A carbon fiber-based automotive disc brake lining material and its preparation method

Abstract

The application relates to the technical field of brake pad material preparation, and particularly discloses a carbon fiber-based disc brake pad material for automobiles and a preparation method thereof. The carbon fiber-based disc brake pad material for automobiles is mainly prepared from the following raw materials: composite fibers, a binder, barium sulfate, cashew nut shell powder, kaolin, a friction modifier, cork powder and antimony sulfide. The preparation method comprises the following steps: uniformly mixing and stirring the composite fibers, the binder, the barium sulfate, the cashew nut shell powder, the kaolin, the friction modifier, the cork powder and the antimony sulfide to obtain a mixture; placing the mixture into a mold cavity and performing hot pressing to form a hot-pressed product; and cooling the hot-pressed product to obtain a hot-pressed product; and performing temperature rising heat treatment on the hot-pressed product. The carbon fiber-based disc brake pad material for automobiles has stable friction performance.

Description

Technical Field

[0001] The present application relates to the technical field of brake lining material preparation, and more specifically, to a carbon fiber-based automotive disc brake lining material and a preparation method thereof. Background Art

[0002] Automotive brake linings, also known as friction materials and commonly referred to as brake pads, are essential functional materials for automotive braking systems. Their performance must meet several key requirements, including an appropriate coefficient of friction, reliable safety, satisfactory comfort, and a reasonable service life. Their quality directly impacts the vehicle's operability, reliability, and comfort, and significantly influences driving safety.

[0003] Brake linings are generally divided into two categories. One is made of asbestos materials. However, asbestos friction linings have been banned in some countries due to their toxicity, poor braking performance, poor heat resistance and low strength. The other is made of asbestos-free materials. The friction material of this type of brake lining is generally a semi-metallic or low-metal mixed friction material, such as steel fiber, or a material containing steel fiber.

[0004] Steel fibers are prone to rusting, and after rusting, they may become stuck together, which may cause damage to the brake pads. At the same time, steel fibers have poor high temperature resistance and are sensitive to temperature changes, making the friction performance of the brake pads unstable. Summary of the Invention

[0005] In order to improve the friction performance stability of brake linings, the present application provides a carbon fiber-based automotive disc brake lining material and a preparation method thereof.

[0006] In a first aspect, the present application provides a carbon fiber-based automotive disc brake lining material, which adopts the following technical solution:

[0007] A carbon fiber-based automotive disc brake lining material is mainly made of the following raw materials in parts by weight: 20-40 parts of composite fiber, 10-15 parts of binder, 5-10 parts of barium sulfate, 5-10 parts of cashew nut shell powder, 10-20 parts of kaolin, 30-40 parts of friction enhancer, 1-2 parts of cork powder, and 1-2 parts of antimony sulfide. The composite fiber is composed of aramid fiber and carbon fiber in a mass ratio of (2-3):(5-6), and the friction enhancer is at least two of tetrapod-shaped zinc oxide whiskers, aluminum silicate fiber, and glass fiber wool.

[0008] Preferably, the binder is boron-modified phenolic resin.

[0009] Preferably, the phenolic resin needs to be dissolved before use, and the dissolving solvent is an ethanol solution.

[0010] By adopting the above technical solution, the present application adopts composite fibers instead of single fibers, giving the product multiple properties and potentially reducing costs. The binder used in the present application is a boron-modified phenolic resin, which has high temperature resistance, good water resistance and heat resistance, and is convenient for reducing the phenomenon of thermal decay caused by excessive temperature. The friction enhancer plays the role of friction, wear resistance, heat resistance, and corrosion resistance, increases the friction coefficient, compensates for the low friction coefficient caused by barium sulfate, protects the dual surface, controls the formation of the friction layer, and increases the bite with the friction pair surface. The content of the friction enhancer has a great influence on the friction and wear properties of the material. Excessive content will aggravate the damage to the dual surface.

[0011] Barium sulfate has good dispersibility, making the surface of the friction material smoother. Barium sulfate also has good stability and moderate hardness. Adding it to the friction material can reduce damage to the friction material.

