CN112457038A - Preparation method of carbon/carbon composite material thin-wall cylinder - Google Patents
Preparation method of carbon/carbon composite material thin-wall cylinder Download PDFInfo
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- CN112457038A CN112457038A CN202011266217.9A CN202011266217A CN112457038A CN 112457038 A CN112457038 A CN 112457038A CN 202011266217 A CN202011266217 A CN 202011266217A CN 112457038 A CN112457038 A CN 112457038A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 173
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 103
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 60
- 239000004917 carbon fiber Substances 0.000 claims abstract description 60
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000000151 deposition Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 230000008021 deposition Effects 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000001771 vacuum deposition Methods 0.000 claims abstract description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 72
- 239000010439 graphite Substances 0.000 claims description 72
- 239000007789 gas Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 17
- 239000011261 inert gas Substances 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 4
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000010923 batch production Methods 0.000 abstract description 4
- 238000005255 carburizing Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000005137 deposition process Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- 238000004804 winding Methods 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
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- 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
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/614—Gas infiltration of green bodies or pre-forms
Abstract
The invention provides a preparation method of a carbon/carbon composite material thin-wall cylinder, which is used for solving the problems of long preparation process cycle, low efficiency and low product strength of a carbon/carbon composite cylinder in the prior art. The preparation method of the carbon/carbon composite material thin-wall cylinder comprises the steps of electrifying and heating a carbon fiber cylinder prefabricated body in a vacuum deposition chamber, and heating the cylinder internally to ensure that the cylinder prefabricated body is heated unevenly on the cylinder walls with different radial wall thicknesses and has a temperature gradient; introducing carbon source deposition mixed gas into the vacuum deposition chamber, and performing uniform carburization in the carbon fiber of the cylinder wall based on temperature gradient to obtain carbon fiber with the density of 1.5-1.8 g/cm3The carbon/carbon composite thin-walled cylinder of (1). The invention ensures that the cylinder wall has uniform carburizing quantity at different thicknesses, improves the mechanical strength and the service life, does not need an external heat source to provide high temperature, reduces the energy consumption, shortens the production period, improves the production efficiency and can realize batch production.
Description
Technical Field
The invention belongs to the field of preparation of carbon-based composite material structural members, and particularly relates to a preparation method of a carbon/carbon composite material thin-wall cylinder.
Background
The carbon/carbon composite material is a carbon fiber reinforced carbon matrix composite material with low density (<2.0g/cm3) The high-strength high-thermal-conductivity high-expansion-resistance high-temperature-resistant high-strength high-thermal-conductivity low-expansion-resistance high-temperature-resistant high-dimensional stability high-temperature-resistant high-expansion-resistance high-temperature-resistant high-dimensional stability is high, and the. In the photovoltaic industry, high is often employedAnd preparing the monocrystalline silicon or the polycrystalline silicon in a warm drawing or casting mode. The crystallization process of monocrystalline silicon or polycrystalline silicon is slow and requires high temperature conditions, and carbon/carbon composite material thin-wall cylinders are usually adopted as parts of crucibles or crucible walls, heat insulation cylinders, guide cylinders, heat preservation barrels and the like.
In the prior art, a carbon/carbon composite material thin-wall cylinder is generally prepared by adopting a mode of heating and depositing a preform and a high-temperature vacuum furnace. For example, chinese patent No. 201120219675.7 discloses a carbon/carbon composite material guide cylinder, which is prepared by forming, assembling and purifying in a vacuum furnace at high temperature, and then performing chemical vapor deposition to densify the material, so as to form a dense pyrolytic carbon coating on the surface of the cylinder. However, the deposition process is performed in a high-temperature vacuum furnace with uniform temperature, and the deposited carbon coating is not uniform in the radial direction of the wall thickness of the guide cylinder, even can only be coated on the surface, and the strength of the cylinder cannot be further improved. Meanwhile, the vacuum high-temperature furnace has high energy consumption and high production cost.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, the present invention aims to provide a method for preparing a carbon/carbon composite material thin-walled cylinder, which forms a temperature gradient in the radial direction of the cylinder body by internal heating, so that the whole cylinder body is carburized and enhanced, thereby not only reducing the production cost of the cylinder, but also improving the mechanical strength and the service life of the cylinder.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the embodiment of the invention provides a preparation method of a carbon/carbon composite material thin-wall cylinder, which comprises the following steps: electrically heating the carbon fiber cylinder preform in a vacuum deposition chamber to enable the cylinder preform to have a temperature gradient on the radial cylinder wall; introducing carbon source deposition mixed gas into the vacuum deposition chamber, and performing uniform carburization in the carbon fiber of the cylinder wall based on temperature gradient to obtain carbon fiber with the density of 1.5-1.8 g/cm3The carbon/carbon composite thin-walled cylinder of (1).
