Carbon ceramic brake disc with ventilation channels and method for manufacturing the same

Abstract

The application provides a carbon ceramic brake disc with ventilation channels, which comprises an upper base body and a lower base body, a plurality of heat dissipation channels are arranged at the joint of the upper base body and the lower base body, the heat dissipation channels are uniformly distributed in a circle, a plurality of ventilation channels are arranged on the upper base body and the lower base body, the ventilation channels penetrate through the upper base body or the lower base body and are communicated with the heat dissipation channels. By arranging the heat dissipation channels and the ventilation channels on the carbon ceramic brake disc, limiting the size relationship between the inner surface of the ventilation channel and the side wall surface area of the heat dissipation channel, and the volume relationship between the sum of the areas of the two and the carbon ceramic brake disc, the rationality of the arrangement of the heat dissipation channels and the ventilation channels is improved, and the heat dissipation effect of the carbon ceramic brake disc caused by the cooperation of the two is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake disc manufacturing, in particular to a carbon ceramic brake disc containing ventilation channels and a preparation method thereof. BACKGROUND

[0002] The brake disc is an important part installed on vehicles such as cars and motorcycles, and is used for braking the vehicle. It is usually located between the wheels and works in cooperation with the brake caliper, brake pad and the like in the brake system. The brake disc mainly plays a role in reducing speed or stopping suddenly during the operation of the car, and is particularly important in the case of an emergency situation, which relates to the safety of human life. At present, carbon ceramic brake discs are prepared by using carbon fiber reinforced silicon carbide material, but carbon fiber is not resistant to high temperature oxidation in air, and the friction coefficient is prone to fluctuate at high temperature. At present, ventilation channels are usually arranged in the center of the brake disc to increase the heat exchange capacity of the brake disc and thus reduce the temperature. The brake heat generated during braking is mainly dissipated through the ventilation structure of the brake disc, but part of the brake heat causes the surface temperature of the brake disc to rise sharply, greatly reducing the wear resistance of the brake disc and the braking performance of the vehicle, and inducing safety hazards in the braking of the vehicle. If the ventilation channels are not reasonably designed, the heat exchange capacity will be poor and the surface temperature of the brake disc will be high.

[0003] To this end, a carbon ceramic brake disc containing ventilation channels is provided, which limits the relationship between the side surface area of the ventilation channels and the heat dissipation channels, and the relationship between the sum of the areas and the volume of the brake disc, so that the brake disc has good heat dissipation effect. SUMMARY

[0004] The present application aims to provide a carbon ceramic brake disc containing ventilation channels, which opens ventilation channels and heat dissipation channels to improve the heat dissipation capacity of the brake disc, and at the same time proposes a relationship between the areas of the ventilation channels and the heat dissipation channels to optimize the proportion and further improve the heat dissipation effect of the brake disc.

[0005] To achieve this purpose, the present application provides a carbon ceramic brake disc containing ventilation channels, which comprises an upper base body and a lower base body, and the upper base body and the lower base body are fixed as a whole. A plurality of heat dissipation channels are arranged at the connection between the upper base body and the lower base body, and the heat dissipation channels are uniformly distributed in a circle. A plurality of ventilation channels are arranged on the upper base body and the lower base body, and the ventilation channels penetrate through the upper base body or the lower base body and communicate with the heat dissipation channels. The total area of the inner surface of the ventilation channels is S t , the total area of the side wall of the heat dissipation channels is S S , and the total volume of the carbon ceramic brake disc containing ventilation channels is V, which satisfies the following formula:

[0006] 3S t <S s

[0007] a*V < (S s + S t )

[0008] wherein a is a coefficient, the size of which is 10 / mm.

[0009] Preferably, the vent channels are connected to the surface vent holes of the carbon-ceramic brake disc surface, and each surface vent hole has an area of 5-50 mm 2 .

[0010] Preferably, the vent channels are connected to the internal vent holes of the carbon-ceramic brake disc surface, and each internal vent hole has an area of 3-40 mm 2 .

[0011] Preferably, the area of the surface vent hole is greater than the area of the internal vent hole.

