CN115872766B - Preparation method of carbon-carbon material heat preservation device and heat preservation device - Google Patents
Preparation method of carbon-carbon material heat preservation device and heat preservation device Download PDFInfo
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Abstract
The application discloses the technical field of manufacturing of heat preservation devices, and particularly relates to a preparation method of a carbon-carbon material heat preservation device and the heat preservation device. The preparation method comprises the following steps: providing an end blank; providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is raised to 150-300 ℃ and is kept for 2-5 hours; and bonding the end green body and the middle green body to obtain the heat preservation device. Before carbonization and chemical vapor deposition, the thermal air pressure molding fully improves the strength uniformity and thickness uniformity of the material, so that the prepared heat preservation device has high and uniform strength and is not easy to damage; fiber reinforcement can be added into the prefabricated blank, so that the thermal shock resistance is improved, and the heat resistance and heat preservation performance are improved.
Description
Technical Field
The application belongs to the technical field of manufacturing of heat preservation devices, and particularly relates to a preparation method of a carbon-carbon material heat preservation device and the heat preservation device.
Background
In the prior art, the crystal growth process requires the use of thermal field components, the performance of which directly affects the crystal growth. For example, a thermal barrel is an important thermal field component for raw material melting during crystal growth.
The existing single crystal furnace body is large in size, the heat preservation barrel is large in size, the equipment for producing the heat preservation barrel is large in size, the cost and the requirement of the equipment for producing the heat preservation barrel are gradually increased, the utilization rate of the furnace body is low, and the production cost is high.
On the other hand, the size of the traditional heat-preserving cylinder is difficult to control due to the braiding process, so that a large amount of machining allowance is needed, and the actual utilization rate of the braiding body and the heat-preserving cylinder is only 50-70%.
Disclosure of Invention
The embodiment of the application provides a preparation method of a carbon-carbon material heat preservation device and the heat preservation device, and aims to provide a preparation method of the heat preservation device with more excellent performance and lower cost.
In one aspect, the present application provides a method for preparing a carbon-carbon material thermal insulation device, including:
providing an end blank;
providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is raised to 150-300 ℃ and is kept for 2-5 hours;
and bonding the end green body and the middle green body to obtain the heat preservation device.
Optionally, the components of the curing impregnant include phenolic resin, furfural resin, or a combination thereof;
the curing impregnant also comprises graphite powder and alcohol.
Optionally, the initial pressure of the hot air compression molding is 0.5MPA-9MPA; and/or the number of the groups of groups,
the temperature rising speed of the hot air compression molding is 10-20 ℃/min.
Optionally, the carbonization temperature is 900-1200 ℃ and the carbonization time is 2-10h.
Optionally, the density after carbonization is 0.8-1.2 g/cm.
Optionally, the temperature of the first chemical vapor deposition is 1000-1200 ℃, and the furnace pressure of the first chemical vapor deposition is 3000-5000pa.
Optionally, the density after the first chemical vapor deposition is 1.3-1.5 g/cm.
Optionally, the temperature of the heat treatment is 1500-2000 ℃, and the time of the heat treatment is 5-10 h.
Optionally, the temperature of the second chemical vapor deposition is 1100-1200 ℃, and the furnace pressure of the second chemical vapor deposition is 500-1000pa.
In a second aspect, the present application provides a spliced thermal insulation device resulting from the method of making of the first aspect.
According to the preparation method of the carbon-carbon material heat preservation device, the middle blank of the end blank is formed by bonding, waste of traditional materials is avoided, the utilization rate is only 50-70%, and the utilization rate of the heat preservation device material prepared by the method reaches more than 85%. Providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is raised to 150-300 ℃ and is kept for 2-5 hours; before carbonization and chemical vapor deposition, the thermal air pressure molding fully improves the strength uniformity and thickness uniformity of the material, so that the prepared heat preservation device has high and uniform strength, is not easy to damage and is about 10 times of graphite; fiber reinforcement can be added into the prefabricated blank, so that the thermal shock resistance is improved, and the heat resistance and heat preservation performance are improved; the structure is special and is not easy to deform because the structure is formed by segmented processing and splicing: absorbs thermal stress and reduces thermal deformation, thereby improving thermal creep resistance.