As a preferred embodiment of the present invention, the electrically heated carbon fiber cylindrical preform further includes:
firstly, preparing a carbon fiber cylinder prefabricated body, simultaneously preparing graphite electrode joints matched with two end parts of the carbon fiber prefabricated body, connecting the graphite electrode joints to the two end parts of the prefabricated body, and starting to heat the cylinder prefabricated body after electrifying the graphite electrode joints.
As a preferred embodiment of the present invention, the graphite electrode tabs include at least a first graphite electrode tab and a second graphite electrode tab; the cylinder mounting end of the first graphite electrode joint is connected with one end of the carbon fiber prefabricated body, and the power supply end of the first graphite electrode joint is in threaded connection with the positive electrode of a power supply; the cylinder mounting end of the second graphite electrode joint is connected with the other end of the carbon fiber prefabricated body, and the power supply end of the second graphite electrode joint is in threaded connection with the negative electrode of the power supply.
As a preferred embodiment of the invention, when N is prepared, and N is more than or equal to 2 thin-wall cylinders, the graphite electrode joint further comprises N-1 third graphite electrode joints, one end of each third graphite electrode joint is connected with the top end of one carbon fiber cylinder prefabricated body, and the other end of each third graphite electrode joint is connected with the bottom end of the other carbon fiber cylinder prefabricated body; and the N cylindrical preforms form a series circuit through N-1 third graphite electrode connectors, and the carbon fiber cylindrical preforms are heated through the series circuit.
As a preferred embodiment of the invention, when N is prepared, N is more than or equal to 2 thin-wall cylinders, the graphite electrode joints comprise N first graphite electrode joints and N second graphite electrode joints, N cylinder preforms form a parallel circuit through the N first graphite electrode joints and the N second graphite electrode joints, and the carbon fiber cylinder preforms are heated through the parallel circuit.
In a preferred embodiment of the present invention, the graphite electrode tab is made of electrode graphite having a resistivity of 8 to 15 μ Ω · m.
As a preferred embodiment of the present invention, the carbon fiber includes pitch-based carbon fiber, polyacrylonitrile-based carbon fiber; the volume density of the carbon fiber cylinder preform is 0.20-0.60 g/cm3The wall thickness is 2-10 mm.
As a preferred embodiment of the invention, the carbon source deposition mixed gas is a mixed gas of hydrocarbon gas and inert gas; wherein the hydrocarbon gas provides a carbon source for said carbon deposition; the inert gas adjusts the temperature gradient through the proportion in the mixed gas, thereby adjusting the temperature of carbon deposition.
As a preferred embodiment of the invention, the temperature gradient range is 800-1200 ℃, and the deposition time is 20-120 h.
As a preferred embodiment of the present invention, the method for preparing a carbon/carbon composite thin-walled cylinder further comprises: and after the carburization is finished, performing high-temperature treatment and machining on the carbon/carbon composite material thin-wall cylinder blank to obtain a thin-wall cylinder finished product.
The invention has the following beneficial effects:
the preparation method of the carbon/carbon composite material thin-wall cylinder provided by the embodiment of the invention is based on chemical vapor infiltration, the carbon fiber cylinder preform is heated in a vacuum deposition chamber by electrifying, and the cylinder preform is heated unevenly on the cylinder walls with different radial wall thicknesses by heating the inside of the cylinder, so that the cylinder preform has a temperature gradient; introducing carbon source deposition mixed gas into the vacuum deposition chamber, and performing uniform carburization in the carbon fiber of the cylinder wall based on temperature gradient to obtain carbon fiber with the density of 1.5-1.8 g/cm3The carbon/carbon composite thin-walled cylinder of (1). The method ensures that the positions with different thicknesses on the cylinder wall have uniform carburization amount, improves the mechanical strength and the service life of the thin-wall cylinder, does not need an external heat source to provide high temperature, reduces the energy consumption, can quickly prepare the carbon/carbon composite material thin-wall cylinder, has short preparation process period, high efficiency, simple process and convenient control, and can realize batch production.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic view of the principle of carbon deposition by electrically heating a carbon fiber cylindrical preform in an embodiment of the present invention.
