Carbon-ceramic brake disc and preparation method thereof

Abstract

The application discloses a kind of carbon ceramic brake pad for grinding carbon ceramic brake disc, belong to brake pad technical field, solve the poor heat dissipation performance of existing ceramic brake pad, insufficient connection strength, leading to the problem of poor friction performance, it includes carbon ceramic lining plate and the carbon ceramic friction surface installed on carbon ceramic lining plate, multiple mortise grooves are set on the upper surface of carbon ceramic lining plate, multiple tenon heads matched with mortise groove are set on the lower surface of carbon ceramic friction surface, tenon head is embedded into mortise groove and forms mortise and tenon structure, connects carbon ceramic lining plate and carbon ceramic friction surface, ear plate is set on the circumference of carbon ceramic lining plate, and mounting hole is formed in ear plate;In the application, the friction coefficient is adjusted by designing ceramic phase composition and density of carbon ceramic friction surface and carbon ceramic lining plate, and carbon ceramic lining plate and carbon ceramic friction surface are connected by RMI process and mortise and tenon structure to improve the mechanical properties of connecting place, ensure braking safety, reduce thermal stress generated in braking process, so as to improve the friction performance, effectively guarantee braking effect, and prolong service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake pads, in particular to a carbon-ceramic brake pad for a carbon-ceramic brake disc and a preparation method thereof. BACKGROUND

[0002] The brake pad is a commonly used safety part in mechanical systems, and its working mode is mainly through friction to brake. With the development of science and technology, carbon fiber ceramic brake pads gradually replace traditional metal brake pads and organic brake pads, and the carbon fiber ceramic brake pad has the advantages of high stability, wear resistance, heat insulation and the like.

[0003] However, the existing ceramic brake pad has the following problems in use: first, the existing ceramic brake pad is bonded by a resin or the like, which has high requirements for the adhesive, increases the cost, and also limits the stability of the bonded brake pad; second, the existing brake pad has poor heat dissipation performance, and even the carbon fiber ceramic brake pad with high stability will be affected under high temperature for a long time, such as reducing the friction coefficient and shortening the service life; third, the existing brake pad is inconvenient to replace, and cannot be processed in time in case of an emergency.

[0004] The carbon-ceramic brake material has excellent friction and wear performance (high and stable friction coefficient and small wear), low density, high strength, large braking ratio, high temperature resistance and a series of advantages, which can greatly improve the brake efficiency and service life while ensuring the safety of high-speed and high-power brakes of power machinery.

[0005] The carbon-ceramic brake pad is based on C / C composite material, and a proper amount of SiC ceramic is introduced into the matrix, which effectively improves the friction coefficient and oxidation resistance of the material, and significantly reduces the sensitivity of the friction performance to external conditions (temperature and humidity). Under the conditions of sudden braking, high temperature and rain and snow, the brake performance will not decline, and strong guarantee can be provided for parking safety. At the same time, due to the low thermal expansion rate, high thermal conductivity and medium modulus, the carbon-ceramic brake pad has excellent thermal stability, and its strength can remain at a normal level as the temperature rises, or even better than the room temperature strength. SUMMARY

[0006] In view of the above problems in the prior art, the present application provides a carbon-ceramic brake pad for a carbon-ceramic brake disc and a preparation method thereof, which solves the problems of poor heat dissipation performance, insufficient connection strength and poor friction performance of the existing ceramic brake pad.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] In one aspect, a carbon-ceramic brake pad for a carbon-ceramic brake disc is provided, which comprises a carbon-ceramic backing plate and a carbon-ceramic friction surface mounted on the carbon-ceramic backing plate, the carbon-ceramic backing plate being a two-dimensional laminated preform, and the carbon-ceramic friction surface being a three-dimensional needle-punched preform, a plurality of mortises are formed on the upper surface of the carbon-ceramic backing plate, and a plurality of tenons matching the mortises are arranged on the lower surface of the carbon-ceramic friction surface, the tenons are embedded in the mortises to form a mortise-and-tenon structure, connecting the carbon-ceramic backing plate and the carbon-ceramic friction surface, and a plurality of ear plates are arranged circumferentially on the carbon-ceramic backing plate, and a plurality of mounting holes are formed on the ear plates.

