CN115823151A - Carbon/ceramic brake disc with sandwich structure - Google Patents
Carbon/ceramic brake disc with sandwich structure Download PDFInfo
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- CN115823151A CN115823151A CN202310113037.4A CN202310113037A CN115823151A CN 115823151 A CN115823151 A CN 115823151A CN 202310113037 A CN202310113037 A CN 202310113037A CN 115823151 A CN115823151 A CN 115823151A
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Abstract
The invention relates to a carbon/ceramic brake disc with a sandwich structure, and belongs to the technical field of vehicle brake parts. The brake disc is a sandwich structure sequentially composed of a friction functional layer, a mechanical functional layer and the friction functional layer, wherein the friction functional layer is connected with the mechanical functional layer through mortise and tenon joint, and specifically, the brake disc is prepared by carrying out pyrolysis and silicon infiltration reaction on a sandwich structure matrix formed by a carbon cloth composite layer, a short fiber layer and a carbon cloth composite layer through mould pressing. The brake disc disclosed by the invention has excellent overall mechanical property, friction and wear resistance and long service life, is prepared by solid-state environment mould pressing, cracking and infiltration, and has the advantages of simple preparation process, short production period, low production cost and good application prospect.
Description
Technical Field
The invention relates to a carbon/ceramic brake disc with a sandwich structure, and belongs to the technical field of vehicle brake parts.
Background
As a new generation of brake materials, C/C-SiC (carbon/ceramic) brake materials were first applied in the field of aviation brake systems, and then subsequently applied in the fields of high-speed trains, high-grade sports cars, racing cars, and the like. The C/C-SiC brake material has excellent high temperature resistance and friction performance, the density of the C/C-SiC brake material is only about 1/3 of that of a steel brake material, the unsprung mass of an automobile can be obviously reduced, and the fuel saving level and the control performance of the automobile are improved; in addition, the brake pad has the advantages of long service life, low maintenance cost, high wet friction coefficient, no dust pollution and the like, and is a new generation of lightweight automobile brake material with wide market prospect.
At present, the preparation of C/C-SiC ceramic-based friction materials at home and abroad mainly focuses on adopting long fibers to carry out chemical vapor infiltration, fused siliconizing or liquid polymer impregnation and the like, and the C/C-SiC ceramic-based friction materials have the defects of long production period, high production cost and the like, and can only be used in the fields of part of high-grade sports cars, racing cars and the like. In order to widen the application of the carbon/ceramic brake disc in the field of automobile braking, a preparation method which is simple in production process, long in service life and low in cost is needed to be developed, and the prepared carbon/ceramic brake disc has safe and reliable performance.
The short-fiber carbon/ceramic brake disc is prepared by die pressing, cracking and infiltration of short-cut carbon fibers with a certain length, resin and additives in a liquid or solid environment, and has the advantages of good performance, high efficiency, low cost, short period and the like. The biggest bottleneck of the application of the short fiber carbon/ceramic brake disc at present is the realization of the preparation process, and the high performance and the low production cost of the product are considered at the same time. The relevant data are as follows:
chinese patent CN108658613A 'a method for preparing an automobile brake disc by short fiber mould pressing', short carbon fibers, resin powder and an additive are subjected to mould pressing, cracking and infiltration in a liquid environment to prepare the brake disc, compared with a long fiber disc, the preparation method is short in preparation period and low in production cost, but compared with a solid mould pressing method, the production method is relatively more in production steps, high in batch production equipment cost and relatively poor in production environment, and meanwhile, the problem that the short fiber disc is prone to edge breakage exists on the surface layer of a product, so that the service life of the product is influenced.
Chinese patent CN113548902a "a method for preparing a carbon fiber reinforced silicon carbide brake disc" is to prepare a brake disc by solid molding, cracking and infiltration of short carbon fibers, resin powder and additives, and compared with a brake disc prepared by liquid molding, cracking and infiltration, the brake disc is directly molded and shaped under solid conditions and then cracked and infiltrated, thereby simplifying the processing technology, but the problem of easy edge breakage of the surface layer of the short fiber brake disc exists, and the braking effect and the service life of the brake disc are affected.
