CN113929479A - Carbon-silicon composite material for new energy automobile brake disc and preparation method thereof - Google Patents
Carbon-silicon composite material for new energy automobile brake disc and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a carbon-silicon composite material for a new energy automobile brake disc and a preparation method thereof, and is characterized by comprising the following steps: step S101, preparing a prepreg, namely uniformly mixing carbon fibers, silicon nitride fibers and ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings, and drying to constant weight to obtain the prepreg; s102, forming a brake disc prefabricated product; step S103, carbonization treatment; step S104, dipping/cracking the carbon-silicon precursor, and dipping, curing and cracking by using silicon powder co-modified by silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane as a dipping agent; and step S105, post-processing. The carbon-silicon composite material for the new energy automobile brake disc disclosed by the invention is good in wear resistance, good in durability, high temperature resistance and mechanical properties, and excellent in braking performance.
Description
Technical Field
The invention relates to the technical field of brake materials, in particular to a carbon-silicon composite material for a brake disc of a new energy automobile and a preparation method thereof.
Background
With the development of society, global energy crisis is continuously aggravated, petroleum resources are gradually exhausted, atmospheric pollution and global warming are increasingly serious, and new energy automobiles which rely on clean and pollution-free new energy as driving force are produced. The automobile can avoid or reduce the use of traditional fuels, is beneficial to promoting environmental protection and relieving the crisis of shortage of traditional energy sources, and has wide market development prospect. However, in recent years, traffic accidents of new energy automobiles are frequent due to the problem of a brake system, and the problem of driving safety of new energy automobiles draws sufficient attention.
The brake disc is an important component of an automobile brake system, and the braking performance of the brake disc is directly related to the driving safety of a vehicle. The braking performance of the brake disc is closely related to the material of the brake disc. The ideal brake disc material needs to have the advantages of light weight, high friction factor, stable braking, corrosion resistance, oxidation resistance, high temperature resistance, good performance stability, long service life and the like. At present, the brake disc material uses cast iron (steel) material as the owner, and the biggest drawback of cast iron brake disc is that the heat dissipation is slow, causes the brake disc high temperature easily when braking or long-time braking under high speed state, and then leads to frictional force to reduce and lead to the brake to become invalid. As modification, the brake disc material made of the aluminum alloy material basically solves the problems of poor wear resistance, poor heat dissipation effect, large mass, high friction force, high temperature and thermal attenuation and the like of the existing cast iron brake disc, but the strength, hardness, wear resistance, fatigue resistance and the like of the existing brake disc material made of the aluminum alloy material still need to be improved.
The carbon-silicon composite material is a novel brake disc material, has a series of excellent performances such as high specific strength, high specific modulus, excellent high-temperature mechanical property, high-temperature thermal stability, high thermal conductivity, low thermal expansion coefficient and the like, and also has the advantages of long service life, adaptability to oxidation resistance, ablation resistance and low wear resistance, however, the carbon-silicon composite material on the market still has the defects of poor material performance stability, easy cracking failure in the using process and further improved wear resistance, durability and high temperature resistance; low preparation efficiency, easy surface incrustation, overlong production period, high process cost and the like.
In order to solve the problems, Chinese patent 201510946901.4 discloses an automobile brake pad, which is prepared from 3-25wt% of potassium hexatitanate whisker or sodium hexatitanate whisker, 0-20wt% of aluminum silicate hollow sphere, 0.1-15wt% of brown corundum, 0.1-20wt% of carbon fiber, 3-30wt% of phenolic resin and 5-50wt% of filler. The invention also provides a preparation method of the automobile brake pad. The potassium (sodium) hexatitanate whisker reinforced resin-based brake pad has low noise, low heat fading, difficult damage to mating parts and extremely low wear rate, not only can prolong the service life of the product to the utmost extent, but also can reduce the resource consumption and reduce the influence on the environment. The raw materials selected in the invention are common and easy to obtain, the production cost can be effectively reduced, and the method has great significance for improving the added value of abundant mineral resources in China. But the formula is complex, the wear rate is high, and the mechanical property is low.
