CN111454074A - Carbon-carbon brake disc modified slurry and preparation method of carbon-carbon brake disc - Google Patents
Carbon-carbon brake disc modified slurry and preparation method of carbon-carbon brake disc Download PDFInfo
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- 239000011203 carbon fibre reinforced carbon Substances 0.000 title claims abstract description 47
- 239000002002 slurry Substances 0.000 title claims abstract description 37
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000007613 slurry method Methods 0.000 title description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000003607 modifier Substances 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000000375 suspending agent Substances 0.000 claims abstract description 16
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000008367 deionised water Substances 0.000 claims abstract description 14
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000000280 densification Methods 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract 3
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 230000008021 deposition Effects 0.000 claims description 15
- 238000005470 impregnation Methods 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 7
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 5
- 239000003345 natural gas Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-NJFSPNSNSA-N silicon-30 atom Chemical compound [30Si] XUIMIQQOPSSXEZ-NJFSPNSNSA-N 0.000 claims description 5
- 239000007849 furan resin Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 1
- 230000003068 static effect Effects 0.000 description 8
- 208000009233 Morning Sickness Diseases 0.000 description 2
- 208000034850 Vomiting in pregnancy Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-AKLPVKDBSA-N silicon-31 atom Chemical compound [31Si] XUIMIQQOPSSXEZ-AKLPVKDBSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/83—Carbon fibres in a carbon matrix
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3821—Boron carbides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/46—Gases other than oxygen used as reactant, e.g. nitrogen used to make a nitride phase
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a carbon-carbon brake disc modified slurry and a preparation method of the carbon-carbon brake disc, wherein the modified slurry consists of a modifier, a suspending agent and deionized water, wherein the modifier consists of graphite powder and B4The carbon powder consists of C powder, silicon carbide powder and carbon powder, and the mass percentages are respectively as follows: 10-15%: 20-35%: 25-35%: 30-40%. Mixing the modified slurry prepared in the step with resin according to the mass percentage of (20-30%) to (70-80%) to prepare an impregnant, impregnating the prepared impregnant into a C/C brake disc preform by using a vacuum pressurization process, curing the brake disc preform, performing CVD densification treatment on the cured brake disc preform, and finally performing high-temperature heat treatment to obtain a carbon-carbon brake disc finished productAll the comprehensive properties are improved effectively, and the brake disc can be widely applied to the field of brake disc production and manufacturing.
Description
Technical Field
The invention relates to the field of brake disc preparation processes, in particular to carbon-carbon brake disc modified slurry and a preparation method of a carbon-carbon brake disc.
Background
The C/C composite material has the outstanding advantages of high specific strength, high specific modulus, low density, excellent heat conductivity, high bearing capacity, long service life and the like, and currently occupies the absolute leading position of the aircraft brake market. However, with the expansion of the application scale, the C/C brake disc is found to have certain defects, which are shown in the following aspects:
(1) the static friction coefficient is lower and is only 0.12-0.18. In order to meet the requirement of the static brake of the flying lead, a set of high-pressure static brake system of about 20MPa is required to be added on the basis of 7-10 MPa of normal brake of the airplane, the structure of the airplane brake system is more complex, and the reliability and the safety of the airplane brake are influenced to a certain extent.
(2) When braking, the brake torque has the phenomenon of forward rush and the shake, and the braking efficiency is low.
(3) The wet braking performance is poor, which is particularly characterized in that the braking torque is low when the vehicle brakes for the first time in the morning or brakes in rainy days, and the condition is generally called 'morning sickness'.
(4) The brake temperature is higher, the landing temperature is 500-800 ℃ normally, and the takeoff is stopped even at the temperature of over 1200 ℃.
In order to solve the above problems, it is necessary to develop a carbon brake disc having excellent properties.
