TWI504563B - Isotropic carbonaceous material and method of producing the same - Google Patents

Description

Isotropic carbonaceous material and method of producing the same

The present invention relates to an isotropic carbonaceous material and a method of producing the same, and more particularly to an isotropic carbonaceous material utilizing mesophase carbon microspheres without the addition of any binder and a method of making the same.

The carbonaceous material is mainly composed of carbon elements, and different carbon materials, such as amorphous carbon, graphite-based carbon, thermal decomposition carbon, and carbon fiber, can be obtained by different manufacturing methods. Among them, isotropic graphite materials have high temperature resistance, electrical conductivity, thermal conductivity, lubricity, porosity and corrosion resistance, and have recently been widely used in various industries such as metallurgy, machinery and semiconductors. The conventional isotropic graphite process generally uses coke as a raw material, is mixed with coal tar pitch, and then extruded into an in-mold, and then heated to about 1000 ° C under non-oxidizing conditions. Forming amorphous carbon with pores. After that, the impregnated asphalt and the re-baking are carried out several times to fill the holes. Subsequently, heat treatment is further applied to 2500 ° C to 3000 ° C to form amorphous carbon to form high density graphite.

In recent years, the rapid development of energy storage materials has led to a rapid increase in demand for directional graphite materials with high density, high strength, high purity and good processing properties. However, the conventional isotropic directional graphite process is complicated, and the quality of the obtained product often fails to meet the demand. Therefore, recently, it has been developed to utilize mesocarbon microbeads (MCMBs) having self-sintering, which do not require mixing, kneading, and pulverization, and do not need to be impregnated with asphalt and then By roasting and other procedures to fill the holes, high-strength, high-density, high-purity graphite carbon materials can be produced, which not only greatly improves the mechanical properties of graphite, but also simplifies the complicated production process of isotropic graphite. The above-mentioned processes and materials can be found in related documents, such as U.S. Patent Nos. 5,525,276, 5,547,654, 5,609,800, 4,929,404, and Taiwan Patent Publication Nos. TW 326027, TW 379202, TW424079, etc. References.

However, the above process of the graphite carbon material still has the following problems. For example, when the above process is used to form a green body by using mesocarbon microbeads, a large amount of volatile components are easily released during subsequent carbonization treatment, which causes a problem of cracks or cracks on the surface of the subsequently obtained carbon material. Secondly, if the above carbonization process is to be carried out under vacuum (for example, as described in the above-mentioned Taiwan patent), it will cause a substantial increase in mass production. If, in order to avoid the problem of the escape of volatile components during carbonization and graphitization, the rate of temperature increase of the carbonization process is slowed down, which will make the carbonization process longer and more energy-intensive.

In summary, the processing time of conventional directional graphite carbon materials is long and energy-consuming, and the surface of the obtained graphite carbon material is prone to cracks or even cracks, thereby limiting the scope of application thereof.

Therefore, there is a need to provide a method for producing an isotropic graphite carbon material to effectively solve the problem of cracks or defects on the surface of the graphite carbon material obtained by the conventional process.

Therefore, one aspect of the present invention provides a method for producing an isotropic carbonaceous material, which is obtained by molding a mesophase carbon microsphere without adding any binder into a green body by pulverization and cold equalization. The subsequent carbonization time can be shortened.

Secondly, another aspect of the present invention provides an isotropic carbonaceous material which is obtained by the above method, and the surface of the obtained isotropic carbonaceous material is intact and has no defects and has good mechanical properties. Thermal and electrical properties.

According to the above aspect of the invention, a method of producing an isotropic carbonaceous material is proposed. In one embodiment, the method for producing the directional carbonaceous materials is to first pulverize the mesophase carbon microspheres to form a pulverized powder, and then pulverize the pulverized powder without adding any binder by cold equalization method. To form a green body. Next, the green body is subjected to carbonization and graphitization to form an isotropic carbonaceous material.

In the above embodiment, the pulverizing step is such that the average particle diameter of the pulverized powder obtained by pulverizing the mesocarbon microbeads is from 1 μm to 10 μm, wherein the mesophase carbon microspheres have a toluene insoluble component. TI) and quinoline insoluble (QI), and the difference between TI and QI is 0.1% by weight (wt%) to 2.0 wt%.

In the above embodiment, the method of cold pressure etc, which system is applied to 500kg / cm ² to 3000kg / cm ² above the greater pressure molding the pulverized powder to form the green body. In other examples, the Department of the cold pressing method is applied etc 800kg / cm ² to 2000kg / cm ² above the molding pressure of greater pulverized powder.