[0009] In the present application, the carbon-ceramic friction surface is a three-dimensional needle-punched preform, and the carbon-ceramic backing plate is a two-dimensional laminated preform, the friction coefficient is adjusted by designing the ceramic phase composition and density, and the mechanical properties of the connection between the carbon-ceramic backing plate and the carbon-ceramic friction surface are improved by the RMI process and the mortise-and-tenon structure to ensure braking safety, reduce thermal stress generated during braking, avoid stress concentration, thereby improving the friction performance, effectively ensuring the braking effect, and prolonging the service life.

[0010] Further, a plurality of scribe grooves are formed on the upper surface of the carbon-ceramic friction surface.

[0011] In the present application, scribe grooves are formed on the carbon-ceramic friction surface, and the above-mentioned scheme can effectively speed up the outflow of brake pad friction gas, facilitate heat dissipation of the brake pad, greatly improve the braking effect, and can also remove debris generated during braking, making the brake noise smaller and greatly reducing vibration and resonance.

[0012] Further, the number of scribe grooves is 1-4, and the scribe grooves are symmetrically distributed along the central axis of the carbon-ceramic friction surface.

[0013] Further, the width L1 of the scribe groove is 1-5 mm, and the depth H1 of the scribe groove is 1-5 mm.

[0014] Further, the angle θ of the tenon is 75-90°, the number of mortises is 1-4, the depth H4 of the mortise is 3-8 mm, and the width L2 of the mortise at the closing end is 15-50 mm.

[0015] Further, a heat-resistant adhesive layer is arranged between the carbon-ceramic backing plate and the carbon-ceramic friction surface.

[0016] In the present application, the connection between the carbon-ceramic backing plate and the carbon-ceramic friction surface is further improved by the heat-resistant adhesive layer, and the excellent high-temperature resistance of the heat-resistant adhesive layer reduces the influence of high temperature generated during braking on the caliper and the oil circuit system.

[0017] Further, the heat-resistant adhesive layer is an inorganic high-temperature adhesive, wherein the amount of resin is 80-120 parts, the amount of curing agent is 30-80 parts, and the amount of filler is 70-120 parts.

[0018] Further, the carbon ceramic friction surface is prepared by the following method:

[0019] Step S1, a continuous fiber toughened ceramic matrix composite material with a density of 1.8-2.5 g / cm 3 is densified at 600-1200℃ by chemical vapor infiltration to prepare a C / C blank with a density of 0.8-1.0 g / cm 3 ;

[0020] Step S2, the C / C blank is graphitized at 2100-2800℃ under vacuum for 1-6h;

[0021] Step S3, the C / C blank obtained in step S2 is modified by precursor impregnation method, wherein the modifier is a mixture of impregnated resin, curing agent, solvent and modified powder, the mixture is pressurized and impregnated at 0.5-1.5MPa, the impregnation time is 1-3h, and after impregnation, the resin is cured at different temperatures according to the type of curing agent selected;

[0022] Step S4, the blank obtained in step S3 is sintered at 800-1100℃ under vacuum for 1-4h;

[0023] Step S5, repeat steps 3 and 4 until the density of the blank is 1.2-1.5g / cm3

[0024] Step S6, the blank obtained in step S5 is rough machined, including cutting according to the design size, processing the contour, processing the scribe groove and the tenon.

[0025] Further, the carbon ceramic liner plate is prepared by the following method:

[0026] Step A1, prepare a ceramic slurry, which is a mixture of resin, curing agent, solvent and modified powder;

[0027] Step A2, impregnate the carbon fiber cloth in the ceramic slurry, and after drying, stack it, and finally use 12K or 24K large tow carbon fiber to make a through seam;

[0028] Step A3, curing on a hot press, different temperature settings are made according to the type of curing agent selected, the pressure is 1-5MPa, to obtain a C / C blank;

[0029] Step A4, sinter the C / C blank at 800-1100℃ under vacuum for 1-4h, and sinter to a density of 1.2-1.5g / cm 3 ;

[0030] Step A5, rough machining is performed on the C / C blank, including cutting according to the design size, machining a contour, machining mounting holes and mortise and tenon joints.

[0031] In another aspect, a preparation method for a carbon-ceramic brake pad for a carbon-ceramic brake disc is provided, comprising the following steps:

[0032] Step B1, the carbon-ceramic friction surface and the carbon-ceramic backing plate are pre-connected through a mortise and tenon joint formed by embedding the tenon into the mortise.

