Brake disc and its preparation method and traffic equipment

Abstract

The present invention relates to a brake disc, a preparation method thereof and traffic equipment. The brake disc comprises: a loading disc, the loading disc having a first rotor mounting hole, a surface of the loading disc being provided with a plurality of protrusions in sequence around the first rotor mounting hole, the other surface of the loading disc also being provided with the protrusions at positions corresponding to the protrusions, each of the protrusions being provided with a first loading hole; at least two friction discs, the friction disc having a second rotor mounting hole for communicating with the first rotor mounting hole, the friction disc being provided with a second loading hole corresponding to the first loading hole, at least one friction disc being provided on each of the two surfaces of the loading disc; and a plurality of connecting members, each of the connecting members being used to cooperate with the first loading hole and the second loading hole corresponding to each other, so as to connect the loading disc with each of the friction discs. The brake disc is a split structure, which is convenient for processing and reduces the processing difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of transportation, and in particular to a brake disc and a preparation method thereof, and transportation equipment. Background Art

[0002] Brake discs used in transportation equipment such as cars, trains and airplanes are mostly made of stainless steel. Brake discs made of stainless steel are not only heavy and energy-consuming, but also produce thermal decay at high temperatures, resulting in reduced braking effect, deformation of the brake discs, and even brake failure in severe cases. With the increase in the speed of high-speed trains and the improvement in the performance of cars, the performance requirements for brake discs are also getting higher and higher. At present, brake discs made of carbon ceramic have begun to be used in high-end cars, high-speed trains and airplanes. Not only are they one-third the weight of stainless steel, they are also resistant to high temperatures and are not prone to thermal decay problems.

[0003] The general preparation process of carbon ceramic brake discs is to use carbon fiber to prepare a brake disc preform, then densify and initially process it to obtain a carbon / carbon rough blank, and finally introduce silicon carbide through a melt infiltration process or a PIP process (precursor impregnation and cracking process) to form a carbon ceramic brake disc. However, due to the thickness of the brake disc itself, the densification process and the subsequent introduction of silicon carbide cannot accurately control the amount of introduction, resulting in the brake disc product being unable to obtain stable friction performance. The friction performance of the brake disc is related to the entire driving safety, so the large-scale application of carbon ceramic brake discs is limited. Summary of the invention

[0004] Based on this, it is necessary to provide a brake disc that is easy to process and reduces the difficulty of processing.

[0005] In addition, a method for preparing a brake disc and traffic equipment containing the brake disc are also provided.

[0006] One aspect of the present invention provides a brake disc, comprising:

[0007] A loading plate, the loading plate having a first rotor mounting hole, a surface of the loading plate being provided with a plurality of protrusions in sequence around the first rotor mounting hole, and another surface of the loading plate being provided with the protrusions at positions corresponding to the protrusions, each of the protrusions being provided with a first loading hole;

[0008] at least two friction discs, each of which has a second rotor mounting hole for communicating with the first rotor mounting hole, each of which is provided with a second loading hole for corresponding to the first loading hole, and each of which has at least one friction disc on both surfaces; and

[0009] A plurality of connecting members, each of which is used to cooperate with the first loading holes and the second loading holes that are arranged in a one-to-one correspondence, so as to connect the loading disk and each of the friction disks.

[0010] In some embodiments, the loading tray is a carbon-carbon loading tray; and / or

[0011] The friction disc is a carbon-ceramic friction disc.

[0012] In some embodiments, the density of the loading disk is 1.1 g / cm 3 ~1.35g / cm 3 ;

[0013] The density of the friction disc is 2.0 g / cm 3 ~2.3g / cm 3 , the friction coefficient is between 3.5 and 4.2.

[0014] In some embodiments, the protrusion extends from an edge of the first rotor mounting hole to an outer edge of the loading tray along a radial direction on the loading tray.

[0015] In some embodiments, the loading tray is provided with ventilation holes in a region between two adjacent protrusions.

[0016] In some embodiments, when the loading plate is connected to each of the friction plates, at least a region of the loading plate is exposed to the second rotor mounting hole;

[0017] The ventilation hole is provided on a region of the loading plate exposed to the second rotor mounting hole.