Drawings
Fig. 1 is a schematic flow chart of a preparation method of a carbon-carbon material heat insulation device according to an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are described in detail below, and in order to make the objects, technical solutions, and advantages of the present application more apparent, the present application is described in further detail below in connection with particular embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
Preparation method of carbon-carbon material heat preservation device
The first aspect of the present application provides a method for preparing a carbon-carbon material heat insulation device, as shown in fig. 1, including:
s1, providing an end blank;
in this embodiment, the end blank may be vapor deposited, carbonized, high temperature, process set, and vapor deposited from an end preform.
S2, providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is increased to 150-300 ℃ and is kept for 2-5 hours;
in this embodiment, the prefabricated blank may be formed by alternately laminating and needling a mesh made of carbon fibers, carbon cloth and carbon fiber filaments into a desired size, or may be formed by mechanically pressing a straight plate into an arc shape. The shape of the prefabricated blank is not limited, and can be a straight plate shape, an arc shape and the like, and can be adjusted according to the target shape of the heat preservation device and the convenience of subsequent processing procedures.
S3, bonding the end blank body and the middle blank body to obtain the heat preservation device.
In this embodiment, the whole heat preservation device can be obtained by bonding by sewing or the like, and immersing, vapor depositing, and carbonizing the bonded portion. The end green body and the middle green body can be sewn to the inner layer needled felt through quartz fiber threads; and then using the impregnating solution to perform semi-curing impregnation, and finally co-curing and compounding with other processes.
According to the embodiment of the application, the middle blank of the end blank is formed by bonding, so that the waste of traditional materials is avoided, the utilization rate is only 50-70%, and the utilization rate of the material of the heat preservation device manufactured by the method of the application is more than 85%. Providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is raised to 150-300 ℃ and is kept for 2-5 hours; before carbonization and chemical vapor deposition, the thermal air pressure molding fully improves the strength uniformity and thickness uniformity of the material, so that the prepared heat preservation device has high and uniform strength, is not easy to damage and is about 10 times of graphite; the structure is special and is not easy to deform because the structure is formed by segmented processing and splicing: absorbs thermal stress and reduces thermal deformation, thereby improving thermal creep resistance.
In some embodiments, fibrous reinforcement may also be added to the preform. Has the functions of improving the thermal shock resistance and the heat-resistant and heat-insulating performance.
In some embodiments, the components of the cure impregnant include phenolic resins, furfural resins, or combinations thereof. Phenolic resin and furfural resin can be filled in the gaps of the prefabricated blank body, so that the density and carbon content between heat preservation devices are improved, the crosslinking property of the heat preservation devices is improved, the heat preservation and high temperature resistance of the heat preservation devices are improved,
in some embodiments, the curing impregnant further includes graphite powder and alcohol. The graphite powder in the curing impregnant can increase the gaps filled in the prefabricated blank, and the alcohol can dissolve phenolic resin and furfural resin, so that the crosslinking and tuberculosis of the cured impregnant and the prefabricated blank at high temperature are improved.
In some embodiments, the initial pressure of the hot air compression molding is 0.5MPA-9MPA. The initial pressure is controlled in a lower range, so that oxygen during hot air pressure forming is removed, and the interference of reaction gases such as oxygen and the like can be avoided. Meanwhile, the air pressure forming effect is improved, and the uniformity of the blank body after air pressure forming is improved.
It should be noted that, after the prefabricated blank coated with the curing impregnant is put into the hot air pressure forming die, the hot air pressure forming die needs to be vacuumized before being put into the hot pressing furnace, so that the interference of reactive gases such as oxygen and the like can be avoided.
