WO2022114288A1

WO2022114288A1 - Carbon fiber coated with silicon carbide, method for manufacturing same, and method for recycling carbon fiber

Info

Publication number: WO2022114288A1
Application number: PCT/KR2020/017064
Authority: WO
Inventors: 김우식; 탁우성; 황진욱; 어수빈
Original assignee: 한국세라믹기술원
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2022-06-02
Also published as: KR102466005B1; KR20220074042A

Abstract

Provided is a method for manufacturing a carbon fiber coated with silicon carbide. The method for manufacturing a carbon fiber coated with silicon carbide may comprise the steps of: preparing a carbon fiber; coating the surface of the carbon fiber with graphene oxide; coating, with silicon oxide, the carbon fiber that has been coated with the graphene oxide; and heat-treating the carbon fiber that has been coated with the silicon oxide and the graphene oxide so as to form a silicon carbide layer on the surface of the carbon fiber.

Description

Carbon fiber coated with silicon carbide, manufacturing method thereof, and recycling method of carbon fiber

The present application relates to carbon fibers, and more particularly, to carbon fibers coated with silicon carbide, a manufacturing method thereof, and a recycling method of carbon fibers.

Carbon fiber composite material is a high-functional material designed for the purpose by combining the excellent formability of carbon fiber and high strength at high temperature. Carbon fiber, a high-strength, high-elastic material, is used as a core material for high-value-added composite materials in aircraft, space shuttles, and structural materials. There are Carbon Fiber Reinforced Plastic (CFRP), Carbon Fiber Reinforced Ceramic (CFRC), and Carbon Fiber Reinforced Metal (CFRM).

In the 1970s and 1980s, when carbon fiber composite materials were initially introduced, they were applied only to very limited items such as aircraft structural materials, high-quality fishing rods and golf shafts due to high prices, and then gradually expanded. is becoming

For example, in Korean Patent No. 10-2178734, (a) preparing a spinning solution including a first metal precursor, a second metal precursor, and a carbon nanofiber precursor, (b) electrospinning the spinning solution Preparing carbon nanofibers including a first metal precursor and a second metal precursor, (c) heat-treating the carbon nanofibers, and (d) etching the heat-treated carbon nanofibers, ( In step c), the first metal precursor is oxidized to become a first metal oxide, the second metal precursor is reduced to become second metal nanoparticles, and in step (d), hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, phosphoric acid , using any one selected from calcium hydroxide and sodium hydroxide as an etchant to selectively etch the first metal oxide or the second metal nanoparticles, and after the first metal oxide is selectively etched, the first metal oxide is located A method for producing a carbon nanofiber composite, in which nanopores are formed in the portion, or after the second metal nanoparticles are selectively etched, nanopores are formed in the portion where the second metal nanoparticles were located has been disclosed.

On the other hand, as the use of carbon fibers expands, technology development for recycling carbon fibers is also required.

One technical problem to be solved by the present application is to provide a carbon fiber coated with silicon carbide and a method for manufacturing the same.

Another technical problem to be solved by the present application is to provide a method for recycling carbon fibers.

Another technical problem to be solved by the present application is to provide a carbon fiber coated with silicon carbide having excellent thermal stability, and a method for manufacturing the same.

Another technical problem to be solved by the present application is to provide a carbon fiber coated with silicon carbide that can be used as a nonwoven fabric and a filter, and a method for manufacturing the same.

The technical problem to be solved by the present invention is not limited to the above.

In order to solve the above-described technical problems, the present application provides a method of manufacturing a carbon fiber coated with silicon carbide.

According to an embodiment, the method for manufacturing the silicon carbide-coated carbon fiber includes preparing a carbon fiber, coating the graphene oxide on the surface of the carbon fiber, and the graphene oxide-coated carbon fiber Coating the silicon oxide on the silicon oxide, and heat-treating the carbon fiber coated with the silicon oxide and the graphene oxide, it may include the step of generating a silicon carbide layer on the surface of the carbon fiber.

According to an embodiment, the carbon fiber may include recycled carbon fiber.

According to an embodiment, the preparing of the carbon fiber may include heat-treating the recycled carbon fiber, desizing the recycled carbon fiber and removing impurities on the surface of the recycled carbon fiber. have.