[0033] Step B2, the pre-connected carbon-ceramic friction surface and the carbon-ceramic backing plate are placed in a vacuum condition at 1500 DEG C, and a ceramic reaction is performed through a reaction melt infiltration method, and the reaction time is 2h.

[0034] Step B3, the carbon-ceramic brake pad after the ceramic reaction is super-finished.

[0035] The application discloses a carbon-ceramic brake pad for a carbon-ceramic brake disc and a preparation method thereof, and has the following beneficial effects:

[0036] 1. In the application, the carbon-ceramic friction surface is a three-dimensional needling preform, the friction coefficient is adjusted by designing the ceramic phase composition and density, the carbon-ceramic backing plate is a two-dimensional laminated preform, the whole surface is continuous fibers to improve the mechanical properties of the connection part, ensure the braking safety, reduce the thermal stress generated in the braking process, and the carbon-ceramic backing plate and the carbon-ceramic friction surface are connected in a split type, the carbon-ceramic backing plate and the carbon-ceramic friction surface are connected through an RMI process and a mortise and tenon joint, convenient to install, not easy to fall off after installation, and stress concentration is avoided, thereby improving the friction performance, effectively ensuring the braking effect, and prolonging the service life.

[0037] 2. The application is provided with a scribe groove on the carbon-ceramic friction surface, which can effectively accelerate the speed of the brake pad friction gas outflow, is beneficial to brake pad heat dissipation, greatly improves the braking effect, and can remove the debris generated by the disc / pad wear during braking, so that the brake noise is smaller, and the vibration and resonance are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a structure schematic view of the carbon-ceramic brake pad for the carbon-ceramic brake disc.

[0039] Figure 2 It is a sectional view of A-A in the application. Figure 1

[0040] Figure 3 It is a structure schematic view of the carbon-ceramic friction surface.

[0041] Figure 4 It is a structure schematic view of the carbon-ceramic backing plate. ​

[0042] 1, carbon ceramic lining plate; 2, carbon ceramic friction surface; 3, scribe groove; 4, tenon; 5, lug plate; 6, mortise; 7, heat-resistant adhesive layer; 8, mounting hole. DETAILED DESCRIPTION

[0043] The specific embodiments of the present application are described in order to facilitate the understanding of the present application for those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all the inventions utilizing the concept of the present application are within the scope of protection.

[0044] Example 1

[0045] Reference Figures 1-4 A structure diagram of a carbon ceramic brake pad for a carbon ceramic brake disc is provided for this embodiment, which aims to solve the problems of poor heat dissipation performance, insufficient connection strength and poor friction performance of existing ceramic brake pads. The specific structure in this embodiment will be described in detail below.

[0046] A carbon ceramic brake pad for a carbon ceramic brake disc includes a carbon ceramic lining plate 1 and a carbon ceramic friction surface 2 mounted on the carbon ceramic lining plate 1.

[0047] Specifically, the carbon ceramic lining plate 1 is a two-dimensional laminated preform, and the carbon ceramic friction surface 2 is a three-dimensional needled preform. A plurality of mortises 6 are formed on the upper surface of the carbon ceramic lining plate 1, and a plurality of tenons 4 matching the mortises 6 are arranged on the lower surface of the carbon ceramic friction surface 2. The tenons 4 are embedded in the mortises 6 to form a mortise-and-tenon structure, connecting the carbon ceramic lining plate 1 and the carbon ceramic friction surface 2.

[0048] In this embodiment, the carbon ceramic friction surface 2 is a three-dimensional needled preform, and the friction coefficient is adjusted by designing the ceramic phase composition and density. The carbon ceramic lining plate 1 is a two-dimensional laminated preform, and the entire surface is a continuous fiber to improve the mechanical properties of the connection and ensure the safety of braking, reduce the thermal stress generated during braking, and the carbon ceramic lining plate 1 and the carbon ceramic friction surface 2 are connected in a split type, which is connected by RMI process and mortise-and-tenon structure. The carbon ceramic lining plate 1 and the carbon ceramic friction surface 2 are convenient to install and not easy to fall off after installation, and stress concentration is avoided, thereby improving the friction performance, effectively ensuring the braking effect, and prolonging the service life.