[0012] Preferably, the vent channels extend from the carbon-ceramic brake disc surface to the heat dissipation holes at a predetermined angle with respect to the carbon-ceramic brake disc surface.

[0013] Preferably, the angle is 45-90°.

[0014] The present application also provides a method for preparing a carbon-ceramic brake disc with vent channels, which is used to prepare the carbon-ceramic brake disc with vent channels as described above, and the method comprises the following steps:

[0015] S1: preparing a carbon fiber preform with a predetermined thickness;

[0016] S2: placing the carbon fiber preform into a CVI furnace for vapor deposition, wherein the deposition temperature is 900-1100℃, the time is 150-300h, the methane flow rate is 80-180L / h, and the nitrogen flow rate is 3-20L / h, to obtain a CVI blank;

[0017] S3: mechanically processing the CVI blank to obtain a brake disc blank, wherein the brake disc blank comprises an upper base body and a lower base body, and a predetermined number of vent channels and heat dissipation holes are distributed on the surface and the side surface of the brake disc blank;

[0018] S4: placing the brake disc blank into a boron nitride crucible, and then placing the boron nitride crucible together with the brake disc blank into a vacuum furnace for silicon infiltration treatment to obtain a silicon-infiltrated blank;

[0019] S5: performing surface polishing and outer contour size processing on the silicon-infiltrated blank to obtain a carbon-ceramic brake disc with vent channels.

[0020] Preferably, the carbon fiber preform preparation method is as follows: stacking carbon fiber unidirectional cloth and carbon fiber mesh as a unit layer, wherein the carbon fiber directions of the carbon fiber unidirectional cloth of two adjacent unit layers are at a 90° angle, and after stacking one unit, the sample is needle-punched, and the unit layers are repeatedly stacked to obtain a carbon fiber preform of the desired thickness, wherein the needle-punching density is 50-200 needles / cm 2 .

[0021] Preferably, pure silicon powder having a mass 1.1 times that of the brake disc blank is pre-added into the boron nitride crucible.

[0022] Preferably, the siliconizing treatment temperature is 1600-1700° C., the holding time is 2-4 hours, and the furnace pressure is less than 1000 Pa.

[0023] Beneficial Effects: The carbon-ceramic brake disc with ventilation ducts provided by the present invention improves the rationality of the arrangement of the heat dissipation and ventilation ducts by providing heat dissipation ducts and ventilation ducts within the carbon-ceramic brake disc, and by defining the relationship between the area of ​​the inner surface of the ventilation ducts and the area of ​​the heat dissipation duct sidewalls, as well as the relationship between the sum of the areas of the two and the volume of the carbon-ceramic brake disc. This further enhances the heat dissipation effect of the carbon-ceramic brake disc brought about by the combination of the two ducts. Furthermore, the ventilation ducts are arranged with different sizes at both ends, with the area of ​​the surface ventilation duct openings being larger than the area of ​​the inner ventilation duct openings. This increases the flow of external air into the ventilation ducts, improves the gas flow rate and flow rate within the heat dissipation ducts, and further enhances the heat dissipation capacity of the carbon-ceramic brake disc. Furthermore, the present invention provides a method for preparing the carbon-ceramic brake disc with ventilation ducts. The method first involves overlapping and needling a carbon fiber mesh and a carbon fiber unidirectional cloth, followed by vapor deposition, to produce a CVI blank. The pre-arranged heat dissipation and ventilation ducts are then machined to form the disc. The disc is then siliconized and polished to obtain the product. The entire preparation process is simple, and the operation is simple and easy to produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a carbon-ceramic brake disc with ventilation holes according to the present invention.

[0025] Figure 2 This is a bottom view of the carbon-ceramic brake disc with ventilation channels according to the present invention.

