CN117073442A - High-heat-conductivity integrated C/C radiating fin and processing technology thereof - Google Patents
High-heat-conductivity integrated C/C radiating fin and processing technology thereof Download PDFInfo
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- CN117073442A CN117073442A CN202311036355.1A CN202311036355A CN117073442A CN 117073442 A CN117073442 A CN 117073442A CN 202311036355 A CN202311036355 A CN 202311036355A CN 117073442 A CN117073442 A CN 117073442A
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- 238000012545 processing Methods 0.000 title claims abstract description 28
- 238000005516 engineering process Methods 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 54
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 31
- 239000004917 carbon fiber Substances 0.000 claims abstract description 31
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000000465 moulding Methods 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 230000017525 heat dissipation Effects 0.000 claims abstract description 14
- 239000011302 mesophase pitch Substances 0.000 claims abstract description 14
- 238000000748 compression moulding Methods 0.000 claims abstract description 10
- 238000000280 densification Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 58
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 41
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- 239000010439 graphite Substances 0.000 claims description 21
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 14
- 229910018054 Ni-Cu Inorganic materials 0.000 claims description 9
- 229910018481 Ni—Cu Inorganic materials 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 9
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- 238000004321 preservation Methods 0.000 claims description 4
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- 238000003754 machining Methods 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 7
- 238000005219 brazing Methods 0.000 abstract description 6
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
- F28F1/22—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means having portions engaging further tubular elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/086—Heat exchange elements made from metals or metal alloys from titanium or titanium alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/04—Fastening; Joining by brazing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to the technical field of heat dissipation material preparation, in particular to a high-heat-conductivity integrated C/C heat dissipation fin and a processing technology thereof, comprising the following steps: s1, cutting and laying down materials; s2, paving a metal Ti pipe; s3, die assembly; s4, curing and forming the prepreg blank after the die assembly by adopting a compression molding process or an autoclave molding process; s5, carbonizing; s6, densification treatment is carried out to obtain a dense integrated C/C radiating fin; s7, processing the outline dimension of the compact integrated C/C radiating fin by adopting a laser processing mode to obtain a final finished product. According to the invention, the high-heat-conductivity mesophase pitch-based carbon fiber is used as a reinforcing material, and the heat source can be rapidly dredged along the fiber direction in a directional arrangement mode. In addition, through the co-curing molding of the heat flow conduit Ti tube and the fin base material, the preparation molding of the integrated C/C radiating fin is realized, and the treatment procedure that the traditional C/C fin is connected with the heat flow conduit and needs to be subjected to secondary brazing is simplified.
Description
Technical Field
The invention relates to the technical field of heat dissipation material preparation, in particular to a high-heat-conductivity integrated C/C heat dissipation fin and a processing technology thereof.
Background
With the rapid development of loading space and deep space exploration, higher design requirements are put forward on the light weight and heat dissipation efficiency of a thermal control system of an aerospace vehicle. In recent years, in aerospace vehicles using nuclear power as a propulsion system, a traditional heat pipe radiator cannot meet design requirements due to the influence of high-temperature complex working conditions.
Compared with the traditional metal heat dissipation material, the C/C composite material has been widely used in the nuclear energy field due to the characteristics of low density, high heat conductivity, high strength, low expansion coefficient, low neutron activation energy and the like. Therefore, the C/C composite material can replace the traditional metal heat dissipation material and be used as a heat dissipation fin in a heat pipe radiator, and the high heat dissipation problem of a heat control system of a nuclear power aerospace vehicle can be effectively solved by connecting the heat dissipation fin with a heat flow conduit.
According to the domestic and foreign literature data, the existing C/C radiating fins are mostly of single-sided wedge rib type structures, and the reinforcing materials in the C/C composite material are mostly PAN-based carbon fibers, so that the heat conduction efficacy of the C/C radiating fins is limited to a certain extent. In addition, the C/C fins are often connected to the heat flow conduit by vacuum brazing. The method has high technical maturity, but the C/C fin can be brazed with the heat flow conduit after the preparation is finished, so that the preparation cost and the production period are increased.
Therefore, the design of the high heat conduction C/C fin can simplify the connection method of the C/C fin and the heat flow conduit, and the technical problem to be solved is urgent for upgrading and upgrading of the product.
Disclosure of Invention
Aiming at the problems that a C/C radiating fin in the prior art is poor in heat conduction effect and small in single-layer radiating surface heat passage, and the C/C fin and a heat flow conduit are required to be subjected to secondary brazing connection, the invention provides a high-heat-conductivity integrated C/C radiating fin and a processing technology thereof.
