An inlaid carbon-ceramic brake disc and its preparation method

Abstract

The present application discloses an inlaid carbon-ceramic brake disc, which includes a composite disc body and silicon carbide columns. The composite disc body is a carbon-carbon composite material composed of deposited carbon and carbon fibers obtained by densifying a carbon fiber preform. A number of inlaid holes are provided on the disc surface of the composite disc body; the silicon carbide columns are formed by embedding graphite columns into the inlaid holes, and under vacuum and high-temperature conditions, molten silicon is infiltrated into the composite disc body to react with the graphite columns to generate silicon carbide columns; at the same time, the molten silicon reacts with the deposited carbon to generate silicon carbide, forming a carbon-ceramic material composed of carbon fibers, silicon carbide, remaining silicon, and remaining graphite on the disc surface of the composite disc body.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to an inlaid carbon-ceramic brake disc and a preparation method of an inlaid carbon-ceramic brake disc. Background Art

[0002] Compared with iron-based brake discs, carbon-ceramic brake discs have the advantages of light weight, stable friction coefficient, wear resistance, etc. They are the preferred brake discs for the braking systems of high-end cars, racing cars, new energy vehicles and other models. At present, the preparation methods of carbon-ceramic brake discs are mainly divided into two categories. One is short fiber molding, and the other is long fiber needle punching process. In order to improve the surface friction effect, a special friction layer will be formed on the surface. Although it has a certain friction effect, the cost is relatively high. At present, for other process brake discs, there are two types of friction surfaces. One is without coating treatment on the surface, with generally low silicon carbide content and low friction coefficient. The other is with coating treatment on the surface, and the disc surface is basically silicon carbide, with a high friction coefficient, but the cost is high, and there is also a risk of detachment between the coating and the disc body. Summary of the Invention

[0003] In order to solve at least one of the above technical problems and develop a brake disc with a high friction coefficient, low cost and high stability during use, the present application provides an inlaid carbon-ceramic brake disc and its preparation method.

[0004] On the one hand, an inlaid carbon-ceramic brake disc provided by the present application includes a composite disc body and silicon carbide columns. The composite disc body is a carbon-carbon composite material composed of deposited carbon and carbon fibers obtained by densifying a carbon fiber preform. A plurality of inlaid holes are provided on the disc surface of the composite disc body. The silicon carbide columns are formed by embedding graphite columns into the inlaid holes. Under vacuum and high temperature conditions, molten silicon is infiltrated into the composite disc body and reacts with the graphite columns to generate silicon carbide columns. At the same time, molten silicon reacts with deposited carbon to generate silicon carbide, forming a carbon-ceramic material composed of carbon fibers, silicon carbide, remaining silicon and remaining graphite.

[0005] Optionally, the inlaid holes form several concentric circles with the disc surface of the composite disc body on the disc surface of the composite disc body, and the inlaid holes located within each circle are distributed in an annular array around the center of the circle.

[0006] Optionally, the diameter of the inlaid holes is set to 3-20 mm, and the depth of the inlaid holes is greater than 2 mm.

[0007] Optionally, the hole area of the inlaid holes accounts for 10-50% of the disc surface area of the composite disc body.

[0008] Optionally, the carbon fiber preform is prepared by alternately laying fiber layers and mesh tire layers and through a needle punching process.

[0009] Optionally, the density of the graphite column is set at 1.5-2.0 g / cm3 。

[0010] Optionally, the particle size of the silicon is set to 30 - 300 mesh, and the purity is greater than 99%; the mass ratio of the silicon to the total mass of the composite disk body and the graphite column before silicon infiltration is 1 - 2:1.

[0011] Optionally, the mass ratio of the deposited carbon to the carbon fiber is 2 - 4:1.