[0018] In some embodiments, the first rotor mounting hole is a circular hole;

[0019] The second rotor mounting hole has multiple minimum inner diameters, and the multiple minimum inner diameters are the same as the inner diameter of the first rotor mounting hole. A semicircular hole is formed outward between two adjacent minimum inner diameters, and the area where the semicircular hole is located corresponds to the area of ​​the loading plate exposed to the second rotor mounting hole.

[0020] Another aspect of the present invention provides a method for preparing a brake disc, wherein the brake disc is any one of the brake discs described above, comprising the following steps:

[0021] preparing the loading disc and at least two friction discs;

[0022] At least one friction disk is respectively arranged on the two surfaces of the loading disk;

[0023] Each of the connecting members is matched with the first loading hole and the second loading hole which are arranged in a one-to-one correspondence, so as to connect the loading disk and each of the friction disks.

[0024] In some embodiments, the loading tray is a carbon-carbon loading tray; the preparation of the loading tray comprises the following steps:

[0025] Needle-punching the carbon fiber cloth and the carbon fiber web colloid to obtain a carbon fiber preform having the first rotor mounting hole;

[0026] The carbon fiber preform is subjected to carbon-carbon densification by chemical vapor deposition to obtain a carbon-carbon rough blank;

[0027] Processing the carbon-carbon rough blank and forming the first loading hole to obtain the loading tray;

[0028] And / or, the friction disc is a carbon ceramic friction disc; the preparation of the friction disc comprises the following steps:

[0029] Needle-punching the carbon fiber cloth and the carbon fiber web colloid to obtain a carbon fiber preform having the second rotor mounting hole;

[0030] The carbon fiber preform is subjected to carbon-carbon densification by chemical vapor deposition to obtain a carbon-carbon rough blank;

[0031] The carbon-carbon rough blank is graphitized and melt-siliconized to obtain a carbon ceramic rough blank;

[0032] The carbon ceramic blank is processed and the second loading hole is formed to obtain the friction disc.

[0033] Another aspect of the present invention provides a transportation device, comprising a wheel hub, a rotor and a brake disc as described above, wherein the rotor is installed in the first rotor mounting hole and the second rotor mounting hole and connected to the loading disc, and the wheel hub is connected to the rotor.

[0034] When the above-mentioned brake disc is assembled, at least one friction disc is respectively arranged on the two surfaces of the loading disc, and the first rotor mounting hole is connected to the second rotor mounting hole, and the first loading hole and the second loading hole are arranged in one-to-one correspondence, and then the loading disc and the friction discs are connected by each connecting piece cooperating with the first loading hole and the second loading hole arranged in one-to-one correspondence; the connection is firm to avoid the risk of falling off.

[0035] The above-mentioned brake disc is a split structure, and the friction disc and the loading disc can be processed separately, which is convenient for processing, reduces the processing difficulty, avoids the problem of poor performance stability caused by overall processing, and thus improves the stability and controllability of the brake disc performance, which is conducive to large-scale production and preparation; it is also convenient to replace the disc separately according to the use of the friction disc, without replacing the entire brake disc, saving energy, reducing solid waste, and improving the utilization rate of the brake disc. In addition, friction discs are arranged on both surfaces of the loading disc according to the use function of the brake disc, which is also convenient for individual optimization of friction discs with higher material requirements. In addition, the setting of the raised part on the loading disc can facilitate heat dissipation and ventilation between the loading disc and the friction disc, ensuring the excellent performance of the brake disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a brake disc according to an embodiment of the present invention;

[0037] Figure 2 for Figure 1 A top view of the brake disc shown;

[0038] Figure 3 for Figure 1 A schematic diagram of the structure of the loading disc in the brake disc shown;

[0039] Figure 4 for Figure 1 A schematic diagram of the structure of the friction disc in the brake disc shown;

[0040] Figure 5 The force-displacement curves are obtained by performing shear strength tests on the brake discs prepared in various embodiments and comparative examples.

[0041] Description of reference numerals:

[0042] 10: brake disc; 110: loading disc;

[0043] 120: friction disc; 112: raised portion;

[0044] 101: first rotor mounting hole; 102: first loading hole;

[0045] 103: second rotor mounting hole; 104: second loading hole;

[0046] 105: Ventilation holes. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0049] See also Figure 1 An embodiment of the present invention provides a traffic device and a brake disc 10 thereof. The traffic device comprises a wheel hub, a rotor and a brake disc 10.

