CN111892416A - Preparation method of carbon-ceramic brake disc - Google Patents
Preparation method of carbon-ceramic brake disc Download PDFInfo
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- CN111892416A CN111892416A CN202010729737.2A CN202010729737A CN111892416A CN 111892416 A CN111892416 A CN 111892416A CN 202010729737 A CN202010729737 A CN 202010729737A CN 111892416 A CN111892416 A CN 111892416A
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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
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
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Abstract
The invention provides a preparation method of a carbon-ceramic brake material. The method comprises the steps of placing a low-density carbon/carbon blank into silicon powder dipping slurry, drying after dipping, then placing the silicon powder dipped carbon/carbon blank into a silicification furnace, and carrying out in-situ melting chemical reaction on the silicon powder in the carbon blank and deposited carbon on the surface of the blank at a high temperature to form a SiC ceramic phase. The method does not need to use a tool crucible in the melting siliconizing process, thereby saving the furnace loading space and the siliconizing raw materials. The method has the advantages of simple process, convenient implementation, easy control and adjustment of the siliconizing amount, good dispersivity and uniformity of the formed ceramic phase, low content of residual silicon and stable performance.
Description
Technical Field
The invention relates to the technical field of brake materials, in particular to a preparation method of a carbon-ceramic brake disc.
Background
The disc brake is the most commonly used brake at present, and the brake disc is the core component of the disc brake system, and the performance of the disc brake determines the braking safety and driving comfort of the vehicle. The carbon ceramic brake material is a high-performance brake material developed after powder metallurgy brake materials and C/C friction materials in recent years. The material not only has the advantages of high strength, high impact resistance, good heat conductivity and toughness of the existing friction material, but also has the advantages of low density, high use temperature and low abrasion, and is known as the next generation ideal brake material.
The carbon-ceramic brake disc is prepared by preparing a low-density carbon/carbon blank by a constant-temperature CVD process, burying the carbon/carbon blank into a crucible filled with silicon powder, putting the crucible into a silicification furnace, and carrying out a chemical reaction by melting and siliconizing under a high-temperature condition so as to form a SiC ceramic phase in the carbon/carbon blank. The existing preparation process has the advantages of small furnace charge and low production efficiency; the crucible and the silicon powder are in large demand, so that the silicon powder and the crucible are wasted greatly, and the cost is high.
20110030568.4 (patent 1) discloses a method for manufacturing a carbon-ceramic brake disc, which comprises preparing a low-density carbon/carbon blank by constant temperature CVD, burying the carbon/carbon blank in a graphite crucible containing silicon powder, placing the graphite crucible in a siliconizing furnace, and carrying out a melting siliconizing chemical reaction at a high temperature to form a ceramic-phase aircraft brake disc in the carbon/carbon blank. Because the molten siliconizing needs to load the carbon blank into the graphite crucible (the process is shown in figure 2), the charging amount of the carbon blank is small, and the production efficiency is low; and the silicon powder is melted at high temperature and permeates from the surface of the blank body along the thickness direction, and the silicon carbide ceramic phase is generated by the reaction of the molten silicon and deposited carbon in the pore channels of the blank body in the permeating process, so that the uniformity of the siliconizing cannot be ensured.
The prior art 201910694494.X (hereinafter referred to as patent 2) discloses a preparation method of a carbon-ceramic airplane brake disc, wherein the density of the carbon-ceramic airplane brake disc is 1.0-1.5 g/cm3The C/C composite material is a blank, and the density of the blank is 2.0-22 g/cm after PIP treatment, high-temperature treatment and RMI treatment3The carbon-ceramic composite material is soaked in silicon melt adhesive for multiple times under vacuum, dried until the weight gain rate of the carbon-ceramic composite material is 1.0-1.4%, and then subjected to heat treatment to obtain the carbon-ceramic brake disc. The RMI treatment process comprises the steps of placing a blank body subjected to high-temperature treatment in a graphite mold paved with silicon powder and amorphous silicon carbide powder, and carrying out siliconizing reaction under the vacuum condition. The preparation method has the advantages of complex process, repeated silicon soaking and long production period. In particular, the amorphous silicon carbide powder has high preparation cost, and the RMI treatment process is the same as that of patent 1Meanwhile, a graphite mold (crucible) is still needed, the charging amount of the brake disc is small, and the production efficiency is low.