The invention is realized by the following technical scheme:
a processing technology of a high-heat-conductivity integrated C/C radiating fin comprises the following steps:
s1, cutting and blanking high-heat-conductivity mesophase pitch-based unidirectional carbon fiber prepreg, and respectively layering in an upper die and a lower die of a metal die;
s2, polishing and cleaning the surface of the metal Ti pipe, and paving the Ti pipe by using a high carbon residue resin adhesive film containing filler; then, the Ti pipe paved with the resin adhesive film is horizontally arranged in an axial groove of the prepreg on the surface of the lower die;
s3, closing the upper die and the lower die of the prepreg with the symmetrically paved layers paved on the surface of the die, wherein the Ti pipe paved with the resin adhesive film is ensured to be kept fixed in the axial groove of the prepreg in the closing process;
s4, curing and forming the prepreg blank after the die assembly by adopting a compression molding process or an autoclave molding process to obtain a CFRP blank;
s5, transferring the CFRP blank after the solidification and molding into a graphite tool for carbonization; removing the graphite tool after carbonization to obtain an integrated C/C fin blank;
s6, performing densification treatment on the carbonized C/C blank by a Chemical Vapor Infiltration (CVI) process to obtain a densified integrated C/C radiating fin;
s7, processing the outline dimension of the compact integrated C/C radiating fin by adopting a laser processing mode to obtain a final finished product.
Preferably, in S1, the high thermal conductivity mesophase pitch-based unidirectional carbon fiber prepreg has a fiber areal density of 130g/m 2 -150g/m 2 The cutting angle at the time of cutting is 0 ° or 5 °.
Preferably, in S1, in a lower die of a metal die, a plurality of layers of unidirectional carbon fiber prepregs which are cut and well-cut are arranged according to a setThe layer structure is paved layer by layer, and the set layer structure is [0 degree/(plus or minus 5 degrees)/0 degree] s Or [ + -5 °] s ；
In an upper die of a metal die, a plurality of layers of unidirectional carbon fiber prepregs are paved and stuck layer by layer according to a symmetrical structure.
Preferably, in S2, the high carbon residue resin adhesive film is made of phenolic resin or modified benzoxazine resin with the mass ratio of (85-90): (10-15) and Ti-Zr-Ni-Cu alloy powder, and the surface density of the resin adhesive film is 50g/m 2 -100g/m 2 。
Preferably, in S4, a compression molding process or an autoclave molding process is used for the curing molding.
Preferably, in S5, the graphite tooling is the same as the structural size of the integrated fin CFRP blank forming metal mold.
Preferably, in S5, the specific process of carbonization is:
transferring the CFRP blank of the integrated fin to a graphite tool, and then placing the CFRP blank into a carbonization furnace; after argon is filled into the carbonization furnace, heating is started, the temperature is raised to 1000-1200 ℃, the heat is preserved for 6-8 hours, and the carbonization furnace is cooled to the room temperature along with the furnace;
in the heating process, the heat preservation treatment is carried out in stages, and the temperature is continuously raised according to the heating speed after the heat preservation.
Preferably, in S6, the specific steps of the densification process are:
putting the integrated C/C fin into a CVI deposition furnace, and introducing C into the furnace body 3 H 6 Is a carbon source gas, N 2 For diluting the gas, C 3 H 6 And N 2 The volume ratio of (2) is 3:1; the deposition temperature is 950 ℃ to 1100 ℃, and the furnace pressure is less than 1kPa; the deposition time is 150-200h.
A high heat conduction integrated C/C radiating fin obtained by a high heat conduction integrated C/C radiating fin processing technology.
Preferably, the high-heat-conductivity C/C fin structure comprises a high-heat-conductivity C/C fin and a metal Ti pipe, wherein the high-heat-conductivity C/C fin and the metal Ti pipe are combined and connected to form a non-full-surrounding structure, an adhesion transition layer is arranged between the high-heat-conductivity C/C fin and the metal Ti pipe, and the high-heat-conductivity C/C fin is of a double-sided symmetrical structure.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a processing technology of a high-heat-conductivity integrated C/C radiating fin, which adopts high-modulus high-heat-conductivity mesophase pitch-based carbon fiber as a reinforcing material, adopts high carbon residue resin (phenolic resin, modified benzoxazine resin and the like) as a matrix, prepares unidirectional carbon fiber prepreg, prepares a high-heat-conductivity C/C composite material oriented along the fiber direction through the procedures of layering, curing molding, carbonization and the like, and then co-cures and molds the high-heat-conductivity C/C composite material and prepreg. After high-temperature carbonization treatment, the resin adhesive film layer is converted into an adhesion transition layer between the C/C fin and the metal Ti pipe, so that the high-heat-conductivity integrated C/C fin oriented along the fiber direction is formed.
