JP2000007454A - Method for packing pyrolytic carbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pack pyrolytic carbon up to the center part of a porous base body such as a carbon fiber formed body without causing any ununiformity of the density in a relatively short time. SOLUTION: A liquid organic material 7 is sprayed from a nozzle 5 to be brought into contact with the carbon fiber formed body 2 while heating the carbon fiber formed body 2 of the porous body to be 1300 deg.C in the center part temp. by a high frequency induction heating coil. The temp. of the surface part of the carbon fiber formed body 2 is made lower than that of the center part by vaporizing the organic material 7 to take heat away from the surface of the carbon fiber formed body 7. Then, the gaseous organic material vaporizing on the surface of the carbon fiber formed body 7 does not cause very much pyrolysis in the vicinity of the surface to easily diffuse toward the center part and rapidly pyrolyzed in the center part having relatively high temp. As a result, the carbon fiber formed body 2 is filled with the pyrolytic carbon successively from the center part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling pyrolytic carbon, and more particularly to a method for filling pyrolytic carbon into a porous substrate such as a carbon fiber molded body, which can be rapidly and uniformly filled. It relates to a filling method.

[0002]

2. Description of the Related Art As one type of carbon composite material, carbon fiber reinforced carbon composite material (Carbon Fiber Reinforced Carbon Composite) is used.
posite: C / C) is known. Carbon fiber reinforced carbon composite material, which is a composite material using carbon fiber as a filler and carbon as a matrix, has the characteristics of superior thermal shock resistance, light weight and high mechanical strength compared to artificial graphite material. I have. Accordingly, carbon fiber reinforced carbon composite materials are used for crucibles, inner shields, heaters used in vacuum furnaces and atmosphere furnaces, shelf plates, bolts, trays, and other furnace components used in single crystal pulling CZ furnaces, hot press molds, It is widely used for throat parts of rocket nozzles and brake materials for aircraft and high-speed vehicles.

A method for producing a carbon composite material such as a carbon fiber reinforced carbon composite material includes a method of impregnating a thermosetting resin or pitch such as a phenol resin or a furan resin or a pitch into a porous substrate and then carbonizing the porous substrate by heating. , A resin impregnation method) and a method in which a porous substrate is continuously heated in an organic gas such as methane or propane, and organic substances diffused from the surface of the substrate to the inside are thermally decomposed and carbonized inside the substrate (hereinafter referred to as chemical). (Referred to as vapor phase deposition method).

[0004]

In the resin impregnation method, the weight of the resin or pitch impregnated in the porous substrate is lost by 40 to 50% during the heating and carbonizing process. Therefore, the impregnation firing step is
Unless repeated up to 4 times, the bulk density is 1.6 g / cm
^The required strength cannot be obtained because it does not exceed ³ . Further, in the resin impregnation method, if the temperature is rapidly increased in the carbonization step, the porous substrate may be broken by the pressure of the decomposition gas of the resin or the pitch, so the temperature must be gradually increased. Therefore, according to the resin impregnation method, a time of 3 to 4 weeks is required only for the impregnation and firing step.

[0005] The usual chemical vapor deposition method is methane,
In this method, a hydrocarbon gas such as propane is introduced into a high-temperature region and pyrolyzed to deposit pyrolytic carbon on the surface of the substrate. The surface temperature of the substrate is substantially the same as the temperature near the center. By utilizing this chemical vapor deposition method, the porous substrate can be filled with pyrolytic carbon, but when the temperature of the porous substrate is considerably higher than the thermal decomposition starting temperature of the organic substance, the gas of the organic substance becomes Since pyrolysis occurs near the surface of the porous substrate to close the pores, pyrolytic carbon is deposited only near the surface. In other words, since the organic gas does not diffuse into the inside of the porous substrate, pyrolytic carbon is not deposited in the vicinity of the central portion, and density unevenness occurs between the surface portion and the central portion of the porous substrate. Will be.

Therefore, in the ordinary chemical vapor deposition method, the temperature of the porous substrate is set near the thermal decomposition start temperature of the organic substance, and the state is maintained for a very long time, so that the porous substrate can reach the center of the porous substrate. Organic gas is allowed to diffuse. Therefore, for example, 500 to fill the pyrolytic carbon.
A long time that exceeds the time is required.

Accordingly, a main object of the present invention is to provide a method for filling pyrolytic carbon, which can uniformly fill a central portion of a porous substrate with pyrolytic carbon even in a relatively short period of time. That is.