The prior art CN105565839B (hereinafter referred to as patent 3) discloses a preparation method of a carbon-ceramic brake material, which comprises the steps of impregnating a carbon fiber preform with a slurry mixture of phenolic resin and ceramic powder, then carrying out hot-pressing curing to crack the phenolic resin to form a resin-carbon matrix, and finally mixing the resin-carbon matrix with the ceramic powder to prepare the carbon-ceramic brake material. The material has poor thermodynamic property, low matrix strength, and easy cracking, slag falling and large abrasion in use. And the graphitization degree is difficult to improve, and the use requirement of the airplane on large energy load is difficult to meet.
The prior art shows that the existing preparation method of the carbon-ceramic brake material has the advantages of small charging amount and low production efficiency in the siliconizing process. And the requirement for the crucible and the silicon powder is large, so that the silicon powder and the crucible are wasted greatly, and the production cost is increased.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a preparation method of a carbon-ceramic brake disc.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to a preparation method of a carbon-ceramic brake disc, which comprises the following steps:
1) preparing a carbon fiber preform blank according to the actual specification requirement of the carbon ceramic brake disc, and then carrying out first vacuum heat treatment on the blank;
preferably, the first vacuum heat treatment temperature is 1500-1700 ℃, and the time is 2-4 h.
2) Placing the carbon fiber preform blank subjected to the first vacuum heat treatment in a Chemical Vapor Deposition (CVD) furnace for vapor deposition until the density of the carbon fiber preform blank reaches 1.30-1.55 g/cm3Obtaining a low-density carbon/carbon blank;
preferably, the chemical vapor deposition takes natural gas, methane or propane as reaction gas, the deposition pressure is 1-3 KPa, the deposition temperature is 800-950 ℃, and the deposition time is 200-350 h.
3) Sequentially carrying out second vacuum heat treatment and machining on the low-density carbon/carbon blank;
preferably, the machining comprises the steps of turning inner and outer circles, milling mounting hole positions, drilling heat dissipation holes and the like, and 0.2mm is reserved on one side of the friction surface of the brake disc in the thickness direction for grinding.
Preferably, the temperature of the second vacuum heat treatment is 1800-1900 ℃, and the time is 3-6 h.
4) Placing the machined low-density carbon/carbon blank into silicon powder dipping slurry, and drying after dipping to obtain silicon powder dipped carbon/carbon blank with the density of 1.80-1.95 g/cm3；
Preferably, the silicon powder impregnation slurry is obtained by mixing silicon powder, a dispersing agent and a solvent and then performing ball milling.
Preferably, the dispersant is polyethyleneimine, the solvent is a mixed solvent of ethanol and acetone, and the volume ratio of the ethanol to the acetone is 1: 1.
Preferably, the solid content of the silicon powder in the silicon powder dipping slurry is 20-30%, and the mass fraction of the dispersing agent is 3-7%; the mass fraction of the solvent is 63-77%.
Preferably, in the step 4), the machined low-density carbon/carbon blank is placed in a vacuum impregnation tank, vacuum pumping is carried out until the pressure in the tank reaches below 1000Pa, then the silicon powder impregnation slurry is pressed into the impregnation tank under the action of atmospheric pressure, and the low-density carbon/carbon blank is immersed; and then applying 1-2 MPa of air pressure to the slurry in the impregnation tank, maintaining the pressure, releasing the pressure, taking out the low-density carbon/carbon blank body soaked with the silicon powder, and then placing the low-density carbon/carbon blank body soaked with the silicon powder in an oven for drying to obtain the carbon/carbon blank body soaked with the silicon powder.
5) And (3) loading a plurality of carbon/carbon blanks impregnated by the silicon powder into a silicification furnace, separating adjacent blanks by using backing rings, and sintering to obtain the carbon-ceramic brake disc.
Preferably, the backing ring is a graphite backing ring, and the thickness of the backing ring is 2-2.5 mm.
Preferably, the sintering procedure comprises: heating to 1450 ℃ at the speed of 3-5 ℃/min, preserving heat for 8-12 min, and then naturally cooling to below 150 ℃ for discharging; and the vacuum degree in the sintering process is 100-500 Pa.
Preferably, after sintering is finished, the surface of the carbon/ceramic brake material discharged from the furnace is cleaned, and the friction surface is ground to meet the requirements of thickness and flatness required by a drawing.