[0050] An embodiment of the present invention provides a brake disc 10 and a method for manufacturing the same. The structure of the brake disc 10 will be described in detail below in conjunction with the method for manufacturing the same. Figure 1 and Figure 2 The brake disc 10 includes: a loading disc 110, at least two friction discs 120 and a plurality of connecting parts (not shown).

[0051] See also Figure 1 and Figure 3 The loading plate 110 has a first rotor mounting hole 101. A plurality of protrusions 112 are sequentially arranged on one surface of the loading plate 110 around the first rotor mounting hole 101, and protrusions 112 are also arranged on the other surface of the loading plate 110 at corresponding positions of the protrusions 112, and each protrusion 112 is provided with a first loading hole 102.

[0052] See also Figure 4 The friction disc 120 has a second rotor mounting hole 103 for communicating with the first rotor mounting hole 101. The friction disc 120 is provided with a second loading hole 104 for one-to-one correspondence with the first loading hole 102. At least one friction disc 120 is respectively provided on both surfaces of the loading disc 110.

[0053] Each connecting member is used to cooperate with the first loading holes 102 and the second loading holes 104 which are arranged in a one-to-one correspondence, so as to connect the loading disk 110 and each friction disk 120 .

[0054] The present invention distinguishes the use functions of the brake disc 10 and sets the brake disc 10 as a split structure of a friction disc 120 and a loading disc 110. The upper and lower surfaces of the brake disc 10 are respectively the friction disc 120, and the middle is the loading disc 110. The loading disc 110 plays the role of docking with the wheel hub and fixing the friction disc 120. Specifically, the rotor is installed in the first rotor mounting hole 101 and the second rotor mounting hole 103 and connected to the loading disc 110, and the wheel hub is connected to the rotor, so that the loading disc 110 is docked with the wheel hub. It is understandable that the traffic equipment also includes a brake caliper, which is used to clamp the brake disc 10 to generate braking force. It is understandable that the traffic equipment also includes other components, which will not be repeated here.

[0055] Specifically, when the above-mentioned brake disc 10 is assembled, at least one friction disc 120 is respectively arranged on the two surfaces of the loading disc 110, and the first rotor mounting hole 101 is connected to the second rotor mounting hole 103, and the first loading hole 102 and the second loading hole 104 are arranged in one-to-one correspondence, and then the loading disc 110 and the friction discs 120 are connected by each connecting piece in cooperation with the first loading hole 102 and the second loading hole 104 arranged in one-to-one correspondence; the connection is firm to avoid the risk of falling off.

[0056] The above-mentioned brake disc 10 is a split structure, and the friction disc 120 and the loading disc 110 can be processed separately, which is convenient for processing, reduces the processing difficulty, avoids the problem of poor performance stability caused by overall processing, and thus improves the stability and controllability of the performance of the brake disc 10, which is conducive to large-scale production and preparation; it is also convenient to replace the friction disc 120 separately according to the use of the friction disc 120, without replacing the entire brake disc 10, saving energy, reducing solid waste, and improving the utilization rate of the brake disc 10. In addition, according to the use function of the brake disc 10, the friction disc 120 is arranged on both surfaces of the loading disc 110, which is also convenient for the separate optimization of the friction disc 120 with higher material requirements. In addition, the setting of the protrusion 112 on the loading disc 110 can facilitate the heat dissipation and ventilation between the loading disc 110 and the friction disc 120, and ensure the excellent performance of the brake disc 10.

[0057] The method for preparing the brake disc 10 includes the following steps S10 to S30.

[0058] S10: preparing a loading disc 110 and at least two friction discs 120.

[0059] S20 : ​​at least one friction plate 120 is disposed on both surfaces of the loading plate 110 .

[0060] S30 : Matching each connecting member with the first loading hole 102 and the second loading hole 104 which are arranged in a one-to-one correspondence, so as to connect the loading plate 110 and each friction plate 120 .