[0049] The carbon ceramic lining plate 1 is provided with a lug plate 5 around the circumference, and a mounting hole 8 is formed in the lug plate 5. The carbon ceramic brake pad is mounted on the carbon ceramic brake disc through the mounting hole 8.

[0050] Specifically, a plurality of scribe grooves 3 are formed on the upper surface of the carbon ceramic friction surface 2, the number of scribe grooves 3 is 1-4, and the scribe grooves 3 are symmetrically distributed along the central axis of the carbon ceramic friction surface 2.

[0051] In the embodiment, the number of the scribe grooves 3 is two, and the two scribe grooves 3 are symmetrically distributed along the central axis of the carbon-ceramic friction surface 2. On the one hand, the scribe grooves 3 can effectively accelerate the speed of the outflow of the brake pad friction gas, facilitate the heat dissipation of the brake pad, and greatly improve the braking effect. On the other hand, the scribe grooves 3 can remove the debris generated by the wear of the disc / plate during braking, so that the brake noise is smaller, and the vibration and resonance are greatly reduced.

[0052] The scribe grooves 3 can be provided with metal gaskets, which can be used as friction limiting marks to ensure the timely replacement of the brake pad.

[0053] The width L1 of the scribe groove 3 is 1mm-5mm, and the depth H1 of the scribe groove 3 is 1mm-5mm.

[0054] In the embodiment, the shape of the scribe groove 3 can be a symmetric straight line or curve such as "I" type, "V" type, "W" type, "X" type, "Y" type, and "H" type. In the embodiment, the shape of the scribe groove 3 is "I" type, the width L1 is 3mm, the depth H1 is 3mm, the scribe groove 3 is 65mm away from the edge of the carbon-ceramic friction surface 2, and the distance between the two scribe grooves 3 is 60mm.

[0055] Specifically, the angle θ at the tenon 4 is 75°-90°, the number of the mortise 6 is 1-4, the depth H4 of the mortise 6 is 3mm-8mm, and the width L2 of the mortise 6 at the closing part is 15mm-50mm.

[0056] In the embodiment, the tenon 4 is embedded in the mortise 6 to form a mortise and tenon structure, which can connect the carbon-ceramic lining plate 1 and the carbon-ceramic friction surface 2. This structure is convenient to install and not easy to fall off after installation, and can avoid stress concentration. Compared with a straight column-shaped connection, the mortise and tenon structure is more solid and reliable.

[0057] In the embodiment, the number of the tenon 4 and the mortise 6 is two, the angle θ at the tenon 4 is 85°, the depth H4 of the mortise 6 is 6mm, the width L2 of the mortise 6 at the closing part is 20mm, the distance between the two mortises 6 is 45mm, and the distance between the two mortises 6 and the edge of the carbon-ceramic friction surface 2 is 60mm.

[0058] Specifically, the carbon-ceramic lining plate 1 and the carbon-ceramic friction surface 2 are provided with a heat-resistant adhesive layer 7.

[0059] In the embodiment, the heat-resistant adhesive layer 7 can further improve the connection between the carbon-ceramic lining plate 1 and the carbon-ceramic friction surface 2. The heat-resistant adhesive layer 7 has excellent high-temperature resistance, which can reduce the influence of high temperature generated during braking on the caliper and the oil circuit system.

[0060] The heat-resistant adhesive layer 7 is inorganic high-temperature glue, wherein the resin is used in an amount of 80-120 parts, the curing agent is used in an amount of 30-80 parts, and the filler is used in an amount of 70-120 parts.

[0061] In this embodiment, the inorganic high-temperature glue can be phosphate, silicate, sodium silicate, etc. In this embodiment, the inorganic high-temperature glue is sodium silicate, wherein the resin is used in an amount of 100 parts, the curing agent is used in an amount of 40 parts, and the filler is used in an amount of 110 parts.

[0062] Embodiment 2

[0063] A carbon-ceramic brake pad for a carbon-ceramic brake disc, and a preparation method thereof, the preparation method comprising the following steps:

[0064] (1) Preparation of a carbon-ceramic friction surface

[0065] (1.1) Densifying a continuous fiber-reinforced ceramic matrix composite material with a density of 2.5 g / cm 3 at 1200°C by chemical vapor infiltration to prepare a C / C blank with a density of 1.0 g / cm 3 ;

[0066] Further, the carbon source gas in the chemical vapor infiltration is propylene, petroleum liquefied gas or natural gas, and the carrier gas is hydrogen, nitrogen or argon.