In some embodiments, the thermal compression molding is at a ramp rate of 10-20 ℃/min. The temperature rising speed of the air pressure forming is controlled, so that the uniformity of heating and the temperature uniformity of the whole blank body are kept, the uniformity of the structure in the thickness direction of the heat preservation device is promoted, and the uniform heat preservation and the uniform strength of the heat preservation device are improved. The uniformity of strength can be further improved, and the air tightness is stable.
In some embodiments, the carbonization is performed at a temperature of 900 ℃ to 1200 ℃ for a time of 2 to 10 hours. The carbonization temperature is controlled, so that the densification speed and the pyrolytic carbon structure can be adjusted, and the preset carbonization effect is achieved.
In some embodiments, the post-carbonization density is from 0.8 to 1.2 g/cm.
In some embodiments, the temperature of the first chemical vapor deposition is 1000 ℃ to 1200 ℃ and the furnace pressure of the first chemical vapor deposition is 3000pa to 5000pa. The densification speed and the pyrolytic carbon structure can be adjusted by controlling the temperature and the furnace pressure of vapor deposition.
In some embodiments, the first chemical vapor deposited density is from 1.3 to 1.5 g/cm.
In some embodiments, the temperature of the heat treatment is 1500 ℃ to 2000 ℃ and the time of the heat treatment is 5h to 10h. The density can be improved by controlling the temperature and the time of the heat treatment, so that the heat-resistant ceramic has higher strength and good air tightness.
In some embodiments, the temperature of the second chemical vapor deposition is 1100 ℃ to 1200 ℃ and the furnace pressure of the second chemical vapor deposition is 500pa to 1000pa. The densification speed and the pyrolytic carbon structure can be adjusted by controlling the temperature and the furnace pressure of vapor deposition, the density can be improved, and the high-strength high-tightness pyrolytic carbon has high air tightness.
Thermal insulation device
In a second aspect, the present application provides a spliced thermal insulation device resulting from the method of making of the first aspect. The heat preservation device of this application can be the heat preservation bucket of cylinder, cuboid shape's insulation can etc. can design as required.
The heat preservation device manufactured by the method is applied to a high-temperature furnace thermal field and has the characteristics of high strength, long service life, environmental protection, energy conservation and the like. Other transformation of the thermal field is not needed, and the adaptability is high; the thermal conductivity is about 1/2-1/5 of that of graphite. The bending strength is more than 130 MPa, and the heat conductivity coefficient is 4-10W/(m.k). In some embodiments, the density of the insulating device is 1.29-1.35 g/cm.
Examples
The following examples more particularly describe the disclosure of the present application, which are intended as illustrative only, since numerous modifications and variations within the scope of the disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
The phenolic resin is ZL3000 model of Xilan-Yue biotechnology Co.
Example 1
The embodiment provides a preparation method of a carbon-carbon material heat preservation device, which comprises the following steps:
providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is raised to 200 ℃ and is kept for 3 hours;
the middle blank body is arc-shaped, and the process is as follows:
1) Preparing a curing impregnant: the phenolic resin, the graphite powder and the alcohol are mixed and stirred according to the proportion, the stirring process is that the resin and the alcohol are firstly mixed and stirred uniformly according to the proportion of 8:1, the stirring is carried out for thirty minutes, the proportion of the graphite powder is 4:1 of the resin, the graphite powder is added into the prepared resin and alcohol for three times, and each time is separated by 30 minutes. The stirring speed is 1-5 r/s, and the stirring is carried out for 12-24h.
2) Preparing a prefabricated blank: the straight plate (uncured) is pressed into an arc shape at normal temperature by a mechanical press. The process uses a small pressure, but presses the straight plate into a generally similar shape, and no compression occurs.
3) Uniformly coating the surface of the cold-pressed preform body with the configured curing impregnant, wherein the coating thickness is 3mm.
4) After being smeared, the arc-shaped plate is placed into a polyether ketone plastic bag, and is placed into an air pressure die after being vacuumized.