Description of reference numerals:
10-carbon fiber cylinder preform; 20-a first graphite electrode joint; 21-the barrel mounting end of the first graphite electrode contact; 22-power end of first graphite electrode contact; 30-a second graphite electrode joint; 31-the barrel mounting end of the second graphite electrode contact; 32-power end of second graphite electrode contact.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the invention provides a preparation method of a carbon/carbon composite material thin-wall cylinder, which is based on chemical vapor infiltration and realizes that the cylinder is heated unevenly in the radial direction by heating the cylinder internally, so that the wall of the cylinder has even carburization amount at different thicknesses, the mechanical strength of the thin-wall cylinder is improved, meanwhile, an external heat source is not needed to provide high temperature, the production energy consumption is saved, the carbon/carbon composite material thin-wall cylinder can be prepared quickly, the preparation process period is long, the efficiency is high, the process is simple, the control is convenient, and the batch production is facilitated.
The method for manufacturing a thin-walled cylinder provided in this embodiment includes: electrically heating the carbon fiber cylinder preform in a vacuum deposition chamber to enable the cylinder preform to have a temperature gradient on the radial cylinder wall; introducing carbon source deposition mixed gas into the vacuum deposition chamber, and performing uniform carburization in the carbon fiber of the cylinder wall based on temperature gradient to obtain carbon fiber with the density of 1.5-1.8 g/cm3The carbon/carbon composite thin-walled cylinder of (1).
Fig. 1 shows a schematic view of the principle of carbon deposition by electrically heating a carbon fiber cylindrical preform according to the present embodiment. As shown in fig. 1, a carbon fiber cylindrical preform 10 is prepared, graphite electrode tabs 20 and 30 fitted to both ends of the carbon fiber preform are prepared at the same time, the graphite electrode tabs are connected to both ends of the preform, and heating of the cylindrical preform is started after the graphite electrode tabs are energized. The graphite electrode joint is screwed on a power supply. Preferably, the power supply is 380V and 50Hz three-phase alternating current. After the connection is finished, the power supply is started, the carbon fiber cylinder prefabricated body, the graphite electrode joint and the power supply form a passage, the carbon fiber cylinder prefabricated body starts to generate heat after being electrified due to the fact that the carbon fiber cylinder prefabricated body has a preset resistance value, self-heating is achieved, temperature gradients are formed in the cylinder and outside the cylinder along the radial direction from the center of the cylinder wall due to the existence of the wall thickness, and the temperature range of the temperature gradients is controlled through electrifying time and parameter control.
Preferably, in this step, the carbon fibers include pitch-based carbon fibers and polyacrylonitrile-based carbon fibers; the volume density of the carbon fiber cylinder preform is 0.20-0.60 g/cm3The wall thickness is 2-10 mm; the graphite electrode joint is made of electrode graphite with the resistivity of 8-15 mu omega.
Preferably, when a plurality of carbon fiber cylindrical preforms are simultaneously prepared, the plurality of cylindrical preforms may be connected in series or in parallel, and simultaneous heating is achieved in one circuit.
As described above, the deposition carbon source mixed gas, which is a mixed gas of a hydrocarbon gas and an inert gas, is introduced into the vacuum deposition chamber. The hydrocarbon gas provides a carbon source for the carbon deposition, and preferably is a micromolecular organic gas which is easy to crack, such as methane, propane, propylene and the like; the inert gas is used for adjusting the carbon deposition temperature through the proportion in the mixed gas, so that the temperature gradient is adjusted; preferably, the inert gas is nitrogen, argon, or the like. In the embodiment, the temperature gradient ranges from 800 ℃ to 1200 ℃, and the deposition time is 20-120 h.
Generally, when a vacuum sintering furnace is used for carbon deposition of a carbon/carbon composite material, high temperature is provided for the carbon deposition process through a furnace body, cylinders including the inner part in the whole sintering furnace cavity are all at the same uniform temperature, carbon deposited on different wall thicknesses is not uniform, multiple cycles are needed under an isothermal deposition process to achieve the expected density requirement, and the deposition time is 300-380 hours. According to the scheme, the deposition process of the embodiment shortens the process period and saves the energy consumption cost.