Chinese patent CN107266075A 'a C/C-SiC composite material and a preparation method and application thereof' adopt a multilayer symmetrical gradient structure, wherein a 0.5-12 mm short carbon fiber layer, a 3-25 mm short carbon fiber layer and a carbon fiber cloth layer are sequentially arranged from an outer layer to an inner layer, the C/C-SiC composite material is prepared by solid state die pressing, cracking and infiltration, the processing technology is simple, but the bonding force between the multilayer structures is weak, particularly the bonding force between the short carbon fiber layer and the carbon fiber cloth layer is weak, the layer-layer interface connection is only adhered by resin, the bonding force is poor, and the C/C-SiC composite material is easy to be debonded and layered when being stressed. Meanwhile, as the fiber content is gradually reduced from the inner layer to the outer layer, the product density is gradually reduced from inside to outside, so that the surface strength of the C/C-SiC composite material is insufficient, the phenomenon of collapse is easy to occur, and the service life is influenced.
Disclosure of Invention
Aiming at the problems of the conventional short fiber carbon/ceramic brake disc, the invention provides the carbon/ceramic brake disc with the sandwich structure, the brake disc is of the sandwich structure consisting of a friction functional layer, a mechanical functional layer and the friction functional layer, and the friction functional layer and the mechanical functional layer are connected through mortise and tenon joint, so that the brake disc has excellent overall mechanical property, friction and wear resistance, long service life, short preparation period, low cost and good application prospect.
The purpose of the invention is realized by the following technical scheme.
A carbon/ceramic brake disc with a sandwich structure is a sandwich structure which is sequentially composed of a friction functional layer, a mechanical functional layer and a friction functional layer, wherein the friction functional layer and the mechanical functional layer are connected through mortise and tenon, and the carbon/ceramic brake disc is prepared by performing pyrolysis and silicon infiltration reactions on a sandwich structure substrate which is formed by a carbon cloth composite layer, a short fiber layer and a carbon cloth composite layer through mould pressing, wherein the carbon cloth composite layer corresponds to the friction functional layer and the short fiber layer corresponds to the mechanical functional layer;
the carbon cloth composite layer is formed by stacking a plurality of layers of pre-impregnated carbon cloth, and connecting holes for mortise and tenon connection are processed on the surface of the carbon cloth composite layer;
the short fiber layer is a short fiber premix prepared from short carbon fibers, resin and additives, and when the sandwich structure matrix is formed by mould pressing, the short fiber premix can enter into a connecting hole of the carbon cloth composite layer, so as to form mortise and tenon connection;
wherein the mass ratio of the carbon cloth to the chopped carbon fibers is 1: (1~3), the mass ratio of the chopped carbon fibers, the resin and the additive is 1: (1~3): (0.5 to 2.0) and the density of the sandwich structure matrix is 1.2 to 1.7g/cm 3 The density of the carbon/ceramic brake disc with the sandwich structure is 2.0 to 2.5g/cm 3 The additive is at least one of graphite powder, carbon powder, silicon carbide powder, boron powder, copper powder, iron powder, silicon dioxide powder, graphene, magnesium stearate and hexamethylenetetramine.
Further, the cracking operation of the sandwich structure matrix is as follows: under the protection atmosphere of nitrogen or inert gas, the sandwich structure substrate is carbonized at high temperature of 700 to 1000 ℃ to obtain the sandwich structure substrate with the density of 1.1 to 1.6g/cm 3 The carbonized matrix of (2)(ii) a And (3) under the protection atmosphere of nitrogen or inert gas, opening the pores of the carbonized matrix at the high temperature of 1800-2500 ℃ to obtain the porous carbonized matrix with the aperture ratio of 15-40%.