[0012] Cork powder is a porous filler that can reduce the density of the friction material, forming a loose structure on the friction surface, improving the self-cleaning performance of the friction material surface, and reducing the continuous formation of the carbonized layer, thereby reducing the degree of thermal decay and correspondingly reducing brake noise;

[0013] Cashew nut shell liquid friction powder is processed from cashew nut shell liquid and can improve the interface bonding condition between fiber and powder in brake pads. It can decompose at high temperature to prevent the temperature of the friction interface from further increasing.

[0014] The benzene rings of aramid fibers are linked to amide groups in the para position, forming a rod-shaped, rigid macromolecular chain structure with regular molecular arrangement. Due to their excellent crystallinity and orientation, they have high strength and modulus, and are also very resistant to high temperatures. Aramid fibers have a stable coefficient of friction at both low and high temperatures, resulting in low wear. They also have good filler retention and excellent processing aid capabilities, ensuring sufficient strength for pre-processing.

[0015] Carbon fiber materials are not only light in weight, high in specific strength and modulus, but also have good thermal conductivity, creep resistance, wear resistance, and corrosion resistance. In addition, carbon fiber materials have good high temperature resistance, fast vibration attenuation, and low vibration transmission.

[0016] The addition of antimony sulfide can reduce the amount of binder used, and antimony sulfide can reduce the thermal decay of the friction coefficient, reduce high-temperature wear of the product, and increase friction stability. In addition, the low hardness of antimony sulfide can also reduce the braking noise of the friction plate;

[0017] Kaolin acts as a filler in brake linings and affects the performance of brake pads. It is cheap, which helps reduce the cost of brake pads, reduce brake noise and reduce thermal fading.

[0018] Preferably, the composite fiber, binder and friction enhancer are composed in a mass ratio of (25-35):(12-13):(35-38).

[0019] By adopting the above technical solution, the ratio of the three components of composite fiber, binder and friction enhancer is adjusted to achieve the optimal ratio of the three components. The inventors of this application speculate that it is possible to further improve the heat resistance and friction performance of the obtained carbon fiber-based automotive disc brake lining material, and at the same time, reduce the noise generated by the carbon fiber-based automotive disc brake lining material during the braking process.

[0020] Preferably, the friction enhancer is composed of tetrapod-shaped zinc oxide whiskers, aluminum silicate fibers, and glass fiber cotton in a mass ratio of (5-8):(3-4):(3-5).

[0021] By adopting the above technical solution, the friction enhancer is obtained by compounding three components: tetrapod-shaped zinc oxide whiskers, aluminum silicate fibers, and glass fiber wool. By adjusting the ratio of the three components, the ratio of the three components can be optimized. The aluminum silicate fibers have excellent thermal insulation properties, good acid and alkali corrosion resistance, and excellent chemical stability; they are electrical insulators and have good sound absorption properties; the glass fiber wool has a porous structure with many tiny gaps and holes connected internally and externally. When sound waves are emitted through it, they cause the gas in the gaps to vibrate; due to the viscous friction resistance of the gas, the friction between the gas and the hole edges, and the heat conduction effect, the sound is converted into energy and consumed; the tetrapod-shaped zinc oxide whiskers appear as a white loose powder with a four-needle three-dimensional structure. The whiskers have a core with four needle-shaped branches extending radially from the core. Due to the unique three-dimensional structure, they are easily evenly distributed in the base material, acting as a skeleton and significantly increasing the tensile strength. The three components cooperate with each other to facilitate improving the friction performance of the brake lining.

[0022] Preferably, the aluminum silicate fiber is a modified fiber, and the preparation method of the modified fiber comprises the following steps: dipping the aluminum silicate fiber in styrene-butadiene emulsion, stirring evenly, then adding graphite, mixing evenly, taking out and drying to obtain the modified fiber.

[0023] By adopting the above technical solution, the aluminum silicate fiber is immersed in a styrene-butadiene emulsion to form a bonding layer on the surface of the fiber. Then, after the graphite is mixed with the aluminum silicate fiber containing the bonding layer, the graphite adheres to the surface of the aluminum silicate fiber under the action of the bonding layer, and a sound-absorbing layer may be formed on the surface of the aluminum silicate fiber, which may reduce the noise of the carbon fiber-based automotive disc brake lining material during use.