[0067] In this embodiment, the carbon source gas in the chemical vapor infiltration is propylene, and the carrier gas is hydrogen.

[0068] (1.2) Graphitizing the C / C blank at 2800°C under vacuum for 6h;

[0069] (1.3) The modifier is a mixture of impregnated resin, curing agent, solvent and modified powder, the mixture is subjected to pressure impregnation at 1.5 MPa, the impregnation time is 3h, and after impregnation, the resin is cured at different temperatures according to the type of curing agent selected;

[0070] Further, the impregnated resin is high-residue phenolic resin or epoxy resin, the curing agent is selected from amine and acid anhydride such as urotropine, polyamide, m-phenylenediamine and maleic anhydride, the solvent is ethanol or acetone, and the modified powder is silicon carbide powder, zirconium carbide powder, etc.

[0071] In this embodiment, the impregnated resin is high-residue phenolic resin, the curing agent is urotropine, the solvent is ethanol, and the ceramic powder used as the modified powder is silicon carbide powder; the specific proportion of the mixture is that the impregnated resin, the curing agent, the solvent and the modified powder are prepared in a mass ratio of 100:10:100:50, and the curing temperature condition is 200°C / 3h.

[0072] (1.4), sintering the blank obtained in step S3 under vacuum condition at 1100℃ for 4h;

[0073] (1.5), repeating step 3 and step 4 until the density of the blank is 1.5g / cm3

[0074] (1.6), rough processing the blank obtained in step S5, including cutting according to the design size, processing the contour, processing the scribe groove 3 and the tenon 4.

[0075] (2) Preparation of carbon ceramic lining plate

[0076] (2.1), preparing ceramic slurry, the ceramic slurry being a mixture of resin, curing agent, solvent and modified powder;

[0077] Further, the resin is selected from high carbon residue phenolic resin or epoxy resin, the curing agent is selected from urotropin, polyamide, m-phenylenediamine, maleic anhydride and the like amine and acid anhydride, the solvent is ethanol or acetone, and the modified powder is ceramic powder such as silicon carbide powder and zirconium carbide powder;

[0078] In this embodiment, the resin is high carbon residue phenolic resin, the curing agent is urotropin, the solvent is ethanol, and the ceramic powder used as the modified powder is silicon carbide powder; the specific proportion of the mixture is resin, curing agent, solvent and modified powder, and the mass ratio is 100:10:100:50.

[0079] (2.2), impregnating the carbon fiber cloth in the ceramic slurry, and then laminating after drying, and finally using 12K or 24K large-tow carbon fiber to make a through seam;

[0080] (2.3), curing on a hot press, different temperature settings are made according to the different types of curing agent selected, and the pressure is 5MPa, to obtain a C / C blank;

[0081] In this embodiment, the curing agent selected is urotropin, and the curing temperature condition is 200℃ / 3h.

[0082] (2.4), sintering the C / C blank under vacuum condition at 1100℃ for 4h, and sintering to a density of 1.5g / cm 3 ;

[0083] (2.5), rough processing the C / C blank, including cutting according to the design size, processing the contour, processing the mounting hole 8 and the tenon groove 6.

[0084] (3) Preparation of carbon ceramic brake pad

[0085] (3.1), pre-connecting the carbon ceramic friction surface 2 and the carbon ceramic lining plate 1 through the mortise and tenon structure composed of the tenon 4 embedded in the tenon groove 6;

[0086] (3.2), the pre-connected carbon ceramic friction surface 2 and carbon ceramic lining plate 1 are placed in a vacuum condition of 1500℃, and a ceramic reaction is performed by using a reaction melt infiltration method, and the reaction time is 2h;

[0087] Further, the reaction precursor in the ceramic reaction is a mixture of silicon powder and iron-silicon powder, and the specific proportion of the mixture is that the silicon powder and the iron-silicon powder are prepared according to the mass ratio of 100:100;

[0088] (3.3), the carbon ceramic brake pad after the ceramic reaction is super-processed.