[0008]

According to a first aspect of the present invention, there is provided a method for filling pyrolytic carbon, comprising: contacting a liquid organic substance with the porous substrate while heating the porous substrate;
It is characterized in that carbon caused by the organic matter thermally decomposed by the heat of the porous substrate is filled in the porous substrate. In this method, the liquid organic substance functions as a carbon source of pyrolytic carbon and also functions as a coolant for the surface of the porous substrate. According to this method, the liquid organic substance in contact with the porous substrate is heated and evaporated, so that the amount of heat corresponding to the heat of evaporation of the organic substance is taken from the surface of the porous substrate. Therefore, the surface of the porous substrate is cooled, and the temperature of the surface is lower than that of the center.

As described above, since a temperature gradient is forcibly formed between the surface portion and the center portion of the porous substrate, the organic gas evaporated on the surface portion of the porous substrate is not thermally decomposed in the vicinity of the surface. Don't wake up. As a result, the organic gas easily diffuses toward the center of the substrate, is rapidly pyrolyzed in the relatively high temperature center, and the deposition of carbon starts, so that the substrate moves from the center to the pyrolytic carbon. To be filled. That is, since the deposition of pyrolytic carbon proceeds from the center of the porous substrate toward the surface, the pores are not closed before the center is filled. Therefore, the central portion and the surface portion of the porous substrate can be filled with pyrolytic carbon without causing uneven density at the central portion and the surface portion of the porous substrate. In the present invention, the liquid organic substance does not necessarily need to be brought into contact with the entire surface of the porous substrate, but may be brought into contact with only a desired portion.

Further, according to this method, it is not necessary to set the temperature of the substrate near the starting temperature of thermal decomposition of the organic substance and maintain that state for a long time as in the ordinary chemical vapor deposition method. Since it is not necessary to perform the impregnation firing process three to four times at a moderate temperature as described above, the porous substrate can be filled with the pyrolytic carbon in a relatively short time. Further, according to this method, it is possible to make the carbon filling rate of all portions of the porous substrate substantially uniform by bringing the liquid organic substance into uniform contact with the porous substrate.

According to the first aspect of the present invention, as the amount of the organic substance brought into contact with the porous substrate increases, the temperature of the substrate surface decreases, and the porous substrate is filled with pyrolytic carbon to a deeper portion inside the substrate. Tend to be. Conversely, as the amount of organic matter contacting the porous substrate is reduced, the porous substrate tends to fill only a shallower portion of its interior. Therefore, in order to fill the central portion and the surface portion of the substrate with pyrolytic carbon without uneven density according to the present invention, the organic substance to be brought into contact with the porous substrate until the central portion of the porous substrate is filled with pyrolytic carbon. It is preferable to increase the amount and to reduce the amount of organic matter after the center of the porous substrate is filled with pyrolytic carbon.

The organic substance that can be used in the method of the first aspect is not particularly limited as long as it can be made into a liquid by heating or cooling, but is preferably liquid at room temperature in terms of handling. Examples of the organic substance that can be used in the invention of claim 1 include benzene (heat of evaporation: 31.7 kJ / mol) and toluene (33.5 kJ / mol).
J / mol), xylene (36.1-36.8 kJ /
mol) and pentane (25.8
kJ / mol), hexane (28.9 kJ / mol)
Such as methane-based hydrocarbons and acetone (29.0 kJ /
mol), methyl ethyl ketone (31.7 kJ / mo)
l) and the like, and diethyl ether (2)
6.0 kJ / mol), diisopropyl ether (2
Ethers such as 9.2 kJ / mol), but are not limited thereto. In addition, as a component of the organic substance, a substance composed of only carbon and hydrogen is most preferable. That is, when the amount of components other than carbon in the organic substance increases, the utilization efficiency of the organic substance decreases.

An example of the porous substrate that can be used in the method of claim 1 is a carbon fiber molded body, but is not limited thereto. For example, tungsten (W)
A molded body knitted with a thin wire of molybdenum (Mo) or molybdenum (Mo) can also be used as the porous substrate.

In the method of the first aspect, the porous substrate may be heated by, for example, an induction heating method using an induction heating coil or the like. Any one or more of known heating methods such as an energization method can be used.