[0024] Preferably, the diameter of the aluminum silicate fiber is 3-5 μm and the length is 0.1-0.2 mm.

[0025] By adopting the above technical solution, the diameter of the aluminum silicate fiber of the present application is relatively large and the heat resistance is strong, which is convenient for increasing the contact area with graphite, may adhere to more graphite, and may further reduce the noise of the carbon fiber-based automotive disc brake lining material during use.

[0026] Preferably, the aluminum silicate fiber is pretreated to obtain pretreated aluminum silicate fiber. The preparation method of the pretreated aluminum silicate fiber comprises the following steps: mixing aluminum silicate fiber, water, ethanol, ammonia water, and ethyl orthosilicate, stirring for 5-7 hours, and drying to obtain the pretreated aluminum silicate fiber.

[0027] Preferably, the mass ratio of the aluminum silicate fiber, water, ethanol, ammonia water and ethyl orthosilicate is (1-2):(70-90):(80-90):(3-4):(3-4).

[0028] Preferably, the drying temperature is 80-90°C.

[0029] Preferably, the volume concentration of the ammonia water is 25-26%.

[0030] By adopting the above technical solution, a silicon dioxide layer is grown on the surface of the aluminum silicate fiber. The nano-protrusion structure of the silicon dioxide layer increases the surface roughness of the fiber, so as to improve the anchoring effect of graphite on the surface of the aluminum silicate fiber.

[0031] Preferably, the particle size distribution of the graphite is as follows: 5-8 nm accounts for 20-25% by mass, 8-15 nm accounts for 30-35% by mass, 15-20 nm accounts for 25-30% by mass, and 20-25 nm accounts for 15-20% by mass.

[0032] By adopting the above technical solution, graphite, a crystalline carbon that is soft, porous, and lubricating, can be added to the friction material to reduce the friction coefficient of the friction material to a certain extent, reducing friction noise. The porous structure can also fully absorb braking noise. The porous structure also creates a loose friction surface that improves the self-cleaning properties of the friction material, reduces the continuous formation of the carbonized layer, and thus reduces thermal decay and friction noise. Using graphite of varying particle sizes not only improves the stability of the sound-absorbing layer formed on the outer layer of the aluminum silicate fiber, but also extends the sound transmission path, enhancing the noise reduction performance of the modified aluminum silicate fiber, potentially reducing braking noise during use of the brake pad.

[0033] Preferably, the binder is composed of phenolic resin, calcium carbonate whiskers and potassium titanate in a mass ratio of (7-9):(2-3):(2-3).

[0034] Preferably, the binder is composed of phenolic resin, calcium carbonate whiskers, and potassium titanate in a mass ratio of 9:3:3.

[0035] Preferably, the phenolic resin is a boron-modified phenolic resin.

[0036] By adopting the technical scheme, the potassium titanate can effectively reduce the friction of the friction material. The addition of the potassium titanate in the friction material facilitates reduction of the wear rate of the friction material, and the high-temperature sound absorption performance of the potassium titanate can reduce the adverse effects of noise pollution. The potassium titanate can also significantly improve the wear resistance and impact resistance of the prepared friction material, thereby prolonging the service life of the friction material. The diameter of the calcium carbonate whisker is small, and the calcium carbonate whisker has a tackifying effect, thereby facilitating improvement of the bonding effect of the binder and the friction performance of the automobile brake pad.

[0037] In a second aspect, the application provides a preparation method of a carbon fiber-based disc brake pad material for automobiles, which adopts the following technical scheme:

[0038] The preparation method of the carbon fiber-based disc brake pad material for automobiles comprises the following steps:

[0039] (1) mixture preparation: the composite fiber, the binder, the barium sulfate, the cashew nut shell powder, the kaolin, the friction modifier, the cork powder and the antimony sulfide are uniformly mixed and stirred to obtain a mixture;

[0040] (2) hot pressing forming: the mixture obtained in the step (1) is placed into a mold cavity for hot pressing forming, and the hot pressing forming product is obtained after cooling;

[0041] (3) heat treatment: the hot pressing forming product obtained in the step (2) is subjected to temperature rising heat treatment, and the disc brake pad material for automobiles is obtained.

