KR101901870B1 - Method of forming fiber reinforced ceramic composite channels for regenerative cooling, fiber reinforced ceramic composite, and engine nozzle - Google Patents

Abstract

The present invention relates to a method for forming a regenerative cooling type channel on a fiber reinforced ceramic composite, comprising the steps of: preparing a lower structure including first polymer resin and first reinforced fiber positioned within the first polymer resin; denting a portion of the prepared lower structure to form a dented part, a dented space, on the lower structure; filling the dented part with a channel filling material; preparing an upper structure including second polymer resin and second reinforced fiber positioned within the second polymer resin; covering the channel filling material and the lower structure with the prepared upper structure; heat-treating the upper and lower structures to carbonize the first polymer resin and the second polymer resin; and making melted silicon penetrate through the upper and lower structures to manufacture the fiber reinforced ceramic composite. In the carbonizing step, the regenerative cooling type channel is formed. The present invention can form the regenerative cooling type channel in complex shapes with a simple process at low costs.

Description

TECHNICAL FIELD [0001] The present invention relates to a fiber-reinforced ceramic composite material, a fiber-reinforced ceramic composite material, and an engine nozzle,

The present invention relates to a method of forming a regenerative cooling type flow path in a fiber reinforced ceramic composite material.

Recently, the operating temperature of engine systems or propulsion systems such as airplanes, missiles, and rockets is increasing. Operating the engine system or the propulsion system at high temperatures is to increase the operating efficiency of the engine system or the propulsion system. However, when operating the engine system or the propulsion system at a high temperature of 1000 ° C or more, the strength of the engine system or the structure constituting the propulsion system may be reduced.

Accordingly, regenerative cooling type flow paths are provided in structures such as a combustor, a nozzle, and a heat exchanger which are exposed to a high temperature environment such as an aircraft, a missile, and a rocket. When the fuel is injected into the regenerative cooled flow path, the temperature of the structure is lowered and the temperature of the fuel is raised by the heat exchange. Therefore, the heat resistance of the structure can be secured. Since the temperature of the fuel before the combustion is increased in advance, the combustion efficiency can be improved.

Recently, a fiber-reinforced ceramic composite material excellent in heat resistance has been used instead of the conventional metal as the material of the structure. However, it is very difficult to form a regenerative cooling type flow path through hole processing in a fiber reinforced ceramic composite material having high toughness and high strength.

A conventional regenerative cooling type flow path forming method is as follows. First, a lower flat plate, a regenerative cooling type channel tube, and an upper flat plate are manufactured, respectively. These are all fiber reinforced ceramic composite materials. Next, the regenerative cooling type flow path tube is bonded to the upper surface of the lower flat plate. Next, the regenerative cooling type flow tube joined to the upper surface of the lower flat plate is bonded to the lower surface of the upper flat plate. However, this method has a long process time because the lower plate, the regenerated cooling tube, and the upper plate of the fiber-reinforced ceramic composite material are respectively manufactured. Above all, it is difficult to form a regenerative cooling type flow path of complicated shape by this method.

U.S. Patent No. 7479302 (Patent Document 1) discloses a method of manufacturing a preform including a regenerative cooling type flow path and then filling the interior of the preform with a ceramic matrix. The combustion chamber structure shown in Fig. 1 of Patent Document 1 has a complex shape, and the regenerative cooling type flow path formed in the combustion chamber structure also has a complicated shape. That is, a regenerative cooling type flow path of a complicated shape can be formed through the method disclosed in Patent Document 1. However, according to this method, an expensive braiding device or an expensive three-dimensional weaving device is required for preform production.

US Patent No. 7479302 (registered on Jan. 20, 2009)

SUMMARY OF THE INVENTION An object of the present invention is to provide a regenerative cooling type flow path of a complicated shape in a fiber-reinforced ceramic composite material by a low-cost simple process. The low-cost simple process is a process of forming the regenerative cooling type flow path during the lamination of the structure including the reinforcing fiber, and then forming the silicon matrix and the silicon carbide particles in the silicon matrix around the reinforcing fiber.

