A carbon / carbon composite brake disc and preparation method thereof

Abstract

A carbon / carbon composite brake disc and a preparation method thereof, comprising: a brake disc substrate and a plurality of grooved clips, wherein the outer peripheral wall of the brake disc substrate is evenly provided with a plurality of key grooves, the plurality of grooved clips are respectively fixed in the plurality of key grooves of the brake disc substrate, and the grooved clips are adapted to the key grooves; the brake disc substrate comprises a plurality of carbon fiber cloths, the plurality of carbon fiber cloths are radially arranged, and also comprises carbon fiber wires, the carbon fiber wires circumferentially penetrate the plurality of carbon fiber cloths; the grooved clips comprise 20-40% of the first two-dimensional carbon fiber, 20-40% of the second two-dimensional carbon fiber, 20-40% of the matrix carbon, and 5%-30% of the carbon filler; the density of the first two-dimensional carbon fiber is 1.6-1.8 g / cm 2 , the density of the second two-dimensional carbon fiber is 0.8-1.0g / cm 2 The matrix carbon is generated by carbonization of resin or asphalt. The present invention prolongs the service life of the brake disc by fixing a plurality of groove-shaped clips on the brake disc matrix, improves the high temperature resistance of the brake disc, and prolongs the service life and wear resistance.

Description

Technical Field

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

[0002] Carbon / carbon (C / C) composites are ultra-high temperature composites with excellent ablation resistance, friction resistance, and strong designability. They are widely used in the aerospace field, such as throat liners and expansion sections of rocket engines, and thermal protection materials for advanced aircraft.

[0003] The most mature application of carbon / carbon composite materials in the aerospace field is the brake disc. From the initial limitation to the military field to today's large passenger aircraft and carbon fiber composite sports cars, carbon / carbon composite materials are gradually entering people's daily life. The research and development technology of carbon fiber brake discs is becoming more and more mature. Due to the light specific gravity of carbon / carbon composite materials, using them as brake components can improve the payload and comprehensive performance of aircraft; for large passenger aircraft that operate all year round, reducing the weight will save a lot of costs. In addition, carbon / carbon composite materials have good thermal stability. During the braking process of the aircraft, the maximum temperature of the brake disc has far exceeded the melting point of ordinary metal-based composite materials, resulting in melting adhesion, deformation of the brake disc, etc., which require frequent repairs. Since carbon / carbon composite materials can withstand high temperatures and have stable high-temperature performance, choosing them as brake discs greatly enhances the safety and stability of the brake system. In addition, carbon / carbon composite materials have a relatively stable friction coefficient in a wide temperature range, which makes the aircraft more stable during the entire braking process and improves the comfort of passengers during the flight process. Summary of the invention

[0004] (I) Purpose of the invention

[0005] The purpose of the present invention is to provide a carbon / carbon composite brake disc which is resistant to high temperature and friction and can increase the service life, and a preparation method thereof.

[0006] (II) Technical solution

[0007] In order to solve the above problems, the present invention provides a carbon / carbon composite brake disc, comprising: a brake disc substrate and a plurality of grooved clips, wherein the outer peripheral wall of the brake disc substrate is evenly provided with a plurality of key slots, the plurality of grooved clips are respectively fixed in the plurality of key slots of the brake disc substrate, and the grooved clips are adapted to the key slots;

[0008] The brake disc matrix includes multiple layers of carbon fiber cloth, the multiple layers of carbon fiber cloth are arranged radially, and also includes carbon fiber wires, the carbon fiber wires circumferentially penetrate the multiple layers of carbon fiber cloth;

[0009] The slot-type clip comprises 20-40% of the first two-dimensional carbon fiber, 20-40% of the second two-dimensional carbon fiber, 20-40% of the matrix carbon, and 5%-30% of the carbon filler; the density of the first two-dimensional carbon fiber is 1.6-1.8 g / cm 2 The density of the second two-dimensional carbon fiber is 0.8-1.0 g / cm 2 The matrix carbon is produced by carbonizing resin or pitch.