The invention has the beneficial effects that:
the existing carbon-ceramic brake disc is generally prepared into a low-density carbon/carbon blank by adopting a constant-temperature CVD process, then the carbon/carbon blank is buried into a crucible filled with silicon powder, and then the carbon/carbon blank is placed into a silicification furnace to carry out a melting siliconizing chemical reaction under a high-temperature condition, so that a SiC ceramic phase is formed in the carbon/carbon blank. The process has the advantages of small charging amount, low production efficiency and large demand on the crucible and the silicon powder when the melting siliconizing is carried out, thereby causing large waste of the silicon powder and the crucible and improving the production cost.
Aiming at the problems, the invention provides a preparation method of a carbon-ceramic brake material. The method comprises the steps of placing a low-density carbon/carbon blank into silicon powder dipping slurry, drying after dipping, then placing the silicon powder dipped carbon/carbon blank into a silicification furnace, and carrying out in-situ melting chemical reaction on the silicon powder in the carbon blank and deposited carbon on the surface of the blank at a high temperature to form a SiC ceramic phase. The method does not need to use a tool crucible in the melting siliconizing process, thereby saving the furnace loading space and the siliconizing raw materials. The method has the advantages of simple process, convenient implementation, easy control and adjustment of the siliconizing amount, good dispersivity and uniformity of the formed ceramic phase, low content of residual silicon and stable performance.
Drawings
FIG. 1 is a schematic view of charging a carbon/carbon blank impregnated with silicon powder in the siliconizing step according to the invention;
wherein, 1-1 siliconizing treatment furnace; 1-2 carbon/carbon bodies; 1-3 graphite backing rings;
FIG. 2 is a schematic view of charging a carbon/carbon body in a prior art molten siliconizing treatment step;
wherein, 2-1 siliconizing treatment furnace; 2-2 carbon/carbon bodies; 2-3 graphite crucible.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The embodiment of the invention relates to a preparation method of a carbon-ceramic brake disc, which comprises the following steps:
1) preparing a carbon fiber preform blank according to the actual specification requirement of the carbon ceramic brake disc, and then carrying out first vacuum heat treatment on the blank;
in one embodiment of the present invention, a carbon fiber preform blank may be obtained by cutting a carbon felt. The first vacuum heat treatment temperature is 1500-1700 ℃, the time is 2-4 h, and the pressure is below 1000 Pa. The purpose of the first vacuum heat treatment is to remove impurities from the surface of the blank.
2) Placing the carbon fiber preform blank subjected to the first vacuum heat treatment in a Chemical Vapor Deposition (CVD) furnace for vapor deposition until the density of the carbon fiber preform blank reaches 1.30-1.55 g/cm3Obtaining a low-density carbon/carbon blank;
in one embodiment of the present invention, the chemical vapor deposition uses natural gas, methane or propane as a reaction gas, the deposition pressure is 1 to 3KPa, the deposition temperature is 800 to 950 ℃, and the deposition time is 200 to 350 hours. The purpose of chemical vapor deposition is to form amorphous carbon on the surface of the ingot.
3) Carrying out second vacuum heat treatment on the low-density carbon/carbon blank, and finishing machining according to the drawing requirements of brake disc parts after discharging;
in one embodiment of the present invention, the temperature of the second vacuum heat treatment is 1800-1900 ℃ for 3-6 hours. The purpose of the second vacuum heat treatment is to increase the graphitization degree of the carbon/carbon body while removing surface impurities.
In one embodiment of the invention, the machining comprises the steps of turning inner and outer circles, milling mounting hole positions, drilling heat dissipation holes and the like, and 0.2mm of single surface in the thickness direction of the friction surface of the brake disc is reserved for grinding.
4) Placing the machined low-density carbon/carbon blank into silicon powder dipping slurry, and drying after dipping to obtain silicon powder dipped carbon/carbon blank with the density of 1.80-1.95 g/cm3；
Further, the silicon powder impregnation slurry is obtained by mixing silicon powder, a dispersing agent and a solvent and then performing ball milling.
In one embodiment of the invention, the particle size of the silicon powder is 100-400 meshes, and the purity is more than or equal to 99%; the dispersant is polyethyleneimine (PEI, weight average molecular weight M)W10000); the solvent is a mixed solvent of ethanol and acetone, and the volume ratio of the ethanol to the acetone is 1: 1.