[0012] In a second aspect, the present application provides a method for preparing the above-mentioned inlaid carbon-ceramic brake disc, including the following steps:

[0013] S1. Prepare a preform

[0014] Use a fiber layer and a mesh tire layer to alternately lay layers, and use a needling process to prepare a carbon fiber preform;

[0015] S2. Deposition

[0016] The carbon fiber preform is densified by CVI deposition, and deposited carbon is generated on the surface of the preform to form a carbon-carbon composite material composed of deposited carbon and carbon fiber;

[0017] S3. Machining

[0018] Machine-process the carbon fiber preform after being treated in S2, and open inlay holes on the disk surface of the carbon fiber preform to obtain a composite disk body;

[0019] S4. Inlay Embed graphite columns into the inlay holes of the composite disk body in S3, and polish the surface flat;

[0020] S5. Silicon infiltration

[0021] Put the composite disk body in S4 into a crucible, and under the condition of maintaining vacuum and high temperature, utilize the capillary force to infiltrate the melted silicon into the composite disk body. The melted silicon reacts with the deposited carbon to generate silicon carbide, and a carbon-ceramic material composed of carbon fiber, silicon carbide, remaining silicon, and remaining graphite is formed on the disk surface of the composite disk body; the melted silicon reacts with the graphite column to form a silicon carbide column; S6. Final processing

[0022] Machine-process the brake disc after silicon infiltration in S5 to obtain a finished brake disc.

[0023] Optionally, the reaction temperature in S4 is set to 1500 - 1700 °C, the reaction vacuum degree is less than 2000 Pa, and the reaction time is set to 0.5 - 5 h.

[0024] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The composite disk body is turned into a carbon-ceramic material, improving the oxidation resistance of the composite disk body, and raising the oxidation resistance temperature of the composite disk body to about 2000 °C; it has high strength, high hardness, and corrosion resistance;

[0025] 2. Setting silicon carbide columns in the inlaid holes of the composite disc body can effectively increase the content of silicon carbide on the surface of the composite disc body; with the increase in the content of silicon carbide, the overall hardness can be improved, and the influence of high temperature on the braking performance of the brake disc can be reduced, ensuring that the friction coefficient of the brake disc does not drop too quickly at high temperature, thus making the braking performance of the brake disc stable;

[0026] 3. Only increasing the content of silicon carbide on the braking friction surface can, while ensuring the braking performance, significantly reduce the average density of the composite disc body and the total mass of the composite disc body;

[0027] 4. As the braking consumes the surface of the composite disc body and the silicon carbide columns, that is, the consumption of the friction surface, the content of silicon carbide on the friction surface always remains at a relatively stable ratio and will not suddenly drop a lot within a wide range, resulting in a sudden drop in braking performance, thus extending the service life of the brake disc;

[0028] 5. Through the carbon-ceramic material of the composite disc body and the silicon carbide columns, the content of silicon carbide on the friction surface can be adjusted by controlling the ratio of the silicon carbide columns, and then the friction coefficient of the braking friction surface of the brake disc can be adjusted. The ratio of the silicon carbide columns can be changed only by changing the diameter or the number of the silicon carbide columns, without the need to adjust the specific formula and processing technology, reducing the adjustment difficulty and enabling the preparation of brake discs with multiple friction coefficients with the same formula and process. Specific embodiments

[0029] The following further describes the present application in detail with reference to embodiments.

[0030] The present application designs an inlaid carbon-ceramic brake disc, including a composite disc body and silicon carbide columns. The composite disc body is a carbon-carbon composite material composed of deposited carbon and carbon fibers obtained by densifying a carbon fiber preform. A plurality of inlaid holes are provided on the disc surface of the composite disc body; the silicon carbide columns are formed by embedding graphite columns into the inlaid holes, and under vacuum high-temperature conditions, molten silicon is infiltrated into the composite disc body to react with the graphite columns to generate silicon carbide columns; at the same time, molten silicon reacts with deposited carbon to generate silicon carbide, forming a carbon-ceramic material composed of carbon fibers, silicon carbide, remaining silicon, and remaining graphite.

[0031] Currently, there are mainly two types of friction surfaces for carbon-ceramic brake discs. One is without surface coating treatment, but has a low content of silicon carbide on the surface and a low friction coefficient. The other is with surface coating treatment, where the silicon carbide content on the brake disc surface is high and the friction coefficient is high, but there is a risk of peeling between the coating and the brake disc body. Therefore, considering the above technical defects, the applicant has made improvements to the carbon-ceramic brake disc. First, densification is carried out on the surface of the carbon fiber preform to convert the carbon fiber preform into a carbon-carbon composite material composed of deposited carbon and carbon fibers. Then, a number of embedding holes are opened on the surface of the composite disc body, and graphite columns are embedded into the embedding holes. The processed composite disc body together with silicon powder is placed in a crucible, and under vacuum and high-temperature conditions, the melted silicon is infiltrated into the composite disc body and the graphite columns, so that the composite disc body forms a carbon-ceramic material composed of carbon fibers, silicon carbide, remaining silicon, and remaining graphite, and the graphite columns react with silicon to form silicon carbide columns.