[0026] In the figure: 1-upper base, 2-lower base, 3-ventilation channel, 4-heat dissipation channel. DETAILED DESCRIPTION

[0027] The embodiments described below are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] Reference Figure 1 and Figure 2 The present application provides a carbon ceramic brake disc with ventilation channels, which comprises an upper base body 1 and a lower base body 2, and the upper base body 1 and the lower base body 2 are fixed as a whole. A plurality of heat dissipation channels 4 are arranged at the joint of the upper base body 1 and the lower base body 2, and the heat dissipation channels 4 are uniformly distributed in a circle. A plurality of ventilation channels 3 are arranged on the upper base body 1 and the lower base body 2, and the ventilation channels 3 penetrate the upper base body 1 or the lower base body 2 and communicate with the heat dissipation channels 4. The total area of the inner surface of the ventilation channels 3 is S t , the total area of the side wall of the heat dissipation channels 4 is S S , and the total volume of the carbon ceramic brake disc with ventilation channels is V, which satisfies the following formula:

[0029] 3S t <S s

[0030] a*V<(S s +S t )

[0031] Wherein a is a coefficient, and the size is 10 / mm.

[0032] The orifice connected with the ventilation channels 3 and the disc surface of the carbon ceramic brake disc with ventilation channels is a surface ventilation orifice, and the area of each surface ventilation orifice is 5-50mm 2 .

[0033] The orifice connected with the ventilation channels 3 and the heat dissipation channels 4 is an internal ventilation orifice, and the area of each internal ventilation orifice is 3-40mm 2 .

[0034] The area of the surface ventilation orifice is greater than the area of the internal ventilation orifice.

[0035] The ventilation channels extend from the disc surface of the carbon ceramic brake disc with ventilation channels to the heat dissipation channels in a predetermined angle.

[0036] The angle is 45-90°.

[0037] The present application also provides a preparation method of the carbon ceramic brake disc with ventilation channels, and the preparation method is as follows:

[0038] S1: preparing a carbon fiber preform with a predetermined thickness;

[0039] S2: Put the carbon fiber preform into the CVI furnace for gas phase deposition, the deposition temperature is 900-1100℃, the time is 150-300h, the methane flow is 80-180L / h, and the nitrogen flow is 3-20L / h, to obtain a CVI blank;

[0040] S3: Mechanically process the CVI blank to obtain a brake disc blank, the brake disc blank includes an upper base body and a lower base body, and a predetermined number of ventilation channels and heat dissipation channels are distributed on the surface and side surface of the brake disc blank;

[0041] S4: Put the brake disc blank into a boron nitride crucible, and then put the boron nitride crucible together with the brake disc blank into a vacuum furnace for silicon infiltration treatment to obtain a silicon infiltration blank;

[0042] S5: Surface grinding and outer contour size processing are performed on the silicon infiltration blank to obtain a carbon ceramic brake disc containing ventilation channels.

[0043] The preparation method of the carbon fiber preform comprises: stacking carbon fiber unidirectional cloth and carbon fiber net tire as a unit layer, wherein the carbon fiber directions of the carbon fiber unidirectional cloth of two adjacent unit layers form a 90° angle, needling the sample after stacking one unit, and repeatedly stacking unit layers to obtain a carbon fiber preform with a desired thickness, and the needling density is 50-200 needles / cm 2 .

[0044] The boron nitride crucible is pre-filled with pure silicon powder with a mass of 1.1 times that of the brake disc blank.

[0045] The silicon infiltration treatment temperature is 1600-1700℃, the holding time is 2-4h, and the furnace pressure is less than 1000Pa.

[0046] Example 1

[0047] The present embodiment provides a carbon ceramic brake disc containing ventilation channels, and the preparation steps are as follows:

[0048] S1: Stack carbon fiber unidirectional cloth and carbon fiber net tire as a unit layer, wherein the carbon fiber directions of the carbon fiber unidirectional cloth of two adjacent unit layers form a 90° angle, needling the sample after stacking one unit, and repeatedly stacking unit layers to obtain a carbon fiber preform with a desired thickness, and the needling density is 150 needles / cm 2 ;

[0049] S2: Put the carbon fiber preform into the CVI furnace for gas phase deposition, the deposition temperature is 1000℃, the time is 200h, the methane flow is 100L / h, and the nitrogen flow is 8L / h, to obtain a CVI blank;