5) And (3) putting the die into a hot pressing furnace, slowly boosting the pressure to 6MPA, slowly heating the die to 200 ℃ after the pressure reaches the specified parameters, and preserving the heat for 3.5 hours.
6) Slowly cooling, discharging from the furnace, and locking the mold.
7) And (3) putting the pressed mould and the product into a carbonization furnace, slowly heating to 1000 ℃ for 8 hours, carbonizing, and ensuring that the density reaches between 1.0g/cm after the carbonized product is discharged out of the furnace.
8) The carbonized product is subjected to chemical vapor deposition (CVI) at 1100 ℃ under 4000pa of furnace pressure, and the density after discharging reaches 1.4.
9) High temperature treatment: the temperature is 1800 ℃ and the time period is 7 hours.
10 Processing and shaping: machined to a specified shape.
11 CVI), temperature 1150 ℃, furnace pressure 800pa.
Providing an end blank; wherein, the end blank is an arc section blank, and the process is as follows:
1) And carrying out chemical vapor deposition on the circular arc segment prefabricated blank, wherein the temperature is 1100 ℃, the furnace pressure is 4000pa, and the density reaches between 0.85 after discharging.
2) Post-dipping: asphalt impregnation is adopted. And previous product types
3) Carbon is carried out: slowly heating to 1100 ℃ for 8 hours, carbonizing, and enabling the density to reach 1.4g/cm after the carbonized material is discharged out of the furnace.
4) High temperature treatment: the temperature is 1800 ℃ and the time period is 7 hours.
5) And (5) processing and shaping, and processing to a specified shape by using a machine.
6) Chemical vapor deposition was carried out at 1150℃under a furnace pressure of 700Pa with a density of 1.30 g/cm. And bonding the end green body and the middle green body to obtain the heat-preserving barrel.
Example 2
The embodiment provides a preparation method of a carbon-carbon material heat preservation device, which comprises the following steps:
providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is raised to 150 ℃ and is kept for 2 hours;
the middle blank body is arc-shaped, and the process is as follows:
1) Preparing a curing impregnant: the phenolic resin, the graphite powder and the alcohol are mixed and stirred according to the proportion, the stirring process is that the resin and the alcohol are firstly mixed and stirred uniformly according to the proportion of 8:1, the stirring is carried out for thirty minutes, the proportion of the graphite powder is 4:1 of the resin, the graphite powder is added into the prepared resin and alcohol for three times, and each time is separated by 30 minutes. The stirring speed is 1-5 r/s, and the stirring is carried out for 12-24h.
2) Preparing a prefabricated blank: the straight plate (uncured) is pressed into an arc shape at normal temperature by a mechanical press. The process uses a small pressure, but presses the straight plate into a generally similar shape, and no compression occurs.
3) Uniformly coating the surface of the cold-pressed preform with the prepared curing impregnant, wherein the coating is 1-5mm.
4) After being smeared, the arc-shaped plate is placed into a polyether ketone plastic bag, and is placed into an air pressure die after being vacuumized.
5) And (3) putting the die into a hot pressing furnace, slowly boosting the pressure to 0.5MPA, slowly heating the die to 150 ℃ after the pressure reaches the specified parameters, and preserving the heat for 2 hours.
6) Slowly cooling, discharging from the furnace, and locking the mold.
7) And (3) putting the pressed mould and the product into a carbonization furnace, slowly heating to 900 ℃ for 4 hours, carbonizing, and discharging the carbonized product until the density reaches between 0.8 g/cm.
8) And (3) performing chemical vapor deposition (CVI) on the carbonized product, wherein the temperature is 1000 ℃, the furnace pressure is 3000pa, and the density reaches 1.3g/cm after discharging.
9) High temperature treatment: the temperature is 1500 ℃ and the duration is 5 hours.