[0061] In some embodiments, the loading disc 110 is a carbon-carbon loading disc; and / or the friction disc 120 is a carbon-ceramic friction disc. Although the integral carbon-ceramic brake disc 10 has advantages in mechanical properties, the brake disc 10 is mainly subjected to shear force during use. The split or combined brake disc 10 of the present invention can fully meet the use requirements and can greatly reduce the processing difficulty and manufacturing cost.

[0062] Considering the use function of the brake disc 10, the friction disc 120 disposed on the outside is subject to greater wear, so the material of the friction disc 120 is preferably carbon ceramic, while the loading disc 110 located in the middle does not need to be made of carbon ceramic, but can be made of carbon-carbon material. Carbon ceramic is a type of ceramic-based composite material, which is a new type of composite material with a three-dimensional felt or woven body of carbon fiber as a reinforcing skeleton and silicon carbide ceramic as a continuous matrix.

[0063] In some embodiments, the preparation of the carbon-carbon loading disc comprises the following steps:

[0064] The carbon fiber cloth and the carbon fiber web are colloidally needle-punched to obtain a carbon fiber preform having a first rotor mounting hole 101;

[0065] The carbon fiber preform is subjected to carbon-carbon densification by chemical vapor deposition to obtain a carbon-carbon rough blank;

[0066] The carbon-carbon blank is processed and the first loading hole 102 is formed to obtain a carbon-carbon loading tray.

[0067] In some embodiments, the preparation of the carbon ceramic friction disc comprises the following steps:

[0068] The carbon fiber cloth and the carbon fiber web are colloidally needle-punched to obtain a carbon fiber preform having a second rotor mounting hole 103;

[0069] The carbon fiber preform is subjected to carbon-carbon densification by chemical vapor deposition to obtain a carbon-carbon rough blank;

[0070] The carbon-carbon rough blank is graphitized and melt-siliconized to obtain a carbon ceramic rough blank;

[0071] The carbon-ceramic rough blank is processed and the second loading hole 104 is formed to obtain a carbon-ceramic friction disc.

[0072] The loading tray 110 in the middle does not need to be made of carbon-ceramic material, but can be made of carbon-carbon material. It does not need to be subjected to melt siliconization treatment, thereby reducing the raw materials for melt infiltration and lowering the production and preparation costs.

[0073] In some embodiments, an anti-oxidation coating is formed on the outer surface of the assembled brake disc 10 by spraying or other methods. Further, for example, an anti-oxidation coating is formed on the outer surfaces of the two friction discs 120 located on the outer sides. Furthermore, the side walls of the friction discs 120 and the loading disc 110 may also be provided with an anti-oxidation coating.

[0074] Furthermore, the material of the anti-oxidation coating includes but is not limited to phosphate.

[0075] The thickness of the preform of the integral carbon ceramic brake disc 10 during preparation generally reaches 40mm to 50mm, which leads to a general difference in deposition density in the later deposition densification process, and further affects the subsequent melt siliconization and PIP process, resulting in the problem of composition difference in the brake disc 10, which affects the stability of the friction and wear performance of the brake disc 10. Compared with the integral carbon ceramic brake disc 10, the thickness of the loading disc 110 or the friction disc 120 is greatly reduced, and the thickness of the carbon fiber preform to be prepared is also reduced; therefore, whether in the carbon-carbon densification process or the later introduction of silicon carbide melt siliconization treatment, the matrix uniformity and process controllability of the split loading disc 110 or friction disc 120 are greatly improved, thereby improving the stability of the friction and wear performance of the brake disc 10, which is conducive to large-scale production.

[0076] In some embodiments, the friction disk 120 has a thickness of 6 mm to 10 mm.

[0077] Furthermore, the total thickness of the loading tray 110 is 12 mm to 20 mm, and the height of the protrusion 112 is 3 mm to 6 mm.

[0078] In some embodiments, the density of the loading tray 110 is 1.1 g / cm 3 ~1.35g / cm 3 Furthermore, the density of the friction disc 120 is 2.0 g / cm 3 ~2.3g / cm 3 , the friction coefficient is between 3.5 and 4.2.

[0079] Furthermore, when preparing the carbon ceramic friction disc and / or the carbon-carbon loading disc, the density of the carbon fiber preform is controlled to be 0.4 g / cm 3 ~0.45g / cm 3 .