[0050] S3: machining the CVI blank to obtain a brake disc blank, the brake disc blank comprising an upper base body and a lower base body, a predetermined number of ventilation channels and heat dissipation channels being machined on the surface and side surface of the brake disc blank, the surface ventilation hole area of a single hole of the ventilation channel being 12.5mm 2 , the internal ventilation hole area being 9mm 2 ; the sum of the side surface areas of the heat dissipation channels after machining is 4 times the sum of the side surface areas of the ventilation channels, the sum of the side surface areas of the heat dissipation channels and the ventilation channels is 14 times the volume of the brake disc blank, and the included angle between the ventilation channels and the plane of the brake disc blank is 90°;

[0051] S4: placing the brake disc blank into a boron nitride crucible and placing the boron nitride crucible together with the brake disc blank into a vacuum furnace for siliconizing treatment to obtain a siliconized blank, 1.1 times the mass of the brake disc blank of pure silicon powder being pre-added into the boron nitride crucible, the siliconizing treatment temperature being 1650℃, the holding time being 2h, and the furnace pressure being less than 1000Pa;

[0052] S5: surface grinding and outer contour size machining of the siliconized blank to obtain a carbon ceramic brake disc containing ventilation channels.

[0053] Example 2

[0054] The present embodiment provides a carbon ceramic brake disc containing ventilation channels, and the preparation steps are as follows:

[0055] S1: stacking carbon fiber unidirectional cloth and carbon fiber net tire as a unit layer, wherein the carbon fiber directions of the carbon fiber unidirectional cloth of two adjacent unit layers form an included angle of 90°, needling the sample after stacking one unit, and repeatedly stacking unit layers to obtain a carbon fiber preform with a desired thickness, the needling density being 150 needles / cm 2 ;

[0056] S2: placing the carbon fiber preform into a CVI furnace for vapor deposition, the deposition temperature being 1000℃, the time being 200h, to obtain a CVI blank, the methane flow being 100L / h, and the nitrogen flow being 8L / h;

[0057] S3: machining the CVI blank to obtain a brake disc blank, the brake disc blank comprising an upper base body and a lower base body, a predetermined number of ventilation channels and heat dissipation channels being machined on the surface and side surface of the brake disc blank, the surface ventilation hole area of a single hole of the ventilation channel being 20mm 2 , the internal ventilation hole area being 15mm 2; the sum of the side surface areas of the heat dissipation holes is 4 times the sum of the side surface areas of the ventilation holes, the sum of the side surface areas of the heat dissipation holes and the ventilation holes is 14 times the volume of the brake disc blank, and the ventilation holes are at an angle of 90° with the plane of the brake disc blank;

[0058] S4: placing the brake disc blank into a boron nitride crucible and placing the boron nitride crucible together with the brake disc blank into a vacuum furnace for siliconizing treatment to obtain a siliconized blank, pure silicon powder with a mass 1.1 times that of the brake disc blank is added in advance into the boron nitride crucible, the siliconizing treatment temperature is 1650°C, the holding time is 2h, and the furnace pressure is less than 1000Pa;

[0059] S5: performing surface grinding and outer contour size processing on the siliconized blank to obtain a carbon ceramic brake disc containing ventilation holes.

[0060] Example 3

[0061] S1: stacking carbon fiber unidirectional cloth and carbon fiber web as a unit layer, wherein the carbon fiber directions of the carbon fiber unidirectional cloth of two adjacent unit layers are at an angle of 90°, and after stacking one unit, the sample is needled, and the unit layer is repeatedly stacked to obtain a carbon fiber preform with a desired thickness, and the needle density is 150 needles / cm 2 ;

[0062] S2: placing the carbon fiber preform into a CVI furnace for vapor deposition, the deposition temperature is 1000°C, the time is 200h, and a CVI blank is obtained, the methane flow is 100L / h, and the nitrogen flow is 8L / h;

[0063] S3: mechanically processing the CVI blank to obtain a brake disc blank, the brake disc blank includes an upper base body and a lower base body, and a predetermined number of ventilation holes and heat dissipation holes are distributed on the surface and side surface of the brake disc blank, the surface ventilation hole area of a single hole of the ventilation hole is 12.5mm 2 , the internal ventilation hole area is 9mm 2 , the sum of the side surface areas of the heat dissipation holes after processing is 4 times the sum of the side surface areas of the ventilation holes, the sum of the side surface areas of the heat dissipation holes and the ventilation holes is 14 times the volume of the brake disc blank, and the ventilation holes are at an angle of 85° with the plane of the brake disc blank;