[0089] Example 3

[0090] A carbon ceramic brake pad for a carbon ceramic brake disc, the preparation method comprising the following steps:

[0091] (1) Preparation of carbon ceramic friction surface

[0092] (1.1), the continuous fiber toughened ceramic matrix composite material with a density of 1.8g / cm 3 is densified at 600℃ by using a chemical vapor infiltration method to prepare a C / C blank with a density of 0.8 / cm 3 ;

[0093] Further, the carbon source gas in the chemical vapor infiltration method is petroleum liquefied gas, and the carrier gas is nitrogen;

[0094] (1.2), the C / C blank is graphitized at 2100℃ under vacuum condition for 1h;

[0095] (1.3), wherein the modifier is a mixture of impregnated resin, curing agent, solvent and modified powder, the mixture is pressurized and impregnated at 0.5-1.5MPa, the impregnation time is 1h-3h, and after impregnation, the resin is cured at different temperatures according to the different types of curing agent selected;

[0096] In this embodiment, the impregnated resin is high-residual-carbon epoxy resin, the curing agent is polyamide, the solvent is acetone, and the modified powder is zirconium carbide; the specific proportion of the mixture is that the impregnated resin, the curing agent, the solvent and the modified powder are prepared according to the mass ratio of 100:100:80:40, and the curing temperature condition is 65℃ / 4h.

[0097] (1.4), the blank obtained in step S3 is sintered at 800℃ under vacuum condition for 1h;

[0098] (1.5), steps 3 and 4 are repeated until the density of the blank is 1.2g / cm3;

[0099] (1.6) Rough processing of the blank obtained in step S5, including cutting according to the design size, processing the contour, processing the scribe groove 3 and the tenon 4.

[0100] (2) Preparation of the carbon ceramic backing plate

[0101] (2.1) Preparation of the ceramic slurry, which is a mixture of resin, curing agent, solvent and modified powder;

[0102] In this embodiment, the resin is an epoxy resin with high residual carbon, the curing agent is polyamide, the solvent is acetone, and the ceramic powder used for the modified powder is zirconium carbide; the specific proportions of the mixture are resin, curing agent, solvent and modified powder, prepared according to the mass ratio of 100:100:80:40;

[0103] (2.2) Impregnate the carbon fiber cloth in the ceramic slurry, and after drying, stack it, and finally use 12K or 24K large-tow carbon fiber to make a through seam;

[0104] (2.3) Curing on a hot press, different temperature settings according to the type of curing agent selected, pressure of 1 MPa, to obtain a C / C blank;

[0105] In this embodiment, the curing agent selected is polyamide, and the curing temperature condition is 65℃ / 4h.

[0106] (2.4) Sintering of the C / C blank under vacuum at 800℃ for 1h, sintering to a density of 1.2g / cm 3 ;

[0107] (2.5) Rough processing of the C / C blank, including cutting according to the design size, processing the contour, processing the mounting hole 8 and the tenon groove 6.

[0108] (3) Preparation of the carbon ceramic brake pad

[0109] (3.1) Pre-connection of the carbon ceramic friction surface 2 and the carbon ceramic backing plate 1 through the mortise and tenon structure composed of the tenon 4 embedded in the tenon groove 6;

[0110] (3.2) Placing the pre-connected carbon ceramic friction surface 2 and carbon ceramic backing plate 1 under vacuum at 1500℃, using the reaction melt infiltration method for ceramicization reaction, reaction time of 2h;

[0111] Further, the reaction precursor in the ceramicization reaction is a mixture of silicon powder and iron-silicon powder, and the specific proportions of the mixture are silicon powder and iron-silicon powder prepared according to the mass ratio of 50:100;

[0112] (3.3) Superfinishing of the carbon ceramic brake pad after ceramicization reaction.

[0113] Example 4

[0114] A carbon-ceramic brake pad for grinding carbon-ceramic brake disc, the preparation method comprising the following steps:

[0115] (1) Preparation of carbon-ceramic friction surface

[0116] (1.1) Densifying continuous fiber reinforced ceramic matrix composite material with a density of 2.1 g / cm3 at 900℃ by chemical vapor infiltration to prepare C / C blank with a density of 0.9 g / cm3. 3 3

[0117] Wherein, the carbon source gas in the chemical vapor infiltration method is natural gas, and the carrier gas is argon.