However, the problems to be solved by the present invention are not limited to the above-described problems, and other problems that are not described can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention is constructed as follows.

Preparing a substructure comprising a first polymeric resin and a first reinforcing fiber located within the first polymeric resin; Depressing a portion of the prepared substructure to form a depression in the substructure, the depression being a recessed space; Filling the formed depression with a filler material; A second polymeric resin and a second reinforcing fiber located in the second polymeric resin; Covering the flow path filling material and the lower structure with the prepared upper structure; Heat treating the upper and lower structures to carbonize the first polymer resin and the second polymer resin; And a step of infiltrating the upper and lower structures with molten silicon to produce a fiber reinforced ceramic composite material, wherein the regenerated cooling flow path is formed in the carbonizing step. / RTI >

The first polymer resin and the second polymer resin may include a thermosetting resin.

The thermosetting resin may include at least one resin selected from the group consisting of a phenol resin, a polyester resin, and an epoxy resin.

The first reinforcing fiber and the second reinforcing fiber may be carbon reinforcing fibers or silicon carbide reinforced fibers.

The flow-through material may include at least one material selected from the group consisting of epoxy, PVB, PVC, polyester, and polyethylene.

The flow path filling material may further include boron nitride.

Preparing the lower structure comprises: preparing a reinforced fiber formed body; Impregnating the reinforcing fiber preform with a liquid polymer resin; And curing the liquid polymer resin to become the polymer resin.

In the step of impregnating the reinforced fiber molding, the reinforcing fiber molding may be impregnated with a vacuum resin transfer molding method, a resin transfer molding method, or a vacuum impregnation method.

The step of preparing the lower structure may further include the step of coating the prepared reinforcing fiber molding with the pyrolytic carbon between the step of preparing the reinforcing fiber molding and the step of impregnating the reinforcing fiber molding.

In the step of forming the depression, the depression may be formed by machining.

The method for forming a regenerated cooling type flow path of a fiber-reinforced ceramic material according to claim 1, further comprising, between the step of filling the formed depression and the step of preparing the upper structure, And polishing the substrate.

In the carbonizing step, the first polymer resin and the second polymer resin may be converted into a carbon coating layer surrounding the first reinforcing fiber and the second reinforcing fiber, respectively.

In the carbonizing step, the first polymer resin and the second polymer resin may be converted into carbon matrices of the upper and lower structures.

In the step of fabricating the fiber-reinforced ceramic composite material, a part of the infiltrated molten silicon reacts with carbon generated in the carbonization step to produce silicon carbide particles, and the infiltrated molten silicon rest is separated from the upper and lower structures And can be cured to bond.

According to an embodiment of the present invention having the above-described structure, a regenerative cooling type flow path is formed while the structure including the reinforcing fiber is being laminated. After the regenerative cooling type flow path is formed, the structure including the reinforcing fibers becomes a fiber reinforced ceramic composite material. Therefore, the process according to an embodiment of the present invention does not form a regenerative cooling type flow path through hole processing in the finished fiber-reinforced ceramic composite material, so that a regenerated cooling type flow path of a complicated shape can be formed.

In addition, this process is not only a simple process but also a low-cost process because it does not involve a step of producing a preform containing a regenerated cooling type flow path by an expensive braiding device or an expensive three-dimensional weaving device.

In addition, according to an embodiment of the present invention, since the depressed portion to be the regenerated cooling channel is formed in the lower structure including the cured polymer resin, even if the heat treatment process, the molten silicon infiltration process, The shape and dimensions of the flow path are not changed.

According to an embodiment of the present invention, since the upper structure and the lower structure are combined by the cured fused silicon, unlike the case where the upper structure and the lower structure are brazed, No play occurs.