The high-heat-conductivity integrated C/C radiating fin processed by the invention adopts high-heat-conductivity mesophase pitch-based carbon fibers as reinforcing materials, and realizes that a heat source can be rapidly dredged along the fiber direction in a directional arrangement mode. In addition, through the co-curing molding of the heat flow conduit Ti tube and the fin base material, the preparation molding of the integrated C/C radiating fin is realized, and the treatment procedure that the traditional C/C fin is connected with the heat flow conduit and needs to be subjected to secondary brazing is simplified.
The high heat conduction C/C fin and the metal Ti tube are combined and connected to form a non-full-surrounding structure, so that the heat conduction effect of the C/C fin is not affected due to bending fracture of the high-modulus high heat conduction mesophase pitch-based carbon fiber in the corner region. Compared with the traditional C/C fin, the high-heat-conductivity C/C fin has a high-fiber orientation design structure, so that heat sources can be ensured to be rapidly led into the external environment along the fiber direction after being transmitted to the high-heat-conductivity C/C fin through the metal Ti tube. Secondly, the fins with double-sided symmetrical structures enable the fins to have larger radiating surfaces.
Drawings
FIG. 1 is a schematic diagram of a process for processing an integrated C/C heat sink fin with high thermal conductivity.
Fig. 2 is a schematic view of a high thermal conductivity integrated C/C heat sink fin structure.
FIG. 3 is a cross-sectional view of a high thermal conductivity integrated C/C heat sink fin.
In the figure, 1, a high heat conduction C/C fin; 2. a metal Ti tube; 3. and bonding the transition layer.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention discloses a processing technology of a high-heat-conductivity integrated C/C radiating fin, which comprises the following steps with reference to FIG. 1:
s1, the surface density of the fiber is 130g/m 2 -150g/m 2 Cutting and blanking (cutting angle is 0 degree or 5 degrees) the high-heat-conductivity mesophase pitch-based unidirectional carbon fiber prepreg, and respectively paving the prepreg in an upper die and a lower die of a metal die.
Wherein, in the lower die of the metal die, a plurality of layers of unidirectional carbon fiber prepregs which are cut and offsetted are laid according to a preset layer structure ([ 0 degree/+/-5 degrees/0 degree)] s Or [ + -5 °] s ) And paving and pasting layer by layer.
In an upper die of a metal die, a plurality of layers of unidirectional carbon fiber prepregs are paved and stuck layer by layer according to a symmetrical structure.
S2, polishing and cleaning the surface of the metal Ti pipe, and paving the Ti pipe by using a high carbon residue resin adhesive film containing filler; and then the Ti pipe paved with the resin adhesive film is horizontally arranged in the axial groove of the prepreg on the surface of the lower die.
Wherein the high carbon residue resin adhesive film is prepared from phenolic resin or modified benzoxazine resin and Ti-Zr-Ni-Cu alloy powder with the mass ratio of (85-90) (10-15), and the surface density of the resin adhesive film is 50g/m 2 -100g/m 2 。
And S3, clamping the upper die and the lower die of the prepreg with the symmetrically paved layers paved on the surface of the die, wherein the Ti pipe paved with the resin adhesive film is ensured to be kept fixed in the axial groove of the prepreg in the clamping process.
S4, curing and forming the prepreg blank after the die assembly by adopting a compression molding process or an autoclave molding process to obtain a CFRP blank; and the curing molding adopts a compression molding process or an autoclave molding process.
When a compression molding process is adopted, placing the upper and lower dies after die assembly on a hot press, heating to 120 ℃ from room temperature at a heating rate of 1-3 ℃/min, applying a pressure of 0.1MPa, and preserving heat and pressure for 30min; then heating to 180 ℃, applying pressure to 1-1.5MPa, and preserving heat and pressure for 2h; then heating to 200 ℃, and preserving heat and pressure for 2 hours under the pressure of 1-1.5 MPa; then cooled to 60 ℃ under the pressure of 1-1.5 Mpa.