According to the first aspect of the present invention, the organic substance brought into contact with the substrate has a heat of evaporation of 60 kJ / mol.
The following is preferred. This is because when the heat of evaporation of the organic substance exceeds 60 kJ / mol, the organic substance tends to thermally decompose and deposit carbon while remaining on the surface of the porous substrate, so that the center of the substrate is difficult to be filled with carbon. is there. In the first aspect of the present invention, a practically particularly desirable range of the heat of evaporation of the organic matter is 20 kJ / mol or more and 40 kJ / mol or more.
J / mol or less.

According to the first aspect of the present invention, at least one of a droplet and a liquid stream of an organic substance may be sprayed on the porous substrate in order to bring the organic substance into contact with the porous substrate. Nozzles can be used. By using a nozzle, a liquid organic substance can be sprayed on a porous substrate as a mist or droplet-shaped shower, and the organic substance can be uniformly contacted over a wider area of the substrate, and the organic substance The contact amount can be freely controlled. Also,
When bringing the liquid organic substance into contact with the porous substrate, by rotating the substrate or moving the nozzle appropriately,
Since the relative position between the nozzle and the base is changed, it is possible to further reduce unevenness in the filling of the pyrolytic carbon and to spray an organic substance onto an arbitrary portion. Also,
In addition to the nozzle, for example, a hose can be used for spraying the liquid flow.

In the first aspect of the present invention, the porous substrate may be immersed in a liquid containing an organic substance in order to bring the organic substance into contact with the porous substrate. At this time, since a partial gaseous film is partially formed on the surface of the substrate due to the vaporization of the liquid, a partial filling unevenness may occur. On the other hand, by moving the porous substrate relatively (for example, stirring the liquid or rotating the substrate), uneven filling can be prevented.

In the first aspect of the present invention, it is preferable that the vicinity of the center of the porous substrate is heated to 500 ° C. to 2800 ° C. If the temperature in the vicinity of the center of the porous substrate is less than 500 ° C., the thermal decomposition rate is extremely slow, so that it takes an enormous processing time to complete the filling of the pyrolytic carbon and exceeds 2800 ° C. This is because the tendency of the vaporized organic substance gas to be thermally decomposed before reaching the center of the substrate becomes large, and it becomes difficult to fill the vicinity of the center with pyrolytic carbon. In the invention of claim 1, a practically suitable heating temperature in the vicinity of the center of the porous substrate is 80.
0 ° C to 2200 ° C.

In the porous substrate used in the first aspect of the present invention, the bulk density before filling is 10% or more of the true density and 90% or less.
% Or less (this is, for example,
For a molded article woven from carbon fibers having a true density of 1.80 g / cm ³ , a bulk density of 0.18 g / cm ³ or more and 1.
62 g / cm ³ or less). Because, when the bulk density is less than 10% of the true density, the electric resistance of the porous substrate is large and it is difficult to heat it by an electric means, and the filling rate at the initial stage of the reaction is low due to poor thermal conductivity, This is because it takes an enormous amount of time. On the other hand, if the bulk density exceeds 90% of the true density, there are few paths for the organic gas to diffuse into the inside of the substrate, and it is difficult to fill the center.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for filling pyrolytic carbon according to a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of an apparatus used for carrying out the method for filling pyrolytic carbon according to the first embodiment of the present invention. In FIG. 1, the inner diameter is 7.5 cm.
A porous substrate as a sample 2 having a substantially cubic shape is arranged in a reaction vessel 1 made of quartz glass having a cylindrical shape. The reaction vessel 1 is surrounded by a high-frequency induction heating coil 3. A thermocouple 4 for temperature measurement is arranged at the center of the sample 2. Also, on both sides of sample 2,
A pair of nozzles 5 facing each other are arranged. A large number of holes having a diameter of about 0.5 mm are provided on the opposing surface of the nozzle 5, and these holes can eject a liquid as a mist. An exhaust port 6 is provided at the bottom of the reaction vessel 1, and the exhaust inside the reaction vessel 1 and the introduction of an external gas can be performed through the exhaust port 6.

The nozzle 5 is connected to a tank 8 through a pipe 9, and the tank 8 stores a liquid organic substance 7. A pipe 9 connecting the nozzle 5 and the tank 8 is connected to a metering pump 10 for sending only a certain amount of liquid organic matter toward the nozzle 5.