According to an embodiment, the coating of the silicon oxide on the carbon fiber includes preparing a silicon source solution in which a silicon precursor and a catalyst are mixed, and immersing the carbon fiber in the silicon oxide source solution. may include

According to an embodiment, the preparing of the silicon oxide source solution includes preparing a catalyst solution by mixing the catalyst and a first base solvent, and preparing a silicon solution by mixing the silicon precursor and the second base solvent. and mixing the catalyst solution and the silicon solution to prepare the silicon oxide source solution.

According to an embodiment, the catalyst may include NH ₄ OH, and the silicon precursor may include TEOS.

According to an embodiment, the first base solvent and the second base solvent may include ethanol.

According to an embodiment, after the carbon fiber is immersed in the silicon oxide source solution and stirred at room temperature, it may include coating the silicon oxide on the carbon fiber.

According to an embodiment, the coating of the graphene oxide on the surface of the carbon fiber may include preparing a graphene oxide source solution in which the graphene oxide is dispersed, and applying the carbon fiber to the graphene oxide source solution. After providing to, it may include a step of stirring while heat-treating.

According to an embodiment, the temperature for heat-treating the carbon fiber coated with the silicon oxide and the graphene oxide may include a temperature higher than a temperature for heat-treating the carbon fiber after providing the carbon fiber to the graphene oxide source solution. .

According to an embodiment, the carbon fiber coated with the silicon oxide and the graphene oxide may be heat-treated to convert the silicon oxide into the silicon carbide layer.

In order to solve the above technical problem, the present application provides a carbon fiber coated with silicon carbide.

According to an embodiment, the carbon fiber coated with silicon carbide may include a carbon fiber and a silicon carbide layer on a surface of the carbon fiber, wherein the carbon fiber is a recycled carbon fiber.

In order to solve the above technical problem, the present application provides a membrane.

According to an embodiment, the membrane may include providing a plurality of carbon fibers coated with silicon carbide according to the above-described embodiments to form a network with each other.

According to an embodiment of the present application, a surface of a carbon fiber is coated with graphene oxide, a silicon oxide is coated on the carbon fiber coated with the graphene oxide, and the silicon oxide and the graphene oxide are coated. By heat-treating the carbon fiber, a silicon carbide layer may be formed on the surface of the carbon fiber.

Due to this, the silicon carbide layer formed by reacting the graphene oxide and the silicon oxide may be formed with a substantially uniform thickness on the surface of the carbon fiber, and thus, the carbon coated with the silicon carbide layer Fibers can stably maintain properties in a high-temperature oxidizing atmosphere, and can be easily utilized in various industrial fields such as nonwoven fabrics and filters.

In addition, as described above, the carbon fiber may be recycled carbon fiber, and thus, an eco-friendly recycling method of carbon fiber that can be recycled to save the disposal cost of industrial waste by recycling the discarded carbon fiber will be provided. can

1 is a flowchart for explaining a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application.

FIG. 2 is a view for explaining a process of forming a first functional group in a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application.

FIG. 3 is a view for explaining a process of forming a second functional group in a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application.

FIG. 4 is a view for explaining a method of coating graphene oxide in a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application.

5 is a view for explaining a method of manufacturing a silicon oxide source solution in the method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application.

6 is a view for explaining a method of coating silicon oxide in a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application.

7 is a view for explaining a carbon fiber coated with silicon carbide according to an embodiment of the present application.

8 is a FE-SEM photograph of recycled carbon fibers and graphene oxide-coated carbon fibers according to an experimental example of the present application.

9 is an FE-SEM photograph of a carbon fiber coated with graphene oxide and silicon oxide according to an experimental example of the present application.

10 is an FE-SEM photograph of a carbon fiber coated with silicon carbide according to an experimental example of the present application.

11 is a TGA curve for explaining the thermal stability of a carbon fiber coated with silicon carbide according to an experimental example of the present application.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In addition, in various embodiments of the present specification, terms such as first, second, third, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Accordingly, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes a complementary embodiment thereof. In addition, in this specification, 'and/or' is used in the sense of including at least one of the components listed before and after.