[0080] Furthermore, when preparing the carbon ceramic friction disc, the density of the carbon-carbon rough blank obtained after the carbon-carbon densification step is controlled to be 1.35 g / cm 3 ~1.5g / cm 3 .

[0081] Furthermore, when preparing the carbon-carbon loading disc, the density of the carbon-carbon rough blank obtained after the carbon-carbon densification step is controlled to be 1.1 g / cm3 ~1.35g / cm 3 .

[0082] Furthermore, when preparing the carbon-ceramic friction disk and / or the carbon-carbon loading disk, the difference between the carbon-carbon densification is that the carbon-ceramic friction disk is placed in a deposition tooling when preparing the carbon-ceramic friction disk. The chemical vapor deposition conditions of both are: deposition temperature of 1000°C to 1150°C, deposition pressure of 1.5KPa to 3KPa, deposition time of 100h to 150h, and the raw material used for deposition is natural gas, and the gas flow rate is 3m 3 / h~5m 3 / h. Such identical or similar chemical vapor deposition processes can ensure that the density of the deposited carbon-carbon rough blanks is close, ensuring the stability of the performance of the entire carbon ceramic disc in the later stage, and eliminating the need for multiple deposition processes, greatly reducing production costs.

[0083] Furthermore, in the preparation of the carbon ceramic friction disc, the temperature of the graphitization treatment is 2200-2400° C., and the time of the graphitization treatment is 2 h to 4 h.

[0084] Furthermore, the conditions of the melt siliconization treatment in the preparation of the carbon ceramic friction disk are: the siliconization temperature is 1600° C. to 1800° C., the melt infiltration pressure is 100 Pa to 1000 Pa, and the melt infiltration time is 4 h to 6 h.

[0085] In some embodiments, the protrusion 112 extends from the edge of the first rotor mounting hole 101 to the outer edge of the loading disk 110 along the radial direction of the loading disk 110. In this way, when the loading disk 110 and the friction disk 120 are attached, the protrusion 112 can play a better supporting role.

[0086] Further, the loading plate 110 is provided with a ventilation hole 105 in the area between two adjacent protrusions 112. It is understood that the ventilation hole 105 is also formed in the process of processing the carbon-carbon rough blank when preparing the carbon-ceramic friction plate. This can improve the heat dissipation effect. It is understood that there are multiple ventilation holes 105. Specifically, the ventilation hole 105 is a through hole that penetrates the loading plate 110.

[0087] In some embodiments, when the loading plate 110 is connected to each friction plate 120, at least a region of the loading plate 110 is exposed to the second rotor mounting hole 103. This can further improve the heat dissipation effect.

[0088] Furthermore, a ventilation hole 105 is provided on the area of ​​the loading plate 110 exposed to the second rotor mounting hole 103 .

[0089] In some embodiments, the first rotor mounting hole 101 is a circular hole; the second rotor mounting hole 103 has multiple minimum inner diameters, and the multiple minimum inner diameters are the same as the inner diameter of the first rotor mounting hole 101. A semicircular hole is formed outward between two adjacent minimum inner diameters, and the area where the semicircular hole is located corresponds to the area of ​​the loading plate 110 exposed to the second rotor mounting hole 103.

[0090] It is understandable that the connecting piece can be a bolt, which can facilitate the replacement of the friction disc at a later stage while ensuring the stability of the connection.

[0091] In some embodiments, the transportation equipment is a car, a train or an airplane, wherein the train includes a train, a high-speed train and a motor vehicle.

[0092] In order to make the purpose, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the following specific embodiments, but the present invention is by no means limited to these embodiments. The embodiments described below are only preferred embodiments of the present invention, which can be used to describe the present invention and cannot be understood as limiting the scope of the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0093] In order to better illustrate the present invention, the present invention is further described below in conjunction with the embodiments. The following are specific embodiments.

[0094] Example 1

[0095] Preparation Figure 1 The specific steps for the brake disc shown are as follows:

[0096] Step 1: Alternately stack T700 carbon fiber interwoven cloth and carbon fiber mesh tire and needle punch to prepare three circular carbon fiber preforms with a density of 0.45 g / cm 3 Two of them are 12mm thick and the other is 22mm thick. It can be understood that the annular holes are used as subsequent rotor mounting holes.