In order to fill the porous substrate, which is the sample 2, with the pyrolytic carbon using the apparatus shown in FIG. 1, after the sample 2 processed into a desired shape is placed in the reaction vessel 1, the exhaust port 6 is turned on. The inside of the reaction vessel 1 is replaced with an inert gas through the reaction vessel. Thereafter, by energizing the high-frequency induction heating coil 3, the temperature of the central portion of the sample 2 is raised to a predetermined temperature. Then, a liquid organic substance 7 is sprayed toward the sample 2 from the two nozzles 5 while energizing the high-frequency induction heating coil 3 until the sample 2 is uniformly filled. After stopping the operation of the apparatus, the sample 2 taken out of the reaction vessel 1 is cooled.

By spraying the liquid organic substance 7 on the sample 2 and bringing it into contact with the sample 2, the liquid organic substance 7 contacting or adhering to the sample 2 is heated and evaporated, and the amount of heat corresponding to the heat of evaporation of the organic substance is reduced. Is taken from the surface of Therefore, the surface of the sample 2 is cooled, and the temperature of the surface of the sample 2 is lower than that of the center. The organic gas evaporated on the surface of the porous substrate sample 2 diffuses into the substrate without causing thermal decomposition in the vicinity of the surface, and is rapidly thermally decomposed in the central portion where the temperature is relatively high. . Therefore, the deposition of pyrolytic carbon starts from the center of the substrate and proceeds toward the surface. Therefore, according to the method of the present embodiment, it is possible to fill the pyrolytic carbon in a short time without causing uneven density at the center and the surface of the porous substrate.

Further, according to the method of the present embodiment, since the liquid organic substance 7 is sprayed on the sample 2 and brought into contact therewith, a gas film is partially formed on the surface of the substrate due to the vaporization of the liquid. As a result, there is almost no possibility of uneven filling of the pyrolytic carbon. Further, the apparatus used in the method of the present embodiment is relatively simple as compared with an apparatus for immersing a large-sized substrate in a liquid. Further, in the present embodiment, since the liquid organic substance 7 is sprayed on the sample 2 using the nozzle 5 to make contact therewith, the organic substance is applied to all parts of the sample 2 even when the shape of the sample 2 is complicated. It is possible to make contact. Therefore, the method of the present embodiment
It is also suitable for filling the deformed substrate with pyrolytic carbon.

Next, a second embodiment of the present invention will be described. FIG. 2 is a schematic diagram showing the configuration of an apparatus used to carry out the method for filling pyrolytic carbon according to the present embodiment. In FIG. 2, a porous substrate as a sample 12 having a substantially cubic shape is disposed in a reaction vessel 11 made of quartz glass having a cylindrical shape with an inner diameter of 7.5 cm.
The reaction vessel 11 is surrounded by a high-frequency induction heating coil 13. A thermocouple 14 for measuring temperature is arranged at the center of the sample 12. Also, below the sample 12, φ
A rotary stirrer 15 of about 25 mm is arranged.
The stirrer 15 can stir the liquid organic matter 17 stored in the reaction vessel 11 by rotating the four blades. Note that an exhaust port 16 is provided at the top of the reaction vessel 11, and the exhaust inside the reaction vessel 11 and the introduction of an external gas can be performed through the exhaust port 16.

A liquid organic substance inlet 11a provided at the bottom of the reaction vessel 11 is connected to a tank 18 via a pipe 19, and the tank 18 stores a liquid organic substance 17. A pipe 19 connecting the reaction vessel 11 and the tank 18 is connected to a metering pump 20 for sending only a certain amount of liquid organic matter toward the reaction vessel 11.

Using the apparatus shown in FIG.
In order to fill the porous substrate, the sample 12 processed into a desired shape is placed in the reaction vessel 11, and then the inside of the reaction vessel 11 is replaced with an inert gas (for example, argon) via the exhaust port 16. I do. Thereafter, the metering pump 20 is operated to store the liquid organic substance 17 in the reaction vessel 11 to a predetermined level. Then, by energizing the high-frequency induction heating coil 13, the temperature of the central portion of the sample 12 is raised to a predetermined temperature, and the stirrer 15 is rotated at a rotation speed of about 90 rotations / minute. Then, while energizing the high-frequency induction heating coil 13 until the sample 12 is uniformly filled, the reaction vessel 1 is operated by operating the stirrer 15 and the metering pump 20 to maintain the liquid organic substance 17 at a predetermined level.
Feed to 1. After stopping the operation of the apparatus, the sample 12 taken out of the reaction vessel 11 is cooled.