When an autoclave molding process is adopted, the upper die and the lower die after die assembly are sequentially wrapped by a porous isolating film and an air felt; then placing the mixture into a vacuum bag which is encapsulated by a vacuum bag film for encapsulation; after the vacuum pipeline is connected with the vacuum air tap, the vacuum bag is subjected to leak detection in a sealing way, when the vacuum degree is less than or equal to-0.095 MPa, the vacuum system is closed, and when the reading of the vacuum meter is checked to be reduced within 10min and is not more than 0.02MPa, the vacuum bag is determined to be well sealed; then, under the condition that the vacuum degree is less than or equal to minus 0.095MPa, pre-pumping the mould in the vacuum bag for 30-40min; transferring the vacuum bag with the die into an autoclave after pre-pumping is finished, vacuumizing to less than or equal to-0.095 MPa, heating to 110 ℃ from room temperature at a heating rate of 1-2 ℃/min, preserving heat for 30min, then boosting to 0.1MPa at a boosting rate of 0.02MPa/min, and preserving heat and pressure for 10min; then when the temperature is raised to 180 ℃ at the heating rate of 1-2 ℃/min, the pressure is raised to 0.9MPa at the pressure raising rate of 0.02MPa/min, and the temperature and the pressure are maintained for 2 hours; then heating to 200 ℃ at a heating rate of 1-2 ℃/min, and preserving heat and pressure for 2h under the pressure of 0.9 MPa; then cooling to 60 ℃ at a cooling rate of 3 ℃/min.
S5, transferring the CFRP blank after solidification and molding into a graphite tool (the structural dimensions of the graphite tool and the CFRP blank molding metal mold of the integrated fin are the same), and carbonizing; and removing the graphite tool after carbonization to obtain an integrated C/C fin blank.
The carbonization process comprises the following specific steps: transferring the CFRP blank of the integrated fin to a graphite tool, putting the graphite tool into a carbonization furnace, filling argon into the carbonization furnace, heating at a heating rate of 3-5 ℃/min, heating to 1000-1200 ℃, preserving heat for 6-8h, and cooling to room temperature along with the furnace; in the heating process, the temperature is kept at 400 ℃, 700 ℃ and 900 ℃ for 30 minutes respectively, and then the temperature is continuously increased according to the heating speed.
S6, performing densification treatment on the carbonized C/C blank by a Chemical Vapor Infiltration (CVI) process to obtain a densified integrated C/C radiating fin, wherein the specific process is as follows:
placing the integrated C/C fin into a CVI deposition furnace, and introducing C into the furnace body 3 H 6 Is a carbon source gas, N 2 For diluting the gas, C 3 H 6 And N 2 The volume ratio of (2) is 3:1; the deposition temperature is 950 ℃ to 1100 ℃, and the furnace pressure is less than 1kPa; the deposition time is 150-200h.
S7, processing the outline dimension of the compact integrated C/C radiating fin by adopting a laser processing mode to obtain a finished product with the final thermal conductivity of more than or equal to 450W/(m.K).
Example 1
S1, the surface density of the fiber is 150g/m 2 Cutting and blanking the high-heat-conductivity mesophase pitch-based unidirectional carbon fiber prepreg according to the angles of 0 DEG and 5 DEG;
cutting off the cut unidirectional carbon fiber prepreg according to the ratio of [0 degree/(+ -5 degree/0 degree)] 3 The layer structure of the metal mold is paved and stuck in the lower die of the metal mold layer by layer. According to a symmetrical structure, unidirectional carbon fiber prepreg is subjected to a process of [0 degree/+/-5 degrees/0 degree] 3 The layer structure of the metal mold is paved and stuck in the upper mold of the metal mold layer by layer;
s2, polishing and cleaning the surface of the metal Ti pipe, and preparing the metal Ti pipe by using phenolic resin and Ti-Zr-Ni-Cu alloy powder with the mass ratio of 90:10, wherein the surface density is 100g/m 2 Paving the Ti pipe by the high carbon residue resin adhesive film; the Ti pipe paved with the resin adhesive film is horizontally arranged in an axial groove of the prepreg on the surface of the lower die;
s3, closing the upper die and the lower die of the prepreg with the symmetrically paved layers paved on the surface of the die, wherein the Ti pipe paved with the resin adhesive film is ensured to be kept fixed in the axial groove of the prepreg in the closing process;
s4, adopting a compression molding process, placing the upper and lower dies after die assembly on a hot press, heating to 120 ℃ from room temperature at a heating rate of 1-3 ℃/min, applying a pressure of 0.1MPa, and preserving heat and pressure for 30min; then heating to 180 ℃, applying pressure to 1-1.5MPa, and preserving heat and pressure for 2h; then heating to 200 ℃, and preserving heat and pressure for 2 hours under the pressure of 1-1.5 MPa; then cooled to 60 ℃ under the pressure of 1-1.5 Mpa.
S5, transferring the CFRP blank after solidification and molding into a graphite tool, putting the graphite tool into a carbonization furnace, filling argon into the carbonization furnace, heating up at a heating rate of 3-5 ℃/min, heating up to 1000 ℃, preserving heat for 8 hours, and cooling to room temperature along with the furnace; in the heating process, the temperature is kept at 400 ℃, 700 ℃ and 900 ℃ for 30 minutes respectively, and then the temperature is continuously increased according to the heating speed.