[0097] Step 2: Place the 12mm thick annular carbon fiber preform obtained in step 1 into a deposition tool, and then place it into a chemical vapor deposition furnace for carbon-carbon densification; the conditions for controlling chemical vapor deposition are as follows: the temperature is 1000°C, natural gas is the carbon source gas, and the natural gas flow rate is 3m 3 / h, furnace pressure of 1500Pa, heat preservation and deposition for 100h, the density is 1.35g / cm 3 Carbon-carbon rough blank.

[0098] Another circular carbon fiber preform with a thickness of 22 mm obtained in step 1 can be used for chemical vapor deposition in the same furnace (in other words, the deposition parameters are the same, and the difference from the deposition conditions in the above step is that it is not placed in a deposition tooling), and a density of 1.15 g / cm is obtained after deposition. 3 Carbon-carbon rough blank.

[0099] Step 3: Set the density to 1.15 g / cm 3 The carbon-carbon rough blank is processed to the required size according to the finished product size, and the corresponding protrusions, the first loading hole and the ventilation hole are processed to obtain the carbon-carbon loading plate.

[0100] Step 4: Set the density to 1.35 g / cm 3 The surface of the carbon-carbon rough blank is roughly processed to open the closed pores on the surface, and then placed in a high-temperature graphitization furnace for graphitization treatment. The graphitization temperature is 2200°C and the treatment time is 4 hours, which is convenient for the next step of infiltration.

[0101] Step 5: Place the graphitized carbon-carbon rough blank in a melt infiltration tool and place it in a high-temperature furnace for melt siliconization. The melt siliconization treatment conditions are as follows: melt infiltration temperature is 1700°C, melt infiltration pressure is 500 Pa, and melt infiltration time is 4 hours. After melt infiltration, a carbon / silicon carbide composite rough blank (i.e., carbon ceramic rough blank) is obtained with a density of 2.0 g / cm 3 .

[0102] Step 6: Grind the surface of the carbon ceramic blank obtained in step 4 until it is smooth and flat, process it to the required size according to the finished product size, process the second loading hole, and fine-process the annular hole to form a second rotor mounting hole to obtain a carbon ceramic friction disc.

[0103] Step 7: Assemble two carbon-ceramic friction discs on the two surfaces of the carbon-carbon loading disc using connectors to obtain a combined brake disc. The friction coefficient of the obtained brake disc is 3.5.

[0104] Step 8: Apply a layer of phosphate on the outer surface of the prepared combined brake disc to form an anti-oxidation coating.

[0105] The thickness of the carbon ceramic friction disc is 10 mm, the thickness of the carbon-carbon loading disc without the raised portion is 8 mm, the thickness of the raised portion is 6 mm, and the total thickness of the carbon-carbon loading disc is 20 mm. The total thickness of the assembled brake disc is 40 mm.

[0106] The method of Example 1 was used for batch production. The results showed that the density difference of the disks in the same batch was 0.1 g / cm 3The difference in friction coefficient is within 0.2, and its stability is much higher than that of the production of integral carbon-ceramic brake discs, which greatly improves the product yield. At the same time, the combined brake disc is conducive to later replacement and reduces solid waste generation.

[0107] Comparative Example 1

[0108] The structure and detailed process of the integral carbon ceramic brake disc are as follows:

[0109] Step 1: Alternately stack T700 carbon fiber interwoven cloth and carbon fiber mesh tire and needle punch to prepare a circular carbon fiber preform with a density of 0.45g / cm 3 The thickness of the ring is 50mm.

[0110] Step 2: Place the 50 mm thick annular carbon fiber preform obtained in step 1 into a chemical vapor deposition furnace for carbon / carbon densification; the chemical vapor deposition conditions are as follows: the temperature is 1000°C, natural gas is the carbon source gas, and the natural gas flow rate is 3m 3 / h, furnace pressure of 1500Pa, heat preservation and deposition for 100h, the density is 1.0g / cm 3 Carbon-carbon rough blank.

[0111] Step 3: Set the density to 1.0 g / cm 3 The carbon-carbon rough blank was end-machined to 46 mm, the carbon-carbon surface deposition closed pores were opened, and it was placed in a carbon-carbon vapor deposition furnace for densification. The same deposition conditions were used to obtain a density of 1.3 g / cm 3 Carbon / carbon blanks.