In addition, according to an embodiment of the present invention, in a state in which the upper structure and the lower structure are not coupled, the flow path filling material can stably support the upper structure.

In addition, according to an embodiment of the present invention, boron nitride contained in the flow path filling material can prevent molten silicon from flowing into the flow path and changing the shape, dimensions, and the like of the flow path.

1 is a schematic view showing a method of forming a regenerated cooling type flow path of a fiber-reinforced ceramic composite material according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method of forming a regenerated cooling type flow path of a fiber-reinforced ceramic composite material according to an embodiment of the present invention.
3 is a flowchart illustrating a method of fabricating a substructure according to an embodiment of the present invention.
FIG. 4 is a schematic view showing a method of regenerating and cooling a fiber-reinforced ceramic composite material flow path according to an embodiment of the present invention.
5 is a flowchart illustrating a method of forming a regenerated cooling type flow path of a fiber-reinforced ceramic composite material according to an embodiment of the present invention.
6 is an image showing a method for forming a regenerated cooling type flow path of a fiber-reinforced ceramic composite material according to one embodiment of the present invention.
7 is an image showing a method of regenerating and cooling a fiber-reinforced ceramic composite material flow path according to one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

For clarity of explanation of the embodiments of the present invention, parts that are not related to the description in the accompanying drawings are omitted. Like parts throughout the specification are labeled with like reference numerals.

The terminology used herein is for the purpose of describing various embodiments and is not intended to be limiting of the present invention. When the first component is said to be "connected (connected, contacted)" to a second component, this means that the first component is "directly connected" to the second component, Quot; indirectly "through < / RTI > The singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is also to be understood that the terms " comprises "or" having ", when used in this specification, mean that there are features, numbers, steps, But does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

[Example 1]

Referring to FIG. 1 (e), the reinforcing structure 7 according to an embodiment of the present invention is made of a fiber reinforced ceramic composite material. A regenerative cooling type flow path 6 (hereinafter referred to as " flow path ") is formed in the reinforcing structure 7. The accompanying drawings show a reinforced structure 7 in the form of a hexahedron for the purpose of facilitating the understanding of the invention, but the reinforced structure 7 may have a complex shape. For example, the reinforcing structure 7 may be in the form of a combustion chamber structure (otherwise referred to as an engine nozzle) shown in Fig. 1 of Patent Document 1. Therefore, the flow path 6 inside the reinforcing structure 7 may also have a complicated shape. The fact that a flow path of a complicated shape can be produced can be understood through the method of forming a fiber-reinforced ceramic composite flow path described below.

The method for forming a fiber-reinforced ceramic composite material flow path of the present invention is a method for forming a flow path in a fiber-reinforced ceramic composite material. However, this method is a method of manufacturing a fiber-reinforced ceramic composite material after forming a flow path, not forming a flow path after manufacturing a fiber-reinforced ceramic composite material.

1 is a schematic view showing a method of forming a fiber-reinforced ceramic composite material flow path according to an embodiment of the present invention. 2 is a flowchart illustrating a method of forming a fiber-reinforced ceramic composite material flow path according to an embodiment of the present invention. Referring to Figures 1 and 2, a method of forming a fiber-reinforced ceramic composite flow path according to one embodiment of the present invention is described.

First, the substructure 1 is prepared (S110, FIG. 1 (a)). The lower structure 1 comprises a polymer resin and reinforcing fibers. The reinforcing fibers are located in the polymeric resin. The polymer resin may include a thermosetting resin. Specifically, the thermosetting resin may include at least one resin selected from the group consisting of a phenol resin, a polyester resin, and an epoxy resin. And the reinforcing fiber can be carbon reinforcing fiber or silicon carbide reinforced fiber only. The lower structure 1 can be manufactured as follows.