[0042] Preferably, the mixing equipment in the step (1) is a plowshare type mixer, the plow speed is 12HZ, and the flying knife speed is 50HZ.

[0043] Preferably, the preparation method of the mixture comprises the following steps:

[0044] S1 mixture preparation: the composite fiber, the binder and the friction modifier are mixed to obtain a mixture one;

[0045] S2 mixture two preparation: the barium sulfate, the cashew nut shell powder, the kaolin, the cork powder and the antimony sulfide are mixed to obtain a mixture two; S3 mixture preparation: the mixture one and the mixture two are mixed, and the mixture is obtained.

[0046] Preferably, the hot pressing pressure in the step (2) is 35Mpa, the hot pressing forming time is 6-10min, the upper mold temperature is 160℃, and the lower mold temperature is 150℃.

[0047] Preferably, the heat treatment temperature in the step (3) is 250℃, and the heat treatment time is 5-8h.

[0048] By adopting the above technical solution, the preparation process of the carbon fiber-based automotive disc brake lining material prepared in this application is simple, the prepared carbon fiber-based automotive disc brake lining material has good mold resistance, reduces the noise of the brake lining material during braking, and uses composite fibers instead of single fibers to retain the advantages of the product while giving the product other advantages.

[0049] In summary, this application has the following beneficial effects:

[0050] 1. The carbon fiber-based automotive disc brake lining material of the present application uses composite fibers composed of aramid fibers and carbon fibers, which facilitates reducing the preparation cost of the brake lining and, at the same time, improves the friction performance of the brake lining.

[0051] 2. A friction enhancer is added to the carbon fiber-based automotive disc brake lining material of the present application. The friction enhancer plays the role of friction, anti-wear, heat resistance, corrosion resistance, etc., increases the friction coefficient, compensates for the low friction coefficient caused by barium sulfate, protects the dual surface, controls the formation of the friction layer, and increases the bite with the friction pair surface to further improve the friction performance of the brake lining. DETAILED DESCRIPTION

[0052] The present application is further described in detail below with reference to the embodiments.

[0053] The composite fiber of the present application is composed of aramid fiber and carbon fiber in a mass ratio of (2-3):(5-6). More preferably, the composite fiber is composed of aramid fiber and carbon fiber in a mass ratio of 2:5.

[0054] The diameter of the aluminum silicate fiber of the present application is 3-5 μm and the length is 0.1-0.2 mm.

[0055] The particle size of the kaolin in this application is 400 mesh.

[0056] The particle size of the graphite in this application is 10-15 nm.

[0057] The particle size of the barium sulfate in the present application is 5-10 μm.

[0058] The aramid fiber of the present application has a length of 1-3 mm and a diameter of 0.5 mm.

[0059] The carbon fiber of the present application has a length of 1-3 mm and a diameter of 0.5 mm.

[0060] The cashew nut shell powder of the present application has a particle size of 5-10 μm.

[0061] The particle size of the cork powder in the present application is 300-400 mesh.

[0062] The particle size of the antimony sulfide of the present application is 300-400 mesh.

[0063] Example

[0064] Example 1

[0065] A carbon fiber-based automotive disc brake lining material, the raw material amounts of which are shown in Table 1, includes: barium sulfate with a particle size of 8 μm; composite fiber composed of aramid fiber and carbon fiber in a mass ratio of 2:5; a binder comprising boron-modified phenolic resin; cashew nut shell powder with a particle size of 8 μm; kaolin with a particle size of 400 mesh; a friction enhancer composed of tetrapod-shaped zinc oxide whiskers and aluminum silicate fibers in a mass ratio of 1:1; and cork powder with a particle size of 300 mesh. The aluminum silicate fibers have a diameter of 3-5 μm and a length of 0.1-0.2 mm.