[0010] In another aspect of the present invention, preferably, a method for preparing a carbon / carbon composite brake disc as described above comprises: preparing a brake disc substrate and preparing a grooved clamp;

[0011] Wherein, the preparation of the slotted clamp comprises:

[0012] The utilization density is 1.6-1.8g / cm 2 The first two-dimensional carbon fiber and the density is 0.8-1.0g / cm 2 The second two-dimensional carbon fiber is woven into a satin cloth to obtain a carbon fiber fabric;

[0013] impregnating the carbon fiber fabric in the mixed solution to obtain a carbon fiber prepreg;

[0014] The carbon fiber prepreg is introduced into a slot-shaped clamp mold for curing and forming to obtain an initial composite material slot-shaped clamp;

[0015] Carrying out a carbonization treatment on the initial composite material slot-shaped clamp under an inert gas atmosphere to obtain an initial carbon / carbon composite material slot-shaped clamp;

[0016] The initial carbon / carbon composite material slot-shaped clamp is placed in an impregnating agent for densification impregnation, so that the impregnating agent enters the pores of the initial carbon / carbon composite material, and then carbonized to obtain a densified carbon / carbon composite material slot-shaped clamp;

[0017] placing the densified carbon / carbon composite material in a slot-shaped sandwich under an inert gas atmosphere for graphitization;

[0018] Machining of graphitized carbon / carbon composite slot clamps;

[0019] A carbon / carbon composite material slot clamp protective coating is prepared for the carbon / carbon composite material slot clamp after mechanical processing.

[0020] In another aspect of the present invention, preferably, the brake disc substrate preparation includes:

[0021] Arranging multiple layers of carbon fiber fabric radially in a brake disc matrix mold, and passing a carbon fiber thread circumferentially through the multiple layers of carbon fiber fabric to obtain a preform of the brake disc matrix;

[0022] Densification impregnation of the preform of the brake disc substrate in an impregnating agent, allowing the impregnating agent to enter the pores of the preform of the brake disc substrate, and then carbonization treatment is performed to obtain a densified brake disc substrate;

[0023] High temperature treatment of the densified brake disc matrix;

[0024] Machining the heat-treated brake disc substrate to final dimensions and keyways;

[0025] Preparation of carbon / carbon composite slot clamp protective coating.

[0026] In another aspect of the present invention, preferably, the mixed solution has a mass ratio of silicon powder: binder: anhydrous ethanol = 5-15:70-85:5-15, and the silicon powder, binder and anhydrous ethanol are uniformly mixed to obtain a mixed solution.

[0027] In another aspect of the present invention, preferably, the densification impregnation of at least one of the groove clamp or the brake disc matrix includes an impregnation time of 5-8h, a vacuum degree of 1-5kPa, and a pressure of 5-20Mpa; the impregnating agent is a thermosetting furan resin or thermoplastic asphalt, or a mixture of a thermosetting furan resin and thermoplastic asphalt.

[0028] In another aspect of the present invention, preferably, the carbonization in the carbonization treatment of the initial composite material groove clamp under an inert gas atmosphere includes carbonization at 600-850° C. under a protective atmosphere for 1-3 hours.

[0029] In another aspect of the present invention, preferably, the carbonization after densification impregnation of at least one of the grooved clip or the brake disc substrate comprises a carbonization temperature of 800-2000° C., a time of 3-6 h, and a pressure of 15-25 MPa under a protective atmosphere.

[0030] In another aspect of the present invention, preferably, the densified carbon / carbon composite material is subjected to graphitization treatment in a protective atmosphere, including a graphitization temperature of 2500-2800°C, a time of 1-2h, and a protective gas is filled at a furnace temperature of 500°C.

[0031] In another aspect of the present invention, preferably, the high temperature treatment of the densified brake disc substrate comprises heat preservation for 1-2 hours at a temperature of 1600-2800°C, and filling with protective gas at a furnace temperature of 400°C.

[0032] In another aspect of the present invention, preferably, preparing a protective coating for at least one of the slot-type clip or the brake disc substrate comprises: dipping in liquid silicon for 5-10 minutes to obtain a slot-type clip or brake disc substrate having a protective coating of silicon; during dipping, controlling the dipping pressure to 0.1-0.2MPa and the temperature to 1500-2000°C.

[0033] (III) Beneficial effects

[0034] The above technical solution of the present invention has the following beneficial technical effects:

[0035] The present invention extends the service life of the brake disc by fixing a plurality of groove clips on a brake disc substrate. The brake disc substrate includes multiple layers of carbon fiber cloth, which are radially arranged, and also includes carbon fiber wires, which circumferentially penetrate the multiple layers of carbon fiber cloth. The service life and wear resistance of the brake disc are improved. The groove clip adopts two-dimensional carbon fibers with two different densities, which improves the high temperature resistance of the brake disc and extends the service life and wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flow chart of a preparation method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0038] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Many specific details of the present invention are described below, such as device structure, materials, dimensions, processing technology and techniques, so as to more clearly understand the present invention. However, as those skilled in the art will appreciate, the present invention may be implemented without following these specific details.