As described above, the method for manufacturing the carbon/carbon composite thin-walled cylinder further includes: and after the carburization is finished, performing high-temperature treatment and machining on the carbon/carbon composite material thin-wall cylinder blank to obtain a thin-wall cylinder finished product.
Preferably, the high-temperature treatment is carried out at 1600-2500 ℃, the treatment time is 4-10 h, and the heating rate is less than or equal to 100 ℃/h.
The present invention will be described in further detail below with reference to specific embodiments thereof, with reference to the accompanying drawings. This example is merely an additional description of the embodiments and does not limit the present invention.
In this embodiment, a carbon/carbon composite material thin-wall crucible for preparing monocrystalline silicon is taken as an example, and the crucible here can also be a guide cylinder, a heat insulation cylinder, a heat preservation barrel and the like.
The preparation method of the carbon/carbon composite material thin-wall crucible provided by the embodiment comprises the following steps:
step S1, preparing a cylindrical preform of a carbon fiber-carbon cloth laminated winding structure by adopting 12k carbon fiber plain cloth, wherein the volume density of the preform is 0.60g/cm3The wall thickness was 10 mm.
Step S2, preparing at least two circular graphite electrode connectors according to the sizes of the two ends of the carbon fiber cylinder prefabricated body, wherein the circular graphite electrode connectors are respectively a first graphite electrode connector and a second graphite electrode connector. As shown in fig. 1, wherein the cylinder mounting end 21 of the first graphite electrode joint 20 is connected with one end of the carbon fiber preform 10, and the joint power end 22 is screwed with the positive electrode of the power supply; the cylinder mounting end 31 of the second graphite electrode joint 30 is connected with the other end of the carbon fiber preform, and the joint power end 32 is in threaded connection with the negative electrode of the power supply. The resistivity of the graphite electrode joint is 8 mu omega-m.
In the step, when N (N is more than or equal to 2) thin-wall cylinders are prepared, N-1 third graphite electrode joints are also required to be prepared, one end of each third graphite electrode joint is connected with the top end of the carbon fiber cylinder prefabricated body, and the other end of each third graphite electrode joint is connected with the bottom end of the carbon fiber cylinder prefabricated body. And the N cylindrical preforms form a series circuit, and the carbon fiber cylindrical preforms are heated through the series circuit.
The series connection is only illustrative, and in actual operation, the parallel connection can be adopted. When the parallel connection is adopted, the first graphite electrode joints and the second graphite electrode joints with the same number as the thin-wall cylinders are prepared.
And step S3, connecting the graphite electrode joint with the carbon fiber prefabricated body to form a heating unit, and if a plurality of prefabricated bodies exist, connecting the graphite electrode joints of the plurality of heating units in series or in parallel.
And step S4, placing the heating unit in a vacuum deposition chamber, and vacuumizing. The vacuum degree, namely the furnace pressure is less than 10 Pa.
And step S5, electrifying and heating the heating unit, and introducing mixed gas of propane and nitrogen after the heating temperature reaches the deposition temperature. The gas is mixed, each gas is introduced into the gas mixing tank according to the preset flow rate, and the gas is introduced into the furnace body according to the preset flow rate after being fully mixed. For example, the propane and the nitrogen are introduced into the gas mixing tank at a rate of 20L/min and 30L/min, and the two gases are mixed for a predetermined time and then are introduced into the furnace body from the gas mixing tank.
And step S6, cooling and taking out the heating unit after the preset deposition time is reached, and removing the graphite electrode joint to obtain the deposited carbon/carbon composite material cylinder blank.
And step S7, performing high-temperature treatment on the carbon/carbon composite material cylinder blank. The high-temperature treatment temperature is 2500 ℃, the treatment time is 4h, and the heating rate is 100 ℃/h.
And step S8, machining the carbon/carbon composite material cylinder blank after high-temperature treatment according to requirements to obtain a thin-wall cylinder with preset wall thickness and preset carbon/carbon ratio parameters.