[0032] The composite disc body is turned into a carbon-ceramic material, which improves the oxidation resistance of the composite disc body and raises the oxidation resistance temperature of the composite disc body to about 2000 °C; it has high strength, high hardness, and corrosion resistance.

[0033] Setting silicon carbide columns in the embedding holes of the composite disc body can effectively increase the silicon carbide content on the surface of the composite disc body; with the increase in the silicon carbide content, the overall hardness can be improved, and the influence of high temperature on the braking performance of the brake disc is reduced, ensuring that the friction coefficient of the brake disc does not drop too quickly at high temperature, thus making the braking performance of the brake disc stable.

[0034] Only by increasing the silicon carbide content of the braking friction surface can the average density of the composite disc body be greatly reduced and the total mass of the composite disc body be reduced while ensuring the braking performance.

[0035] And with the consumption of the composite disc body surface and the silicon carbide columns during braking, that is, the consumption of the friction surface, the silicon carbide content of the friction surface always remains at a relatively stable ratio and will not suddenly drop a lot within a relatively wide range, resulting in a sudden drop in braking performance, thereby extending the service life of the brake disc.

[0036] Through the carbon-ceramic material of the composite disc body and the silicon carbide columns, the silicon carbide content of the friction surface can be adjusted by controlling the ratio of the silicon carbide columns, and then the friction coefficient of the brake disc friction surface can be adjusted. The ratio of the silicon carbide columns can be changed only by changing the diameter or the number of the silicon carbide columns, without the need to adjust the specific formula and processing technology, reducing the adjustment difficulty, so that brake discs with multiple friction coefficients can be prepared with the same formula and process.

[0037] An inlaid carbon-ceramic brake disc of the present application is prepared by the following method, including the following steps:

[0038] S1 Prepare the preform

[0039] Prepare a carbon fiber preform by alternately laying fiber layers and web layers and using a needling process;

[0040] S2. Deposition

[0041] The carbon fiber preform is densified by CVI deposition to produce deposited carbon on the surface of the preform, forming a carbon-carbon composite material composed of deposited carbon and carbon fibers;

[0042] S3. Machining

[0043] Machine the carbon fiber preform after being treated in S2, and open an inlay hole on the disk surface of the carbon fiber preform to obtain a composite disk;

[0044] S4. Inlay

[0045] Insert a graphite column into the inlay hole of the composite disk in S3, and polish the surface flat;

[0046] S5. Silicon infiltration

[0047] Put the composite disk in S4 into a crucible, under the condition of maintaining vacuum and high temperature, utilize the capillary force to infiltrate the melted silicon into the composite disk. The melted silicon reacts with the deposited carbon to form silicon carbide, forming a carbon-ceramic material composed of carbon fibers, silicon carbide, remaining silicon and remaining graphite on the disk surface of the composite disk; The melted silicon reacts with the graphite column to form a silicon carbide column; S6. Final machining

[0048] Machine the brake disk after silicon infiltration in S5 to obtain a finished brake disk.

[0049] The brake disk prepared by the above preparation method can effectively improve the friction coefficient, obtain a friction coefficient equivalent to or even better than that of a coated disk (a brake disk with a friction coating on the surface), and the preparation cost is lower than that of the coated disk, and there is a risk of coating peeling off on the surface of the coated disk. Specific embodiments

[0051] Example 1

[0052] Prepare a carbon fiber preform by alternately laying fiber layers and web layers and using a needling process, of a diameter.

[0053] Adopt the CVI deposition method to densify the carbon fiber preform. The selected gas source is natural gas to obtain a carbon / carbon composite disk.

[0054] On the above-mentioned disk body, 556 embedding holes with a diameter of 3 mm are drilled. The disk surface is divided into three circles from the inside to the outside. The embedding holes within each circle are distributed in a circular array. There are 111 embedding holes in the inner circle, and the center distance of the holes from the center of the disk body is 220 mm. There are 278 embedding holes in the outer circle, and the center distance of the holes from the center of the disk body is 280 mm. There are 167 embedding holes in the middle circle between the inner and outer circles, and the center distance of the holes from the center of the disk body is 250 mm; the depth of the embedding holes is 2.5 mm.