[0041] Embodiment 1

[0042] A carbon / carbon composite brake disc, Figure 1The overall flow chart of the preparation method of the present invention is shown as follows: Figure 1 As shown, it includes: a brake disc base and a plurality of slot-shaped clips, the outer peripheral wall of the brake disc base is evenly provided with a plurality of key slots, the plurality of slot-shaped clips are respectively fixed in the plurality of key slots of the brake disc base, and the slot-shaped clips are adapted to the key slots; the specific size of the brake disc base is not limited here, the number of the brake disc key slots is not limited here, and the specific structure of the slot-shaped clip is not limited here. Optionally, in this embodiment, the structure of the slot-shaped clip can be a U-shaped clip or a structure connected by two U-shaped clips; the specific connection method between the key slot and the slot-shaped clip is not limited here, and optionally, in this embodiment, it can be connected by screws;

[0043] The brake disc matrix includes multiple layers of carbon fiber cloth, the multiple layers of carbon fiber cloth are arranged radially, and also includes carbon fiber wires, the carbon fiber wires circumferentially penetrate the multiple layers of carbon fiber cloth; the specific density of the carbon fiber cloth is not limited here; nor is the rule for the carbon fiber wires to penetrate the carbon fiber cloth limited;

[0044] The slot-type clip comprises 20-40% of the first two-dimensional carbon fiber, 20-40% of the second two-dimensional carbon fiber, 20-40% of the matrix carbon, and 5%-30% of the carbon filler; the density of the first two-dimensional carbon fiber is 1.6-1.8 g / cm 2 The density of the second two-dimensional carbon fiber is 0.8-1.0 g / cm 2 The matrix carbon is produced by carbonizing resin or pitch.

[0045] This embodiment extends the service life of the brake disc by fixing a plurality of groove clips on a brake disc substrate. The brake disc substrate includes multiple layers of carbon fiber cloth, which are radially arranged, and also includes carbon fiber wires, which circumferentially penetrate the multiple layers of carbon fiber cloth. The service life and wear resistance of the brake disc are improved. The groove clip uses two-dimensional carbon fibers with different densities to improve the high temperature resistance of the brake disc and extend the service life and wear resistance.

[0046] Embodiment 2

[0047] A method for preparing a carbon / carbon composite brake disc as described above, comprising: preparing a brake disc substrate and preparing a grooved clamp;

[0048] Wherein, the preparation of the slotted clamp comprises:

[0049] The utilization density is 1.6-1.8g / cm 2 The first two-dimensional carbon fiber and the density is 0.8-1.0g / cm 2 The second two-dimensional carbon fiber is woven into a satin cloth to obtain a carbon fiber fabric;

[0050] The carbon fiber fabric is immersed in the mixed solution to obtain a carbon fiber prepreg; further, in this embodiment, the mixed solution has a mass ratio of silicon powder: binder: anhydrous ethanol = 5-15:70-85:5-15, and the silicon powder, binder, and anhydrous ethanol are evenly mixed to obtain a mixed solution;

[0051] The carbon fiber prepreg is introduced into a slot-shaped clamp mold for curing and forming to obtain an initial composite material slot-shaped clamp;

[0052] The initial composite material slot clamp is subjected to carbonization treatment in an inert gas atmosphere to obtain an initial carbon / carbon composite material slot clamp; further, in this embodiment, the carbonization in the carbonization treatment of the initial composite material slot clamp in an inert gas atmosphere includes carbonization at 600-850° C. under a protective atmosphere for 1-3 hours;

[0053] The initial carbon / carbon composite slot clamp is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the initial carbon / carbon composite material, and then carbonized to obtain a densified carbon / carbon composite slot clamp; further, in this embodiment, the densification impregnation of the slot clamp includes an impregnation time of 5-8h, a vacuum degree of 1-5kPa, and a pressure of 5-20Mpa; the impregnating agent is a thermosetting furan resin or a thermoplastic asphalt, or a mixture of a thermosetting furan resin and a thermoplastic asphalt; further, in this embodiment, the carbonization of the slot clamp after the densification impregnation includes a carbonization temperature of 800-2000°C, a time of 3-6h, and a pressure of 15-25Mpa under a protective atmosphere;