[0064] S4: placing the brake disc blank into a boron nitride crucible and placing the boron nitride crucible together with the brake disc blank into a vacuum furnace for siliconizing treatment to obtain a siliconized blank, pure silicon powder with a mass 1.1 times that of the brake disc blank is added in advance into the boron nitride crucible, the siliconizing treatment temperature is 1650°C, the holding time is 2h, and the furnace pressure is less than 1000Pa;

[0065] S5: surface grinding and outer contour size processing of the siliconized blank to obtain a carbon ceramic brake disc containing ventilation channels.

[0066] Example 4

[0067] S1: carbon fiber unidirectional cloth and carbon fiber web are stacked as a unit layer, wherein the carbon fiber direction of the carbon fiber unidirectional cloth of the adjacent two unit layers forms a 90° angle, the sample is needled after stacking one unit, and the unit layer is repeatedly stacked to obtain a carbon fiber preform with a desired thickness, and the needling density is 150 needles / cm 2 ;

[0068] S2: placing the carbon fiber preform into a CVI furnace for vapor deposition, the deposition temperature is 1000°C, the time is 200h, the methane flow is 100L / h, and the nitrogen flow is 8L / h;

[0069] S3: mechanical processing of the CVI blank to obtain a brake disc blank, the brake disc blank includes an upper substrate and a lower substrate, a predetermined number of ventilation channels and heat dissipation channels are distributed on the surface and side surface of the brake disc blank, the surface ventilation orifice area of a single orifice of the ventilation channel is 12.5mm 2 , the internal ventilation orifice area is 9mm 2 ; the sum of the side surface areas of the heat dissipation channels after processing is 4 times the sum of the side surface areas of the ventilation channels, the sum of the side surface areas of the heat dissipation channels and the ventilation channels is 14 times the volume of the brake disc blank, and the included angle between the ventilation channels and the plane of the brake disc blank is 45°;

[0070] S4: placing the brake disc blank into a boron nitride crucible, and placing the boron nitride crucible together with the brake disc blank into a vacuum furnace for siliconizing treatment to obtain a siliconized blank, pure silicon powder with a mass 1.1 times that of the brake disc blank is pre-added into the boron nitride crucible, the siliconizing treatment temperature is 1650°C, the holding time is 2h, and the furnace pressure is less than 1000Pa;

[0071] S5: surface grinding and outer contour size processing of the siliconized blank to obtain a carbon ceramic brake disc containing ventilation channels.

[0072] Comparative Example 1

[0073] This comparative example provides a carbon ceramic brake disc containing ventilation channels, and the preparation steps are as follows:

[0074] S1: carbon fiber unidirectional cloth and carbon fiber web are stacked as a unit layer, wherein the carbon fiber direction of the carbon fiber unidirectional cloth of the adjacent two unit layers forms a 90° angle, the sample is needled after stacking one unit, and the unit layer is repeatedly stacked to obtain a carbon fiber preform with a desired thickness, and the needling density is 150 needles / cm2 ;

[0075] S2: placing the carbon fiber preform into a CVI furnace for vapor deposition at a temperature of 1000° C. for 200 h to obtain a CVI blank, with a methane flow rate of 100 L / h and a nitrogen flow rate of 8 L / h;

[0076] S3: Mechanically process the CVI blank to obtain a brake disc blank, which includes an upper base and a lower base. A predetermined number of ventilation channels and heat dissipation channels are distributed and processed on the surface and side of the brake disc blank. The surface ventilation hole area of ​​a single hole of the ventilation channel is 12.5mm 2 , the internal ventilation opening area is 12.5mm 2 The sum of the side areas of the heat dissipation ducts after processing is 4 times the sum of the side areas of the ventilation ducts. The sum of the side areas of the heat dissipation ducts and the ventilation ducts is 8 times the volume of the brake disc blank. The angle between the ventilation ducts and the plane of the brake disc blank is 90°.