In the specification, the singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, terms such as "comprise" or "have" are intended to designate that a feature, number, step, element, or a combination thereof described in the specification exists, but one or more other features, number, step, configuration It should not be construed as excluding the possibility of the presence or addition of elements or combinations thereof. In addition, in this specification, "connection" is used in a sense including both indirectly connecting a plurality of components and directly connecting a plurality of components.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a flowchart for explaining a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application, and FIG. 2 is a first method for manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application It is a view for explaining a process of forming a functional group, FIG. 3 is a view for explaining a process of forming a second functional group in a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application, FIG. 4 is It is a view for explaining a method of coating graphene oxide in a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application, and FIG. 5 is a manufacturing method of carbon fiber coated with silicon carbide according to an embodiment of the present application It is a view for explaining a method of manufacturing a silicon oxide source solution in the method, and FIG. 6 is a view for explaining a method of coating silicon oxide in a method of manufacturing a carbon fiber coated with silicon carbide according to an embodiment of the present application, FIG. 7 is a view for explaining a carbon fiber coated with silicon carbide according to an embodiment of the present application.

1 and 2, the carbon fiber 100 is prepared (S110).

According to an embodiment, the carbon fiber 100 may be recycled carbon fiber.

In general, carbon fiber has the advantage that it can be widely used for high-performance mechanical structural materials, aircraft, etc. due to its excellent light weight and thermal conductivity. However, carbon fibers are expensive, require a lot of energy to produce carbon fibers, and because the discarded carbon fibers are not combusted, recovery and recycling are required. In addition, there is a disadvantage that carbon fibers show a serious oxidation phenomenon in an oxidizing atmosphere of 500° C. or higher. Accordingly, according to an embodiment of the present application, a method of utilizing discarded carbon fibers, that is, a method of recycling carbon fibers is provided.

As described above, when the carbon fiber 100 is a recycled carbon fiber, the step of preparing the carbon fiber 100 is heat-treating the recycled carbon fiber, desizing the recycled carbon fiber and the It may include removing impurities on the surface of the recycled carbon fiber.

Accordingly, as will be described later, graphene oxide 130 and silicon oxide may be easily and uniformly coated on the surface of the carbon fiber 100 .

Continuing to refer to FIG. 2 , the first functional group 110 may be formed on the surface of the carbon fiber 100 . As shown in FIG. 2 , the first functional group 110 may include an OH group.

According to an embodiment, the forming of the first functional group 110 on the surface of the carbon fiber 100 includes preparing a pretreatment solution, and providing the pretreatment solution to the carbon fiber 100 . may include the step of For example, the pretreatment solution may be a mixed acidic solution including sulfuric acid and nitric acid. Specifically, the mixed acid solution may be a mixture of sulfuric acid and nitric acid in a volume ratio of 3:1.

When the mixed acid solution is provided to the carbon fiber 100, the surface bonding structure of the carbon fiber 100 is destroyed by the sulfuric acid and nitric acid contained in the mixed acid solution, and sulfuric acid and nitric acid are interposed between the destroyed bonding structures. O and H included therein may be combined to form the first functional group 110 on the surface of the carbon fiber 100 . Accordingly, the surface of the carbon fiber 100 may be easily modified, and as a result, the first functional group 110 may be easily formed on the surface of the carbon fiber 100 .

Referring to FIG. 3 , after the first functional group 110 is formed on the surface of the carbon fiber 100 , a second functional group 120 may be formed on the surface of the carbon fiber 100 . . As shown in FIG. 3 , the second functional group 120 may include an amine group.

According to an embodiment, the forming of the second functional group 120 on the surface of the carbon fiber 100 includes preparing a base solution having an amine group, and the carbon fiber 100 in the base solution. ) may include the step of immersion and heat treatment. For example, the base solution may be a mixed solution of ethylene diamine and distilled water, and after the carbon fiber 100 is immersed in the base solution, it may be reacted at about 70° C. for 10 hours. Accordingly, the second functional group 120 may be easily formed on the surface of the carbon fiber 100 .

After the second functional group 120 is formed, the carbon fiber 100 may be washed and dried.

Continuingly, referring to FIGS. 1 and 4 , the graphene oxide 130 may be coated on the surface of the carbon fiber 100 ( S120 ).

As described above, before the graphene oxide 130 is coated, the first functional group 110 and the second functional group 120 may be first provided on the surface of the carbon fiber 100 . . That is, as the second functional group 120 (eg, an amine group) provided on the surface of the carbon fiber 100 and the graphene oxide 130 are combined, the graphene oxide 130 forms the carbon It can be easily coated on the surface of the fiber 100 .

According to an embodiment, the coating of the graphene oxide 130 on the carbon fiber 100 includes preparing a graphene oxide source solution in which the graphene oxide 130 is dispersed, and the carbon After providing the fiber 100 to the graphene oxide source solution, it may include agitating while heat-treating. For example, the graphene oxide source solution provided with the carbon fibers 100 may be stirred at about 80° C. for 5 hours. Also, for example, the graphene oxide 130 may be mixed with distilled water to prepare the graphene oxide source solution.