Therefore, the carbon-silicon composite material for the brake disc of the new energy automobile, which has the advantages of good wear resistance, good durability, high temperature resistance, good mechanical property and excellent braking performance, and the preparation method thereof, are developed, meet the market demand, have higher economic value, social value and popularization and application value, and have very important significance for promoting the development of the carbon-silicon composite material and improving the driving safety of the new energy automobile.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the carbon-silicon composite material for the brake disc of the new energy automobile, which has good wear resistance, durability, high temperature resistance, good mechanical property and excellent braking performance. Meanwhile, the invention also provides a preparation method of the carbon-silicon composite material for the new energy automobile brake disc, and the preparation method is simple, convenient to operate, low in energy consumption, high in preparation efficiency and finished product qualification rate, and suitable for continuous large-scale production and application.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of a carbon-silicon composite material for a brake disc of a new energy automobile is characterized by comprising the following steps:
step S101, prepreg preparation: uniformly mixing carbon fibers, silicon nitride fibers and ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings, and drying to constant weight to obtain a prepreg;
step S102, forming of the brake disc prefabricated product: preparing a prefabricated product of the automobile brake disc by adopting a compression molding process;
step S103, carbonization: carbonizing the brake disc prefabricated product manufactured in the step S102;
step S104, dipping/cracking of the carbon-silicon precursor: silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silicon powder are used as impregnants to carry out impregnation curing and cracking;
step S105, post-processing: and sequentially carrying out heat treatment and finish machining to prepare the finished product of the carbon-silicon composite material for the brake disc of the new energy automobile.
Preferably, the mass ratio of the carbon fiber, the silicon nitride fiber and the ethoxy silane group hyperbranched polyborosilazane containing the benzene ring in the step S101 is (40-50): (15-25): (50-60).
Preferably, the carbon fiber is T70012K PANCF carbon fiber, and the length is 12-28 mm.
Preferably, the average diameter of the silicon nitride fiber is 3-9 μm, and the length-diameter ratio is (16-20): 1.
Preferably, the preparation method of the ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings comprises the following steps: adding benzene ring-containing hyperbranched polyborosiloxane, a silane coupling agent KH560 and a basic catalyst into dimethyl sulfoxide, stirring and reacting for 3-5 hours at 90-120 ℃, then precipitating in water, washing the precipitated polymer with ethanol for 3-6 times, and finally drying in a vacuum drying oven at 95-110 ℃ to constant weight to obtain the ethoxysilyl modified benzene ring-containing hyperbranched polyborosilazane.
Preferably, the mass ratio of the hyperbranched polyborosiloxane containing benzene rings to the silane coupling agent KH560 to the basic catalyst to the dimethyl sulfoxide is (3-5) to (0.4-0.6) to (1-2) to (15-25).
Preferably, the source of the hyperbranched polyborosiloxane containing benzene rings is not particularly required, and in one embodiment of the present invention, the hyperbranched polyborosiloxane containing benzene rings is prepared by the method of embodiment 1 in chinese patent 201811195572.4.
Preferably, the alkaline catalyst is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.
Preferably, the drying temperature is 70-80 ℃.
Preferably, the step S102 is performed by a step pressurization and step heating process, specifically: pressing at 95-105 deg.C under 3-4MPa for 0.5-1.5 hr; pressing at the temperature of 125-140 ℃ for 1-2h under 4-5 MPa; pressing for 1-3h at the temperature of 155-195 ℃ under the pressure of 6-10 MPa.
Preferably, the carbonization treatment in step S103 is performed in a muffle furnace, and the carbonization treatment process specifically includes: vacuumizing to less than or equal to 1KPa, and heating; heating to 180-250 ℃ at the heating rate of 20-30 ℃/h, and preserving the heat for 2-4 h; after the heat preservation is finished, the temperature is continuously raised to 1200-1300 ℃ at the temperature rise rate of 10-15 ℃/h, and the heat preservation is carried out for 1-2 h.
Preferably, in step S104, the silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silica powder are prepared by using the silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane, and silica powder in a molar ratio of 2:1 (10-16).
Preferably, the particle size of the silicon powder is 800-1000 meshes.
Preferably, the dipping and curing temperature in the step S104 is 60-80 ℃, the dipping pressure is 4-8 MPa, and the constant temperature time is 2.5-4 hours; the cracking temperature is 950-1200 ℃, and nitrogen is used as inert protective gas during cracking.
Preferably, the heat treatment in step S105 is specifically: vacuumizing the heat treatment furnace to less than or equal to 1KPa, and heating; heating to 1100-1300 deg.c, maintaining for 1-3 hr, cooling to room temperature, and discharging.