In the silicon powder dipping slurry, the solid content of the silicon powder is 20-30%, and the mass fraction of the dispersing agent is 3-7%; the mass fraction of the solvent is 63-77%.
In one embodiment of the present invention, the silicon powder impregnation process is as follows: placing the machined low-density carbon/carbon blank into a vacuum impregnation tank, vacuumizing until the pressure in the tank reaches below 1000Pa, pressing the silicon powder impregnation slurry into the impregnation tank under the action of atmospheric pressure, and immersing the low-density carbon/carbon blank; and then applying 1-2 MPa of air pressure to the slurry in the impregnation tank, maintaining the pressure, releasing the pressure, taking out the low-density carbon/carbon blank body soaked with the silicon powder, and then placing the low-density carbon/carbon blank body soaked with the silicon powder in an oven for drying to obtain the carbon/carbon blank body soaked with the silicon powder.
5) And (3) loading a plurality of carbon/carbon blanks impregnated with silicon powder into a silicification furnace, separating adjacent blanks by using a backing ring, and sintering to obtain the carbon-ceramic brake disc.
In one embodiment of the invention, the sintering procedure comprises: heating to 1450 ℃ at the speed of 3-5 ℃/min, preserving heat for 8-12 min, and then naturally cooling to below 150 ℃ for discharging; the vacuum degree in the sintering process is 100-500 Pa.
In one embodiment of the invention, the backing ring functions to space the carbon/carbon bodies apart and prevent sticking of the carbon/carbon bodies in contact. The reason why the graphite backing ring is preferably adopted is that the graphite has stable chemical properties, high temperature resistance and low cost, and high temperature resistant ceramics can also be adopted as the material of the backing ring. Under the condition of a certain volume of the siliconizing furnace, the thinner the thickness of the backing ring is, the better the backing ring is, in order to load more carbon/carbon blanks. However, when the thickness of the graphite backing ring is less than 2mm, the processing difficulty is high, so that the thickness of the graphite backing ring selected by the invention is 2-2.5 mm.
In one embodiment of the invention, after sintering is completed, the carbon/ceramic brake material after being discharged from the furnace is subjected to surface cleaning, and the friction surface is ground to meet the requirements of thickness and flatness required by a drawing.
Example 1
A preparation method of a carbon-ceramic brake disc comprises the following steps:
1) cutting a carbon felt to obtain a carbon fiber preform blank according to the actual specification requirement of the carbon ceramic brake disc, and then carrying out first vacuum heat treatment on the blank. The first vacuum heat treatment temperature is 1600 ℃, the time is 3h, and the pressure is below 1000 Pa.
2) And (3) placing the carbon fiber preform blank subjected to the first vacuum heat treatment in a CVD furnace for vapor deposition, wherein methane is used as reaction gas, the deposition pressure is 2KPa, the deposition temperature is 850 ℃, and the deposition time is 250 h. Until the density of the carbon fiber preform blank reaches 1.30-1.55 g/cm3Obtaining a low-density carbon/carbon blank;
3) carrying out second vacuum heat treatment on the low-density carbon/carbon blank at 1800 ℃ for 4 hours, and finishing machining according to the drawing requirements of brake disc parts after discharging;
4) placing the machined low-density carbon/carbon blank into silicon powder dipping slurry, and drying after dipping to obtain silicon powder dipped carbon/carbon blank with the density of 1.80-1.95 g/cm3。
The silicon powder dipping slurry is obtained by mixing silicon powder, a dispersing agent and a solvent and then performing ball milling. The granularity of the silicon powder is 100-400 meshes, and the purity is more than or equal to 99 percent; the dispersant is polyethyleneimine (PEI, weight average molecular weight M)W10000); the solvent is a mixed solvent of ethanol and acetone, and the volume ratio of the ethanol to the acetone is 1: 1. The solid content of the silicon powder in the silicon powder dipping slurry is 25%, and the mass fraction of the dispersing agent is 5%.
5) And (3) loading a plurality of carbon/carbon blanks impregnated with silicon powder into a silicification furnace, separating adjacent blanks by using a graphite backing ring, and sintering to obtain the carbon-ceramic brake disc. FIG. 1 is a schematic diagram of a carbon/carbon blank 1-2 obtained by loading silicon powder into a siliconizing furnace 1-1 and immersing the carbon/carbon blank in the silicon powder according to an embodiment, wherein a plurality of carbon/carbon blanks 1-2 are stacked in a vertical direction, and every two adjacent carbon/carbon blanks 1-2 are isolated by a graphite backing ring 1-3 with a thickness of 2-2.5 mm.