S6, placing the integrated C/C fin into a CVI deposition furnace, and introducing C into the furnace body 3 H 6 Is a carbon source gas, N 2 For diluting the gas, C 3 H 6 And N 2 The volume ratio of (2) is 3:1; the deposition temperature is 950 ℃, and the furnace pressure is less than 1kPa; the deposition time was 150h.
S7, processing the outline dimension of the compact integrated C/C radiating fin by adopting a laser processing mode to obtain a final finished product.
Example 2
S1, the fiber surface density is 130g/m 2 Cutting and blanking the high-heat-conductivity mesophase pitch-based unidirectional carbon fiber prepreg according to +/-5 degrees; cutting the cut unidirectional carbon fiber prepreg at a temperature of [ +/5 DEG C] 3 The layer structure of the metal mold is paved and stuck in the lower die of the metal mold layer by layer. According to symmetrical structure, unidirectional carbon fiber prepreg is subjected to a temperature of [ +/5 DEG C] 3 The layer structure of the metal mold is paved and stuck in the upper mold of the metal mold layer by layer;
s2, polishing and cleaning the surface of the metal Ti pipe, and preparing the metal Ti pipe by using phenolic resin and Ti-Zr-Ni-Cu alloy powder with the mass ratio of 85:15, wherein the surface density is 50g/m 2 Paving the Ti pipe by the high carbon residue resin adhesive film; the Ti pipe paved with the resin adhesive film is horizontally arranged in an axial groove of the prepreg on the surface of the lower die;
s3, closing the upper die and the lower die of the prepreg with the symmetrically paved layers paved on the surface of the die, wherein the Ti pipe paved with the resin adhesive film is ensured to be kept fixed in the axial groove of the prepreg in the closing process;
s4, adopting a compression molding process, placing the upper and lower dies after die assembly on a hot press, heating to 120 ℃ from room temperature at a heating rate of 1-3 ℃/min, applying a pressure of 0.1MPa, and preserving heat and pressure for 30min; then heating to 180 ℃, applying pressure to 1-1.5MPa, and preserving heat and pressure for 2h; then heating to 200 ℃, and preserving heat and pressure for 2 hours under the pressure of 1-1.5 MPa; then cooled to 60 ℃ under the pressure of 1-1.5 Mpa.
S5, transferring the CFRP blank after solidification and molding into a graphite tool, putting the graphite tool into a carbonization furnace, filling argon into the carbonization furnace, heating up at a heating rate of 3-5 ℃/min, heating up to 1000 ℃, preserving heat for 8 hours, and cooling to room temperature along with the furnace; in the heating process, the temperature is kept at 400 ℃, 700 ℃ and 900 ℃ for 30 minutes respectively, and then the temperature is continuously increased according to the heating speed.
S6, placing the integrated C/C fin into a CVI deposition furnace, and introducing C into the furnace body 3 H 6 Is a carbon source gas, N 2 For diluting the gas, C 3 H 6 And N 2 The volume ratio of (2) is 3:1; the deposition temperature is 950 ℃, and the furnace pressure is less than 1kPa; the deposition time was 150h.
S7, processing the outline dimension of the integrated C/C radiating fin by adopting a laser processing mode to obtain a final finished product.