The invention also aims to provide the carbon-silicon composite material for the brake disc of the new energy automobile, which is prepared by the preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile.
Detailed Description
The following detailed description of preferred embodiments of the invention will be made.
A preparation method of a carbon-silicon composite material for a brake disc of a new energy automobile is characterized by comprising the following steps:
step S101, prepreg preparation: uniformly mixing carbon fibers, silicon nitride fibers and ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings, and drying to constant weight to obtain a prepreg;
step S102, forming of the brake disc prefabricated product: preparing a prefabricated product of the automobile brake disc by adopting a compression molding process;
step S103, carbonization: carbonizing the brake disc prefabricated product manufactured in the step S102;
step S104, dipping/cracking of the carbon-silicon precursor: silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silicon powder are used as impregnants to carry out impregnation curing and cracking;
step S105, post-processing: and sequentially carrying out heat treatment and finish machining to prepare the finished product of the carbon-silicon composite material for the brake disc of the new energy automobile.
Preferably, the mass ratio of the carbon fiber, the silicon nitride fiber and the ethoxy silane group hyperbranched polyborosilazane containing the benzene ring in the step S101 is (40-50): (15-25): (50-60).
Preferably, the carbon fiber is T70012K PANCF carbon fiber, and the length is 12-28 mm.
Preferably, the average diameter of the silicon nitride fiber is 3-9 μm, and the length-diameter ratio is (16-20): 1.
Preferably, the preparation method of the ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings comprises the following steps: adding benzene ring-containing hyperbranched polyborosiloxane, a silane coupling agent KH560 and a basic catalyst into dimethyl sulfoxide, stirring and reacting for 3-5 hours at 90-120 ℃, then precipitating in water, washing the precipitated polymer with ethanol for 3-6 times, and finally drying in a vacuum drying oven at 95-110 ℃ to constant weight to obtain the ethoxysilyl modified benzene ring-containing hyperbranched polyborosilazane.
Preferably, the mass ratio of the hyperbranched polyborosiloxane containing benzene rings to the silane coupling agent KH560 to the basic catalyst to the dimethyl sulfoxide is (3-5) to (0.4-0.6) to (1-2) to (15-25).
Preferably, the source of the hyperbranched polyborosiloxane containing benzene rings is not particularly required, and in one embodiment of the present invention, the hyperbranched polyborosiloxane containing benzene rings is prepared by the method of embodiment 1 in chinese patent 201811195572.4.
Preferably, the alkaline catalyst is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.
Preferably, the drying temperature is 70-80 ℃.
Preferably, the step S102 is performed by a step pressurization and step heating process, specifically: pressing at 95-105 deg.C under 3-4MPa for 0.5-1.5 hr; pressing at the temperature of 125-140 ℃ for 1-2h under 4-5 MPa; pressing for 1-3h at the temperature of 155-195 ℃ under the pressure of 6-10 MPa.
Preferably, the carbonization treatment in step S103 is performed in a muffle furnace, and the carbonization treatment process specifically includes: vacuumizing to less than or equal to 1KPa, and heating; heating to 180-250 ℃ at the heating rate of 20-30 ℃/h, and preserving the heat for 2-4 h; after the heat preservation is finished, the temperature is continuously raised to 1200-1300 ℃ at the temperature rise rate of 10-15 ℃/h, and the heat preservation is carried out for 1-2 h.
Preferably, in step S104, the silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silica powder are prepared by uniformly stirring the silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane and silica powder in a molar ratio of 2:1 (10-16).
Preferably, the particle size of the silicon powder is 800-1000 meshes.
Preferably, the dipping and curing temperature in the step S104 is 60-80 ℃, the dipping pressure is 4-8 MPa, and the constant temperature time is 2.5-4 hours; the cracking temperature is 950-1200 ℃, and nitrogen is used as inert protective gas during cracking.
Preferably, the heat treatment in step S105 is specifically: vacuumizing the heat treatment furnace to less than or equal to 1KPa, and heating; heating to 1100-1300 deg.c, maintaining for 1-3 hr, cooling to room temperature, and discharging.