Further, the carbon cloth is impregnated with liquid resin and then dried at 70 to 80 ℃ to form the prepreg carbon cloth, the carbon cloth is preferably plain woven carbon cloth, and the liquid resin comprises but is not limited to one or more of phenolic resin, epoxy resin, furfuryl ketone resin, cyanate resin, furan resin, vinyl resin and benzoxazine resin.
Further, the surface area of the carbon cloth composite layer is gradually reduced along the thickness direction, the reduction proportion is 5-20% each time, the size of each 5-20 layers of the prepreg carbon cloth is in the same specification (namely the size of each 5-20 layers of the prepreg carbon cloth is changed once), and at the moment, a gradient slope formed by the carbon cloth composite layer and the surface with the smallest surface area are both in contact with the short fiber layer.
Further, the shape of the connecting holes on the carbon cloth composite layer can be circular, oval, triangular, quadrilateral, tooth-shaped, crescent-shaped, other polygons and the like, the distance between two adjacent connecting holes is 10 to 100mm, the connecting holes can be regularly arranged or irregularly arranged, and the sum of the open areas of all the connecting holes is 3 to 10 percent of the surface area of the carbon cloth in contact with the short fiber layer (if the surface area of the carbon cloth in the carbon cloth composite layer is gradually reduced, the sum is 3 to 10 percent of the minimum surface area of the carbon cloth in the carbon cloth composite layer).
The chopped carbon fibers are composed of two or more types of chopped carbon fibers with different lengths, the average length is not more than 30mm, and the length difference of the two types of chopped carbon fibers with the closest lengths is 5-25mm.
Further, the resin in the short fiber layer includes, but is not limited to, one or more of phenolic resin, epoxy resin, furfuryl ketone resin, cyanate ester resin, furan resin, vinyl resin, and benzoxazine resin.
Further, the concrete operation of forming the sandwich structure base body by die pressing is as follows: and sequentially filling the carbon cloth composite layer, the short fiber layer and the carbon cloth composite layer into a mold, and then carrying out hot press molding, wherein the hot press temperature is 180 to 220 ℃, the hot press pressure is 28 to 32MPa, and the heat and pressure maintaining time is 45 to 60min, so as to obtain the sandwich structure base. Wherein the temperature of the mold is preferably raised to 180 to 220 ℃ at a temperature raising rate of 5 to 10 ℃/min, and the pressure is increased to 28 to 32MPa before 130 ℃.
Furthermore, during the silicon infiltration reaction, silicon powder with the particle size of 20 to 100 mu m is selected, and the infiltration temperature is 1450 to 1800 ℃.
Has the advantages that:
(1) According to the carbon/ceramic brake disc with the sandwich structure, the two surface layers are the carbon cloth reinforcing and toughening layers, the carbon cloth has the characteristics of high strength and high toughness, and can furthest retain the meshing effect with a mating part in the process of opposite grinding, so that abrasive wear (micro-protrusions on the surface of the brake disc are sheared and crushed under the strong friction effect to generate micro-particles, the hard particles have a strong plough action on the friction surface to generate abrasive wear) can exist and play a role all the time, and the braking effect is obvious and durable. And the high toughness of the carbon cloth enables the brake disc to exert the braking effect in the braking process, and the risk of local collapse or collapse is greatly reduced due to strong impact, so that the side effect of local braking failure of the short fiber carbon/ceramic brake disc can be effectively improved, the braking effect can be ensured during high-frequency braking, and the service life of the brake disc can be prolonged.
(2) The sandwich structure carbon/ceramic brake disc has the advantages that the core layer between the two surface layers is a short fiber compression connecting layer, the core layer mainly bears the transverse shear stress transmitted by the composite carbon cloth layer, and meanwhile, the composite carbon cloth layer on the upper surface layer and the composite carbon cloth layer on the lower surface layer are stabilized to prevent local yielding and instability, so that the load resistance of the whole brake disc is improved. In addition, the density of the core short fiber layer is slightly lower than that of the surface composite carbon cloth layer, and a certain anti-seismic effect can be achieved.