10 Processing and shaping: machined to a specified shape.
11 CVI), temperature 1100 ℃, furnace pressure 500pa.
Providing an end blank; wherein, the end blank is an arc section blank, and the process is as follows:
1) And (3) carrying out chemical vapor deposition on the circular arc segment prefabricated blank, wherein the temperature is 1000 ℃, the furnace pressure is 3000pa, and the density reaches 0.7g/cm after discharging.
2) Post-dipping: asphalt impregnation is adopted. And previous product types
3) Carbon is carried out: slowly heating to 900 ℃ for 2 hours, carbonizing, and discharging the carbonized material to a density of 1.3 g/cm.
4) High temperature treatment: the temperature is 1500 ℃ and the duration is 5 hours.
5) And (5) processing and shaping, and processing to a specified shape by using a machine.
6) Chemical vapor deposition is carried out at 1100 ℃ under a furnace pressure of 500pa and a density of 1.295 g/cm.
And bonding the end green body and the middle green body to obtain the heat-preserving barrel.
Otherwise, the same as in example 1 was conducted.
Example 3
The embodiment provides a preparation method of a carbon-carbon material heat preservation device, which comprises the following steps:
providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant, and the hot air compression molding is performed in a closed environment, and the temperature is raised to 300 ℃ and is kept for 5 hours;
the middle blank body is arc-shaped, and the process is as follows:
1) Preparing a curing impregnant: the phenolic resin, the graphite powder and the alcohol are mixed and stirred according to the proportion, the stirring process is that the resin and the alcohol are firstly mixed and stirred uniformly according to the proportion of 8:1, the stirring is carried out for thirty minutes, the proportion of the graphite powder is 4:1 of the resin, the graphite powder is added into the prepared resin and alcohol for three times, and each time is separated by 30 minutes. The stirring speed is 1-5 r/s, and the stirring is carried out for 12-24h.
2) Preparing a prefabricated blank: the straight plate (uncured) is pressed into an arc shape at normal temperature by a mechanical press. The process uses a small pressure, but presses the straight plate into a generally similar shape, and no compression occurs.
3) Uniformly coating the surface of the cold-pressed preform with the prepared curing impregnant, wherein the coating is 1-5mm.
4) After being smeared, the arc-shaped plate is placed into a polyether ketone plastic bag, and is placed into an air pressure die after being vacuumized.
5) And (3) putting the die into a hot pressing furnace, slowly boosting the pressure to 9MPA, slowly heating the die to 300 ℃ after the pressure reaches the specified parameters, and preserving the heat for 5 hours.
6) Slowly cooling, discharging from the furnace, and locking the mold.
7) And (3) putting the pressed mould and the product into a carbonization furnace, slowly heating to 1200 ℃ for 2-10h, carbonizing, and enabling the density to reach 1.2g/cm after the carbonized product is discharged out of the furnace.
8) And (3) performing chemical vapor deposition (CVI) on the carbonized product, wherein the temperature is 1200 ℃, the furnace pressure is 5000pa, and the density reaches 1.5g/cm after discharging.
9) High temperature treatment: the temperature is 2000 ℃ and the duration is 10 hours.
10 Processing and shaping: machined to a specified shape.
11 CVI), temperature 1200 ℃, furnace pressure 1000pa.
Providing an end blank; wherein, the end blank is an arc section blank, and the process is as follows:
1) And (3) carrying out chemical vapor deposition on the arc-segment prefabricated blank, wherein the temperature is 1200 ℃, the furnace pressure is 5000pa, and the density reaches 1.0g/cm after discharging.
2) Post-dipping: asphalt impregnation is adopted. And previous product types
3) Carbon is carried out: slowly heating to 900-1200 deg.C for 2-10 hr, carbonizing to obtain carbonized material with density of 1.5 g/cm.
4) High temperature treatment: the temperature is 2000 ℃ and the duration is 10 hours.
5) And (5) processing and shaping, and processing to a specified shape by using a machine.
6) Chemical vapor deposition was carried out at 1200℃under a furnace pressure of 1000Pa with a density of 1.31 g/cm.
And bonding the end green body and the middle green body to obtain the heat-preserving barrel.