The invention also aims to provide the carbon-silicon composite material for the brake disc of the new energy automobile, which is prepared by the preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the carbon-silicon composite material for the new energy automobile brake disc provided by the invention can be prepared by adopting common processes and equipment in the prior art, special equipment is not needed, the capital investment is low, the operation and control are convenient, and the preparation efficiency and the finished product qualification rate are high; through reasonable selection of raw materials for preparing the material, the prepared material has good wear resistance, good durability, high temperature resistance and mechanical properties, and excellent braking performance; the carbon fiber, the silicon nitride fiber and the ethoxy silane group modified hyperbranched polyborosilazane containing the benzene ring are uniformly mixed to prepare the prepreg, the advantages of two fiber materials are combined, the compatibility of various raw materials is improved by adding the ethoxy silane group modified hyperbranched polyborosilazane containing the benzene ring, the high temperature resistance and the wear resistance of the material can be improved by the hyperbranched polyborosilazane structure, and the B element is doped into the material after carbonization, so that the performances can be effectively improved; silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silicon powder are used as impregnants to carry out impregnation curing and cracking; the compatibility between the silicon powder and the carbon material is improved, and the silicon, the carbon and the fluorine are introduced simultaneously, so that the performance and the performance stability of the material can be further improved.
The invention will be further described with reference to specific examples, but the scope of protection of the invention is not limited thereto:
example 1
A preparation method of a carbon-silicon composite material for a brake disc of a new energy automobile is characterized by comprising the following steps:
step S101, prepreg preparation: uniformly mixing carbon fibers, silicon nitride fibers and ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings, and drying to constant weight to obtain a prepreg;
step S102, forming of the brake disc prefabricated product: preparing a prefabricated product of the automobile brake disc by adopting a compression molding process;
step S103, carbonization: carbonizing the brake disc prefabricated product manufactured in the step S102;
step S104, dipping/cracking of the carbon-silicon precursor: silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silicon powder are used as impregnants to carry out impregnation curing and cracking;
step S105, post-processing: and sequentially carrying out heat treatment and finish machining to prepare the finished product of the carbon-silicon composite material for the brake disc of the new energy automobile.
In the step S101, the mass ratio of the carbon fibers, the silicon nitride fibers and the ethoxy silane group containing benzene ring hyperbranched polyborosilazane is 40:15: 50; the carbon fiber is T70012K PANCF carbon fiber, and the length is 12 mm; the silicon nitride fibers have an average diameter of 3 μm and an aspect ratio of 16: 1.
The preparation method of the ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings comprises the following steps: adding benzene ring-containing hyperbranched polyborosiloxane, a silane coupling agent KH560 and a basic catalyst into dimethyl sulfoxide, stirring and reacting for 3 hours at 90 ℃, then precipitating in water, washing the precipitated polymer with ethanol for 3 times, and finally drying in a vacuum drying oven at 95 ℃ to constant weight to obtain the ethoxysilyl modified benzene ring-containing hyperbranched polyborosilazane.
Preferably, the mass ratio of the hyperbranched polyborosiloxane containing benzene rings to the silane coupling agent KH560 to the basic catalyst to the dimethyl sulfoxide is 3:0.4:1: 15.
The hyperbranched polyborosiloxane containing benzene rings is prepared by the method of embodiment 1 in Chinese patent 201811195572.4; the alkaline catalyst is sodium hydroxide; the drying temperature was 70 ℃.
In the step S102, the compression molding is performed by using a step pressurization and step heating process, specifically: pressing at 95 ℃ for 0.5h under 3 MPa; pressing at 125 deg.C for 1h under 4 MPa; pressing at 155 ℃ for 1h under 6 MPa.
In step S103, the carbonization treatment is performed in a muffle furnace, and the carbonization treatment process specifically includes: vacuumizing to less than or equal to 1KPa, and heating; heating to 180 ℃ at a heating rate of 20 ℃/h, and keeping the temperature for 2 h; after the heat preservation is finished, the temperature is continuously raised to 1200 ℃ at the heating rate of 10 ℃/h, and the heat preservation is carried out for 1 h.
In the step S104, the silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silicon powder are prepared by uniformly stirring the silane coupling agent KH560 and the 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane and silicon powder according to the molar ratio of 2:1: 10; the particle size of the silicon powder is 800 meshes.
In the step S104, the temperature of the dipping and curing is 60 ℃, the dipping pressure is 4MPa, and the constant temperature time is 2.5 hours; the cracking temperature is 950 ℃, and nitrogen is used as inert protective gas during cracking.
The heat treatment in step S105 specifically includes: vacuumizing the heat treatment furnace to less than or equal to 1KPa, and heating; heating to 1100 deg.C, holding for 1h, cooling to room temperature, and discharging.