Disclosure of Invention
The invention aims to provide a carbon-carbon brake disc modified slurry and a preparation method of a carbon-carbon brake disc, and solves the problems of low static friction coefficient, poor wet braking performance, high braking temperature and the like of the conventional carbon-carbon brake disc.
The technical scheme adopted by the invention for solving the technical problems is as follows: preparing modified slurry, mixing the modified slurry with resin to prepare an impregnant, impregnating the prepared impregnant into a C/C brake disc preform by using a vacuum pressurization process, curing the brake disc preform, performing CVI (chemical vapor infiltration) densification treatment on the cured brake disc preform, and finally performing high-temperature heat treatment to obtain a finished carbon brake disc.
The modified slurry consists of a modifier, a suspending agent and deionized water, and the mass percentages are respectively as follows: 7-10%, 1-2% and 80-90%. Wherein the modifier comprises 10-15% by mass of graphite powder and 20-35% by mass of B4The carbon powder comprises 25-35% of silicon carbide powder and 30-40% of carbon powder by mass percent. Mixing the modified slurry prepared in the steps with resin according to the mass percentage of (20-30%) to (70-80%) to prepare an impregnant, and performing a vacuum pressurization process on the prepared impregnantImpregnating the impregnant into the C/C brake disc preform, curing the brake disc preform, performing CVI densification treatment on the cured brake disc preform, and finally performing high-temperature heat treatment to obtain a carbon-carbon brake disc finished product.
Preferably, the graphite powder and B4The particle sizes of the C powder, the silicon carbide powder and the carbon powder are all 1-5 mu m.
Preferably, the graphite powder and B4The preferable mass percentages of the C powder, the silicon carbide powder and the carbon powder are respectively as follows: 13%: 28%: 27%: 32 percent.
A preparation method of a carbon brake disc comprises the following steps:
1) preparing slurry, namely preparing 10-15 mass percent of graphite powder and 20-35 mass percent of B4Mixing the powder C, 25-35% by mass of silicon carbide powder and 30-40% by mass of carbon powder to obtain a modifier; adding a modifier into deionized water to prepare modified slurry, and adding sodium carboxymethylcellulose as a slurry suspending agent; wherein the mass percent of the modifier is 7-10%, the mass percent of the suspending agent is 1-2%, and the mass percent of the deionized water is 80-90%;
2) impregnating the brake disc preform, namely mixing the modified slurry obtained in the step 1) with resin according to the mass percentage (20-30%) to (70-80%) to prepare an impregnant; then impregnating the impregnant into the C/C brake disc prefabricated body by using a vacuum pressurization process, wherein the impregnation pressure is 0.4-0.6 MPa, and the impregnation time is 40-60 min;
3) curing the brake disc preform, and putting the brake disc preform into a curing furnace to be cured for 1.75-2.25 hours at the temperature of 180-190 ℃;
4) CVD densification treatment, the process conditions are as follows: taking natural gas as a carbon source gas, wherein the deposition temperature is 1000-1050 ℃, the deposition pressure is 1-4 kPa, and the deposition time is 300-500 h;
5) and (3) high-temperature heat treatment, namely, sending the brake disc preform subjected to the CVI densification treatment into a high-temperature heat treatment furnace for high-temperature heat treatment at 2100-2200 ℃ for 0.75-1.25 h to obtain a finished product of the carbon-carbon brake disc.
The invention has the beneficial effects that: the carbon/carbon brake disc processed by the carbon/carbon brake disc modified slurry and the method can effectively improve the static friction coefficient of the carbon/carbon brake disc; meanwhile, the problems of the phenomenon that the braking torque has a forward stroke, the brake shaking and the low braking efficiency in the braking process can be solved. The heat dissipation performance of the brake disc can be improved, and the wet braking performance is improved. The addition of the graphite powder enables the friction torque of the C/C brake disc to be more stable and smooth; the addition of B4C powder greatly improves the specific heat of the C/C brake disc, increases the heat capacity of the heat reservoir of the brake disc, is very favorable for reducing the braking temperature, and can powerfully reduce the volume of the heat reservoir at the same temperature. The SiC powder improves the static friction performance and the wet friction performance of the C/C brake disc. Therefore, the brake disc obtained by the invention has improved comprehensive performance.