[0077] S4: placing the brake disc blank into a boron nitride crucible and placing the boron nitride crucible and the brake disc blank into a vacuum furnace for siliconizing treatment to obtain a siliconized blank. Pure silicon powder 1.1 times the mass of the brake disc blank is pre-added into the boron nitride crucible. The siliconizing treatment temperature is 1650° C., the holding time is 2 hours, and the furnace pressure is less than 1000 Pa.

[0078] S5: performing surface grinding and outer contour dimension processing on the siliconized blank to obtain a carbon-ceramic brake disc containing ventilation ducts.

[0079] Comparative Example 2

[0080] This comparative example provides a carbon-ceramic brake disc containing ventilation channels, and the preparation steps are as follows:

[0081] S1: Carbon fiber unidirectional cloth and carbon fiber mesh are stacked as a unit layer, wherein the carbon fiber directions of the carbon fiber unidirectional cloth of two adjacent unit layers are at a 90° angle. After stacking one unit, the sample is needle-punched. The unit layers are repeatedly stacked to obtain a carbon fiber preform of the desired thickness. The needle-punching density is 150 needles / cm 2 ;

[0082] S2: placing the carbon fiber preform into a CVI furnace for vapor deposition at a temperature of 1000° C. for 200 h to obtain a CVI blank, with a methane flow rate of 100 L / h and a nitrogen flow rate of 8 L / h;

[0083] S3: machining the CVI blank to obtain a brake disc blank, the brake disc blank comprising an upper base body and a lower base body, a predetermined number of ventilation channels and heat dissipation channels are machined on the surface and side surface of the brake disc blank, the surface ventilation hole area of the single hole of the ventilation channel is 12.5mm 2 , the internal ventilation hole area is 12.5mm 2 ; the sum of the side surface areas of the heat dissipation channels after machining is 2 times the sum of the side surface areas of the ventilation channels, the sum of the side surface areas of the heat dissipation channels and the ventilation channels is 8 times the volume of the brake disc blank, and the included angle between the ventilation channels and the plane of the brake disc blank is 90°;

[0084] S4: placing the brake disc blank into a boron nitride crucible and placing the boron nitride crucible together with the brake disc blank into a vacuum furnace for siliconizing treatment to obtain a siliconized blank, pure silicon powder with a mass of 1.1 times the mass of the brake disc blank is pre-added into the boron nitride crucible, the siliconizing treatment temperature is 1650℃, the holding time is 2h, and the furnace pressure is less than 1000Pa;

[0085] S5: surface polishing and outer contour size machining of the siliconized blank to obtain a carbon ceramic brake disc containing ventilation channels.

[0086] The carbon ceramic brake discs containing ventilation channels prepared in Examples 1-4 and Comparative Examples 1-2 above were tested. The test method is as follows:

[0087] Disc surface temperature: tested according to the high load test method in GB / T 34422-2017, the temperature is the highest temperature during the test. The disc surface temperature test position is detected according to the temperature measurement method in A.2.6 of the national standard

[0088] The test data are as follows in Table 1.

[0089] Table 1 Test data of carbon ceramic brake discs containing ventilation channels of Examples 1-4 and Comparative Examples 1-2

[0090]

[0091] From the above test data, it can be seen that the relationship between the side surface areas of the ventilation channels and the heat dissipation channels and the relationship between the sum of the areas and the volume of the brake disc in Example 1 are reasonably designed, and the disc surface temperature is lower, which is 620℃. The area of the two ends of the ventilation channel is increased in Example 2, the air volume is increased, and the disc surface temperature is further reduced. The angle between the ventilation channel and the disc surface in Example 3 is 85°, which is easier to enter air when the brake disc rotates, and the disc surface temperature is lower than that of Example 1.

[0092] The ratio of the sum of the side surface area of the heat dissipation hole and the side surface area of the ventilation hole to the volume of the disc body decreases. For the disc body of the same volume, the reduction of the heat dissipation area leads to the increase of the temperature of the disc surface. When the inner and outer orifice areas of the ventilation hole are the same, the difficulty of air entering increases. Therefore, the temperature of the comparative example 1 reaches 710 DEG C, which indicates that the heat dissipation effect is poor. The comparative example 2 increases the ratio of the side surface area of the ventilation hole on the basis of the comparative example 1. The ratio in the claim 1 is 3. When the ratio is less than the value, the heat taken out of the disc surface by the ventilation hole is greater than the heat dissipated by the heat dissipation hole. The increased side surface area of the ventilation hole has little effect on the temperature reduction. On the contrary, the loss of the volume of the base body reduces the overall strength of the brake disc to a certain extent.