The carbon-silicon composite material for the brake disc of the new energy automobile is prepared according to the preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile.
Example 2
The carbon-silicon composite material for the brake disc of the new energy automobile and the preparation method thereof are basically the same as the embodiment 1, except that the mass ratio of the carbon fiber, the silicon nitride fiber and the ethoxy silane group containing benzene ring hyperbranched polyborosilazane in the step S101 is 42:17: 53; the mass ratio of the hyperbranched polyborosiloxane containing benzene rings to the silane coupling agent KH560 to the basic catalyst to the dimethyl sulfoxide is 3.5:0.45:1.2: 17.
Example 3
The carbon-silicon composite material for the brake disc of the new energy automobile and the preparation method of the carbon-silicon composite material are basically the same as those in the embodiment 1, except that the mass ratio of the carbon fiber, the silicon nitride fiber and the ethoxy silane group containing benzene ring hyperbranched polyborosilazane in the step S101 is 45:20: 55; the mass ratio of the hyperbranched polyborosiloxane containing benzene rings to the silane coupling agent KH560 to the basic catalyst to the dimethyl sulfoxide is 4:0.5:1.5: 20.
Example 4
The carbon-silicon composite material for the brake disc of the new energy automobile and the preparation method thereof are basically the same as the embodiment 1, except that the mass ratio of the carbon fiber, the silicon nitride fiber and the ethoxy silane group containing benzene ring hyperbranched polyborosilazane in the step S101 is 48:23: 58; the mass ratio of the hyperbranched polyborosiloxane containing benzene rings to the silane coupling agent KH560 to the basic catalyst to the dimethyl sulfoxide is 4.5:0.55:1.8: 22.
Example 5
The carbon-silicon composite material for the brake disc of the new energy automobile and the preparation method thereof are basically the same as the embodiment 1, except that the mass ratio of the carbon fiber, the silicon nitride fiber and the ethoxy silane group containing benzene ring hyperbranched polyborosilazane in the step S101 is 50:25: 60; the mass ratio of the hyperbranched polyborosiloxane containing benzene rings to the silane coupling agent KH560 to the basic catalyst to the dimethyl sulfoxide is 5:0.6:2: 25.
Comparative example 1
The carbon-silicon composite material is basically the same as the carbon-silicon composite material in the embodiment 1, except that the ethoxyl silane group-containing hyperbranched polyborosilazane is replaced by phenolic resin.
Comparative example 2
The carbon-silicon composite material is basically the same as that in example 1, except that silicon nitride fibers and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane are not added.
In order to further illustrate the beneficial technical effects of the carbon-silicon composite material for the brake disc of the new energy automobile related to each embodiment, the products prepared in each embodiment are subjected to related performance tests, the test methods refer to the current corresponding national standards in China or the conventional methods in the field, and the test results are shown in table 1. The linear wear rate is tested by adopting an MM-1000 friction tester, and the test conditions are as follows: inertia 3.8kgf cm s2Specific pressure of 100N/cm2The linear velocity was 25 m/s. The braking distance under 100Km/h is the braking distance under the same using condition when the brake disc made of the products of all the examples is applied to an automobile.
TABLE 1
| Test items | Unit of | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 |
| Linear wear rate | Mu m/plane/order | 0.80 | 0.77 | 0.75 | 0.73 | 0.72 | 0.94 | 1.05 |
| Compressive strength | MPa | 448 | 451 | 456 | 459 | 461 | 436 | 415 |
| Braking distance of 100Km/h | MPa | 18.3 | 18.0 | 17.8 | 17.2 | 17.0 | 20.1 | 21.7 |
As can be seen from the above table, the carbon-silicon composite material for a brake disc of a new energy automobile disclosed in the embodiment of the invention has better mechanical properties, wear resistance and braking effect than the comparative example, which is the result of the mutual cooperation and combined action of the raw materials and the steps.