[0066] The preparation process of the carbon fiber-based automotive disc brake lining material comprises the following steps:

[0067] (1) Preparation of mixture: composite fiber, binder, barium sulfate, cashew nut shell powder, kaolin, friction enhancer, cork powder, and antimony sulfide are mixed and stirred uniformly to obtain a mixture; the preparation method of the mixture comprises the following steps: S1 Preparation of mixture 1: composite fiber, binder, and friction enhancer are mixed to obtain mixture 1; S2 Preparation of mixture 2: barium sulfate, cashew nut shell powder, kaolin, cork powder, and antimony sulfide are mixed to obtain mixture 2; S3 Preparation of mixture: mixture 1 and mixture 2 are mixed to obtain; wherein the mixing equipment is a plow-type mixer, the plow speed is 12 Hz, and the flying knife speed is 50 Hz;

[0068] (2) Hot pressing: placing the mixture obtained in step (1) into a mold cavity for hot pressing, and cooling to obtain a hot pressing molded product; wherein the hot pressing pressure is 35 MPa, the hot pressing time is 8 minutes, the upper mold temperature is 160°C, and the lower mold temperature is 150°C;

[0069] (3) Heat treatment: subjecting the hot-pressed product obtained in step (2) to a heat treatment at a temperature of 250° C. for a time of 5-8 h.

[0070] Table 1 Amount of raw materials used for carbon fiber-based automotive disc brake lining materials in Examples 1-5

[0071]

[0072] Example 2-5: A carbon fiber-based automotive disc brake lining material, which differs from Example 1 in that the amounts of raw materials used are as shown in Table 1.

[0073] Example 6: A carbon fiber-based automotive disc brake lining material, which differs from Example 4 in that the friction enhancer is composed of tetrapod-shaped zinc oxide whiskers, aluminum silicate fibers, and glass fiber cotton in a mass ratio of 5:3:3.

[0074] Example 7: A carbon fiber-based automotive disc brake pad material, which is different from Example 4 in that the friction modifier is composed of four needle-shaped zinc oxide whiskers, aluminum silicate fibers, and glass fiber cotton in a mass ratio of 8:4:5.

[0075] Example 8: A carbon fiber-based automotive disc brake pad material, which is different from Example 4 in that the aluminum silicate fibers are modified aluminum silicate fibers, and the preparation method of the modified aluminum silicate fibers comprises the following steps: immersing the aluminum silicate fibers in a butadiene emulsion, stirring uniformly, then adding graphite, mixing uniformly, and taking out and drying to obtain the modified aluminum silicate fibers. The mass ratio of the aluminum silicate fibers to the graphite is 3:10. The particle size of the graphite is 15 nm, the diameter of the aluminum silicate fibers is 3-5 um, and the length is 0.1-0.2 mm.

[0076] Example 9: A carbon fiber-based automotive disc brake pad material, which is different from Example 8 in that the aluminum silicate fibers are pretreated to obtain pretreated aluminum silicate fibers, and the preparation method of the pretreated aluminum silicate fibers comprises the following steps: mixing the aluminum silicate fibers, water, ethanol, ammonia, and tetraethyl orthosilicate, stirring for 6 h, and drying to obtain the pretreated aluminum silicate fibers. The drying temperature is 90°C. The mass ratio of the aluminum silicate fibers, water, ethanol, ammonia, and tetraethyl orthosilicate is 1:80:90:4:4.

[0077] Example 10: A carbon fiber-based automotive disc brake pad material, which is different from Example 8 in that the particle size grading of the graphite is 5-8 nm with a mass ratio of 25%, 8-15 nm with a mass ratio of 35%, 15-20 nm with a mass ratio of 25%, and 20-25 nm with a mass ratio of 15%.

[0078] Example 11: A carbon fiber-based automotive disc brake pad material, which is different from Example 8 in that the binder is composed of phenolic resin, calcium carbonate whiskers, and potassium titanate in a mass ratio of 9:3:3.

[0079] Comparative Example

[0080] Comparative Example 1: A carbon fiber-based automotive disc brake pad material, which is different from Example 1 in that no friction modifier is added.