1, 5, and 6 , silicon oxide may be coated on the carbon fiber 100 coated with the graphene oxide 130 ( S130 ).

The surface of the graphene oxide 130 may include an OH group, and the silicon oxide may be combined with an OH group on the surface of the graphene oxide 130 so that the silicon oxide may be coated on the carbon fiber 100 . have.

According to an embodiment, the coating of the silicon oxide on the carbon fiber 100 includes preparing a silicon source solution 230 in which a silicon precursor and a catalyst are mixed, and the silicon oxide source solution 230 . It may include the step of immersing the carbon fiber 100 in and stirring. According to an embodiment, after the carbon fiber 100 is immersed in the silicon oxide source solution 230 and stirred at room temperature, the graphene oxide 130 is coated on the carbon fiber 100 . Silicon oxide may be coated.

In addition, the preparing of the silicon oxide source solution 230 includes preparing the catalyst solution 210 by mixing the catalyst and the first base solvent, and mixing the silicon precursor and the second base solvent to obtain a silicon solution ( 220 ), and mixing the catalyst solution 210 and the silicon solution 220 to prepare the silicon oxide source solution 230 . For example, the catalyst may include NH ₄ OH, and the first base solvent may include water and ethanol. Also, for example, the silicon precursor may include TEOS, and the second base solvent may include ethanol.

By the catalyst, in the process of coating the silicon oxide on the carbon fiber 100 , a basic atmosphere may be created, and thus, the silicon oxide may be easily formed in the form of particles. On the other hand, unlike the embodiment of the present application, when the catalyst creates an acidic atmosphere, the seed reaction predominantly proceeds so that the silicon oxide may be produced in the form of fibers.

If, unlike the embodiment of the present application, when the silicon oxide is formed in the form of fibers rather than particles, the silicon oxide in the form of fibers may not completely contact the carbon fibers 100 . That is, some regions may be spaced apart from the carbon fiber 100 . In this case, a silicon carbide layer to be described later on the surface of the carbon fiber 120 may not be formed with a uniform thickness and as a whole.

However, according to the embodiment of the present application, the silicon oxide may be formed on the surface of the carbon fiber 100 in the form of particles, and thus, a silicon carbide layer to be described later has a uniform thickness on the carbon fiber 100 ) can be formed on the front side of

In addition, if, unlike the above-described embodiment of the present application, when the silicon precursor is directly added to the catalyst solution 210 , it reacts directly with the catalyst solution 210 , while hydrolysis, water, alcohol polymerization and condensation Through the reaction, particles of the silicon oxide may be formed, and thereby the particles of the silicon oxide may be aggregated.

However, as described above, according to an embodiment of the present application, after separately preparing the catalyst solution 210 and the silicon solution 220 including the silicon precursor, the catalyst solution 210 and the silicon solution The silicon oxide source solution 230 may be prepared by mixing 220 , and the silicon oxide may be coated on the carbon fiber 100 using the silicon oxide source solution 230 . Accordingly, the silicon oxide particles provided on the carbon fiber 100 do not agglomerate with each other and may be provided in a substantially uniformly dispersed form, and as a result, the carbon fiber 100 described later The silicon carbide layer 150 may be formed to have a uniform thickness.

According to an embodiment, the process in which the carbon fiber 100 coated with the graphene oxide 130 is stirred with the silicon oxide source solution 130, washed, and dried may be repeated a plurality of times. Accordingly, the silicon oxide may be uniformly coated on the surface of the carbon fiber 100 .

Continuingly, referring to FIG. 1 , by heat-treating the carbon fiber 100 coated with the silicon oxide and the graphene oxide 130 , a silicon carbide layer 150 is formed on the surface of the carbon fiber 100 . can be created Specifically, in the process of heat-treating the carbon fiber 100 coated with the silicon oxide and the graphene oxide 130 , the silicon oxide and the graphene oxide 130 and/or the carbon fiber 100 . Carbon may react to form the silicon carbide layer 150 on the surface of the carbon fiber 100 .

Specifically, through the exaggeration of <Formula 1> and <Formula 2> below, the carbonized structure layer 150 may be formed.