[0054] The densified carbon / carbon composite material slot is clamped in an inert gas atmosphere for graphitization treatment; the densified carbon / carbon composite material slot is clamped in a protective atmosphere for graphitization treatment, including a graphitization treatment temperature of 2500-2800°C, a time of 1-2h, and a protective gas is filled at a furnace temperature of 500°C;

[0055] Machining of graphitized carbon / carbon composite slot clamps;

[0056] A carbon / carbon composite material groove clamp protective coating is prepared for the machined carbon / carbon composite material groove clamp; the groove clamp protective coating preparation comprises: dipping in liquid silicon for 5-10 minutes to obtain a groove clamp or brake disc substrate with a silicon protective coating; during dipping, the dipping pressure is controlled to be 0.1-0.2MPa and the temperature is controlled to be 1500-2000°C;

[0057] Furthermore, the brake disc substrate preparation includes:

[0058] Arranging multiple layers of carbon fiber fabric radially in a brake disc matrix mold, and passing a carbon fiber thread circumferentially through the multiple layers of carbon fiber fabric to obtain a preform of the brake disc matrix;

[0059] The preform of the brake disc substrate is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the preform of the brake disc substrate, and then carbonized to obtain a densified brake disc substrate; further, in this embodiment, the densification impregnation of the brake disc substrate includes an impregnation time of 5-8h, a vacuum degree of 1-5kPa, and a pressure of 5-20Mpa; the impregnating agent is a thermosetting furan resin or a thermoplastic asphalt, or a mixture of a thermosetting furan resin and a thermoplastic asphalt; further, in this embodiment, the carbonization of the brake disc substrate after the densification impregnation includes a carbonization temperature of 800-2000°C, a time of 3-6h, and a pressure of 15-25Mpa under a protective atmosphere;

[0060] The densified brake disc substrate is subjected to high temperature treatment; further, in this embodiment, the densified brake disc substrate is subjected to high temperature treatment including heat preservation for 1-2 hours at a temperature of 1600-2500° C., and protective gas is filled at a furnace temperature of 400° C.;

[0061] Machining the heat-treated brake disc substrate to final dimensions and keyways;

[0062] Prepare a carbon / carbon composite material groove clip protective coating; the preparation of the protective coating of the brake disc substrate includes: immersing it in liquid silicon for 5-10 minutes to obtain a groove clip or brake disc substrate with a protective coating of silicon; during immersion, control the immersion pressure to 0.1-0.2MPa and the temperature to 1500-2000℃.

[0063] In this embodiment, the groove clamp is subjected to two carbonization and graphitization treatments, thereby improving the service life, wear resistance and high temperature resistance; and the service life of the brake disc can be effectively extended.

[0064] Embodiment 3

[0065] A method for preparing a carbon / carbon composite brake disc as described above, comprising: preparing a brake disc substrate and preparing a grooved clamp;

[0066] Wherein, the preparation of the slotted clamp comprises:

[0067] The utilization density is 1.6g / cm 2 The first two-dimensional carbon fiber and the density is 0.8g / cm 2 The second two-dimensional carbon fiber is woven into a satin cloth to obtain a carbon fiber fabric;

[0068] The carbon fiber fabric is immersed in the mixed solution to obtain a carbon fiber prepreg; further, in this embodiment, the mixed solution has a mass ratio of silicon powder: binder: anhydrous ethanol = 15:70:15, and the silicon powder, binder, and anhydrous ethanol are evenly mixed to obtain a mixed solution;

[0069] The carbon fiber prepreg is introduced into a slot-shaped clamp mold for curing and forming to obtain an initial composite material slot-shaped clamp;

[0070] The initial composite material slot clamp is subjected to carbonization treatment in an inert gas atmosphere to obtain an initial carbon / carbon composite material slot clamp; further, in this embodiment, the carbonization in the carbonization treatment of the initial composite material slot clamp in an inert gas atmosphere includes carbonization at 600° C. under a protective atmosphere for 1 hour;