[0118] (1.2) Graphitizing the C / C blank under vacuum at 2500℃ for 3h.

[0119] (1.3) Wherein, the modifier is a mixture of impregnated resin, curing agent, solvent and modified powder, the mixture is subjected to pressure impregnation at 1MPa, the impregnation time is 2h, and after impregnation, the resin is cured at different temperatures according to the type of curing agent selected.

[0120] In this embodiment, the impregnated resin is high-residual-carbon epoxy resin, the curing agent is maleic anhydride, the solvent is acetone, and the modified powder is silicon carbide powder; the specific proportion of the mixture is impregnated resin, curing agent, solvent and modified powder, which are prepared according to the mass ratio of 100:40:60:40, and the curing temperature condition is 180℃ / 3h.

[0121] (1.4) Sintering the blank obtained in step S3 under vacuum at 1000℃ for 3h.

[0122] (1.5) Repeating steps 3 and 4 until the density of the blank is 1.4g / cm3

[0123] (1.6) Rough machining the blank obtained in step S5, including cutting according to the design size, processing the contour, processing the scribe groove 3 and the tenon 4.

[0124] (2) Preparation of carbon-ceramic backing plate

[0125] (2.1) Preparing ceramic slurry, which is a mixture of resin, curing agent, solvent and modified powder.

[0126] ​​In this embodiment, the resin is selected from high carbon phenolic resin, the curing agent is selected from maleic anhydride, the solvent is ethanol, and the modified powder is silicon carbide powder; the specific proportion of the mixture is that the resin, the curing agent, the solvent and the modified powder are prepared according to the mass ratio of 100:40:60:40.

[0127] (2.2) The carbon fiber cloth is immersed in the ceramic slurry and stacked after air drying, and finally 12K or 24K large-tow carbon fibers are used for cross-seam manufacturing.

[0128] (2.3) Curing is performed on a hot press, different temperature settings are performed according to the type of curing agent selected, and the pressure is 3MPa, to obtain a C / C blank.

[0129] In this embodiment, the curing agent selected is maleic anhydride, and the curing temperature condition is 180℃ / 3h.

[0130] (2.4) The C / C blank is sintered under vacuum at 900℃ for 2.5h, and the sintering density of the blank is 1.3g / cm 3 .

[0131] (2.5) Rough machining is performed on the C / C blank, including cutting according to the design size, processing the contour, and processing mounting holes 8 and tenon slots 6.

[0132] (3) Preparation of carbon ceramic brake pad

[0133] (3.1) The carbon ceramic friction surface 2 and the carbon ceramic backing plate 1 are pre-connected through the mortise and tenon structure formed by the tenon 4 embedded in the tenon slot 6.

[0134] (3.2) The pre-connected carbon ceramic friction surface 2 and carbon ceramic backing plate 1 are placed in a vacuum condition at 1500℃, and a ceramic reaction is performed using a reaction melt infiltration method, and the reaction time is 2h;

[0135] Further, the reaction precursor in the ceramic reaction is a mixture of silicon powder and iron-silicon powder, and the specific proportion of the mixture is that the silicon powder and the iron-silicon powder are mixed according to the mass ratio of 30:70.

[0136] (3.3) Superfinishing is performed on the carbon ceramic brake pad after the ceramic reaction.

[0137] Although the specific embodiments of the invention are described in detail with reference to the accompanying drawings, it should not be understood as limiting the scope of protection of the patent. Various modifications and variations made by those skilled in the art within the scope described in the claims are still within the scope of protection of the patent.