(3) In the carbon/ceramic brake disc with the sandwich structure, the carbon cloth and the carbon cloth in the surface layer, and the composite carbon cloth layer and the core short fiber layer in the surface layer are integrally formed in a tenon-and-mortise structure through the connecting holes, so that the carbon cloth and the carbon cloth, the composite carbon cloth layer and the short fiber layer are strong in binding force and strong in load resistance, are uniform in stress and are not easy to debond and delaminate, and the overall mechanical property of the brake disc is improved.
(4) The surface size of the carbon cloth composite layer is reduced in an equal proportion along the thickness direction of the carbon cloth composite layer, the formed gradient inclined plane area increases the bonding area of the carbon cloth composite layer and the short fiber layer, the bonding force between the carbon cloth composite layer and the short fiber layer is enhanced, and the overall mechanical property of the brake disc is further improved.
(5) The carbon/ceramic brake disc with the A-B-A type sandwich structure is prepared by mould pressing, cracking and infiltration in ase:Sub>A solid environment, resin can be promoted to fully fill the mould in the mould pressing process, the prepared mould pressing sandwich structure matrix is uniform in material quality, and after carbonization, hole opening and siliconizing, the material uniformity of each part of the brake disc is good, and the friction effect is uniform and stable. Meanwhile, the preparation process and the operation steps are simple, each dry powder raw material is convenient to transport and store, the production environment is clean and tidy, and the method is suitable for large-scale industrial production.
(6) The sandwich structure matrix prepared by the method can effectively remove organic components in the matrix through high-temperature carbonization at 700-1000 ℃, so that the phenolic resin of a continuous phase is converted into resin carbon, a reaction base point is provided for ceramic formation, and a siliconizing effect is ensured; and then, through high-temperature treatment at 1800 to 2500 ℃, impurities in the matrix of the sandwich structure can be further removed, the opening rate of the matrix is improved, and simultaneously thermodynamically unstable carbon atoms are orderly converted into a graphite crystal structure from a disordered layer structure, so that a siliconizing channel in the matrix is increased. The aperture ratio is too high, which indicates that the content of the phenolic resin of the matrix is high, the resin shrinkage rate is high during high-temperature carbonization, the matrix is easy to crack, and the performance of the brake disc is not favorably improved; the aperture ratio is too low, the molten silicon is difficult to enter the matrix for reaction through the capillary action, the siliconizing effect is not ideal, the brake disc is not uniform in material, and the density and the mechanical property do not reach the standard. Researches show that the opening rate is adjusted within the range of 15 to 40 percent, so that the siliconizing effect and the mechanical property of the brake disc can be ensured.
In conclusion, the carbon/ceramic brake disc with the A-B-A type sandwich structure is prepared by die pressing, cracking and infiltration in ase:Sub>A solid environment, the production cost of the carbon/ceramic brake disc is effectively reduced, the production period is shortened, the processing technology is simplified, and meanwhile, the prepared brake disc has good friction and wear performance, strong overall mechanical performance, long service life and good market application prospect.
Drawings
Fig. 1 is a schematic process diagram of the process for preparing a carbon/ceramic brake disc with a sandwich structure in example 1.
The composite material comprises 1-a carbon cloth composite layer, 2-a short fiber layer, 3-a connecting hole, 4-a friction functional layer and 5-a mechanical functional layer.
Detailed Description
The present invention is further illustrated by the following detailed description, wherein the processes are conventional unless otherwise specified, and the starting materials are commercially available from a public source without further specification.