Otherwise, the same as in example 1 was conducted.
Comparative example 1
The prefabricated blank is directly manufactured into the shape of a preset heat-preserving barrel, and conventional vapor deposition and carbonization are carried out, and the same method as in example 1 is adopted.
Performance testing
Using a method of density and concentration measurement Li Xinghua to detect the density of 5 parts at the middle end of the heat-preserving barrel and obtaining an average value;
using a GB/T34559-2017 carbon/carbon composite material compression performance test method to detect bending strength of 5 parts at the middle end of the heat-preserving barrel, and taking an average value;
the method for testing the compression performance of the GB/T34559-2017 carbon/carbon composite material is used for detecting the uniformity of the strength, and the uniformity is regarded as non-uniform when the strength difference is greater than 8 Mpa.
And 5 parts at the middle end of the heat preservation barrel are subjected to heat conductivity coefficient detection by using a GB/T8722-2019 method, and an average value is obtained.
The binders of examples 1-3 and comparative examples 1-2 were tested, and the test structures are shown in Table 3.
| Project | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Density g/cm | 1.68 | 1.70 | 1.69 | 1.61 |
| Flexural Strength MPa | 1452 | 1451 | 1456 | 1328 |
| Uniformity of flexural strength | Uniformity of | Uniformity of | Uniformity of | Non-uniformity of |
| Thermal conductivity W/(m.k) | 5 | 6 | 5.8 | 23 |
The heat preservation device has the density of more than 1.65g/cm, the bending strength of more than 1450MPa, the heat conductivity coefficient of 4-10W/(m.k), the strength of more uniform and the heat preservation performance of better.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be different from the order in the embodiments, or several steps may be performed simultaneously.
In the foregoing, only the specific embodiments of the present application are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, which are intended to be included in the scope of the present application.
Claims (6)
1. A preparation method of a carbon-carbon material heat preservation device comprises the following steps:
providing an end blank;
providing a middle blank body, wherein the middle blank body is formed by hot air compression molding, carbonization, first chemical vapor deposition, heat treatment, processing shaping and second chemical vapor deposition after the prefabricated blank body is impregnated by a curing impregnant; the temperature of the first chemical vapor deposition is 1000-1200 ℃, and the furnace pressure of the first chemical vapor deposition is 3000-5000pa; the temperature of the heat treatment is 1500-2000 ℃, and the time of the heat treatment is 5-10 h; the temperature of the second chemical vapor deposition is 1100-1200 ℃, and the furnace pressure of the second chemical vapor deposition is 500-1000pa; the components of the curing impregnant comprise phenolic resin, furfural resin or a combination thereof;
bonding the end green body and the middle green body to obtain the heat preservation device;
wherein, hot air compression molding specifically is: soaking, placing into a polyether ketone plastic bag, vacuumizing, placing into an air pressure mould, loading the mould, placing into a hot pressing furnace, slowly boosting the pressure to 0.5MPA-9MPA, slowly raising the temperature to 150-300 ℃ after the pressure is reached, and preserving the heat for 2-5 hours; slowly cooling, discharging and locking the die; wherein the temperature rising speed of hot air compression molding is 10-20 ℃/min;
the carbonization process comprises the following steps: putting the pressed mould and the product into a carbonization furnace together for carbonization;
the bending strength of the heat preservation device is larger than 1450MPa, and the heat conduction coefficient of the heat preservation device is 4-6W/(m.k).
2. The method of claim 1, wherein the curing impregnant further comprises graphite powder and alcohol.
3. The method according to claim 1, wherein the carbonization is carried out at a temperature of 900 ℃ to 1200 ℃ for a time of 2 to 10 hours.
4. The method according to claim 1, wherein the post-carbonization density is 0.8-1.2 g/cm.
5. The method of claim 1, wherein the first chemical vapor deposition post-deposition density is 1.3-1.5 g/cm.
6. A spliced thermal insulation device obtainable by the method of any one of claims 1-5.
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