for 100 to 200 hours, so that the propylene gas is thermally decomposed and a pyrolytic carbon interface layer is deposited on the surface of the three-dimensional needle-punched preform flat plate; S204: After the heat preservation is completed, the power is turned off and the temperature is lowered to reduce the temperature inside the furnace to room temperature.

[0039] S3: Introducing carbon into the interior of the three-dimensional needle-punched preform flat plate using the PIP process; specifically including: S301: placing the three-dimensional needle-punched preform flat plate in the bottom tray of the impregnation tank and closing the tank door; starting the vacuum pump to evacuate the inside of the impregnation tank, and when the air pressure inside the impregnation tank reaches -0.5~-0.1MPa, maintaining the pressure at this pressure for 30 minutes; S302: After the pressure holding is completed, the negative pressure inside the impregnation tank is used to suck the resin slurry into the impregnation tank; after the resin slurry submerges the three-dimensional needle-punched preform flat plate, the inside of the impregnation tank begins to be pressurized, and when the air pressure inside the impregnation tank reaches 1.0-3.0 MPa, the pressure is maintained for 30 minutes at this air pressure, so that the resin slurry enters the inside of the three-dimensional needle-punched preform flat plate, and is cracked into carbon inside the three-dimensional needle-punched preform flat plate; after the pressure holding is completed, the normal pressure is restored, and the three-dimensional needle-punched preform flat plate is taken out of the impregnation tank; The resin slurry is made by mixing a resin and a resin dispersing agent; wherein the resin includes but is not limited to phenolic resin, epoxy resin, polyester resin, furan resin, furfural resin and a combination of resins; the resin dispersing solvent includes but is not limited to methanol, ethanol, acetone and a mixed solvent thereof; the mass fraction of the resin slurry ranges from 30% to 60%; S303: placing the three-dimensional needle-punched preform flat plate into an oven at a temperature of 80-250° for curing; S304: After curing, place the three-dimensional needle-punched preform flat plate on the bottom plate of the vacuum induction furnace, and use the lifting platform to send the flat plate into the furnace; start the vacuum pump to evacuate the inside of the furnace, and when the vacuum degree inside the furnace is ≤200Pa, start the power supply and start heating, and increase the temperature inside the furnace from room temperature to 700~900℃ at a rate of 3~5℃ / min, and keep it at this temperature for 2~4h; after the insulation is completed, start cooling, so that the temperature inside the furnace drops to room temperature, and take out the three-dimensional needle-punched preform flat plate.

[0040] S4: Mechanically process the three-dimensional needle-punched preform flat plate after the introduction of carbon to obtain a first brake panel 1 connected with a first insert 4, a second brake panel 2 connected with a second insert 5, and a tongue and groove body 3.

[0041] S5: Rotate the side of the first brake panel 1 with the first insert 4 along the side of the mortise and tenon body 3 with the first mortise and tenon groove 31, so that the first insert 4 is embedded in the first mortise and tenon groove 31; Figure 7 , Figure 7 The first brake panel 1 is rotated counterclockwise to fit the first insert 4 into the first mortise and tenon groove 31; The second brake panel 2 with the second insert 5 is rotated in the opposite direction to the second tenon groove 32 of the tenon groove body 3, so that the second insert 5 is embedded in the second tenon groove 32; Figure 7 On the basis of the mortise and tenon body 3 shown in the figure, the second brake panel 2 is rotated clockwise to allow the second insert 5 to be embedded in the second mortise and tenon groove 32. Figure 7 The second brake panel 2 is not shown.

[0042] S6: Perform RMI process on the assembly of the combined carbon-ceramic brake disc, including: S601: Place the assembled carbon ceramic brake disc into a graphite crucible, add silicon powder into the graphite crucible; then place the graphite crucible on the bottom plate of the vacuum induction furnace, and use a lifting platform to send the preform and the crucible into the furnace; the purity of the silicon powder ranges from 98 to 99.9%, and the mesh ranges from 60 to 500 meshes; S602: Start the vacuum pump to evacuate the inside of the furnace. When the vacuum degree inside the furnace is ≤200Pa, start the power supply and start heating. Raise the temperature inside the furnace from room temperature to 1400±50℃ at a rate of 3~5℃ / min, and keep it at this temperature for 1h. S603: Raise the internal temperature of the furnace to 1500°C at a rate of 2-3°C / min, and keep it at 1500°C for 1 hour; S604: Continue to increase the temperature inside the furnace from 1500°C to 1600°C at a rate of 2-3°C / min, and keep it at 1600°C for 0.5-1h; after the insulation is completed, turn off the power, cool the temperature inside the furnace to room temperature, and take out the graphite crucible; obtain a combined carbon-ceramic brake disc.