Claims

1. A carbon-carbide brake pad for a carbon-carbide brake disc, characterized in that: The carbon ceramic lining plate (1) and the carbon ceramic friction surface (2) are installed on the carbon ceramic lining plate (1). The carbon ceramic lining plate (1) is a two-dimensional laminated preform, and the carbon ceramic friction surface (2) is a three-dimensional needle-punched preform. A plurality of mortises (6) are arranged on the upper surface of the carbon ceramic lining plate (1), and a plurality of tenons (4) matched with the mortises (6) are arranged on the lower surface of the carbon ceramic friction surface (2), the tenons (4) are embedded in the mortises (6) to form a mortise-and-tenon structure, and the carbon ceramic lining plate (1) and the carbon ceramic friction surface (2) are connected. The ear plates (5) are arranged on the circumference of the carbon ceramic lining plate (1), and mounting holes (8) are arranged on the ear plates (5). The carbon ceramic friction surface (2) is prepared by the following method: Step S1, the continuous fiber toughened ceramic matrix composite material with density of 1.8~2.5g / cm 3 Is densified at 600~1200℃ by chemical vapor infiltration method to prepare C / C blank with density of 0.8~1.0g / cm 3 ​ In step S2, the C / C blank body is graphitized under vacuum at 2100-2800 DEG C for 1-6 hours. In step S3, the C / C blank body obtained in step S2 is modified by a precursor impregnation method, wherein the modifier is a mixture of impregnated resin, curing agent, solvent and modified powder, the mixture is impregnated under pressure of 0.5-1.5 MPa for 1-3 hours, and after impregnation, the resin is cured at different temperatures according to the type of curing agent selected. In step S4, the blank body obtained in step S3 is sintered under vacuum at 800-1100 DEG C for 1-4 hours. In step S5, steps 3 and 4 are repeated until the density of the blank body is 1.2-1.5 g / cm3. In step S6, the blank body obtained in step S5 is rough machined, including cutting according to the design size, processing the contour, processing the scribing groove (3) and the tenon (4).

2. The carbon-carbon brake pad for lining the carbon-carbon brake disc according to claim 1, characterized in that: A plurality of scribing grooves (3) are arranged on the upper surface of the carbon ceramic friction surface (2).

3. The carbon-carbon brake pad for lining the carbon-carbon brake disc as claimed in claim 1 wherein: The number of scribing grooves (3) is 1-4, and the scribing grooves (3) are symmetrically distributed along the central axis of the carbon ceramic friction surface (2).

4. The carbon-carbon brake pad for lining the carbon-carbon brake disc according to claim 3, characterized in that: The width L1 of the scribing groove (3) is 1-5 mm, and the depth H1 of the scribing groove (3) is 1-5 mm.

5. The carbon-carbon brake pad of claim 1 wherein: The angle θ of the tenon (4) is 75-90 DEG, the number of mortises (6) is 1-4, the depth H4 of the mortise (6) is 3-8 mm, and the width L2 of the mortise (6) is 15-50 mm.

6. The carbon-carbon brake pad of claim 1 wherein: A heat-resistant adhesive layer (7) is arranged between the carbon ceramic lining plate (1) and the carbon ceramic friction surface (2).

7. The carbon-carbon brake pad for lining a carbon-carbon brake disc according to claim 6, characterized in that: The heat-resistant adhesive layer (7) is an inorganic high-temperature adhesive, wherein the amount of resin is 80-120 parts, the amount of curing agent is 30-80 parts, and the amount of filler is 70-120 parts.

8. The carbon-carbon brake pad of claim 1, wherein, The carbon ceramic lining plate (1) is prepared by the following method: In step A1, ceramic slurry is prepared, which is a mixture of resin, curing agent, solvent and modified powder; In step A2, carbon fiber cloth is impregnated in the ceramic slurry, and after drying, it is laminated, and finally 12K or 24K large-tow carbon fibers are used for cross-seam preparation; In step A3, curing is performed on a hot press, different temperature settings are performed according to the type of curing agent selected, and the pressure is 1-5 MPa to obtain a C / C blank body. Step A4, sintering the C / C green body under vacuum condition at 800-1100℃ for 1h-4h, until the density of the green body is 1.2-1.5g / cm 3 ; Step A5, rough machining of C / C blank, including cutting according to design size, machining contour, machining mounting hole (8) and mortise (6).

9. A method of manufacturing carbon-carbon brake pads for carbon-carbon brake discs as claimed in claim 1, wherein: Comprising the following steps: Step B1, pre-connecting carbon-tao friction surface (2) and carbon-tao lining plate (1) through mortise and tenon structure composed of mortise (6) and tenon (4); Step B2, placing pre-connected carbon-tao friction surface (2) and carbon-tao lining plate (1) in vacuum condition at 1500 DEG C, and performing ceramic reaction by using reaction melting infiltration method, reaction time is 2h; Step B3, super-finishing carbon-tao brake pad after ceramic reaction.

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