The above-mentioned embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (10)
1. A preparation method of a carbon-silicon composite material for a brake disc of a new energy automobile is characterized by comprising the following steps:
step S101, prepreg preparation: uniformly mixing carbon fibers, silicon nitride fibers and ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings, and drying to constant weight to obtain a prepreg;
step S102, forming of the brake disc prefabricated product: preparing a prefabricated product of the automobile brake disc by adopting a compression molding process;
step S103, carbonization: carbonizing the brake disc prefabricated product manufactured in the step S102;
step S104, dipping/cracking of the carbon-silicon precursor: silane coupling agent KH560 and 2, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silicon powder are used as impregnants to carry out impregnation curing and cracking;
step S105, post-processing: and sequentially carrying out heat treatment and finish machining to prepare the finished product of the carbon-silicon composite material for the brake disc of the new energy automobile.
2. The preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 1, wherein the mass ratio of the carbon fiber, the silicon nitride fiber and the ethoxy silane group containing benzene ring hyperbranched polyborosilazane in the step S101 is (40-50): (15-25): (50-60).
3. The preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 1, wherein the carbon fiber is T70012K PANCF carbon fiber, and the length is 12-28 mm; the average diameter of the silicon nitride fiber is 3-9 μm, and the length-diameter ratio is (16-20): 1.
4. The preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 1, wherein the preparation method of the ethoxy silane group modified hyperbranched polyborosilazane containing benzene rings comprises the following steps: adding benzene ring-containing hyperbranched polyborosiloxane, a silane coupling agent KH560 and a basic catalyst into dimethyl sulfoxide, stirring and reacting for 3-5 hours at 90-120 ℃, then precipitating in water, washing the precipitated polymer with ethanol for 3-6 times, and finally drying in a vacuum drying oven at 95-110 ℃ to constant weight to obtain the ethoxysilyl modified benzene ring-containing hyperbranched polyborosilazane.
5. The preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 4, wherein the mass ratio of the hyperbranched polyborosiloxane containing benzene rings, the silane coupling agent KH560, the basic catalyst and the dimethyl sulfoxide is (3-5): (0.4-0.6): (1-2): (15-25); the hyperbranched polyborosiloxane containing benzene rings is prepared by the method of example 1 in Chinese patent 201811195572.4.
6. The preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 4, wherein the basic catalyst is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.
7. The preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 1, wherein the drying temperature in step S101 is 70-80 ℃; in the step S102, the compression molding is performed by using a step pressurization and step heating process, specifically: pressing at 95-105 deg.C under 3-4MPa for 0.5-1.5 hr; pressing at the temperature of 125-140 ℃ for 1-2h under 4-5 MPa; pressing for 1-3h at the temperature of 155-195 ℃ under the pressure of 6-10 MPa.
8. The preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 1, wherein the carbonization treatment in step S103 is performed in a muffle furnace, and the carbonization treatment process specifically comprises: vacuumizing to less than or equal to 1KPa, and heating; heating to 180-250 ℃ at the heating rate of 20-30 ℃/h, and preserving the heat for 2-4 h; after the heat preservation is finished, the temperature is continuously raised to 1200-1300 ℃ at the temperature rise rate of 10-15 ℃/h, and the heat preservation is carried out for 1-2 h.
9. The method for preparing the carbon-silicon composite material for the brake disc of the new energy automobile according to claim 1, wherein the silane coupling agent KH560, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane co-modified silicon powder in step S104 is prepared by uniformly stirring the silane coupling agent KH560, 2-bis [4- (4-aminophenoxy) phenyl ] -1,1,1,3,3, 3-hexafluoropropane and silicon powder according to a molar ratio of 2:1 (10-16); the particle size of the silicon powder is 800-1000 meshes; in the step S104, the temperature of dipping and curing is 60-80 ℃, the dipping pressure is 4-8 MPa, and the constant temperature time is 2.5-4 hours; the cracking temperature is 950-1200 ℃, and nitrogen is used as inert protective gas during cracking; the heat treatment in step S105 specifically includes: vacuumizing the heat treatment furnace to less than or equal to 1KPa, and heating; heating to 1100-1300 deg.c, maintaining for 1-3 hr, cooling to room temperature, and discharging.
10. The carbon-silicon composite material for the brake disc of the new energy automobile, which is prepared by the preparation method of the carbon-silicon composite material for the brake disc of the new energy automobile according to any one of claims 1 to 9.
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| CN115416377A (en) * | 2022-08-25 | 2022-12-02 | 浙江葆润应用材料有限公司 | Protective material for new energy automobile power battery and preparation method thereof |
| CN115416377B (en) * | 2022-08-25 | 2024-04-30 | 浙江葆润应用材料有限公司 | Protective material for new energy automobile power battery and preparation method thereof |
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