As described above, by immersing the sample 12 in the liquid organic substance 17 and bringing it into contact with the liquid organic substance 17, density unevenness occurs in the central portion and the surface portion of the porous substrate, as in the first embodiment. And it is possible to fill pyrolytic carbon in a short time.

Further, according to the method of the present embodiment, since the liquid organic substance 17 is stirred by the stirrer 15, a gas film is formed on a certain portion of the surface of the substrate due to the vaporization of the liquid. Also, it is less likely that a gas film exists in that portion for a long time. Therefore, uneven filling of the substrate surface can be prevented. Note that a mechanism such as rotating the sample 12 is provided in place of the stirrer 15 to
2 may be moved relatively to the liquid organic substance 17.

[0031]

EXAMPLE Next, an example in which a carbon fiber molded body is filled with pyrolytic carbon using the apparatus shown in FIG. 1 to produce a carbon fiber reinforced carbon composite material will be described. In addition, although the description is omitted here, even when the carbon fiber molded body is filled with the pyrolytic carbon using the apparatus shown in FIG. 2, the same results as in the following Examples 1 to 15 and Comparative Examples are obtained. Was.

Example 1 A carbon fiber molded body having a bulk density of 1.3 g / cm ³ (72% of the true density) was processed into a cubic shape having a side of 2.5 cm. It was left still in the center. Next, after the inside of the reaction vessel 1 was evacuated and replaced with argon gas, the high-frequency induction heating coil 3 was energized to perform induction heating of the sample 2 with high frequency from outside the reaction vessel 1. Then, the temperature at the center of the carbon fiber molded body is set to 1
While maintaining the temperature at 300 ° C., pentane (heat of evaporation of 25.8 kJ / mol) was sprayed onto the carbon fiber molded body from the two nozzles 5 at a rate of 120 ml / min in total of the two nozzles.

After 3 hours from the start of the supply of pentane, the supply amount was reduced to a rate of 30 ml / min, and then 30
Pentane was sprayed on the carbon fiber molded body for a minute. And
The heating of the carbon fiber molded body by the high frequency induction heating coil 3 and the spraying of pentane on the carbon fiber molded body were stopped. Next, after cooling the carbon fiber molded body, the bulk density was measured, and it was found that the carbon fiber molded body was uniformly filled with pyrolytic carbon from its surface to the center. The bulk density of the filled carbon fiber molded body was 1.8 g / cm ^3.
The density difference between the surface portion and the central portion was hardly observed. As described above, according to this example, it is possible to obtain a carbon fiber reinforced carbon composite material uniformly filled with pyrolytic carbon from the surface to the center of the carbon fiber molded body in a short time of less than 4 hours. Was. In addition, the carbon fiber reinforced carbon composite material obtained by this example was of the same quality as the carbon fiber reinforced carbon composite material obtained by the ordinary chemical vapor deposition method.

(Examples 2 to 6) The temperature at the center of the carbon fiber molded body was set to 800 ° C, 1800 ° C, 2100 ° C, and 2600 ° C.
° C and the supply time of pentane was changed accordingly, except that it was manufactured in the same process as in Example 1.
With respect to the carbon fiber reinforced carbon composite materials of Examples 2 to 6 having a bulk density of 1.8 g / cm ³ , the state of filling with pyrolytic carbon was observed. As a result, it was found that pyrolytic carbon was filled at almost the same density from the surface to the center.

(Examples 7 to 10) Toluene (heat of evaporation 33.5 kJ / mol) and xylene (36.
1-36.8 kJ / mol), hexane (28.9 kJ / mol)
J / mol) and acetone (29.0 kJ / mol) were sprayed, and the supply time of these liquid organic substances was changed accordingly. Examples 7 to 0.8 g / cm3
About 10 carbon fiber reinforced carbon composite materials, the state of filling with pyrolytic carbon was observed. As a result, it was found that pyrolytic carbon was filled at almost the same density from the surface to the center.

(Examples 11 to 15) The bulk density of the carbon fiber molded article was 0.2 g / cm ³ (11% of the true density), 0.6 g
/ Cm ³ (33%), 1.0 g / cm ³ (56
%) Was 1.6 g / cm ³ (89%), and the bulk density was 1.8 g, produced in the same process as in Example 1 except that the supply time of pentane was changed accordingly. /
With respect to the carbon fiber-reinforced carbon composite materials of Examples 11 to 15 having a size of cm ³ , the state of filling with pyrolytic carbon was observed. As a result, it was found that pyrolytic carbon was filled at almost the same density from the surface to the center.