[0112] Step 4: Set the density to 1.3 g / cm 3 The surface of the carbon / carbon blank was processed further to a thickness of 42 mm and then deposited under the same conditions for 80 h. The density after deposition was 1.38 g / cm 3 The carbon / carbon blank is finely processed according to the finished product drawing to obtain a carbon / carbon brake disc.

[0113] Step 5: After graphitization treatment at 2200°C for 4 hours, the carbon-carbon brake disc is placed in a melt infiltration tool for melt siliconization treatment. The melt siliconization treatment conditions are as follows: melt infiltration temperature is 1800°C, melt infiltration pressure is 500 Pa, and melt infiltration time is 4 hours. After melt infiltration, a carbon / silicon carbide composite rough blank (i.e., carbon ceramic rough blank) is obtained with a density of 1.98 g / cm 3 , the friction coefficient is 3.2.

[0114] Step 8: Apply a layer of phosphate to the outer surface of the prepared brake disc to form an anti-oxidation coating. The thickness of the obtained integral carbon / ceramic brake disc is 40 mm.

[0115] It can be seen from Example 1 and Comparative Example 1 that the method of Example 1 reduces two processes, reduces the processing difficulty, reduces the number of furnace inputs, improves production efficiency, and reduces costs by 50%. At the same time, compared with the integral carbon / ceramic disc, the composition of the split carbon / ceramic disc is uniform and controllable.

[0116] Example 2

[0117] It is basically the same as Example 1, except that:

[0118] The conditions for chemical vapor deposition are as follows: deposition temperature is 1150°C, deposition pressure is 2KPa, deposition time is 120h, the raw material used for deposition is natural gas, and the gas flow rate is 4m 3 / h; the density is 1.4g / cm 3 Carbon-carbon rough blank;

[0119] The conditions of graphitization treatment are as follows: graphitization temperature is 2400°C, and graphitization treatment time is 2h;

[0120] The conditions of melt siliconization treatment are as follows: melt infiltration temperature is 1800℃, melt infiltration pressure is 100Pa, melt infiltration time is 6h, and the carbon / silicon carbide composite rough blank (i.e. carbon ceramic rough blank) is obtained after melt infiltration, with a density of 2.2g / cm 3 .

[0121] Example 3

[0122] It is basically the same as Example 1, except that:

[0123] The conditions for chemical vapor deposition are as follows: deposition temperature is 1100°C, deposition pressure is 3KPa, deposition time is 150h, the raw material used for deposition is natural gas, and the gas flow rate is 4m 3 / h; the density is 1.5g / cm 3 The conditions of melt siliconization treatment are as follows: the melt infiltration temperature is 1600℃, the melt infiltration pressure is 1000pa, and the melt infiltration time is 5h. After melt infiltration, a carbon / silicon carbide composite material rough blank (i.e., carbon ceramic rough blank) is obtained with a density of 2.0g / cm 3 .

[0124] The brake discs prepared in Examples 1 to 3 and Comparative Example 1 were subjected to shear strength tests. Sampling and strength tests were performed according to standard QJ20273. The force-displacement curves obtained were as follows: Figure 5 The shear strength obtained is shown in Table 1 below.

[0125] Table 1

[0126] Group Span / mm Sample width / mm Sample thickness / mm Shear strength / MPa Example 1 24 11.8 6.78 15.38 Example 2 24 10 6.08 17.93 Example 3 24 9.8 4.9 19.63 Comparative Example 1 24 10 5.86 15.38

[0127] It can be seen from Table 1 above that the shear strength of the brake discs prepared in Examples 1 to 3 is comparable to the shear strength of the integral carbon-ceramic brake disc in Comparative Example 1, and the preparation process of the embodiments of the present invention is simple and the cost is reduced.

[0128] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims, and the description and drawings can be used to interpret the content of the claims.