SiO ₂ -> 2SiO

SiO + C -> SiC + 2CO

As described above, according to the embodiment of the present application, after the first functional group 110 and the second functional group 120 are sequentially formed on the carbon fiber 100 , the graphene oxide 130 ) may be formed on the surface of the carbon fiber 100 , and thus, the graphene oxide 130 may be substantially conformally coated on the surface of the carbon fiber 100 . Accordingly, the silicon carbide layer 150 formed by reacting the graphene oxide 130 and the silicon oxide may be formed on the surface of the carbon fiber 100 to have a substantially uniform thickness.

Accordingly, the carbon fiber 100 coated with the silicon carbide layer 150 may stably maintain properties in a high-temperature oxidizing atmosphere, and may be easily utilized in various industrial fields such as nonwoven fabrics and filters.

In addition, the carbon fiber 100 coated with the silicon carbide layer 150 may be formed by a solution coating process and a heat treatment process, and thereby, the carbon fiber 100 coated with the silicon carbide layer 150 . The cost of the manufacturing process can be saved, and it can be manufactured in high yield using simple equipment.

In addition, as described above, the carbon fiber 100 may be a recycled carbon fiber, and thus, an eco-friendly recycling method of carbon fiber, which can reduce the processing cost of industrial waste by recycling the discarded carbon fiber can be provided.

Hereinafter, a method for manufacturing a carbon fiber coated with silicon carbide according to a specific experimental example of the present application, and a characteristic evaluation result will be described.

Preparation of carbon fiber coated with silicon carbide according to an experimental example

Recycled carbon fibers were prepared, sized by heat treatment at 400° C. for 2 hours, and impurities were removed.

Thereafter, the surface of the carbon fiber was modified using a pretreatment solution in which sulfuric acid and nitric acid were mixed in a volume ratio of 3:1 to form OH groups on the surface of the carbon fiber.

Thereafter, a base solution was prepared in which ethylenediamine was added in an amount of 10v% of distilled water, and the carbon fiber having OH groups was added to the base solution and reacted at 70° C. for 10 hours, washed and dried, An amine group was formed on the surface.

A graphene oxide source solution having 0.5 mg/ml of graphene oxide in distilled water was prepared, immersed in the graphene oxide source solution, and stirred at 80° C. for 5 hours, on the surface of the carbon fiber, the graphene oxide was coated.

A catalyst solution was prepared by mixing ethanol, NH ₄ OH, and distilled water, and a silicone solution was prepared by mixing TEOS, a silicon precursor, and distilled water. A silicon oxide source solution is prepared by mixing the catalyst solution and the silicon solution, the carbon fiber coated with the graphene oxide is immersed in the silicon oxide source solution, and then stirred at room temperature for 3 hours, washed and dried Thus, silicon oxide was coated on the surface of the carbon fiber.

Thereafter, heat treatment was performed in a tube furnace at 1500° C. for 3 hours to prepare carbon fibers coated with silicon carbide.

Referring to FIG. 8 , FE-SEM pictures of recycled carbon fibers and graphene oxide-coated carbon fibers according to the above-described experimental examples were taken. Specifically, (a) of FIG. 8 is an FE-SEM photograph of recycled carbon fibers, and (b) of FIG. 8 is an FE-SEM photograph of carbon fibers coated with graphene oxide.

As can be seen from FIG. 8 , it can be confirmed that graphene oxide is coated on the surface of the recycled carbon fiber.

Referring to FIG. 9 , FE-SEM pictures of carbon fibers coated with graphene oxide and silicon oxide according to the above-described experimental examples, and carbon fibers coated with silicon oxide without graphene oxide were taken. Specifically, (a) of FIG. 9 is an FE-SEM photograph of a carbon fiber coated with graphene oxide and silicon oxide, and (b) of FIG. 9 is an FE- of a carbon fiber coated with silicon oxide without graphene oxide. This is an SEM picture.

As can be seen in FIG. 9 , it can be confirmed that graphene oxide and silicon oxide are uniformly coated on the surface of the carbon fiber. On the other hand, when the graphene oxide is omitted, it can be seen that the silicon oxide is coated non-uniformly.

Referring to FIG. 10 , an FE-SEM photograph of the carbon fiber coated with silicon carbide according to the above-described experimental example was taken. Specifically, (a) of FIG. 10 is a FE-SEM photograph of the surface of the carbon fiber coated with silicon carbide, and FIG. It's a photo.