Example 3
S1, the surface density of the fiber is 150g/m 2 Cutting and blanking the high-heat-conductivity mesophase pitch-based unidirectional carbon fiber prepreg according to the angles of 0 DEG and 5 DEG; cutting off the cut unidirectional carbon fiber prepreg according to the ratio of [0 degree/(+ -5 degree/0 degree)] 3 The layer structure of the metal mold is paved and stuck in the lower die of the metal mold layer by layer. According to a symmetrical structure, unidirectional carbon fiber prepreg is subjected to a process of [0 degree/+/-5 degrees/0 degree] 3 The layer structure of the metal mold is paved and stuck in the upper mold of the metal mold layer by layer;
s2, polishing and cleaning the surface of the metal Ti pipe, and preparing the metal Ti pipe by using modified benzoxazine resin and Ti-Zr-Ni-Cu alloy powder with the mass ratio of 90:10, wherein the surface density is 100g/m 2 Paving the Ti pipe by the high carbon residue resin adhesive film; the Ti pipe paved with the resin adhesive film is horizontally arranged in an axial groove of the prepreg on the surface of the lower die;
s3, closing the upper die and the lower die of the prepreg with the symmetrically paved layers paved on the surface of the die, wherein the Ti pipe paved with the resin adhesive film is ensured to be kept fixed in the axial groove of the prepreg in the closing process;
s4, adopting an autoclave molding process, and sequentially wrapping the upper die and the lower die after die assembly by using a porous isolating film and an airfelt; then placing the mixture into a vacuum bag which is encapsulated by a vacuum bag film for encapsulation; after the vacuum pipeline is connected with the vacuum air tap, the vacuum bag is subjected to leak detection in a sealing way, when the vacuum degree is less than or equal to-0.095 MPa, the vacuum system is closed, and when the reading of the vacuum meter is checked to be reduced within 10min and is not more than 0.02MPa, the vacuum bag is determined to be well sealed; then, under the condition that the vacuum degree is less than or equal to minus 0.095MPa, pre-pumping the mould in the vacuum bag for 30-40min; transferring the vacuum bag with the die into an autoclave after pre-pumping is finished, vacuumizing to less than or equal to-0.095 MPa, heating to 110 ℃ from room temperature at a heating rate of 1-2 ℃/min, preserving heat for 30min, then boosting to 0.1MPa at a boosting rate of 0.02MPa/min, and preserving heat and pressure for 10min; then when the temperature is raised to 180 ℃ at the heating rate of 1-2 ℃/min, the pressure is raised to 0.9MPa at the pressure raising rate of 0.02MPa/min, and the temperature and the pressure are maintained for 2 hours; then heating to 200 ℃ at a heating rate of 1-2 ℃/min, and preserving heat and pressure for 2h under the pressure of 0.9 MPa; then cooling to 60 ℃ at a cooling rate of 3 ℃/min.
S5, transferring the CFRP blank after solidification and molding into a graphite tool, putting the graphite tool into a carbonization furnace, filling argon into the carbonization furnace, heating up at a heating rate of 3-5 ℃/min, heating up to 1200 ℃, preserving heat for 6 hours, and cooling to room temperature along with the furnace; in the heating process, the temperature is kept at 400 ℃, 700 ℃ and 900 ℃ for 30 minutes respectively, and then the temperature is continuously increased according to the heating speed.
S6, placing the integrated C/C fin into a CVI deposition furnace, and introducing C into the furnace body 3 H 6 Is a carbon source gas, N 2 For diluting the gas, C 3 H 6 And N 2 The volume ratio of (2) is 3:1; the deposition temperature is 1100 ℃, and the furnace pressure is less than 1kPa; the deposition time was 200h.
S7, processing the outline dimension of the integrated C/C radiating fin by adopting a laser processing mode to obtain a final finished product.
Example 4
S1, the fiber surface density is 130g/m 2 Is of high thermal conductivityCutting and blanking the mesophase pitch-based unidirectional carbon fiber prepreg according to +/-5 degrees; cutting the cut unidirectional carbon fiber prepreg at a temperature of [ +/5 DEG C] 3 The layer structure of the metal mold is paved and stuck in the lower die of the metal mold layer by layer. According to symmetrical structure, unidirectional carbon fiber prepreg is subjected to a temperature of [ +/5 DEG C] 3 The layer structure of the metal mold is paved and stuck in the upper mold of the metal mold layer by layer;
s2, polishing and cleaning the surface of the metal Ti pipe, and preparing the metal Ti pipe by using modified benzoxazine resin and Ti-Zr-Ni-Cu alloy powder with the mass ratio of 85:15, wherein the surface density is 50g/m 2 Paving the Ti pipe by the high carbon residue resin adhesive film; the Ti pipe paved with the resin adhesive film is horizontally arranged in an axial groove of the prepreg on the surface of the lower die;
s3, closing the upper die and the lower die of the prepreg with the symmetrically paved layers paved on the surface of the die, wherein the Ti pipe paved with the resin adhesive film is ensured to be kept fixed in the axial groove of the prepreg in the closing process;
s4, adopting an autoclave molding process, and sequentially wrapping the upper die and the lower die after die assembly by using a porous isolating film and an airfelt; then placing the mixture into a vacuum bag which is encapsulated by a vacuum bag film for encapsulation; after the vacuum pipeline is connected with the vacuum air tap, the vacuum bag is subjected to leak detection in a sealing way, when the vacuum degree is less than or equal to-0.095 MPa, the vacuum system is closed, and when the reading of the vacuum meter is checked to be reduced within 10min and is not more than 0.02MPa, the vacuum bag is determined to be well sealed; then, under the condition that the vacuum degree is less than or equal to minus 0.095MPa, pre-pumping the mould in the vacuum bag for 30-40min; transferring the vacuum bag with the die into an autoclave after pre-pumping is finished, vacuumizing to less than or equal to-0.095 MPa, heating to 110 ℃ from room temperature at a heating rate of 1-2 ℃/min, preserving heat for 30min, then boosting to 0.1MPa at a boosting rate of 0.02MPa/min, and preserving heat and pressure for 10min; then when the temperature is raised to 180 ℃ at the heating rate of 1-2 ℃/min, the pressure is raised to 0.9MPa at the pressure raising rate of 0.02MPa/min, and the temperature and the pressure are maintained for 2 hours; then heating to 200 ℃ at a heating rate of 1-2 ℃/min, and preserving heat and pressure for 2h under the pressure of 0.9 MPa; then cooling to 60 ℃ at a cooling rate of 3 ℃/min.