After the green body is formed, the green body is then subjected to carbonization and graphitization in the presence of a protective atmosphere to form an isotropic carbonaceous material. In one example, each of the surfaces of the isotropic carbonaceous material is intact and has no cracks, and the difference between the thermal expansion coefficients of the X-axis, the Y-axis, and the Z-axis is less than 10%.

According to an embodiment of the present invention, the pulverized powder has an average particle diameter of from 3 μm to 8 μm.

According to an embodiment of the invention, the difference between the TI and the QI is 0.2 wt% to 2.0 wt%.

According to an embodiment of the invention, the protective atmosphere for the carbonization and graphitization of the green body is nitrogen, argon, helium or any combination thereof.

According to another aspect of the present invention, an isotropic carbonaceous material is produced which is produced by the above-described method for producing an isotropic carbonaceous material, wherein the obtained isotropic carbonaceous material has 1.75 g/cm. A density of ³ to 1.95 g/cm ³ and a hardness of 50 to 90.

The isotropic carbonaceous material of the present invention and a method for producing the same, which are capable of shortening subsequent carbonization treatment by molding a mesophase carbon microsphere without adding any binder by pulverization and cold equalization to form a green body The time and the surface of the obtained isotropic carbonaceous material are intact, defect-free and equidirectional, and have good mechanical, thermal and electrical properties.

Embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable inventive concepts that can be implemented in a wide variety of specific content. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.

The method for producing an isotropic carbonaceous material of the present invention can be obtained by the following method. Please refer to FIG. 1 , which is a partial flow chart showing a method of manufacturing an isotropic carbonaceous material according to an embodiment of the present invention. In one embodiment, first, as shown in step 101, the commercially available mesophase carbon micro is pulverized using, for example, a commercially available ball mill pulverizing apparatus, a gas-priming pulverizing apparatus, a jet pulverizing apparatus, or a high-pressure homogenizing apparatus. The balls are formed to form a pulverized powder having an average particle diameter (D ₅₀ ) of from 1 μm to 10 μm. In another example, the pulverized powder described above has an average particle diameter (D ₅₀ ) of from 3 μm to 8 μm. In still another example, the average particle diameter (D ₅₀ ) of the pulverized powder described above may be about 5 μm.

Here, it is explained that the pulverized powder of the present invention has an average particle diameter of from 1 μm to 10 μm or from 3 μm to 8 μm or 5 μm, contributing to formation of a dense green body. If the average particle size of the pulverized powder is too large, the formed green body tends to have large pores, thereby affecting the density of the directional carbonaceous material which is subsequently produced. If the average particle size of the pulverized powder is too small, the time and cost of the pulverization step are increased.

In general, mesophase carbon microbeads surface of the sphere with the amount of β - resin (β -resin), it has a good self-sintering properties, etc. After the cold pressing method for molding green, green body after carbonization, graphitization After the treatment, a high-density isotropic carbonaceous material can be prepared. The mesophase carbon microspheres have toluene insoluble (hereinafter referred to as TI) and quinoline insoluble (QI), and β -resin refers to insoluble in toluene but soluble in quinoline. The composition, therefore the content of β -resin is defined as the difference between TI and QI.

The β -resin content of the mesocarbon microbeads suitable for use in the present invention is extremely low. In one example, the difference between TI and QI is from 0.1 weight percent (wt%) to 2.0 wt%. In another example, the difference between TI and QI is from 0.2 wt% to 2.0 wt%. In yet another example, the difference between TI and QI is from 0.4 wt% to 2.0 wt%.

However, it is explained here that since the mesophase carbon microspheres used in the present invention have a very low β -resin content, the pulverized powder obtained therefrom can avoid the release of a large amount of volatile components in the subsequent carbonization and graphitization treatment. Further, the surface of the directional carbonaceous material obtained subsequently is solved, and there is no problem that the surface is incomplete without cracks or defects.

If the β -resin content is less than 0.1% by weight (wt%), the pulverized powder described above has poor self-sintering property in subsequent carbonization treatment, and it is not easy to form a complete isotropic carbonaceous material. . If the β -resin content is more than 2.0 wt%, the volatile components of the carbon microspheres overflow during the subsequent carbonization and graphitization treatment may cause the subsequent isotropic carbonaceous material to be easily cracked or cracked. problem.