[0055] Embed graphite columns with a density of 2 g / cm 3 into the above-mentioned embedding holes, and use sandpaper to flatten the end protruding from the disk surface to obtain a composite disk body.

[0056] Put the composite disk body and silicon powder into a crucible. Under the conditions of a vacuum degree less than 2000 Pa and a temperature of 1600 °C, melt the silicon powder and allow it to penetrate into the composite disk body. A carbon-ceramic material composed of carbon fiber, silicon carbide, remaining silicon, and remaining graphite is formed on the surface of the composite disk body, and the graphite columns react to form silicon carbide columns. Perform final processing to obtain a carbon-ceramic brake disk embedded with silicon carbide columns.

[0057] Example 2

[0058] Use a fiber layer and a mesh tire layer to alternately lay layers, and use a needle punching process to prepare a carbon fiber preform, with a diameter.

[0059] Adopt the CVI deposition method to densify the carbon fiber preform. The selected gas source is natural gas to obtain a carbon / carbon composite material disk body.

[0060] On the above-mentioned disk body, 78 embedding holes with a diameter of 8 mm are drilled. The disk surface is divided into three circles from the inside to the outside. The embedding holes within each circle are distributed in a circular array. There are 16 embedding holes in the inner circle, and the center distance of the holes from the center of the disk body is 220 mm. There are 39 embedding holes in the outer circle, and the center distance of the holes from the center of the disk body is 280 mm. There are 23 embedding holes in the middle circle between the inner and outer circles, and the center distance of the holes from the center of the disk body is 250 mm; the depth of the embedding holes is 2.5 mm.

[0061] Embed graphite columns with a density of 2 g / cm 3 into the above-mentioned embedding holes, and use sandpaper to flatten the end protruding from the disk surface to obtain a composite disk body.

[0062] Put the composite disk body and silicon powder into a crucible. Under the conditions of a vacuum degree less than 2000 Pa and a temperature of 1600 °C, melt the silicon powder and allow it to penetrate into the composite disk body. A carbon-ceramic material composed of carbon fiber, silicon carbide, remaining silicon, and remaining graphite is formed on the surface of the composite disk body, and the graphite columns react to form silicon carbide columns. Perform final processing to obtain a carbon-ceramic brake disk embedded with silicon carbide columns.

[0063] Example 3

[0064] The carbon fiber preform is prepared by alternately laying fiber layers and web tire layers and using the needling process, and the diameter is...

[0065] The carbon fiber preform is densified by CVI deposition. The selected gas source is natural gas to obtain a carbon / carbon composite disk body.

[0066] Thirty-five embedding holes with a diameter of 12 mm are drilled on the above disk. The disk surface is divided into three circles from the inside to the outside. The embedding holes within each circle are distributed in a circular array. There are 7 embedding holes in the inner circle, and the center of the circle is 220 mm away from the center of the disk body. There are 18 embedding holes in the outer circle, and the center of the circle is 280 mm away from the center of the disk body. There are 10 embedding holes in the middle circle between the inner and outer circles, and the center of the circle is 250 mm away from the center of the disk body; the depth of the embedding hole is 2.5 mm.

[0067] Graphite columns with a density of 2 g / cm 3 are embedded into the above embedding holes, and one end protruding from the disk surface is flattened with sandpaper to obtain a composite disk body.

[0068] The composite disk body and silicon powder are placed in a crucible. Under the conditions of a vacuum degree less than 2000 Pa and a temperature of 1600 °C, the silicon powder is melted and penetrates into the composite disk body, and a carbon-ceramic material composed of carbon fiber, silicon carbide, remaining silicon and remaining graphite is formed on the surface of the composite disk body. The graphite columns react to form silicon carbide columns. Final processing is carried out to obtain a carbon-ceramic brake disk embedded with silicon carbide columns.

[0069] Example 4

[0070] The carbon fiber preform is prepared by alternately laying fiber layers and web tire layers and using the needling process, and the diameter is...