S5, transferring the CFRP blank after solidification and molding into a graphite tool, putting the graphite tool into a carbonization furnace, filling argon into the carbonization furnace, heating up at a heating rate of 3-5 ℃/min, heating up to 1200 ℃, preserving heat for 6 hours, and cooling to room temperature along with the furnace; in the heating process, the temperature is kept at 400 ℃, 700 ℃ and 900 ℃ for 30 minutes respectively, and then the temperature is continuously increased according to the heating speed.
S6, placing the integrated C/C fin into a CVI deposition furnace, and introducing C into the furnace body 3 H 6 Is a carbon source gas, N 2 For diluting the gas, C 3 H 6 And N 2 The volume ratio of (2) is 3:1; the deposition temperature is 1100 ℃, and the furnace pressure is less than 1kPa; the deposition time was 200h.
S7, processing the outline dimension of the integrated C/C radiating fin by adopting a laser processing mode to obtain a final finished product.
The invention also discloses a high-heat-conductivity integrated C/C radiating fin which comprises the high-heat-conductivity C/C fin 1 and a metal Ti tube 2, wherein the high-heat-conductivity C/C fin 1 and the metal Ti tube 2 are combined and connected to form a non-fully-enclosed structure, an adhesion transition layer 3 is arranged between the high-heat-conductivity C/C fin 1 and the metal Ti tube 2, and the high-heat-conductivity C/C fin 1 is of a double-sided symmetrical structure.
The high-heat-conductivity C/C fin 1 is prepared by adopting high-modulus high-heat-conductivity mesophase pitch-based carbon fiber as a reinforcing material and high-carbon-residue resin (phenolic resin, modified benzoxazine resin and the like) as a matrix, preparing unidirectional carbon fiber prepreg, and performing procedures such as layering, curing, molding, carbonization and the like to prepare the high-heat-conductivity C/C composite material oriented along the fiber direction.
The metal Ti pipe 2 is a heat flow conduit with thin wall, corrosion resistance and high heat exchange.
The high heat conduction integrated C/C radiating fin is of a combined structure of a high heat conduction C/C fin 1 and a metal Ti tube 2. The polished metal Ti tube 2 is bonded with a high carbon residue resin film containing filler (45 mu m Ti-Zr-Ni-Cu alloy powder, etc.), and then co-cured with a prepreg. After high-temperature carbonization treatment, the resin adhesive film layer is converted into an adhesive transition layer 3 between the C/C fin 1 and the metal Ti pipe 2, and the C/C fin 1 and the metal Ti pipe are tightly connected together to form the high-heat-conductivity integrated C/C fin (the heat conductivity is more than or equal to 450W/(m.K)), so that the process of brazing connection of the traditional heat-conductivity C/C fin and the metal heat flow pipe is omitted, and the preparation process is greatly simplified.
Referring to fig. 2, the high heat conduction integrated C/C heat dissipation fin structure includes a high heat conduction C/C fin 1 and a metal Ti tube 2 for a heat flow conduit, and the metal Ti tube and a C/C fin blank are co-cured and formed in a pre-buried manner to form an integrated C/C heat dissipation fin without secondary brazing connection.
Referring to fig. 3, the C/C fin 1 and the metal Ti tube 2 are connected by means of an adhesion transition layer 3, and the adhesion transition layer 3 is composed of high carbon residue resin carbon containing Ti-Zr-Ni-Cu alloy powder. The bonding transition layer 3 not only can provide bonding effect, but also can reduce residual thermal stress generated between the C/C fin 1 and the metal Ti tube 2 due to the difference of thermal expansion coefficients, and improves the cracking problem generated when the traditional C/C composite material is connected with metal.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the protection scope of the claims.