Next, as shown in step 103, the above-mentioned pulverized powder to which no binder is added is molded by cold equalization to form a green body. Embodiment, the method of cold pressure etc lines to the pulverized powder was placed in a rubber mold of the application of 500kg / cm ² to 3000kg / cm ² of greater molding pressure of 1 to 10 minutes in this embodiment. In another example, the system of the cold pressing method is applied etc 800kg / cm ² to the pulverized powder to 2000kg / cm ² large molding pressure of up to 3-7 minutes

Then, as shown in step 105, the green body described above is subjected to carbonization treatment in the presence of a first protective atmosphere to form a carbonized material. In one example, the first protective atmosphere is nitrogen, argon, helium or any combination thereof. In another example, the aforementioned first protective atmosphere is nitrogen.

In step 105, the carbonization treatment described above heats the green body to a temperature of 900 ° C to 1100 ° C but does not hold the temperature at a first average heating rate of 5.0 ° C (° C / hr) to 8.0 ° C / hr per hour. In other examples, the carbonization treatment described above may also heat the green body to a temperature of 1000 ° C without holding the temperature at a first average rate of temperature increase of 6.0 ° C / hr to 7.0 ° C / hr.

Thereafter, as shown in step 107, the carbonized material described above is subjected to a graphitization treatment in the presence of a second protective atmosphere, thereby forming an isotropic carbonaceous material. In one example, the second protective atmosphere is nitrogen, argon, helium or any combination thereof.

In step 107, the foregoing graphitization treatment heats the aforementioned carbonized material to a temperature of 2500 ° C to 3000 ° C and a temperature of 30 minutes to 90 minutes at a second average heating rate of 5.0 ° C / min to 8.0 ° C / min. In another example, the foregoing graphite treatment heats the aforementioned carbonized material to a temperature of 2750 ° C and a temperature of 30 minutes to 90 minutes at a second average heating rate of 6.0 ° C / min to 7.0 ° C / min.

After the carbonization treatment and the graphitization treatment described above, or after the graphitization treatment, the temperature reduction step is more selectively performed. It is claimed that, between the foregoing carbonization treatment and graphitization treatment, the first natural temperature lowering step can be selectively performed, and the temperature of the aforementioned carbonized material is lowered to 25 at 45 hours to 50 hours without using any cooling equipment. °C to 40 °C.

Further, after the graphitization treatment, the second natural temperature lowering step can be selectively performed to lower the temperature of the aforementioned directional carbonaceous material to 25 ° C to 40 ° C without using any cooling equipment. The first natural cooling step and/or the second natural cooling step are performed to make the obtained isotropic carbonaceous material more dense and the surface intact without defects.

It is to be noted that the term "isotropic carbonaceous material" as used herein refers to a high-density graphite material obtained by the above method, the surface of which is intact and non-defective, and the directional carbonaceous material is on the X-axis. The difference between the thermal expansion coefficients of the Y-axis and the Z-axis is less than 10%, which means that it has a better isotropic property. Second, the directional carbonaceous materials have a density of 1.75 g/cm ³ to 1.95 g/cm ³ and a Shore hardness of 50 to 90. In other examples, the directional carbonaceous materials have a density from 1.84 g/cm ³ to 1.93 g/cm ³ and a Shore hardness of 58 to 85.

It is worth mentioning that the method for producing an isotropic carbonaceous material of the present invention directly pulverizes the pulverized powder obtained by pulverizing the mesocarbon microbeads without any addition of any binder, by cold equalization method. The green body can effectively shorten the processing time for subsequent carbonization of the green body and improve the yield. Therefore, the method of the present invention eliminates the conventional impregnation, re-baking, and the like to repair cracks.

Since the method for producing an isotropic carbonaceous material of the present invention is not only environmentally friendly and energy-saving, and the obtained isotropic carbonaceous material has better equi-directionality, the surface is intact and free from defects, and the mechanical, thermal and electrical properties thereof are greatly improved. It is then used to expand the scope of its industrial use and increase its economic value. For example, the isotactic carbonaceous material obtained as described above can be applied to electric discharge machining, continuous casting, single crystal enamel crystal growth furnace, and the like.

The following examples are provided to illustrate the application of the present invention, and are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention.