Claims

1. A brake disc, characterized in that: include: A loading plate, the loading plate having a first rotor mounting hole, a surface of the loading plate being provided with a plurality of protrusions in sequence around the first rotor mounting hole, and another surface of the loading plate being provided with the protrusions at positions corresponding to the protrusions, each of the protrusions being provided with a first loading hole; at least two friction discs, each of which has a second rotor mounting hole for communicating with the first rotor mounting hole, each of which is provided with a second loading hole for corresponding to the first loading hole, and each of which has at least one friction disc on both surfaces; and A plurality of connecting members, each of which is used to cooperate with the first loading holes and the second loading holes that are arranged in a one-to-one correspondence, so as to connect the loading disk and each of the friction disks; The loading disc is a carbon-carbon loading disc; the friction disc is a carbon-ceramic friction disc; The first rotor mounting hole is a circular hole; the second rotor mounting hole has a plurality of minimum inner diameters, and the plurality of the minimum inner diameters are the same as the inner diameter of the first rotor mounting hole; a semicircular hole is formed outwardly between two adjacent minimum inner diameters, and the area where the semicircular hole is located corresponds to the area of ​​the loading plate exposed to the second rotor mounting hole; the second loading hole is provided at the plurality of minimum inner diameters; The protrusion extends from the edge of the first rotor mounting hole to the outer edge of the loading plate along the radial direction of the loading plate, and the loading plate is provided with ventilation holes in the area between two adjacent protrusions. When the loading plate is connected to each of the friction plates, at least a part of the loading plate is exposed to the second rotor mounting hole; the ventilation holes are provided in the area of ​​the loading plate exposed to the second rotor mounting hole.

2. The brake disc according to claim 1, characterized in that The density of the loading plate is 1.1 g / cm 3 ~1.35g / cm 3 ; The density of the friction disc is 2.0 g / cm 3 ~2.3g / cm 3 , the friction coefficient is between 3.5 and 4.

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3. The brake disc according to claim 1, characterized in that The total thickness of the loading plate is 12 mm to 20 mm, and the height of the protrusion is 3 mm to 6 mm.

4. The brake disc according to claim 1, characterized in that The thickness of the friction disc is 6 mm to 10 mm.

5. A method for preparing a brake disc, characterized in that: The brake disc is a brake disc as claimed in any one of claims 1 to 4, comprising the following steps: preparing the loading disc and at least two friction discs; At least one friction disk is respectively arranged on the two surfaces of the loading disk; Each of the connecting members is matched with the first loading hole and the second loading hole which are arranged in a one-to-one correspondence, so as to connect the loading disk and each of the friction disks.

6. The method for preparing a brake disc according to claim 5, characterized in that: The preparation of the loading tray comprises the following steps: Needle-punching the carbon fiber cloth and the carbon fiber web colloid to obtain a carbon fiber preform having the first rotor mounting hole; The carbon fiber preform is subjected to carbon-carbon densification by chemical vapor deposition to obtain a carbon-carbon rough blank; Processing the carbon-carbon rough blank and forming the first loading hole to obtain the loading tray; And / or, the preparation of the friction disc comprises the following steps: Needle-punching the carbon fiber cloth and the carbon fiber web colloid to obtain a carbon fiber preform having the second rotor mounting hole; The carbon fiber preform is subjected to carbon-carbon densification by chemical vapor deposition to obtain a carbon-carbon rough blank; The carbon-carbon rough blank is graphitized and melt-siliconized to obtain a carbon ceramic rough blank; The carbon ceramic blank is processed and the second loading hole is formed to obtain the friction disc.

7. The method for preparing a brake disc according to claim 6, characterized in that: When preparing the carbon-carbon loading disc, the density of the carbon-carbon rough blank obtained after the carbon-carbon densification step is controlled to be 1.1 g / cm 3 ~1.35g / cm 3 .

8. The method for preparing a brake disc according to claim 6, characterized in that: When preparing the carbon ceramic friction disc and / or the carbon carbon loading disc, the density of the carbon fiber preform is controlled to be 0.4 g / cm 3 ~0.45g / cm 3 .

9. The method for preparing a brake disc according to claim 6, characterized in that: When preparing the friction disc, the density of the carbon-carbon rough blank is controlled to be 1.35 g / cm 3 ~1.5g / cm 3 .

10. A traffic device, characterized in that: It comprises a wheel hub, a rotor and a brake disc as claimed in any one of claims 1 to 4, wherein the rotor is installed in the first rotor mounting hole and the second rotor mounting hole and connected to the loading disc, and the wheel hub is connected to the rotor.

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