[0093] The above only discloses several preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application. Therefore, the equivalent changes made in the scope of the patent application of the present application still fall within the scope of the present application.

Claims

1. A carbon-carbon brake disc having ventilation channels, the carbon-carbon brake disc having an upper base and a lower base fixed as one, characterized in that, The upper base and the lower base are connected with a plurality of heat dissipation holes, which are uniformly distributed in a circle, and a plurality of ventilation holes are arranged on the upper base and the lower base, which penetrate the upper base or the lower base and communicate with the heat dissipation holes; the total area of the inner surface of the ventilation hole is S t , the total area of the side wall of the heat dissipation hole is S S , and the total volume of the carbon ceramic brake disc containing the ventilation hole satisfies the following formula: Wherein a is a coefficient, the size of which is 10 / mm.

2. The carbon-carbon brake disc with vented channels as recited in claim 1, wherein, The orifices connecting the vent channels with the disc surface of the carbon ceramic brake disc are surface vent orifices, and the area of each surface vent orifice is 5-50 mm 2 .

3. The carbon-carbon brake disc with vented channels as recited in claim 2, wherein, The orifice connecting the ventilation channel and the heat dissipation channel is an internal ventilation orifice, and each internal ventilation orifice has an area of 3-40 mm 2 .

4. The carbon-carbon brake disc with vented channels of claim 3, wherein, The area of the surface vent hole is greater than the area of the internal vent hole.

5. The carbon-carbon brake disc with vented channels of claim 1 wherein, The vent channel extends from the carbon ceramic brake disc containing the vent channel to the heat dissipation channel at a predetermined angle with the carbon ceramic brake disc containing the vent channel.

6. The carbon-carbon brake disc with vented channels of claim 5, wherein, The angle is 45-90°.

7. A method for producing a carbon-carbide brake disc with ventilation channels, for producing a carbon-carbide brake disc with ventilation channels according to any one of claims 1 to 6, characterized in that The preparation method is as follows: S1: preparing a carbon fiber preform with a predetermined thickness; S2: placing the carbon fiber preform into a CVI furnace for gas phase deposition, the deposition temperature being 900-1100℃, the time being 150-300h, the methane flow being 80-180L / h, and the nitrogen flow being 3-20L / h, to obtain a CVI blank; S3: mechanically processing the CVI blank to obtain a brake disc blank, the brake disc blank including an upper base body and a lower base body, a predetermined number of vent channels and heat dissipation channels being distributed on the surface and side surface of the brake disc blank; S4: placing the brake disc blank into a boron nitride crucible, and placing the boron nitride crucible together with the brake disc blank into a vacuum furnace for silicon infiltration treatment to obtain a silicon infiltration blank; S5: surface polishing and outer contour size processing of the silicon infiltration blank to obtain a carbon ceramic brake disc containing a vent channel.

8. The method for preparing a carbon-ceramic brake disc containing ventilation ducts according to claim 7, wherein: The method for preparing the carbon fiber preform is: stacking carbon fiber unidirectional cloth and carbon fiber net tire as a unit layer, wherein the carbon fiber direction of the carbon fiber unidirectional cloth of two adjacent unit layers is at a 90° angle, needling the sample after stacking one unit, and repeatedly stacking unit layers to obtain a carbon fiber preform with a desired thickness, and the needling density is 50-200 needles / cm 2 .

9. The method for preparing a carbon-ceramic brake disc containing ventilation ducts according to claim 7, wherein: The boron nitride crucible is pre-added with pure silicon powder with a mass 1.1 times that of the brake disc blank.

10. The method for preparing a carbon-ceramic brake disc containing ventilation ducts according to claim 7, wherein: The silicon infiltration treatment temperature is 1600-1700℃, the holding time is 2-4h, and the furnace pressure is less than 1000Pa.

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