Preparation of isotropic carbonaceous materials

Example 1

First, the mesophase carbon microspheres G (TI is 99.0%, QI is 98.6%, average particle diameter (D ₅₀ ) is 24 μm; China Steel Carbon Chemical Co., Ltd.; A-1), using gas-type pulverizing equipment (ALG-2, Lingguang Industrial Company, Taiwan) was smashed. The average particle diameter (D ₅₀ ) after the pulverization of the mesocarbon microbeads was analyzed by a particle size analyzer (Multisizer ^TM 3, Beckman Coulter, Inc., USA) to be about 5 μm. Among them, the basic data series of mesophase carbon microspheres G is in the first table.

Next, 402 g of the above-mentioned pulverized mesocarbon microbeads were filled in a cylindrical rubber mold (molar wall thickness: 1.0 mm) having an inner diameter of 76 mm, and the filling height of the pulverized powder in the mold was about 140 mm. After the homogenous rubber cover on the mold cover is compacted, it is simply packaged (for example, tightly wound with an electrical tape) to avoid contamination of the pressurized liquid into the mold during cold equalizing operation.

The above mold containing mesocarbon microbeads was placed in a cold equalizing apparatus (CL4.5-22-30, Nikkiso Co., Ltd., Japan), and pressurized to about 1,400 kg/cm ² under this pressure. Maintain for about 5 minutes. Thereafter, the pressure was released to normal pressure, and the press-formed cylindrical green body was taken out from the rubber mold, wherein the green body had a diameter of 60 mm and a length of 109 mm.

Next, the green body is placed in a generally commercially available atmosphere furnace, and the green body is subjected to room temperature at a first average heating rate of 6.55 ° C / hr per hour in the presence of a first protective atmosphere such as nitrogen ( Heated to 1000 ° C at about 30 ° C) and did not hold the temperature. Thereafter, the first natural cooling step is performed, and the furnace body is naturally cooled to 25 ° C to 40 ° C in about 48 hours without using any cooling equipment, and the carbonized material obtained by the carbonization treatment has a density of 1.62 g/cm. ³ .

Then, the foregoing carbonized material is placed in a vacuum high temperature furnace (Vacuum Furnace Type 45, Centorr Vacuum Industries, Inc.) at a second average heating rate of 6.7 ° C / min in the presence of a second protective atmosphere such as argon. The aforementioned carbonized material was heated from room temperature (about 30 ° C) to 2750 ° C and held at a temperature for 1 hour to carry out graphitization treatment. Thereafter, a second natural cooling step is performed to naturally cool the furnace body to 25 ° C to 40 ° C without using any cooling equipment, wherein the obtained graphitized material is an isotropic carbonaceous material. The isotropic carbonaceous material obtained in Example 1 has a density of 1.84 g/cm ³ and a Shore hardness of 58, the surface of which is intact and non-defective, and the thermal expansion coefficients of the directional carbonaceous materials in all directions therebetween. The difference is less than 10% (the coefficient of thermal expansion in the X, Y, and Z directions is 6.0 × 10 ^-6 K ^-1 to 6.1 × 10 ^-6 K ^-1 ).

The isotropic carbonaceous material obtained in Example 1 was further tested for its flexural strength, compressive strength, heat transfer coefficient, and electrical resistivity. The method for detecting the details will be described later, and the results are shown in Table 2.

Example 2

Example 2 used the same method and process conditions as in Example 1. The difference is that Example 2 uses mesocarbon microbeads M (TI is 96.9%, QI is 95.0%, average particle size (D ₅₀ ) is 24 μm; Sinosteel Carbon Chemical Co., Ltd.; A-2) The basic information of raw materials is also listed in Table 1.

The carbonized material obtained in Example 2 had a density of 1.74 g/cm ³ , and the obtained isotropic carbonaceous material had a density of 1.93 g/cm ³ and a Shore hardness of 85, and the surface was intact and free from cracks and the like. And the difference between the thermal expansion coefficients of the directional carbonaceous materials in all directions is less than 10% (the thermal expansion coefficients in the X, Y, and Z directions are both 6.8×10 ^-6 K ^-1 to 7.2×). 10 ^-6 K ^-1 ).

The isotropic carbonaceous material obtained in Example 2 was further tested for its flexural strength, compressive strength, heat transfer coefficient, and electrical resistivity. The method for detecting the details is as described later, and the results are shown in Table 2.