Example 1
(1) Mixing chopped carbon fibers with the lengths of 10mm and 20mm, phenolic resin powder and graphite powder according to the ratio of 1:1: uniformly mixing the components in a mass ratio of 0.5 to obtain a short fiber premix;
selecting 12K plain carbon cloth, impregnating the plain carbon cloth with liquid phenolic resin, and drying the plain carbon cloth at 80 ℃ to form pre-impregnated carbon cloth; stacking 30 layers of pre-impregnated carbon cloth together, reducing and cutting the surface size of the carbon cloth along the thickness direction of the pre-impregnated carbon cloth according to the appearance of a brake disc, reducing the size of the carbon cloth by 5 percent, punching holes in each 10 layers of pre-impregnated carbon cloth to form connecting holes 3 (shown in figure 1) for mortise and tenon connection, wherein the aperture of each connecting hole 3 is 10mm, the hole interval is 30mm, and the sum of the opening areas of all the connecting holes 3 is 5 percent of the minimum surface area of the carbon cloth in the carbon cloth composite layer, so that the carbon cloth composite layer 1 is formed;
(2) Firstly, laying a carbon cloth composite layer 1 in a metal matched die, wherein the minimum size surface of the carbon cloth composite layer 1 faces upwards, then laying a layer of short fiber premix, namely a short fiber layer 2, on the carbon cloth composite layer 1, laying a layer of carbon cloth composite layer 1 on the short fiber premix, wherein the minimum size surface of the carbon cloth composite layer 1 faces downwards, and the mass ratio of the carbon cloth to the short carbon fiber is 1:1; after the die filling is finished, the die is placed on a hydraulic press for hot-press forming, wherein the temperature of the die is increased to 200 ℃ at the temperature increase rate of 5 ℃/min, the pressure is increased to 30MPa before 130 ℃, the temperature and the pressure are kept for 60min, and the short fiber premix can enter the connecting hole 3 in the carbon cloth composite layer 1 in the hot-pressing process to ensure that the carbon cloth composite layer 1 and the short fiber premix enter the connecting hole 3 in the carbon cloth composite layer 1 to ensure that the carbon cloth composite layer 1 and the short fiber premix can be subjected to hot-press formingMortise and tenon connection is formed between the fiber layers 2 (as shown in figure 1), and the density is 1.50g/cm 3 The sandwich structure substrate of (1);
(3) Under Ar protective atmosphere, the sandwich structure substrate is carbonized at high temperature of 700 ℃ to obtain the density of 1.35g/cm 3 The carbonized substrate of (2);
(4) Under Ar protective atmosphere, placing the carbonized matrix at 1800 ℃ for high-temperature tapping to obtain a porous carbonized matrix with 25% of tapping rate;
(5) Selecting silicon powder with particle size of 40 μm as infiltrant, placing the porous carbonized matrix in the silicon powder, and performing silicon infiltration reaction at 1500 deg.C to obtain a product with density of 2.2g/cm 3 The carbon/ceramic brake disc with the sandwich structure is shown in figure 1, at the moment, the upper surface layer and the lower surface layer of the brake disc are friction functional layers 4, the core part is a mechanical functional layer 5, and the friction functional layers 4 and the mechanical functional layer 5 are in mortise and tenon connection.
The prepared carbon/ceramic brake disc with the sandwich structure is subjected to mechanical property and frictional wear performance tests, and the test results are detailed in table 1. The density is according to the standard GB/T1966, the bending test is according to the standard B/T6569, the compression test is according to the standard GB/T34559, the tensile test is according to the standard GB/T33501, the interlaminar shear is according to the standard ASTM D2344/D234M-13, the impact toughness is according to the standard GB/T14389, and the friction and wear test is according to the standard SAEJ2522-2014.