[0043] S7: performing size finishing on the combined carbon-ceramic brake disc to obtain a combined carbon-ceramic brake disc product.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined carbon-ceramic brake disc with mortise and tenon joints, characterized in that: The invention comprises a first brake panel (1) and a second brake panel (2). On the opposite surfaces of the first brake panel (1) and the second brake panel (2), a plurality of first inserts (4) and second inserts (5) are arranged in a circular array, respectively. The first inserts (4) and the second inserts (5) are connected by a mortise and tenon structure to form the brake disc. A central hole for mounting a joint is provided in the middle of the first brake panel (1).

2. The mortise and tenon jointed combined carbon-ceramic brake disc according to claim 1, characterized in that: The mortise and tenon structure comprises a mortise and tenon body (3), the number of the mortise and tenon bodies (3) being equal to the number of the first inserts (4) and the second inserts (5); the mortise and tenon body (3) is provided with a first mortise and tenon groove (31) on a side corresponding to the first insert (4), and a second mortise and tenon groove (32) on a side corresponding to the second insert (5); the first insert (4) is embedded in the first mortise and tenon groove (31), and the second insert (5) is embedded in the second mortise and tenon groove (32); The width of the first tenon groove (31) gradually decreases in the direction in which the first insert (4) rotates to enter the first tenon groove (31), and the width of the second tenon groove (32) gradually decreases in the direction in which the second insert (5) rotates to enter the second tenon groove (32); the rotation direction in which the first insert (4) enters the first tenon groove (31) is opposite to the rotation direction in which the second insert (5) enters the second tenon groove (32).

3. The mortise and tenon jointed combined carbon-ceramic brake disc according to claim 2, characterized in that: The groove walls on both sides of the first tenon groove (31) and the second tenon groove (32) are inclined toward the bottom of the groove body, and the angle θ between the groove wall and the bottom of the groove body is 60-89°.

4. The mortise and tenon jointed combined carbon-ceramic brake disc according to claim 2, characterized in that: The thickness of the combined carbon-ceramic brake disc is 20-48 mm, and the outer diameter is 260-460 mm; the thickness of the tenon body (3) is 1 / 6-1 / 2 of the thickness of the brake disc; and the tenon depths of the first tenon (31) and the second tenon (32) are both 1 / 8-1 / 2 of the thickness of the tenon body (3).

5. The combined carbon-ceramic brake disc with mortise and tenon joints according to claim 2 is characterized in that: The first brake panel (1) is provided with mounting through holes (11) having the same number as the tenon groove body (3), the tenon groove body (3) is provided with bolt holes (33), and the first brake panel (1) and the tenon groove body (3) are connected via bolts penetrating the mounting through holes (11) and the bolt holes (33).

6. A method for preparing a combined carbon-ceramic brake disc with mortise and tenon joints according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Preparation of three-dimensional needle-punched preform flat plate; S2: Preparation of pyrolytic carbon interface layer on the surface of three-dimensional needle-punched preform flat plate by chemical vapor infiltration process; S3: Introducing carbon inside the three-dimensional needle-punched preform flat sheet using a polymer impregnation pyrolysis process; S4: mechanically processing the three-dimensional needle-punched preform flat plate after the introduction of carbon to obtain a first brake panel (1) connected to a first insert (4), a second brake panel (2) connected to a second insert (5), and a tongue and groove body (3); S5: rotating the first brake panel (1) along the side of the tenon body (3) having the first tenon groove (31) so that the first insert (4) is embedded in the first tenon groove (31); rotating the second brake panel (2) in the opposite direction along the side of the tenon body (3) having the second tenon groove (32) so that the second insert (5) is embedded in the second tenon groove (32), thereby obtaining an assembly of a combined carbon-ceramic brake disc; S6: The assembly of the modular carbon-ceramic brake disc is subjected to a reactive melt infiltration process.