The present invention will be described in more detail with reference to the following examples.
Detailed Description
Example 1: the carbon brake disc modified slurry comprises 7-10% by mass of a modifier, 1-2% by mass of a suspending agent and 80-90% by mass of deionized water, and is prepared by mixing. The suspending agent is sodium carboxymethyl cellulose. The modifier comprises 10-15% of graphite powder and 20-35% of B4The carbon powder comprises 25-35% of silicon carbide powder and 30-40% of carbon powder by mass percent. The graphite powder and B4The particle sizes of the C powder, the silicon carbide powder and the carbon powder are all 1-5 mu m.
Example 2: a preparation method of a carbon brake disc comprises the following steps:
1) preparing slurry, namely preparing 11 mass percent of graphite powder and 30 mass percent of B4Mixing the powder C, 26% of silicon carbide powder by mass and 33% of carbon powder by mass to obtain a modifier; adding a modifier into deionized water to prepare modified slurry, and adding sodium carboxymethylcellulose as a slurry suspending agent; wherein, the mass percent of the modifier is 8.9%, the mass percent of the suspending agent is 1.7%, and the mass percent of the deionized water isThe ratio was 89.4%;
2) impregnating the brake disc preform, namely mixing the modified slurry obtained in the step 1) with furan resin or phenolic resin according to the mass percentage of 23% to 77% to prepare an impregnant; then impregnating the impregnant into the C/C brake disc prefabricated body by utilizing a vacuum pressurization process, wherein the impregnation pressure is 0.5MPa, and the impregnation time is 50 min;
3) curing the brake disc preform, and putting the brake disc preform into a curing furnace to be cured for 2 hours at 185 ℃;
4) CVD densification treatment, the process conditions are as follows: taking natural gas as a carbon source gas, wherein the deposition temperature is 1000-1050 ℃, the deposition pressure is 3kPa, and the deposition time is 300-500 h;
5) and (3) high-temperature heat treatment, namely, sending the brake disc preform subjected to the CVI densification treatment into a high-temperature heat treatment furnace for high-temperature heat treatment at 2100-2200 ℃ for 0.75-1.25 h to obtain a finished product of the carbon-carbon brake disc.
Example 3: a preparation method of a carbon brake disc comprises the following steps:
1) preparing slurry, namely preparing 13 mass percent of graphite powder and 28 mass percent of B4Mixing the powder C, 27% of silicon carbide powder by mass and 32% of carbon powder by mass to obtain a modifier; adding a modifier into deionized water to prepare modified slurry, and adding sodium carboxymethylcellulose as a slurry suspending agent; wherein, the mass percent of the modifier is 9.5%, the mass percent of the suspending agent is 1.5%, and the mass percent of the deionized water is 89%;
2) impregnating the brake disc preform, and mixing the modified slurry obtained in the step 1) with furan resin according to the mass percentage of 25% to 75% to prepare an impregnant; then impregnating the impregnant into the C/C brake disc prefabricated body by using a vacuum pressurization process, wherein the impregnation pressure is 0.4-0.6 MPa, and the impregnation time is 40-60 min;
3) curing the brake disc preform, and putting the brake disc preform into a curing furnace to be cured for 1.75-2.25 hours at the temperature of 180-190 ℃;
4) CVD densification treatment, the process conditions are as follows: taking natural gas as a carbon source gas, wherein the deposition temperature is 1000-1050 ℃, the deposition pressure is 1-4 kPa, and the deposition time is 300-500 h;
5) and (3) high-temperature heat treatment, namely, sending the brake disc preform subjected to the CVI densification treatment into a high-temperature heat treatment furnace for high-temperature heat treatment at 2100-2200 ℃ for 0.75-1.25 h to obtain a finished product of the carbon-carbon brake disc.