Comparative Example 1 to Comparative Example 3

In Comparative Example 1 to Comparative Example 3, cold isostatic pressing, carbonization, and graphitization were carried out in the same manner as in Example 1. The difference was that Comparative Example 1 to Comparative Example 3 used mesocarbon microbeads B without adding any binder and not pulverized (TI was 99.4%, QI was 98.9%, and average particle diameter (D ₅₀ ) was 21 μm; The basic information of Sinosteel Carbon Chemical Co., Ltd.; A-3) as raw materials is also listed in Table 1.

The unpulverized mesocarbon microbeads were filled in a cylindrical rubber mold having an inner diameter of 71 mm (mold wall thickness: 1.0 mm), and the filling height in the mold was about 123 mm. The green body after cold press forming, wherein the green body of Comparative Example 1 has a diameter of 59 mm and a length of 108 mm; the green body of Comparative Example 2 has a diameter of 58 mm and a length of 101 mm; and the diameter of the green body of Comparative Example 3 It is 60mm and has a length of 105mm.

Next, the process conditions of the cold press equalization molding and the carbonization treatment of Comparative Example 1 to Comparative Example 3 were also different from those of Example 1, and the process conditions were serialized in Table 2.

Table 1: Basic information of mesophase carbon microspheres

Assess the effectiveness of directional carbonaceous materials

Surface appearance

The carbonized material and the isotropic carbonaceous material obtained in Examples 1 to 2, and the carbonized materials obtained in Comparative Examples 1 to 3 were further visually observed for the surface integrity, and evaluated according to the following criteria. As shown in Table 2:

○: The surface is intact and free of defects or cracks

╳: The surface is incomplete and has multiple cracks

╳╳: The surface is incomplete and has many serious cracks

As can be seen from the second table, the carbonized material and the isotropic carbonaceous material obtained in Examples 1 to 2 have a complete surface and are free from defects or cracks. In contrast, the carbonized materials obtained in Comparative Examples 1 to 3 had cracks on the surface. In addition, it is known from practical experience that the carbonized material with cracks undergoes a higher temperature graphitization treatment, and the crack on the green body will be more serious, so that a complete isotropic carbonaceous material cannot be obtained.

2. Mechanical strength

Next, the isotropic carbonaceous materials obtained in Examples 1 to 2 were evaluated for mechanical strength, which were measured using a commercially available Shore Hardness Tester (Type D, Sato Seiki Co., Japan). Shore hardness (Shore hardness; Hs), measured by ASTM (American Society for Testing and Materials) C651 test method and Sintech 10/GL material testing machine (MTS Test Systems Co., USA), and used ASTM C695 The test method was measured for compressive strength with a Sintech 10/GL material testing machine (MTS Test Systems Co., USA), and the results are shown in Table 2.

As can be seen from the second table, the carbonized material and the isotropic carbonaceous material obtained in Examples 1 to 2 have a Shore hardness of 58 to 85, a flexural strength of 28 MPa to 44 MPa, and a compressive strength of 69 MPa to 120 MPa. Since Comparative Examples 1 to 3 could not produce a complete carbonized material, the graphitization treatment was not performed, and thus there was no measurement property.

3. Thermal and electrical properties

Further, the isotropic carbonaceous materials obtained in Examples 1 to 2 were evaluated for thermal and electrical properties, and the thermal conductivity and thermal expansion coefficient were measured by ASTM C714 and ASTM E228, and ASTM C611 was used. The test method measures the resistivity, and the results are shown in Table 2.

As can be seen from the second table, the carbonized material and the isotropic carbonaceous material obtained in Examples 1 to 2 have a heat transfer coefficient of 64 W/mK to 40 W/mK and a coefficient of thermal expansion of 6.0×10 ^-6 / K to 7.2 × 10 ^-6 /K, and the resistivity is 7.0 μΩm to 10.8 μΩm.

As can be seen from the results of Table 2, in Examples 1 to 2, the mesocarbon microbeads without any binder were molded into green bodies by pulverization and cold equalization, and the subsequent carbonization treatment time was shortened. The object of the invention can be achieved.

However, it should be added here that the isotropic carbonaceous material of the present invention and the manufacturing method thereof are merely illustrative, and other mesophase carbon microspheres, other carbonization treatment conditions, and other graphitization treatments may be used in other embodiments. Conditions or other equipment. For example, any one of ordinary skill in the art to which the present invention pertains will readily appreciate that the carbonization and graphitization treatments described above may be used when the green body size is greater than the cylindrical green body size of the above-described embodiments of the present invention. The embodiment has a smaller average heating rate, and the carbonized material and the isotropic carbonaceous material thus obtained start to have a complete, crack-free surface and are equidirectional. Therefore, the process conditions of the carbonization and graphitization treatment of the present invention can also be adjusted depending on the actual size of the green body or the size of the furnace body. This is well known to those of ordinary skill in the art to which the invention pertains and will not be further described.