7. The method for preparing a combined carbon-ceramic brake disc with mortise and tenon joints according to claim 6, characterized in that: In S1, the carbon fiber non-woven fabric or carbon fiber mesh is prepared into a three-dimensional needle-punched preform flat plate by a needle-punching process, and the volume density of the three-dimensional needle-punched preform flat plate is 0.35-0.65 g / cm 3 ; Among them, the fiber tow of carbon fiber non-woven fabric is 3000, 6000, 12000 or 24000; the density of carbon fiber mesh is 25~80g / m 2 .

8. The method for preparing the combined carbon-ceramic brake disc with mortise and tenon joints according to claim 6, characterized in that: The S2 includes: S201: placing a three-dimensional needle-punched preform flat plate in a furnace of a vacuum induction furnace; S202: Start the vacuum pump to evacuate the inside of the furnace. When the vacuum degree inside the furnace is ≤200Pa, start heating, and raise the temperature inside the furnace from room temperature to 700~900℃ at a rate of 3~5℃ / min; S203: Propylene, hydrogen and argon are introduced into the furnace at a gas flow ratio of 1:3:3, and the temperature is kept for 100 to 200 hours, so that the propylene gas is thermally decomposed and a pyrolytic carbon interface layer is deposited on the surface of the three-dimensional needle-punched preform flat plate; S204: After the heat preservation is completed, the temperature starts to be lowered to reduce the temperature inside the furnace to room temperature.

9. The method for preparing the combined carbon-ceramic brake disc with mortise and tenon joints according to claim 6, characterized in that: The S3 includes: S301: placing the three-dimensional needle-punched preform flat plate in an impregnation tank; starting the vacuum pump to evacuate the inside of the impregnation tank, and when the air pressure inside the impregnation tank reaches -0.5~-0.1MPa, maintaining the pressure at this pressure for 30 minutes; S302: After the pressure holding is completed, the negative pressure inside the impregnation tank is used to suck the resin slurry into the impregnation tank; after the resin slurry submerges the three-dimensional needle-punched preform flat plate, the inside of the impregnation tank begins to be pressurized, and when the air pressure inside the impregnation tank reaches 1.0~3.0MPa, the pressure is maintained at this pressure for 30 minutes, so that the resin slurry enters the inside of the three-dimensional needle-punched preform flat plate, and is cracked into carbon inside the three-dimensional needle-punched preform flat plate; after the pressure holding is completed, the normal pressure is restored, and the three-dimensional needle-punched preform flat plate is taken out of the impregnation tank; S303: placing the three-dimensional needle-punched preform flat plate into an oven at a temperature of 80-250° for curing; S304: After curing, the three-dimensional needle-punched preform flat plate is sent into the furnace of the vacuum induction furnace; the vacuum pump is started to evacuate the inside of the furnace, and when the vacuum degree inside the furnace is ≤200Pa, the temperature is increased from room temperature to 700~900℃ at a rate of 3~5℃ / min, and the temperature is kept at this temperature for 2~4h; after the insulation is completed, the temperature is lowered to reduce the temperature inside the furnace to room temperature.

10. The method for preparing a combined carbon-ceramic brake disc with mortise and tenon joints according to any one of claims 6 to 9, characterized in that: The S6 includes: S601: placing the assembly of the combined carbon-ceramic brake disc into a graphite crucible, adding silicon powder into the graphite crucible; and then placing the graphite crucible into the furnace of a vacuum induction furnace; S602: Start the vacuum pump to evacuate the inside of the furnace. When the vacuum degree inside the furnace is ≤200Pa, start heating the furnace from room temperature to 1400±50℃ at a rate of 3~5℃ / min, and keep it at this temperature for 1h; S603: Raise the internal temperature of the furnace to 1500°C at a rate of 2-3°C / min, and keep it at 1500°C for 1 hour; S604: Continue to increase the internal temperature of the furnace from 1500°C to 1600°C at a rate of 2-3°C / min, and keep it at 1600°C for 0.5-1h; After heat preservation, the temperature inside the furnace is lowered to room temperature, and the graphite crucible is taken out to obtain a combined carbon-ceramic brake disc.

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