As can be seen from FIG. 10 , it can be confirmed that the silicon carbide layer is conformally formed on the surface of the carbon fiber after heat treatment, and thus, the recycled carbon fiber is expected to maintain stable properties in an oxidizing atmosphere at a high temperature.

Referring to FIG. 11 , in the production of silicon carbide-coated carbon fiber according to the above-described experimental example, the surface is modified using a recycled carbon fiber sized and impurity treated by heat treatment at 400° C. for 2 hours, and a pretreatment solution TGA measurement was performed on carbon fibers coated with graphene oxide and silicon oxide, and carbon fibers coated with silicon carbide at a temperature increase rate of 5° C./min in a nitrogen gas atmosphere.

As can be seen from FIG. 11 , in the case of the carbon fiber coated with silicon carbide, it can be confirmed that the properties are stably maintained without substantial change up to a high temperature of 600°C. That is, it can be confirmed that the carbon fiber coated with silicon carbide according to an embodiment of the present application has high temperature stability.

As mentioned above, although the present invention has been described in detail using preferred embodiments, the scope of the present invention is not limited to specific embodiments and should be construed according to the appended claims. In addition, those skilled in the art will understand that many modifications and variations are possible without departing from the scope of the present invention.

The carbon fiber coated with silicon carbide according to an embodiment of the present application has high functionality, and thus can be used in various industrial fields such as nonwoven fabrics and filters, and the discarded carbon fibers can be effectively recycled.

Claims

preparing carbon fiber;

coating the graphene oxide on the surface of the carbon fiber;

coating silicon oxide on the carbon fiber coated with the graphene oxide; and

Heat-treating the carbon fiber coated with the silicon oxide and the graphene oxide, comprising the step of generating a silicon carbide layer on the surface of the carbon fiber, a method for producing a silicon carbide-coated carbon fiber.
According to claim 1,

The carbon fiber is a method for producing a carbon fiber coated with silicon carbide, comprising that of a recycled carbon fiber.
3. The method of claim 2,

The step of preparing the carbon fiber,

Heat-treating the recycled carbon fiber, desizing the recycled carbon fiber (desizing) and removing impurities on the surface of the recycled carbon fiber, a method of producing a silicon carbide-coated carbon fiber.
According to claim 1,

The step of coating the silicon oxide on the carbon fiber,

preparing a silicon source solution in which a silicon precursor and a catalyst are mixed; and

Method for producing a carbon fiber coated with silicon carbide comprising the step of immersing the carbon fiber in the silicon oxide source solution.
5. The method of claim 4,

The step of preparing the silicon oxide source solution,

preparing a catalyst solution by mixing the catalyst and a first base solvent;

preparing a silicon solution by mixing the silicon precursor and a second base solvent; and

Mixing the catalyst solution and the silicon solution, the method of manufacturing a silicon carbide-coated carbon fiber comprising the step of preparing the silicon oxide source solution.
6. The method of claim 5,

The catalyst comprises NH 4 OH,

The silicon precursor is a method for producing a silicon carbide-coated carbon fiber containing TEOS.
6. The method of claim 5,

The first base solvent and the second base solvent are silicon carbide-coated carbon fibers comprising ethanol.
5. The method of claim 4,

After the carbon fiber is immersed in the silicon oxide source solution and stirred at room temperature, the method for producing a silicon carbide-coated carbon fiber comprising coating the silicon oxide on the carbon fiber.
According to claim 1,

The step of coating the graphene oxide on the surface of the carbon fiber,

preparing a graphene oxide source solution in which the graphene oxide is dispersed; and

After providing the carbon fiber to the graphene oxide source solution, a method for producing a silicon carbide-coated carbon fiber comprising the step of stirring while heat-treating.
10. The method of claim 9,

The temperature for heat-treating the carbon fiber coated with the silicon oxide and the graphene oxide is higher than the temperature for heat-treating the carbon fiber after providing the carbon fiber to the graphene oxide source solution of the carbon fiber coated with silicon carbide. manufacturing method.
According to claim 1,

The silicon oxide and the graphene oxide-coated carbon fiber is heat-treated, and the silicon carbide-coated method of manufacturing a carbon fiber comprising converting the silicon oxide into the silicon carbide layer.
carbon fiber; and

A silicon carbide layer on the surface of the carbon fiber,

The carbon fiber is a carbon fiber coated with silicon carbide, comprising a recycled carbon fiber.
A membrane comprising a plurality of carbon fibers coated with silicon carbide according to claim 12 to form a network with each other.