Example 4: a preparation method of a carbon brake disc comprises the following steps:
1) preparing slurry, namely preparing 15 mass percent of graphite powder and 26 mass percent of B4Mixing the powder C, 28 mass percent of silicon carbide powder and 31 mass percent of carbon powder to obtain a modifier; adding a modifier into deionized water to prepare modified slurry, and adding sodium carboxymethylcellulose as a slurry suspending agent; wherein, the mass percent of the modifier is 10%, the mass percent of the suspending agent is 2%, and the mass percent of the deionized water is 88%;
2) impregnating the brake disc preform, and mixing the modified slurry obtained in the step 1) with furan resin according to the mass percentage of 28% to 72% to prepare an impregnant; then impregnating the impregnant into the C/C brake disc prefabricated body by using a vacuum pressurization process, wherein the impregnation pressure is 0.4-0.6 MPa, and the impregnation time is 40-60 min;
3) curing the brake disc preform, and putting the brake disc preform into a curing furnace to be cured for 1.75-2.25 hours at the temperature of 180-190 ℃;
4) CVD densification treatment, the process conditions are as follows: taking natural gas as a carbon source gas, wherein the deposition temperature is 1000-1050 ℃, the deposition pressure is 1-4 kPa, and the deposition time is 300-500 h;
5) and (3) high-temperature heat treatment, namely, sending the brake disc preform subjected to the CVI densification treatment into a high-temperature heat treatment furnace for high-temperature heat treatment at 2100-2200 ℃ for 0.75-1.25 h to obtain a finished product of the carbon-carbon brake disc.
Example 5: and (5) comparing the performance and checking and verifying.
The performance of the C/C brake disc prepared by the slurry dipping process is compared with the performance of the C/C brake disc not prepared by the process to verify the feasibility and the superiority of the C/C brake disc, and the braking performance comparison of the C/C brake disc prepared by the process and the C/C brake disc not prepared by the process can be analyzed from the table as shown in the table 1.
TABLE 1 comparative analysis Table of properties
From the above table, the following points can be seen: 1) the wet performance of the C/C brake disc prepared by the patent process is obviously improved, and the problem of 'morning sickness' can be effectively solved. The C/C brake disc which is not prepared by the patented process has poor wet braking performance, the attenuation amplitude reaches 40 percent, and the deceleration rate is only 2.1m/s2. The wet attenuation amplitude of the C/C brake disc prepared by the patented process is only 15-20%, and the deceleration rate reaches 3.4-3.6 m/s2
2) The C/C brake disc prepared by the process has obviously improved static braking performance, the static friction coefficient is improved to 0.20-0.22 from 0.17, and the matching of a braking system is facilitated.
3) The volume temperature of the brake body of the C/C brake disc prepared by the process is obviously reduced, and the problem of high brake temperature can be effectively solved. The braking temperature of the C/C brake disc prepared by the patent process for normal landing is 500-520 ℃, and is 180-200 ℃ lower than that of the C/C brake disc prepared by the patent process.
The invention is described above by way of example with reference to the accompanying table. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.
Claims (6)
1. The carbon brake disc modified slurry is characterized in that: the water-based paint comprises 7-10% by mass of a modifier, 1-2% by mass of a suspending agent and 80-90% by mass of deionized water;
the modifier comprises 10-15% of graphite powder and 20-35% of B4The carbon powder comprises 25-35% of silicon carbide powder and 30-40% of carbon powder by mass percent.
2. The carbon-carbon brake disc modified slurry of claim 1, wherein: the suspending agent is sodium carboxymethyl cellulose.
3. The carbon-carbon brake disc modified slurry of claim 1, wherein: the graphite powder and B4The mass percentages of the C powder, the silicon carbide powder and the carbon powder are respectively as follows: 13%: 28%: 27%: 32 percent.