TABLE 1
Example 2
(1) Mixing the chopped carbon fibers with the lengths of 5mm, 10mm and 15mm, phenolic resin powder, graphite powder and silicon carbide powder according to the weight ratio of 1:1:0.25: uniformly mixing the components in a mass ratio of 0.25 to obtain a short fiber premix;
selecting 12K plain carbon cloth, impregnating the plain carbon cloth with liquid phenolic resin liquid resin, and drying at 75 ℃ to form pre-impregnated carbon cloth; stacking 24 layers of pre-impregnated carbon cloth together, reducing and cutting the surface size of the carbon cloth along the thickness direction of the pre-impregnated carbon cloth according to the appearance of a brake disc, reducing the size of the carbon cloth according to a proportion of 10%, punching holes in each 8 layers of pre-impregnated carbon cloth into the same specification size to form connecting holes 3 for mortise and tenon connection, wherein the aperture of each connecting hole 3 is 15mm, the hole interval is 50mm, and the sum of the areas of the holes of all the connecting holes 3 is 5% of the minimum surface area of the carbon cloth in the carbon cloth composite layer, so that the carbon cloth composite layer 1 is formed;
(2) Firstly, laying a carbon cloth composite layer 1 in a metal matched die, wherein the minimum size surface of the carbon cloth composite layer 1 faces upwards, then laying a layer of short fiber premix, namely a short fiber layer 2, on the carbon cloth composite layer 1, laying a layer of carbon cloth composite layer 1 on the short fiber premix, wherein the minimum size surface of the carbon cloth composite layer 1 faces downwards, and the mass ratio of the carbon cloth to the short carbon fiber is 1:1; after the die filling is finished, the die is placed on a hydraulic press for hot-press forming, wherein the die is heated to 200 ℃ at the heating rate of 5 ℃/min, the pressure is increased to 30MPa before 130 ℃, the heat preservation and pressure maintenance are carried out for 45min, and the short fiber premix enters into the connecting holes 3 in the carbon cloth composite layer 1 in the hot-press process to form mortise and tenon connection between the carbon cloth composite layer 1 and the short fiber layer 2, so that the density is 1.60g/cm 3 The sandwich structure substrate of (1);
(3) Under Ar protective atmosphere, the sandwich structure substrate is carbonized at high temperature of 900 ℃ to obtain the density of 1.40g/cm 3 The carbonized substrate of (2);
(4) Under Ar protective atmosphere, placing the carbonized matrix at the high temperature of 2000 ℃ for opening pores to obtain a porous carbonized matrix with the aperture ratio of 20 percent;
(5) Selecting silicon powder with particle size of 40 μm as infiltrant, placing porous carbonized matrix in the infiltrant silicon powder, and performing silicon infiltration reaction at 1600 deg.C to obtain the final product with density of 2.1g/cm 3 The carbon/ceramic brake disc with the sandwich structure has the advantages that the upper surface layer and the lower surface layer of the brake disc are friction functional layers 4, the core part is a mechanical functional layer 5, and the friction functional layer 4 is in mortise and tenon connection with the mechanical functional layer 5.
The prepared carbon/ceramic brake disc with the sandwich structure is subjected to mechanical property and frictional wear performance tests, and the test results are detailed in table 2. The density is according to the standard GB/T1966, the bending test is according to the standard B/T6569, the compression test is according to the standard GB/T34559, the tensile test is according to the standard GB/T33501, the interlaminar shear is according to the standard ASTM D2344/D234M-13, the impact toughness is according to the standard GB/T14389, and the friction and wear test is according to the standard SAEJ2522-2014.
TABLE 2
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a carbon/pottery brake disc of sandwich structure which characterized in that: the friction functional layer and the mechanical functional layer are connected through mortise and tenon, and specifically, the friction functional layer is prepared by performing pyrolysis and silicon infiltration reaction on a sandwich structure matrix formed by a carbon cloth composite layer, a short fiber layer and a carbon cloth composite layer through mould pressing;
the carbon cloth composite layer is formed by stacking a plurality of layers of pre-impregnated carbon cloth, and connecting holes for mortise and tenon connection are processed on the surface of the carbon cloth composite layer;
the short fiber layer is a short fiber premix prepared from short carbon fibers, resin and additives, and when the sandwich structure matrix is formed by mould pressing, the short fiber premix can enter into a connecting hole of the carbon cloth composite layer, so as to form mortise and tenon connection;
wherein the mass ratio of the carbon cloth to the chopped carbon fibers is 1: (1~3), the mass ratio of the chopped carbon fibers, the resin and the additive is 1: (1~3): (0.5 to 2.0), and the density of the sandwich structure matrix is 1.2 to 1.7g/cm 3 The density of the carbon/ceramic brake disc with the sandwich structure is 2.0 to 2.5g/cm 3 The additive is at least one of graphite powder, carbon powder, silicon carbide powder, boron powder, copper powder, iron powder, silicon dioxide powder, graphene, magnesium stearate and hexamethylenetetramine.