[0071] The carbon fiber preform is densified by CVI deposition. The selected gas source is natural gas to obtain a carbon / carbon composite disk body.

[0072] Twenty-two embedding holes with a diameter of 15 mm are drilled on the above disk. The disk surface is divided into three circles from the inside to the outside. The embedding holes within each circle are distributed in a circular array. There are 7 embedding holes in the inner circle, and the center of the circle is 220 mm away from the center of the disk body. There are 11 embedding holes in the outer circle, and the center of the circle is 280 mm away from the center of the disk body. There are 7 embedding holes in the middle circle between the inner and outer circles, and the center of the circle is 250 mm away from the center of the disk body; the depth of the embedding hole is 2.5 mm.

[0073] Graphite columns with a density of 2 g / cm 3 are embedded into the above embedding holes, and one end protruding from the disk surface is flattened with sandpaper to obtain a composite disk body.

[0074] Put the composite disk body and silicon powder into a crucible. Under the conditions of a vacuum degree less than 2000 Pa and a temperature of 1600 °C, melt the silicon powder and allow it to penetrate into the composite disk body, forming a carbon-ceramic material composed of carbon fiber, silicon carbide, remaining silicon, and remaining graphite on the surface of the composite disk body, while the graphite column reacts to form a silicon carbide column. Carry out final processing to obtain a carbon-ceramic brake disk with silicon carbide columns embedded therein.

[0075] Example 5

[0076] The fiber layer and the mesh tire layer are alternately laminated, and a carbon fiber preform is prepared using the needle punching process, with a diameter of...

[0077] Adopt the CVI deposition method to densify the carbon fiber preform. The selected gas source is natural gas to obtain a carbon / carbon composite disk body.

[0078] Drill 13 embedding holes with a diameter of 20 mm on the above-mentioned disk body. The disk surface is divided into three circles from the inside to the outside. The embedding holes within each circle are distributed in an annular array. There are 3 embedding holes in the inner circle, and the center of the circle is 220 mm away from the center of the disk body. There are 6 embedding holes in the outer circle, and the center of the circle is 280 mm away from the center of the disk body. There are 4 embedding holes in the middle circle between the inner circle and the outer circle, and the center of the circle is 250 mm away from the center of the disk body; the depth of the embedding holes is 2.5 mm.

[0079] Embed graphite columns with a density of 2 g / cm 3 into the above-mentioned embedding holes, and use sandpaper to flatten the end protruding from the disk surface to obtain a composite disk body.

[0080] Put the composite disk body and silicon powder into a crucible. Under the conditions of a vacuum degree less than 2000 Pa and a temperature of 1600 °C, melt the silicon powder and allow it to penetrate into the composite disk body, forming a carbon-ceramic material composed of carbon fiber, silicon carbide, remaining silicon, and remaining graphite on the surface of the composite disk body, while the graphite column reacts to form a silicon carbide column. Carry out final processing to obtain a carbon-ceramic brake disk with silicon carbide columns embedded therein.

[0081] Use the LK3900 test bench to conduct friction coefficient tests. When using the same friction pads, the friction coefficients are shown in Table 1:

[0082] Table 1 Performance test data of Examples 1 - 5

[0083]

[0084] According to Embodiments 1-5 and Table 1, it can be seen that by reducing the cross-sectional area of the silicon carbide columns and increasing the number of silicon carbide columns, while keeping the area occupied by the silicon carbide columns on the brake disc surface unchanged, as the diameter of the silicon carbide columns increases, the minimum friction coefficient of the brake disc shows the fluctuations in Table 1. When 556 graphite columns with a diameter of 3 mm are used to form silicon carbide columns in Embodiment 1, its friction coefficient is relatively high and the wear rate is very low. However, due to the large number of inlaid holes, the processing cost is high, and the diameter of the graphite columns is very small, which requires higher processing accuracy and is prone to breakage, resulting in a higher cost.

[0085] Compared with Embodiment 1, in Embodiment 2, by greatly increasing the diameter of the graphite columns to reduce the number of graphite columns, the processing accuracy is reduced and the processing cost is lowered; at the same time, the friction coefficient does not decrease significantly; while in Embodiment 3, the diameter of the graphite columns is increased again, the processing cost is reduced, but the friction coefficient increases significantly and the wear rate does not increase significantly.