[0081] Comparative Example 2: A carbon fiber-based automotive disc brake pad material, which is different from Example 1 in that the friction modifier is four needle-shaped zinc oxide whiskers.

[0082] Comparative Example 3: A carbon fiber-based automotive disc brake pad material, which is different from Example 1 in that the fibers are aramid fibers.

[0083] Detection Method

[0084] Friction performance test: The carbon fiber-based automotive disc brake lining materials prepared in Examples 1-11 and Comparative Examples 1-3 were tested for friction coefficient and wear rate according to the test method in GB5763-2008 "Automotive Brake Linings" at a temperature of 300°C. The test results are shown in Table 2.

[0085] Braking noise performance test: The carbon fiber-based automotive disc brake lining materials prepared in Examples 1-11 were installed in corresponding positions on the vehicle, and the braking noise was tested using a noise tester during braking at a temperature of 300°C. The test results are shown in Table 2.

[0086] Table 2 Performance test results of carbon fiber-based automotive disc brake lining materials of Examples 1-11 and Comparative Examples 1-3

[0087]

[0088]

[0089] The carbon fiber-based automotive disc brake lining material prepared in the present application complies with the standard of GB 5763-2008 "Automobile Brake Lining".

[0090] In conjunction with Examples 1-5 and the data in Table 2, it can be seen that the carbon fiber-based automotive disc brake lining materials prepared in Examples 1-5 have a high friction coefficient and a low wear rate at 300°C, and at the same time, the braking noise is low. The inventors of the present application speculate that the friction enhancer and other components in the brake lining material cooperate with each other, which may, on the one hand, increase the friction coefficient of the carbon fiber-based automotive disc brake lining material, while at the same time reducing the wear rate and braking noise of the brake lining during use.

[0091] In combination with Examples 6-7 and Example 4, and in combination with the data in Table 2, it can be seen that the friction enhancer in Examples 6-7 is obtained by compounding three components: four-needle zinc oxide whiskers, aluminum silicate fibers, and glass fiber cotton, and the friction enhancer in Example 4 is obtained by compounding two components: four-needle zinc oxide whiskers and aluminum silicate fibers. Compared with Example 4, the friction coefficients of Examples 6-7 are greater than the friction coefficient of Example 4, and the wear rate of Example 6-7 is less than the wear rate of Example 4. The braking noise of Example 6-7 is less than the braking noise of Example 4. The inventors of the present application speculate that when the friction enhancer is compounded with the three components and cooperates with other materials of the brake lining, it may increase the friction coefficient of the carbon fiber-based automotive disc brake lining material while reducing the wear rate and braking noise of the carbon fiber-based automotive disc brake lining material.

[0092] It can be seen from the combination of Example 4, Example 8 and the data in Table 2 that the aluminum silicate fiber used in Example 8 is a modified aluminum silicate fiber, and the modified aluminum silicate fiber is wrapped with an acoustic layer on the outer layer of the aluminum silicate fiber. Compared with Example 4, the carbon fiber-based disc brake pad material for automobile prepared in Example 8 has a large friction coefficient, a small wear rate and a small brake noise. The present inventors speculate that the acoustic layer formed on the surface of the aluminum silicate fiber may have a greater impact on brake noise.

[0093] It can be seen from the combination of Example 8-9 and the data in Table 2 that the aluminum silicate fiber in the modified aluminum silicate fiber in Example 9 is subjected to roughening treatment, so that the surface of the aluminum silicate fiber becomes rough, thereby improving the connection strength between the aluminum silicate fiber and the acoustic material. Compared with Example 8, the brake pad of Example 9 has a large friction coefficient, a small wear rate and a small brake noise.

[0094] It can be seen from the combination of Example 8, Example 10 and the data in Table 2 that the particle size of the acoustic material in the modified aluminum silicate fiber in Example 10 is adjusted. Compared with Example 8, the carbon fiber-based disc brake pad material for automobile prepared in Example 10 has a small brake noise. The present inventors speculate that the acoustic layer formed by the acoustic material on the surface of the aluminum silicate fiber may reduce the brake noise during the braking process of the brake pad.