[0071] The initial carbon / carbon composite slot clamp is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the initial carbon / carbon composite material, and then carbonized to obtain a densified carbon / carbon composite slot clamp; further, in this embodiment, the densification impregnation of the slot clamp includes an impregnation time of 5 hours, a vacuum degree of 1 kPa, and a pressure of 5 MPa; the impregnating agent uses a thermosetting furan resin; further, in this embodiment, the carbonization of the slot clamp after the densification impregnation includes a carbonization temperature of 800°C, a time of 3 hours, and a pressure of 15 MPa under a protective atmosphere;

[0072] The densified carbon / carbon composite material slot is clamped in an inert gas atmosphere for graphitization treatment; the densified carbon / carbon composite material slot is clamped in a protective atmosphere for graphitization treatment, including a graphitization treatment temperature of 2500° C., a time of 1 hour, and a protective gas is filled at a furnace temperature of 500° C.;

[0073] Machining of graphitized carbon / carbon composite slot clamps;

[0074] A carbon / carbon composite material groove clamp protective coating is prepared for the machined carbon / carbon composite material groove clamp; the groove clamp protective coating preparation comprises: dipping in liquid silicon for 5 minutes to obtain a groove clamp or brake disc substrate with a silicon protective coating; during dipping, the dipping pressure is controlled to be 0.1 MPa and the temperature is 1500°C;

[0075] Furthermore, the brake disc substrate preparation includes:

[0076] Arranging multiple layers of carbon fiber fabric radially in a brake disc matrix mold, and passing a carbon fiber thread circumferentially through the multiple layers of carbon fiber fabric to obtain a preform of the brake disc matrix;

[0077] The preform of the brake disc substrate is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the preform of the brake disc substrate, and then carbonized to obtain a densified brake disc substrate; further, in this embodiment, the densification impregnation of the brake disc substrate includes an impregnation time of 5 hours, a vacuum degree of 1 kPa, and a pressure of 5 MPa; the impregnating agent is a thermosetting furan resin or a thermoplastic asphalt, or a mixture of a thermosetting furan resin and a thermoplastic asphalt; further, in this embodiment, the carbonization of the brake disc substrate after the densification impregnation includes a carbonization temperature of 800°C, a time of 3 hours, and a pressure of 15 MPa under a protective atmosphere;

[0078] The densified brake disc substrate is subjected to high temperature treatment; further, in this embodiment, the densified brake disc substrate is subjected to high temperature treatment including heat preservation for 1 hour at a temperature of 1600° C., and a protective gas is filled at a furnace temperature of 400° C.;

[0079] Machining the heat-treated brake disc substrate to final dimensions and keyways;

[0080] Prepare a carbon / carbon composite material groove clip protective coating; the preparation of the protective coating of the brake disc substrate includes: immersing it in liquid silicon for 5 minutes to obtain a groove clip or brake disc substrate with a protective coating of silicon; during immersion, control the immersion pressure to 0.1MPa and the temperature to 1500℃.

[0081] In this embodiment, the service life of the brake disc is increased by 11.3%, the wear resistance is increased by 13%, and the high temperature resistance is increased by 8.1%.

[0082] Embodiment 4

[0083] A method for preparing a carbon / carbon composite brake disc as described above, comprising: preparing a brake disc substrate and preparing a grooved clamp;

[0084] Wherein, the preparation of the slotted clamp comprises:

[0085] The utilization density is 1.8g / cm 2 The first two-dimensional carbon fiber has a density of 1.0 g / cm 2 The second two-dimensional carbon fiber is woven into a satin cloth to obtain a carbon fiber fabric;

[0086] The carbon fiber fabric is immersed in the mixed solution to obtain a carbon fiber prepreg; further, in this embodiment, the mixed solution has a mass ratio of silicon powder: binder: anhydrous ethanol = 5:85:10, and the silicon powder, binder, and anhydrous ethanol are evenly mixed to obtain a mixed solution;

[0087] The carbon fiber prepreg is introduced into a slot-shaped clamp mold for curing and forming to obtain an initial composite material slot-shaped clamp;

[0088] The initial composite material slot clamp is subjected to carbonization treatment in an inert gas atmosphere to obtain an initial carbon / carbon composite material slot clamp; further, in this embodiment, the carbonization in the carbonization treatment of the initial composite material slot clamp in an inert gas atmosphere includes carbonization at 850° C. under a protective atmosphere for 3 hours;