[0086] In Embodiments 4 and 5, the diameter of the graphite columns is further increased, but their friction coefficients decrease significantly and the wear rates increase significantly; therefore, in this application, the silicon carbide columns formed by graphite columns with a diameter of 3-12 mm in Embodiments 1-3 can make the performance of the brake disc more excellent.

[0087] Embodiment 6

[0088] The difference between this embodiment and Embodiment 3 is that the density of the graphite columns in this embodiment is 1.5 g / cm 3 .

[0089] Embodiment 7

[0090] The difference between this embodiment and Embodiment 3 is that the density of the graphite columns in this embodiment is 1.6 g / cm 3 .

[0091] Embodiment 8

[0092] The difference between this embodiment and Embodiment 3 is that the density of the graphite columns in this embodiment is 1.7 g / cm 3 .

[0093] Embodiment 9

[0094] The difference between this embodiment and Embodiment 3 is that the density of the graphite columns in this embodiment is 1.8 g / cm 3 .

[0095] Embodiment 10

[0096] The difference between this embodiment and Embodiment 3 is that the density of the graphite columns in this embodiment is 1.9 g / cm 3 .

[0097] The friction coefficient was tested using the LK3900 test rig. With the same friction pads, the friction coefficients are shown in Table 2 as follows:

[0098] Table 2 Performance test data of Examples 6 - 10

[0099]

[0100] According to Example 3, Examples 6 - 10 and Table 2, it can be seen that by increasing the density of the graphite columns, within the range of the density of the graphite columns being 1.5 - 2.0 g / cm 3 , as the density of the graphite columns increases, the friction coefficient of the prepared brake disc first decreases and then increases. The wear rate decreases as the density of the graphite columns increases. Within a reasonable range of the friction coefficient, it is preferred to use graphite columns with a higher density to prepare the brake disc, which can extend the service life of the brake disc. When the density of the graphite columns is lower than 1.7 g / cm 3 , the friction coefficient increases significantly and the wear rate also increases significantly. Within a reasonable range, the density of the graphite columns should be increased to reduce the wear rate and keep the friction coefficient within a reasonable range.

[0101] Example 11

[0102] The difference between this example and Example 3 is that in this example, 70 inlaid holes with a diameter of 12 mm are drilled on the disc body. Among them, 14 inlaid holes are in the inner circle, 36 inlaid holes are in the outer circle, and 20 inlaid holes are in the middle circle between the inner and outer circles.

[0103] Example 12

[0104] The difference between this example and Example 3 is that in this example, 105 inlaid holes with a diameter of 12 mm are drilled on the disc body. Among them, 21 inlaid holes are in the inner circle, 54 inlaid holes are in the outer circle, and 30 inlaid holes are in the middle circle between the inner and outer circles.

[0105] Example 13

[0106] The difference between this example and Example 3 is that in this example, 140 inlaid holes with a diameter of 12 mm are drilled on the disc body. Among them, 28 inlaid holes are in the inner circle, 72 inlaid holes are in the outer circle, and 40 inlaid holes are in the middle circle between the inner and outer circles.

[0107] Example 14

[0108] The difference between this example and Example 3 is that in this example, 175 inlaid holes with a diameter of 12 mm are drilled on the disc body. Among them, 35 inlaid holes are in the inner circle, 90 inlaid holes are in the outer circle, and 50 inlaid holes are in the middle circle between the inner and outer circles.

[0109] The friction coefficient was tested using the LK3900 bench. With the same friction pads, the friction coefficients are shown in Table 3 as follows:

[0110] Table 3 Performance test data of Examples 11 - 14

[0111]

[0112] As the number of inlaid holes increases, the proportion of the inlaid area in the disk surface area increases correspondingly. Since the area of the inlaid hole is the area of the finally formed silicon carbide column, the area of silicon carbide in the disk surface area increases correspondingly. Silicon carbide plays a role in increasing the friction coefficient and reducing the wear rate during the friction process. Therefore, it can be seen from Example 3, Examples 11 - 14, and Table 3 that the minimum friction coefficient and the average friction coefficient gradually increase, and the minimum wear rate and the average wear rate gradually decrease. It can be seen from Example 3, Example 11, Example 12, and Table 3 that when the proportion of the inlaid area in the disk surface area increases from 10% to 20%, 30%, the increase in the friction coefficient and the decrease in the wear rate are relatively large; while it can be seen from Example 12, Example 13, Example 14, and Table 3 that when the proportion of the inlaid area in the disk surface area increases from 30% to 40%, 50%, the increase in the friction coefficient and the decrease in the wear rate are relatively small, and when the proportion of the inlaid area in the disk surface area increases from 40% to 50%, the minimum friction coefficient and the minimum wear rate hardly change; however, manpower costs and time costs are incurred in processing the inlaid holes. Therefore, setting the proportion of the inlaid area in the disk surface area at about 30% can obtain a better friction coefficient and a lower wear rate, while ensuring that the processing cost is not too high.