The sintering procedure included: raising the temperature to 1450 ℃ at the speed of 4 ℃/min, preserving the temperature for 10min, then naturally cooling to below 150 ℃, discharging, and ensuring the vacuum degree to be 100-500 Pa in the sintering process.
Comparative example
Steps 1) to 4) are the same as in the examples. And 5) firstly, filling the carbon/carbon blank impregnated with the silicon powder into graphite crucibles paved with the silicon powder, and filling one crucible into one carbon/carbon blank. Then, a plurality of graphite crucibles filled with carbon/carbon bodies are loaded into a siliconizing furnace and stacked in the vertical direction. Sintering is carried out according to the sintering procedure in the step 5) of the embodiment to obtain the carbon-ceramic brake disc.
FIG. 2 is a schematic view of charging a carbon/carbon blank in the prior art of melt siliconizing. In the siliconizing furnace 2-1, the carbon/carbon bodies 2-2 are isolated by a graphite crucible 2-3.
Mechanical property tests were performed on the carbon-ceramic brake discs prepared in example 1 and the comparative example, and the results are shown in table 1.
TABLE 1
Table 1 shows that the carbon-ceramic brake disc prepared in example 1 has better mechanical properties and frictional wear properties than the brake disc sintered by charging in the prior art, and especially has a wear rate much lower than that of the prior art, thereby greatly improving the service life of the carbon-ceramic brake disc.
In addition, the specific gravity is the density and standard atmospheric pressure of the substance, and pure water at 3.98 deg.CDensity (999.972 kg/m)3) The ratio of (a) to (b). At present, no data of reaction siliconizing uniformity exists, and the siliconizing amount is judged according to specific gravity. The specific gravity of example 1 is higher than that of the comparative example, showing that the amount and uniformity of siliconizing are superior to those of the comparative example.
The thickness of the graphite crucible is 20mm, and the thickness of the graphite backing ring is 2-2.5 mm, which is only one tenth of the thickness of the graphite crucible. Taking the minimum siliconizing furnace height as 1000mm and the average thickness of the brake disc carbon/carbon blank as 34mm as an example, if only 18 layers can be placed by using a graphite crucible, and 27 layers can be placed by using a graphite backing ring to separate the blank in example 1, the production efficiency of a single furnace is improved by 50%. If the furnace chamber height is larger, the single furnace lifting efficiency is also larger, so the method of the invention can obviously improve the production efficiency.
Example 2
A preparation method of a carbon-ceramic brake disc comprises the following steps:
1) cutting a carbon felt to obtain a carbon fiber preform blank according to the actual specification requirement of the carbon ceramic brake disc, and then carrying out first vacuum heat treatment on the blank. The first vacuum heat treatment temperature is 1500 deg.C, time is 4h, and pressure is below 1000 Pa.
2) And (3) placing the carbon fiber preform blank subjected to the first vacuum heat treatment in a CVD furnace for vapor deposition, wherein methane is used as reaction gas, the deposition pressure is 1KPa, the deposition temperature is 800 ℃, and the deposition time is 350 h. Until the density of the carbon fiber preform blank reaches 1.30-1.55 g/cm3Obtaining a low-density carbon/carbon blank;
3) carrying out second vacuum heat treatment on the low-density carbon/carbon blank at 1850 ℃ for 6 hours, and finishing machining according to the drawing requirements of brake disc parts after discharging;
steps 4) and 5) were the same as in example 1.
Example 3
A preparation method of a carbon-ceramic brake disc comprises the following steps:
1) cutting a carbon felt to obtain a carbon fiber preform blank according to the actual specification requirement of the carbon ceramic brake disc, and then carrying out first vacuum heat treatment on the blank. The first vacuum heat treatment temperature is 1700 ℃, the time is 2h, and the pressure is below 1000 Pa.