In summary, it can be seen from the above embodiments of the present invention that the omnidirectional carbonaceous material and the method for producing the same according to the present invention have the advantages of pulverizing and cold equalizing the intermediate phase carbon microspheres without adding any binder. After molding into a green body, not only can the subsequent treatment time of carbonization and graphitization be shortened, but the surface of the obtained isotropic carbonaceous material is complete, crack-free and equidirectional, and the mechanical, thermal and electrical properties are greatly improved. The nature, in turn, increases its industrial application range and enhances its economic value, for example, it can be applied to electric discharge machining, continuous casting, single crystal enamel crystal growth furnace, and the like.

The present invention has been disclosed in the above embodiments, and is not intended to limit the scope of the present invention, and it is possible to make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100. . . method

101. . . Step of pulverizing mesocarbon microbeads to form pulverized powder

103. . . Step of molding the pulverized powder into a green body by cold equal pressure equalization

105. . . The step of carbonizing the green body to form a carbonized material

107. . . Step of graphitizing the carbonized material to form an isotropic carbonaceous material

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

1 is a partial flow chart showing a method of manufacturing an isotropic carbonaceous material according to an embodiment of the present invention.

100. . . method

101. . . Step of pulverizing mesocarbon microbeads to form pulverized powder

103. . . Step of molding the pulverized powder into a green body by cold equal pressure equalization

105. . . The step of carbonizing the green body to form a carbonized material

107. . . Step of graphitizing the carbonized material to form an isotropic carbonaceous material

Claims (11)

A method for producing an isotropic carbonaceous material, comprising: pulverizing mesocarbon microbeads to form a pulverized powder having an average particle diameter of from 1 μm to 10 μm, wherein the mesocarbon microbeads have a toluene-insoluble component (toluene) Insoluble, TI) and a quinoline insoluble (QI), and the difference between the TI and the QI is 2.0 weight percent (wt%) or less and more than 1.5 wt%; the pulverized powder is passed through a cold, etc. Molding by cold isostatic pressing to form a green body; subjecting the green body to a carbonization treatment in the presence of a first protective atmosphere to form a carbonized material; and presenting in a second protective atmosphere The carbonized material is subjected to a graphitization treatment to form the unidirectional carbonaceous material, wherein any surface of the directional carbonaceous material is intact and free, and the directional carbonaceous material is in X The difference between the thermal expansion coefficients of the shaft, the Y-axis and the Z-axis is less than 10%. The method of manufacturing a carbonaceous material, the directivity of a request and the like, wherein the cold pressing method etc. pulverized powder is applied to the one line ² greater molding pressure 500kg / cm ² to 3000kg / cm to form the green Billet. The manufacturing method of the directivity of the carbonaceous material and the like requested item 1, wherein the cold pressing method etc. is applied based 800kg / cm ² larger one to a molding pressure of ² 2000kg / cm of the pulverized powder to form the Green body. The method for producing an isotropic carbonaceous material according to claim 1, wherein the pulverized powder has an average particle diameter of from 3 μm to 8 μm. The method for producing an isotropic carbonaceous material according to claim 1, wherein the difference between the TI and the QI is 0.2 wt% to 2.0 wt%. The method for producing an isotropic carbonaceous material according to claim 1, wherein the difference between the TI and the QI is from 0.4 wt% to 2.0 wt%. The method for producing an isotropic carbonaceous material according to claim 1, wherein the first protective atmosphere is nitrogen, argon, helium or any combination thereof. The method for producing an isotropic carbonaceous material according to claim 7, wherein the first protective atmosphere is nitrogen. The method for producing an isotropic carbonaceous material according to claim 1, wherein the second protective atmosphere is nitrogen, argon, helium or any combination thereof. An isotropic carbonaceous material obtained by the method of any one of claims 1 to 9, wherein the isotropic carbonaceous material has a range of 1.75 g/cm ³ to 1.95 g/cm ³ Density and Shore hardness of 50 to 90. The requested item directivity of the carbonaceous material and the like 10, wherein the carbonaceous material having such directivity 1.84g / cm ³ to 1.93g / cm ³ density of 58 to 85 and the Shore hardness.