[0113] The above are all preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An inlaid carbon-ceramic brake disc, characterized in that, It includes a composite disk body and silicon carbide columns. The composite disk body is a carbon-carbon composite material composed of deposited carbon and carbon fibers obtained by densifying a carbon fiber preform. A number of embedding holes are provided on the disk surface of the composite disk body; the silicon carbide columns are formed by embedding graphite columns into the embedding holes, and under vacuum and high-temperature conditions, molten silicon is infiltrated into the composite disk body to react with the graphite columns to generate silicon carbide columns; at the same time, molten silicon reacts with the deposited carbon to generate silicon carbide, forming a carbon-ceramic material composed of carbon fibers, silicon carbide, remaining silicon and remaining graphite.

2. The inlaid carbon-ceramic brake disc according to claim 1, wherein The embedding holes form several concentric circles with the disk surface of the composite disk body on the disk surface of the composite disk body, and the embedding holes located within each circle are distributed in an annular array around the center of the circle.

3. The inlaid carbon-ceramic brake disc according to claim 1, characterized in that, The diameter of the embedding holes is set to 3-20 mm, and the depth of the embedding holes is greater than 2 mm.

4. The inlaid carbon-ceramic brake disc according to claim 1, wherein The hole area of the embedding holes accounts for 10-50% of the disk surface area of the composite disk body.

5. The inlaid carbon-ceramic brake disc according to claim 1, characterized in that, The carbon fiber preform is prepared by alternately laying fiber layers and mesh tire layers and using a needling process.

6. The inlaid carbon-ceramic brake disc according to claim 1, characterized in that, The density of the graphite column is set at 1.5 - 2.0 g / cm 3 .

7. The inlaid carbon-ceramic brake disc according to claim 1, characterized in that, The particle size of the silicon is set at 30-300 mesh, and the purity is greater than 99%; the mass ratio of the silicon to the total mass of the composite disk body and the graphite column before silicon infiltration is 1-2:

1.

8. The inlaid carbon-ceramic brake disc according to claim 1, characterized in that, The mass ratio of the deposited carbon to the carbon fiber is 2-4:

1.

9. A preparation method of an inlaid carbon-ceramic brake disc, characterized in that, It includes the following steps: S1. Prepare the preform Alternately lay fiber layers and mesh tire layers and use a needling process to prepare a carbon fiber preform; S2. Deposition The carbon fiber preform is densified by CVI deposition to generate deposited carbon on the surface of the preform, forming a carbon-carbon composite material composed of deposited carbon and carbon fibers; S3. Machining Machine the carbon fiber preform after being treated in S2, and open embedding holes on the disk surface of the carbon fiber preform to obtain a composite disk body; S4. Embedding Embed graphite columns into the embedding holes of the composite disk body in S3 and polish the surface flat; S5. Silicon infiltration Put the composite disk body in S4 into a crucible, and under vacuum and high-temperature conditions, use the capillary force to infiltrate the molten silicon into the composite disk body. The molten silicon reacts with the deposited carbon to generate silicon carbide, forming a carbon-ceramic material composed of carbon fibers, silicon carbide, remaining silicon and remaining graphite on the disk surface of the composite disk body; the molten silicon reacts with the graphite columns to form silicon carbide columns; S6. Final machining Machine the brake disk after silicon infiltration in S5 to obtain a finished brake disk.

10. The preparation method of an inlaid carbon-ceramic brake disc according to claim 9, characterized in that: The reaction temperature in S4 is set at 1500-1700 °C, the reaction vacuum degree is less than 2000 Pa, and the reaction time is set at 0.5-5 h.

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