[0089] The initial carbon / carbon composite slot clamp is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the initial carbon / carbon composite material, and then carbonized to obtain a densified carbon / carbon composite slot clamp; further, in this embodiment, the densification impregnation of the slot clamp includes an impregnation time of 8 hours, a vacuum degree of 5 kPa, and a pressure of 20 MPa; the impregnating agent is a thermosetting furan resin or a thermoplastic asphalt, or a mixture of a thermosetting furan resin and a thermoplastic asphalt; further, in this embodiment, the carbonization of the slot clamp after the densification impregnation includes a carbonization temperature of 2000°C, a time of 6 hours, and a pressure of 25 MPa under a protective atmosphere;

[0090] The densified carbon / carbon composite material slot is clamped in an inert gas atmosphere for graphitization treatment; the densified carbon / carbon composite material slot is clamped in a protective atmosphere for graphitization treatment, including a graphitization treatment temperature of 2800° C., a time of 2 hours, and a protective gas is filled at a furnace temperature of 500° C.;

[0091] Machining of graphitized carbon / carbon composite slot clamps;

[0092] A carbon / carbon composite material groove clamp protective coating is prepared for the machined carbon / carbon composite material groove clamp; the groove clamp protective coating preparation comprises: dipping in liquid silicon for 10 minutes to obtain a groove clamp or brake disc substrate with a silicon protective coating; during dipping, the dipping pressure is controlled to be 0.2MPa and the temperature is controlled to be 2000°C;

[0093] Furthermore, the brake disc substrate preparation includes:

[0094] Arranging multiple layers of carbon fiber fabric radially in a brake disc matrix mold, and passing a carbon fiber thread circumferentially through the multiple layers of carbon fiber fabric to obtain a preform of the brake disc matrix;

[0095] The preform of the brake disc substrate is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the preform of the brake disc substrate, and then carbonized to obtain a densified brake disc substrate; further, in this embodiment, the densification impregnation of the brake disc substrate includes an impregnation time of 8 hours, a vacuum degree of 5 kPa, and a pressure of 20 MPa; the impregnating agent is a thermosetting furan resin or a thermoplastic asphalt, or a mixture of a thermosetting furan resin and a thermoplastic asphalt; further, in this embodiment, the carbonization of the brake disc substrate after the densification impregnation includes a carbonization temperature of 2000°C, a time of 6 hours, and a pressure of 25 MPa under a protective atmosphere;

[0096] The densified brake disc substrate is subjected to high temperature treatment; further, in this embodiment, the densified brake disc substrate is subjected to high temperature treatment including heat preservation for 2 hours at a temperature of 2800° C., and protective gas is filled at a furnace temperature of 400° C.;

[0097] Machining the heat-treated brake disc substrate to final dimensions and keyways;

[0098] Prepare a carbon / carbon composite material groove clip protective coating; the preparation of the protective coating of the brake disc substrate includes: immersing it in liquid silicon for 10 minutes to obtain a groove clip or brake disc substrate with a protective coating of silicon; during immersion, control the immersion pressure to 0.2MPa and the temperature to 2000℃.

[0099] In this embodiment, the service life of the brake disc is increased by 10.7%, the high temperature resistance is increased by 11.4%, and the wear resistance is increased by 11.1%.

[0100] Embodiment 5

[0101] A method for preparing a carbon / carbon composite brake disc as described above, comprising: preparing a brake disc substrate and preparing a grooved clamp;

[0102] Wherein, the preparation of the slotted clamp comprises:

[0103] The utilization density is 1.7g / cm 2 The first two-dimensional carbon fiber and the density is 0.9g / cm 2 The second two-dimensional carbon fiber is woven into a satin cloth to obtain a carbon fiber fabric;

[0104] The carbon fiber fabric is immersed in the mixed solution to obtain a carbon fiber prepreg; further, in this embodiment, the mixed solution has a mass ratio of silicon powder: binder: anhydrous ethanol = 10:80:10, and the silicon powder, binder, and anhydrous ethanol are evenly mixed to obtain a mixed solution;

[0105] The carbon fiber prepreg is introduced into a slot-shaped clamp mold for curing and forming to obtain an initial composite material slot-shaped clamp;

[0106] The initial composite material slot clamp is subjected to carbonization treatment in an inert gas atmosphere to obtain an initial carbon / carbon composite material slot clamp; further, in this embodiment, the carbonization in the carbonization treatment of the initial composite material slot clamp in an inert gas atmosphere includes carbonization at 720° C. under a protective atmosphere for 2.5 hours;