Claims (10)
1. The processing technology of the high-heat-conductivity integrated C/C radiating fin is characterized by comprising the following steps of:
s1, cutting and blanking high-heat-conductivity mesophase pitch-based unidirectional carbon fiber prepreg, and respectively layering in an upper die and a lower die of a metal die;
s2, polishing and cleaning the surface of the metal Ti pipe, and paving the Ti pipe by using a high carbon residue resin adhesive film containing filler; then, the Ti pipe paved with the resin adhesive film is horizontally arranged in an axial groove of the prepreg on the surface of the lower die;
s3, closing the upper die and the lower die of the prepreg with the symmetrically paved layers paved on the surface of the die, wherein the Ti pipe paved with the resin adhesive film is ensured to be kept fixed in the axial groove of the prepreg in the closing process;
s4, curing and forming the prepreg blank after the die assembly by adopting a compression molding process or an autoclave molding process to obtain a CFRP blank;
s5, transferring the CFRP blank after the solidification and molding into a graphite tool for carbonization; removing the graphite tool after carbonization to obtain an integrated C/C fin blank;
s6, performing densification treatment on the carbonized C/C blank through a chemical vapor infiltration process to obtain a densified integrated C/C radiating fin;
s7, processing the outline dimension of the compact integrated C/C radiating fin by adopting a laser processing mode to obtain a final finished product.
2. The process for manufacturing the high-heat-conductivity integrated C/C radiating fin according to claim 1, wherein in S1, the fiber surface density of the high-heat-conductivity mesophase pitch-based unidirectional carbon fiber prepreg is 130g/m 2 -150g/m 2 The cutting angle at the time of cutting is 0 ° or 5 °.
3. The process for manufacturing the high-heat-conductivity integrated C/C radiating fin according to claim 1, wherein in S1, in a lower die of a metal die, a plurality of layers of unidirectional carbon fiber prepregs which are cut and blanked are paved layer by layer according to a preset paving structure, wherein the preset paving structure is [0 °/+/-5 °/0 °] s Or [ + -5 °] s ；
In an upper die of a metal die, a plurality of layers of unidirectional carbon fiber prepregs are paved and stuck layer by layer according to a symmetrical structure.
4. The process for manufacturing the high-heat-conductivity integrated C/C radiating fin according to claim 1, wherein in S2, the high-carbon resin adhesive film is made of phenolic resin or modified benzoxazine resin with the mass ratio of (85-90): (10-15) and Ti-Zr-Ni-Cu alloy powder, and the surface density of the resin adhesive film is 50g/m 2 -100g/m 2 。
5. The process for manufacturing the integrated C/C heat dissipating fin of claim 1, wherein in S4, the compression molding process or the autoclave molding process is used for the curing molding.
6. The process for machining the high-heat-conductivity integrated C/C radiating fins according to claim 1, wherein in S5, the graphite tooling and the integrated fin CFRP blank forming metal mold have the same structural dimension.
7. The process for machining the high-heat-conductivity integrated C/C heat dissipation fin according to claim 1, wherein in S5, the specific process of carbonization is as follows:
transferring the CFRP blank of the integrated fin to a graphite tool, and then placing the CFRP blank into a carbonization furnace; after argon is filled into the carbonization furnace, heating is started, the temperature is raised to 1000-1200 ℃, the heat is preserved for 6-8 hours, and the carbonization furnace is cooled to the room temperature along with the furnace;
in the heating process, the heat preservation treatment is carried out in stages, and the temperature is continuously raised according to the heating speed after the heat preservation.
8. The process for manufacturing the high-heat-conductivity integrated C/C heat dissipation fin according to claim 1, wherein in S6, the densification process comprises the following specific steps:
putting the integrated C/C fin into a CVI deposition furnace, and introducing C into the furnace body 3 H 6 Is a carbon source gas, N 2 For diluting the gas, C 3 H 6 And N 2 The volume ratio of (2) is 3:1; the deposition temperature is 950 ℃ to 1100 ℃, and the furnace pressure is less than 1kPa; the deposition time is 150-200h.
9. A high thermal conductivity integrated C/C heat sink fin obtained by the high thermal conductivity integrated C/C heat sink fin processing process of any one of claims 1 to 8.
10. The high-heat-conductivity integrated C/C radiating fin according to claim 9, comprising a high-heat-conductivity C/C fin (1) and a metal Ti tube (2), wherein the high-heat-conductivity C/C fin (1) and the metal Ti tube (2) are combined and connected to form a non-fully-enclosed structure, an adhesion transition layer (3) is arranged between the high-heat-conductivity C/C fin (1) and the metal Ti tube (2), and the high-heat-conductivity C/C fin (1) is of a double-sided symmetrical structure.
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| CN117697423B (en) * | 2023-12-19 | 2024-05-31 | 沧州凯阳机电设备科技有限公司 | Radiator welding device |
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