2) And (3) placing the carbon fiber preform blank subjected to the first vacuum heat treatment in a CVD furnace for vapor deposition, wherein methane is used as reaction gas, the deposition pressure is 3KPa, the deposition temperature is 950 ℃, and the deposition time is 200 h. Until the density of the carbon fiber preform blank reaches 1.30-1.55 g/cm3Obtaining a low-density carbon/carbon blank;
3) carrying out second vacuum heat treatment on the low-density carbon/carbon blank at 1900 ℃ for 3h, and finishing machining according to the drawing requirements of brake disc parts after discharging;
steps 4) and 5) were the same as in example 1.
Mechanical property tests are carried out on the carbon-ceramic brake discs prepared in the examples 2 and 3, the results are close to those of the example 1, and the carbon-ceramic brake discs with stable performance can be obtained by the method.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The preparation method of the carbon-ceramic brake disc is characterized by comprising the following steps:
1) preparing a carbon fiber preform blank according to the actual specification requirement of the carbon ceramic brake disc, and then carrying out first vacuum heat treatment on the blank;
2) placing the carbon fiber preform blank subjected to the first vacuum heat treatment in a chemical vapor deposition furnace for vapor deposition until the density of the carbon fiber preform blank reaches 1.30-1.55 g/cm3Obtaining a low-density carbon/carbon blank;
3) sequentially carrying out second vacuum heat treatment and machining on the low-density carbon/carbon blank;
4) placing the machined low-density carbon/carbon blank into silicon powder dipping slurry, and drying after dippingDrying to obtain the carbon/carbon blank impregnated with the silicon powder, wherein the density of the carbon/carbon blank is 1.80-1.95 g/cm3；
5) And (3) loading a plurality of carbon/carbon blanks impregnated by the silicon powder into a silicification furnace, separating adjacent blanks by using backing rings, and sintering to obtain the carbon-ceramic brake disc.
2. The preparation method of the carbon-ceramic brake disc as claimed in claim 1, wherein in the step 1), the temperature of the first vacuum heat treatment is 1500-1700 ℃, and the time is 2-4 hours.
3. The preparation method of the carbon-ceramic brake disc as claimed in claim 1, wherein in the step 2), the chemical vapor deposition takes natural gas, methane or propane as reaction gas, the deposition pressure is 1-3 KPa, the deposition temperature is 800-950 ℃, and the deposition time is 200-350 h.
4. The preparation method of the carbon-ceramic brake disc as claimed in claim 1, wherein in the step 3), the temperature of the second vacuum heat treatment is 1800-1900 ℃ and the time is 3-6 hours.
5. The preparation method of the carbon-ceramic brake disc as claimed in claim 1, wherein in the step 4), the silicon powder impregnation slurry is obtained by mixing silicon powder, a dispersing agent and a solvent and then performing ball milling.
6. The preparation method of the carbon-ceramic brake disc as claimed in claim 5, wherein the dispersant is polyethyleneimine, and the solvent is a mixed solvent of ethanol and acetone, and the volume ratio of the two is 1: 1.
7. The preparation method of the carbon-ceramic brake disc as claimed in claim 5, wherein the solid content of the silicon powder in the silicon powder dipping slurry is 20-30%, and the mass fraction of the dispersant is 3-7%; the mass fraction of the solvent is 63-77%.
8. The method for preparing the carbon-ceramic brake disc as claimed in claim 1, wherein in the step 4), the machined low-density carbon/carbon blank is placed in a vacuum impregnation tank, vacuum pumping is carried out until the pressure in the tank reaches below 1000Pa, then the silicon powder impregnation slurry is pressed into the impregnation tank under the action of atmospheric pressure, and the low-density carbon/carbon blank is immersed; and then applying 1-2 MPa of air pressure to the slurry in the impregnation tank, maintaining the pressure, releasing the pressure, taking out the low-density carbon/carbon blank body soaked with the silicon powder, and then placing the low-density carbon/carbon blank body soaked with the silicon powder in an oven for drying to obtain the carbon/carbon blank body soaked with the silicon powder.
9. The preparation method of the carbon-ceramic brake disc as claimed in claim 1, wherein in the step 5), the backing ring is a graphite backing ring, and the thickness of the backing ring is 2-2.5 mm.
10. The method for preparing a carbon-ceramic brake disc as claimed in claim 1, wherein in step 5), the sintering procedure comprises: heating to 1450 ℃ at the speed of 3-5 ℃/min, preserving heat for 8-12 min, and then naturally cooling to below 150 ℃ for discharging; and the vacuum degree in the sintering process is 100-500 Pa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20201106 |