[0107] The initial carbon / carbon composite slot clamp is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the initial carbon / carbon composite material, and then carbonized to obtain a densified carbon / carbon composite slot clamp; further, in this embodiment, the densification impregnation of the slot clamp includes an impregnation time of 6.4 hours, a vacuum degree of 3.2 kPa, and a pressure of 11.5 MPa; the impregnating agent is a thermosetting furan resin or a thermoplastic asphalt, or a mixture of a thermosetting furan resin and a thermoplastic asphalt; further, in this embodiment, the carbonization of the slot clamp after the densification impregnation includes a carbonization temperature of 1400°C, a time of 4.5 hours, and a pressure of 20 MPa under a protective atmosphere;

[0108] The densified carbon / carbon composite material slot is clamped in an inert gas atmosphere for graphitization treatment; the densified carbon / carbon composite material slot is clamped in a protective atmosphere for graphitization treatment, including a graphitization treatment temperature of 2700° C., a time of 1.5 hours, and a protective gas is filled at a furnace temperature of 500° C.;

[0109] Machining of graphitized carbon / carbon composite slot clamps;

[0110] A carbon / carbon composite material groove clamp protective coating is prepared for the machined carbon / carbon composite material groove clamp; the groove clamp protective coating preparation comprises: dipping in liquid silicon for 7 minutes to obtain a groove clamp or brake disc substrate with a silicon protective coating; during dipping, the dipping pressure is controlled to be 0.15MPa and the temperature is controlled to be 1700°C;

[0111] Furthermore, the brake disc substrate preparation includes:

[0112] Arranging multiple layers of carbon fiber fabric radially in a brake disc matrix mold, and passing a carbon fiber thread circumferentially through the multiple layers of carbon fiber fabric to obtain a preform of the brake disc matrix;

[0113] The preform of the brake disc substrate is impregnated with an impregnating agent for densification, so that the impregnating agent enters the pores of the preform of the brake disc substrate, and then carbonized to obtain a densified brake disc substrate; further, in this embodiment, the densification impregnation of the brake disc substrate includes an impregnation time of 6.2 hours, a vacuum degree of 3kPa, and a pressure of 13Mpa; the impregnating agent is a thermosetting furan resin or a thermoplastic asphalt, or a mixture of a thermosetting furan resin and a thermoplastic asphalt; further, in this embodiment, the carbonization of the brake disc substrate after the densification impregnation includes a carbonization temperature of 1300°C, a time of 5 hours, and a pressure of 20Mpa under a protective atmosphere;

[0114] The densified brake disc substrate is subjected to high temperature treatment; further, in this embodiment, the densified brake disc substrate is subjected to high temperature treatment including heat preservation for 1.8 hours at a temperature of 2200° C., and a protective gas is filled at a furnace temperature of 400° C.;

[0115] Machining the heat-treated brake disc substrate to final dimensions and keyways;

[0116] Prepare a carbon / carbon composite groove clip protective coating; the preparation of the protective coating of the brake disc substrate includes: immersing it in liquid silicon for 7 minutes to obtain a groove clip or brake disc substrate with a protective coating of silicon; during immersion, control the immersion pressure to 0.15MPa and the temperature to 1800℃.

[0117] In this embodiment, the service life of the brake disc is increased by 12.1%, the high temperature resistance is increased by 11.2%, and the wear resistance is increased by 11.7%.

[0118] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

[0119] In the above description, the technical details of patterning and etching of each layer are not described in detail. However, those skilled in the art should understand that various means in the prior art can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above.

[0120] The present invention has been described above with reference to the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

[0121] Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.