2. According to claim 1The carbon/ceramic brake disc with the sandwich structure is characterized in that: the cracking operation of the sandwich structure matrix is as follows: under the protection atmosphere of nitrogen or inert gas, the sandwich structure substrate is carbonized at high temperature of 700 to 1000 ℃ to obtain the sandwich structure substrate with the density of 1.1 to 1.6g/cm 3 The carbonized substrate of (2); and (3) under the protection atmosphere of nitrogen or inert gas, opening the pores of the carbonized matrix at the high temperature of 1800-2500 ℃ to obtain the porous carbonized matrix with the porosity of 15-40%.
3. The carbon/ceramic brake disc with a sandwich structure as claimed in claim 1, wherein: and (2) impregnating the carbon cloth with liquid resin, and drying at 70-80 ℃ to form the carbon pre-impregnated cloth, wherein the carbon cloth is plain woven carbon cloth, and the liquid resin comprises one or more of phenolic resin, epoxy resin, furfuryl ketone resin, cyanate ester resin, furan resin, vinyl resin and benzoxazine resin.
4. The carbon/ceramic brake disc with a sandwich structure as claimed in claim 1, wherein: the chopped carbon fibers consist of two or more chopped carbon fibers with different lengths, the average length is not more than 30mm, and the length difference of the two chopped carbon fibers with the closest lengths is 5-25mm.
5. The carbon/ceramic brake disc with a sandwich structure as claimed in claim 1, wherein: the resin in the short fiber layer comprises one or more of phenolic resin, epoxy resin, furfuryl ketone resin, cyanate resin, furan resin, vinyl resin and benzoxazine resin.
6. A carbon/ceramic brake disc of sandwich construction as claimed in claim 1 wherein: the concrete operation of forming the sandwich structure matrix by mould pressing is as follows: and sequentially filling the carbon cloth composite layer, the short fiber layer and the carbon cloth composite layer into a mold, and then carrying out hot press molding, wherein the hot press temperature is 180 to 220 ℃, the hot press pressure is 28 to 32MPa, and the heat and pressure maintaining time is 45 to 60min, so as to obtain the sandwich structure substrate.
7. The carbon/ceramic brake disc with a sandwich structure as claimed in claim 1, wherein: in the silicon infiltration reaction process, silicon powder with the grain diameter of 20 to 100 mu m is selected, and the infiltration temperature is 1450 to 1800 ℃.
8. A carbon/ceramic brake disc of sandwich structure according to any of claims 1 to 7, wherein: the surface area of the carbon cloth composite layer is gradually reduced along the thickness direction, the reduction proportion is 5 to 20 percent each time, the sizes of the carbon cloth prepreg in every 5 to 20 layers are in the same specification, and the gradient slope formed by the carbon cloth composite layer and the surface with the smallest surface area are in contact with the short fiber layer.
9. A carbon/ceramic brake disc of sandwich construction as claimed in any one of claims 1 to 7 wherein: the connecting holes on the carbon cloth composite layer are regularly or irregularly arranged, the distance between every two adjacent connecting holes is 10 to 100mm, and the sum of the open area of all the connecting holes is 3 to 10 percent of the surface area of the carbon cloth in contact with the short fiber layer.
10. A carbon/ceramic brake disc of sandwich construction as claimed in claim 9 wherein: the connecting holes on the carbon cloth composite layer are in the shape of a circle, an ellipse, a triangle, a quadrangle, a tooth shape, a crescent or other polygons.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116751064A (en) * | 2023-06-13 | 2023-09-15 | 烟台凯泊复合材料科技有限公司 | Preparation method for preparing aircraft carbon/ceramic brake disc by using waste carbon disc |
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