(Comparative Example) In this comparative example, a heater (not shown) was connected to the pipe 9 on the discharge port side of the metering pump 10 of the apparatus shown in FIG.
And the heater evaporates all the pentane passing through the pipe, and sprays the pentane in a gaseous state on the carbon fiber molded body. First, a carbon fiber molded body having a bulk density of 1.3 g / cm ³ was processed into a cubic shape having a side of 2.5 cm, and this was placed as a sample 2 at the center of the reaction vessel 1. Next, the inside of the reaction vessel 1 was evacuated and replaced with argon gas.
The substrate was subjected to induction heating with high frequency from outside. Then, pentane vapor evaporated at a rate of 120 ml / min was supplied from the two nozzles 5 to the carbon fiber molded body while maintaining the temperature at the center of the carbon fiber molded body at 1300 ° C.

Three hours after the start of the supply of pentane vapor, the supply amount of liquid pentane was reduced to a rate of 30 ml / min, and then pentane vapor was applied to the carbon fiber molded body for another 30 minutes. Then, the heating of the carbon fiber molded body by the high frequency induction heating coil 3 and the blowing of pentane vapor to the carbon fiber molded body were stopped. Next, after cooling the carbon fiber molded body, when the bulk density was measured, the carbon fiber molded body was filled with pyrolytic carbon to a depth of 3 mm from the surface, and the bulk density of the surface portion was 1.8 g. / Cm ³ , but 3
The portion deeper than mm was not filled with pyrolytic carbon, and the bulk density remained 1.3 g / cm ³ . Therefore, the overall bulk density was 1.5 g / cm ³ .

[0039]

As described above, according to the present invention, by contacting a liquid organic substance with the porous substrate while heating the porous substrate, the organic substance caused by the thermal decomposition of the porous substrate has Since the carbon to be filled is filled in the porous substrate, the deposition of pyrolytic carbon proceeds from the center of the porous substrate toward the surface. In addition, according to this method, the temperature of the substrate is set to a temperature near the thermal decomposition start temperature of the organic substance and maintained for a long time as in a normal chemical vapor deposition method, or the temperature is gradually increased as in a resin impregnation method. 3
There is no need to perform up to four impregnation firing steps. Therefore, the central portion and the surface portion of the porous substrate can be filled with pyrolytic carbon in a short time without unevenness in density. For example, in order to fill a carbon fiber molded body having a bulk density of 1.3 g / cm ³ with pyrolytic carbon to make the whole bulk density 1.8 g / cm ³ , it takes 500 hours in a normal chemical vapor deposition method. Although it takes a long time, according to the present invention, it is possible to compress this to 4 hours or less. Further, the method of the present invention has an advantage that the carbon filling rate can be made substantially uniform in all parts of the porous substrate by uniformly contacting the liquid organic substance with the porous substrate.

Therefore, according to the present invention, energy can be saved, delivery time can be reduced, and cost can be significantly reduced, and the quality of the porous substrate filled with pyrolytic carbon can be greatly improved. It can greatly contribute to nuclear industry, semiconductor industry and space development industry.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an apparatus used to carry out a method for filling pyrolytic carbon according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of an apparatus used to carry out a method for filling pyrolytic carbon according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reaction container 2 Sample (porous base) 3 High frequency induction heating coil 4 Thermocouple 5 Nozzle 6 Exhaust port 7 Liquid organic matter 8 Tank 9 Piping 10 Metering pump

Claims (5)

[Claims] 1. A method in which a liquid organic substance is brought into contact with the porous substrate while heating the porous substrate, so that carbon caused by the organic substance thermally decomposed by the heat of the porous substrate is transferred to the porous substrate. A method for filling pyrolytic carbon, characterized by being filled. 2. The heat of evaporation of the organic substance is 60 kJ / mol.
The method for filling pyrolytic carbon according to claim 1, wherein: 3. The porous substrate according to claim 1, wherein at least one of a droplet and a liquid stream of the organic material is sprayed on the porous substrate to bring the organic material into contact with the porous substrate. Filling method of pyrolytic carbon. 4. The thermal decomposition according to claim 1, wherein the porous substrate is heated so that the temperature in the vicinity of the center thereof is 500 ° C. to 2800 ° C. How to fill carbon. 5. The method according to claim 1, wherein the bulk density of the porous substrate before filling with pyrolytic carbon is 10% to 90% of the true density. Filling method of pyrolytic carbon.