Claims

1. A method for preparing a carbon / carbon composite brake disc, characterized in that: The carbon / carbon composite brake disc comprises: a brake disc substrate and a plurality of grooved clips, wherein a plurality of key slots are evenly arranged on the outer peripheral wall of the brake disc substrate, and the plurality of grooved clips are respectively fixed in the plurality of key slots of the brake disc substrate, and the grooved clips are adapted to the key slots; The brake disc matrix includes multiple layers of carbon fiber cloth, the multiple layers of carbon fiber cloth are arranged radially, and also includes carbon fiber wires, the carbon fiber wires circumferentially penetrate the multiple layers of carbon fiber cloth; The slot clip comprises 20-40% of the first two-dimensional carbon fiber, 20-40% of the second two-dimensional carbon fiber, 20-40% of the matrix carbon, and 5%-30% of the carbon filler; the density of the first two-dimensional carbon fiber is 1.6-1.8g / cm 2 The density of the second two-dimensional carbon fiber is 0.8-1.0 g / cm 2 , the matrix carbon is produced by carbonizing resin or pitch; The method comprises: preparing a brake disc substrate and a groove clamp; Wherein, the preparation of the slotted clamp comprises: The utilization density is 1.6-1.8g / cm 2 The first two-dimensional carbon fiber and the density is 0.8-1.0g / cm 2 The second two-dimensional carbon fiber is woven into a satin cloth to obtain a carbon fiber fabric; impregnating the carbon fiber fabric in the mixed solution to obtain a carbon fiber prepreg; The carbon fiber prepreg is introduced into a slot-shaped clamp mold for curing and forming to obtain an initial composite material slot-shaped clamp; Carrying out a carbonization treatment on the initial composite material slot-shaped clamp under an inert gas atmosphere to obtain an initial carbon / carbon composite material slot-shaped clamp; The initial carbon / carbon composite material slot-shaped clamp is placed in an impregnating agent for densification impregnation, so that the impregnating agent enters the pores of the initial carbon / carbon composite material, and then carbonized to obtain a densified carbon / carbon composite material slot-shaped clamp; placing the densified carbon / carbon composite material in a slot-shaped sandwich under an inert gas atmosphere for graphitization; Machining of graphitized carbon / carbon composite slot clamps; Preparing a carbon / carbon composite material slot-shaped clamp protective coating for the carbon / carbon composite material slot-shaped clamp after mechanical processing; The mixed solution has a mass ratio of silicon powder: binder: anhydrous ethanol = 5-15:70-85:5-15. The silicon powder, binder and anhydrous ethanol are evenly mixed to obtain a mixed solution.

2. The method for preparing a carbon / carbon composite brake disc according to claim 1, characterized in that: The brake disc substrate preparation comprises: Arranging multiple layers of carbon fiber fabric radially in a brake disc matrix mold, and passing a carbon fiber thread circumferentially through the multiple layers of carbon fiber fabric to obtain a preform of the brake disc matrix; Densification impregnation of the preform of the brake disc substrate in an impregnating agent, allowing the impregnating agent to enter the pores of the preform of the brake disc substrate, and then carbonization treatment is performed to obtain a densified brake disc substrate; High temperature treatment of the densified brake disc matrix; Machining the heat-treated brake disc substrate to final dimensions and keyways; Preparation of carbon / carbon composite slot clamp protective coating.

3. The method for preparing a carbon / carbon composite brake disc according to claim 2, characterized in that: The densification impregnation of at least one of the groove clamp or the brake disc matrix includes an impregnation time of 5-8 hours, a vacuum degree of 1-5 kPa, and a pressure of 5-20 MPa; the impregnating agent is thermosetting furan resin or thermoplastic asphalt, or a mixture of thermosetting furan resin and thermoplastic asphalt.

4. The method for preparing a carbon / carbon composite brake disc according to claim 2, characterized in that: The carbonization treatment of the initial composite material groove clamp in an inert gas atmosphere includes carbonization at 600-850° C. in a protective atmosphere for 1-3 hours.

5. The method for preparing a carbon / carbon composite brake disc according to claim 2, characterized in that: The carbonization after densification impregnation of at least one of the slotted clip or the brake disc substrate includes a carbonization temperature of 800-2000° C., a time of 3-6 hours, and a pressure of 15-25 MPa under a protective atmosphere.

6. The method for preparing a carbon / carbon composite brake disc according to claim 1, characterized in that: The densified carbon / carbon composite material slot is clamped in a protective atmosphere for graphitization treatment, including a graphitization treatment temperature of 2500-2800° C., a time of 1-2 hours, and a protective gas is filled at a furnace temperature of 500° C.

7. The method for preparing a carbon / carbon composite brake disc according to claim 2, characterized in that: The high temperature treatment of the densified brake disc substrate includes heat preservation for 1-2 hours at a temperature of 1600-2800°C and filling with protective gas at a furnace temperature of 400°C.

8. The method for preparing a carbon / carbon composite brake disc according to claim 2, characterized in that: The preparation of protective coating for at least one of the grooved clip or the brake disc substrate comprises: dipping in liquid silicon for 5-10 minutes to obtain a grooved clip or brake disc substrate with protective coating of silicon; during dipping, controlling the dipping pressure to 0.1-0.2MPa and the temperature to 1500-2000°C.

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