[0095] It can be seen from the combination of Example 8, Example 11 and the data in Table 2 that the carbon fiber-based disc brake pad material for automobile prepared in Example 11 has a larger friction coefficient, a lower wear rate and a lower brake noise compared with Example 8.

[0096] It can be seen from the combination of Example 1, Comparative Example 1 and the data in Table 2 that the difference between Comparative Example 1 and Example 1 is that no friction modifier is added in Comparative Example 1. Therefore, the carbon fiber-based disc brake pad material for automobile prepared in Comparative Example 1 has a lower friction coefficient.

[0097] It can be seen from the combination of Example 1, Comparative Example 2 and the data in Table 2 that the difference between Comparative Example 2 and Example 1 is that the friction modifier added in Comparative Example 2 is a single substance. Therefore, the carbon fiber-based disc brake pad material for automobile prepared in Comparative Example 2 has a lower friction coefficient compared with Example 1.

[0098] It can be seen from the combination of Example 1, Comparative Example 3 and the data in Table 2 that the difference between Comparative Example 3 and Example 1 is that the fiber added in Comparative Example 2 is a single fiber. Therefore, the carbon fiber-based disc brake pad material for automobile prepared in Comparative Example 3 has a lower friction coefficient compared with Example 1.

[0099] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A carbon fiber-based automotive disc brake lining material, characterized in that: The invention is prepared from the following raw materials in parts by weight: 20-40 parts of composite fiber, 10-15 parts of binder, 5-10 parts of barium sulfate, 5-10 parts of cashew nut shell powder, 10-20 parts of kaolin, 30-40 parts of friction enhancer, 1-2 parts of cork powder, and 1-2 parts of antimony sulfide; the composite fiber comprises aramid fiber and carbon fiber in a mass ratio of (2-3):(5-6); the friction enhancer comprises tetrapod-shaped zinc oxide whisker and aluminum silicate fiber in a mass ratio of 1:1; the aluminum silicate fiber is a modified fiber, and the preparation method of the modified fiber comprises the following steps: immersing the aluminum silicate fiber in styrene-butadiene emulsion, stirring evenly, then adding graphite, mixing evenly, taking out and drying to obtain the modified fiber; and the binder comprises phenolic resin, calcium carbonate whisker, and potassium titanate in a mass ratio of 9:3:

3.

2. The carbon fiber-based automotive disc brake lining material according to claim 1, characterized in that: The composite fiber, the binder and the friction enhancer are composed in a mass ratio of (25-35):(12-13):(35-38).

3. The carbon fiber-based automotive disc brake lining material according to claim 1, characterized in that: The diameter of the aluminum silicate fiber is 3-5 μm, and the length is 0.1-0.2 mm.

4. The carbon fiber-based automotive disc brake lining material according to claim 1, characterized in that: The aluminum silicate fiber is pretreated to obtain pretreated aluminum silicate fiber. The preparation method of the pretreated aluminum silicate fiber comprises the following steps: mixing aluminum silicate fiber, water, ethanol, ammonia water and ethyl orthosilicate, stirring for 5-7 hours, and drying to obtain the pretreated aluminum silicate fiber.

5. The carbon fiber-based automotive disc brake lining material according to claim 1, characterized in that: The particle size distribution of the graphite is as follows: 5-8nm accounts for 20-25% by mass, 8-15nm accounts for 30-35% by mass, 15-20nm accounts for 25-30% by mass, and 20-25nm accounts for 15-20% by mass.

6. A method for preparing the carbon fiber-based automotive disc brake lining material according to any one of claims 1 to 5, characterized in that: The steps include: (1) Preparation of mixture: the composite fiber, binder, barium sulfate, cashew nut shell powder, kaolin, friction enhancer, cork powder and antimony sulfide are mixed and stirred to obtain a mixture; (2) Hot pressing: placing the mixture obtained in step (1) into a mold cavity for hot pressing, and cooling to obtain a hot pressing molded product; (3) Heat treatment: The hot-pressed product obtained in step (2) is subjected to a heat treatment at elevated temperature.

Images