According to the technical scheme, the carbon/carbon composite material thin-wall cylinder preparation method provided by the embodiment of the invention has the advantages that the carbon deposition is carried out in an internal heating mode, the deposition time is short, and the process period is shortened; a vacuum high-temperature furnace is not needed to provide a high-temperature environment, so that the energy consumption is reduced, and the resources are saved; the preparation process is simple, the parameters are convenient to control, and batch production can be realized; meanwhile, the prepared thin-wall cylinder has uniform carburization on the radial cylinder wall, so that the mechanical strength of the thin-wall cylinder is improved, and the service life of the thin-wall cylinder is prolonged.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (10)
1. A method of making a carbon/carbon composite thin-walled cylinder, the method comprising: electrically heating the carbon fiber cylinder preform in a vacuum deposition chamber to enable the cylinder preform to have a temperature gradient on the radial cylinder wall; introducing carbon source deposition mixed gas into the vacuum deposition chamber, and performing uniform carburization in the carbon fiber of the cylinder wall based on temperature gradient to obtain carbon fiber with the density of 1.5-1.8 g/cm3The carbon/carbon composite thin-walled cylinder of (1).
2. The method of making a thin-walled cylinder as claimed in claim 1, wherein said electrically heating a carbon fiber cylinder preform further comprises:
firstly, preparing a carbon fiber cylinder prefabricated body, simultaneously preparing graphite electrode joints matched with two end parts of the carbon fiber prefabricated body, connecting the graphite electrode joints to the two end parts of the prefabricated body, and starting to heat the cylinder prefabricated body after electrifying the graphite electrode joints.
3. The method of making a thin-walled cylinder of claim 2, wherein the graphite electrode tabs comprise at least a first graphite electrode tab and a second graphite electrode tab; the cylinder mounting end of the first graphite electrode joint is connected with one end of the carbon fiber prefabricated body, and the power supply end of the first graphite electrode joint is in threaded connection with the positive electrode of a power supply; the cylinder mounting end of the second graphite electrode joint is connected with the other end of the carbon fiber prefabricated body, and the power supply end of the second graphite electrode joint is in threaded connection with the negative electrode of the power supply.
4. The method for manufacturing a thin-walled cylinder according to claim 3, wherein when N is prepared and N is not less than 2 thin-walled cylinders, the graphite electrode joints further comprise N-1 third graphite electrode joints, one end of each third graphite electrode joint is connected with the top end of a carbon fiber cylinder preform, and the other end of each third graphite electrode joint is connected with the bottom end of another carbon fiber cylinder preform; and the N cylindrical preforms form a series circuit through N-1 third graphite electrode connectors, and the carbon fiber cylindrical preforms are heated through the series circuit.
5. The method for manufacturing a thin-walled cylinder according to claim 3, wherein when N is manufactured and N is 2 or more thin-walled cylinders, the graphite electrode joints comprise N first graphite electrode joints and N second graphite electrode joints, the N cylinder preforms form a parallel circuit by the N first graphite electrode joints and the N second graphite electrode joints, and the carbon fiber cylinder preforms are heated by the parallel circuit.
6. The method for manufacturing a thin-walled cylinder according to any one of claims 2 to 5, wherein the graphite electrode tab is made of electrode graphite having a resistivity of 8 to 15 μ Ω -m.
7. Method for manufacturing a thin-walled cylinder according to any of claims 1 to 5, wherein the carbon fibres comprise pitch-based carbon fibres, polyacrylonitrile-based carbon fibres; the volume density of the carbon fiber cylinder preform is 0.20-0.60 g/cm3The wall thickness is 2-10 mm.
8. The method for manufacturing a thin-walled cylinder according to claim 7, wherein the sedimentary carbon source mixed gas is a mixed gas of a hydrocarbon gas and an inert gas; wherein the hydrocarbon gas provides a carbon source for said carbon deposition; the inert gas adjusts the temperature gradient through the proportion in the mixed gas, thereby adjusting the temperature of carbon deposition.
9. The method for making a thin-walled cylinder according to claim 8, wherein the temperature gradient is in the range of 800 to 1200 ℃ and the deposition time is in the range of 20 to 120 hours.
10. The method of making a thin-walled cylinder of claim 1, wherein the method of making a carbon/carbon composite thin-walled cylinder further comprises: and after the carburization is finished, performing high-temperature treatment and machining on the carbon/carbon composite material thin-wall cylinder blank to obtain a thin-wall cylinder finished product.
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