4. The carbon-carbon brake disc modifier of claim 1, wherein: the graphite powder and B4The particle sizes of the C powder, the silicon carbide powder and the carbon powder are all 1-5 mu m.
5. A preparation method of a carbon-carbon brake disc is characterized by comprising the following steps: the method comprises the following steps:
1) preparing slurry, namely preparing 10-15 mass percent of graphite powder and 20-35 mass percent of B4Mixing the powder C, 25-35% by mass of silicon carbide powder and 30-40% by mass of carbon powder to obtain a modifier; adding a modifier into deionized water to prepare modified slurry, and adding sodium carboxymethylcellulose as a slurry suspending agent; wherein the mass percent of the modifier is 7-10%, the mass percent of the suspending agent is 1-2%, and the mass percent of the deionized water is 80-90%;
2) impregnating the brake disc preform, namely mixing the modified slurry obtained in the step 1) with resin according to the mass percentage (20-30%) to (70-80%) to prepare an impregnant; then impregnating the impregnant into the C/C brake disc prefabricated body by using a vacuum pressurization process, wherein the impregnation pressure is 0.4-0.6 MPa, and the impregnation time is 40-60 min;
3) curing the brake disc preform, and putting the brake disc preform into a curing furnace to be cured for 1.75-2.25 hours at the temperature of 180-190 ℃;
4) CVD densification treatment, the process conditions are as follows: taking natural gas as a carbon source gas, wherein the deposition temperature is 1000-1050 ℃, the deposition pressure is 1-4 kPa, and the deposition time is 300-500 h;
5) and (3) high-temperature heat treatment, namely, sending the brake disc preform subjected to the CVI densification treatment into a high-temperature heat treatment furnace for high-temperature heat treatment at 2100-2200 ℃ for 0.75-1.25 h to obtain a finished product of the carbon-carbon brake disc.
6. The process for preparing a modifier according to claim 5, wherein: the resin in the step 2) is furan resin or phenolic resin.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010268377.0A CN111454074A (en) | 2020-04-08 | 2020-04-08 | Carbon-carbon brake disc modified slurry and preparation method of carbon-carbon brake disc |
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| CN202010268377.0A CN111454074A (en) | 2020-04-08 | 2020-04-08 | Carbon-carbon brake disc modified slurry and preparation method of carbon-carbon brake disc |
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| CN106507879B (en) * | 2010-01-08 | 2012-07-18 | 西北工业大学 | A kind of manufacture method of the modified carbon/carbon aircraft finance lease of ceramics |
| CN106478125A (en) * | 2016-09-28 | 2017-03-08 | 西北工业大学 | A kind of B4The preparation method of C modification C/C SiC brake material |
| CN109231993A (en) * | 2018-09-28 | 2019-01-18 | 湖南中南智造新材料协同创新有限公司 | One kind enhancing ceramic matrix friction material of high-strength carbon fiber containing self-lubricating phase and preparation method thereof |
| CN109251052A (en) * | 2018-11-08 | 2019-01-22 | 中南大学 | A kind of C/C composite material and preparation method |
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| CN106507879B (en) * | 2010-01-08 | 2012-07-18 | 西北工业大学 | A kind of manufacture method of the modified carbon/carbon aircraft finance lease of ceramics |
| CN106478125A (en) * | 2016-09-28 | 2017-03-08 | 西北工业大学 | A kind of B4The preparation method of C modification C/C SiC brake material |
| CN109231993A (en) * | 2018-09-28 | 2019-01-18 | 湖南中南智造新材料协同创新有限公司 | One kind enhancing ceramic matrix friction material of high-strength carbon fiber containing self-lubricating phase and preparation method thereof |
| CN109251052A (en) * | 2018-11-08 | 2019-01-22 | 中南大学 | A kind of C/C composite material and preparation method |
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