3 is a flowchart showing a method of manufacturing the lower structure 1 according to an embodiment of the present invention. Referring to Fig. 3, a method of manufacturing the substructure 1 according to an embodiment of the present invention will be described.

First, a reinforced fiber formed body is prepared (S111). On the material side, the reinforcing fiber-formed body may be a polyacrylonitrile-based molded body, a rayon-based molded body, or a pitch-based molded body. In terms of the shape, the reinforced fiber formed body may be a two-dimensional molded body or a three-dimensional molded body. On the woven side, the reinforcing fiber formed body may be a plain weave reinforced fiber.

Next, the prepared reinforcing fiber preform is coated with pyrolytic carbon (PyC) (S112). The reinforcing fiber preform may be introduced into an electric furnace in which a propane gas and a nitrogen gas atmosphere are formed. The volume ratio of propane gas and nitrogen gas in the furnace may be from 1:10 to 10: 1. In the atmosphere of propane gas and nitrogen gas, the temperature in the furnace rises to 900 to 1000 ° C, and propane gas can be pyrolyzed. Accordingly, the surface of the reinforcing fiber molded body can be coated with the pyrolytic carbon. The carbon on the surface of the reinforcing fiber can prevent oxidation of the reinforcing fiber.

Next, the reinforcing fiber preform coated with the pyrolytic carbon is impregnated with the liquid polymer resin (S113). The impregnation method may be a Vacuum Assisted Resin Transfer Molding (VARTM) method, a Resin Transfer Molding (RTM) method, or a Vacuum Impregnation (VI) method.

In step S113, the reinforcing fiber formed body coated with the pyrolytic carbon may be impregnated with a mixture containing a liquid polymer resin and an additive. The additive may include carbon powder and / or silicon powder. If the additive comprises a carbon powder, then in step S150, if the polymer resin is converted to carbon by heat treatment, the infiltrated silicon reacts with the carbon powder of the additive in addition to the converted carbon to produce silicon carbide particles . If the additive comprises a silicon powder, the silicon powder of the additive in step S150 may react with the carbon converted from the polymer resin to produce silicon carbide particles. If the additive comprises a carbon powder and a silicon powder, the carbon powder and the silicon powder may react to produce silicon carbide particles in step S150. Thereafter, when the molten silicon is infiltrated in step S160, the infiltrated molten silicon may react with the carbon powder of the additive in addition to the carbon converted from the polymer resin to produce silicon carbide particles. When the additive is added in this way, the silicon carbide particles can be reacted more densely (reaction sintering, reaction bonding). Accordingly, the reinforcing structure 7 has a more dense structure, and its mechanical properties can be improved.

Next, the liquid polymer resin is cured to form a cured polymer resin (S114). The reinforced fiber preform impregnated with the liquid polymer resin can be left in an atmosphere of 60 to 100 DEG C, and in this atmosphere, the liquid polymer resin can be cured. Thus, the lower structure 1 is manufactured.

Referring again to FIG. 2, a depression 2 is formed in the prepared lower structure 1 (S120). A portion of the lower structure 1 is depressed to form the depressed portion 2 which is a depressed space. Referring to FIG. 1 (b), an upper part of the lower structure 1 may be recessed. The depressed portion 2 can be formed by machining such as cutting.

Next, the upper structure 4 is prepared (S130). The upper structure 4 may be manufactured in the same manner as the lower structure 1 and may have the same components as the lower structure 1. Optionally, the polymer resin of the lower structure 1 may be referred to as a first polymer resin, and the reinforcing fibers may be referred to as a first reinforcing fiber. Further, the polymer resin of the upper structure 4 may be referred to as a second polymer resin, and the reinforcing fiber may be referred to as a second reinforcing fiber.

Next, a flow path 6 is formed (S140, Fig. 1 (c)). The lower structure 1 on which the depressions 2 are formed is covered with the prepared upper structure 4. Both the depression (2) and the lower structure (1) are covered with the upper structure (4). Particularly, the depressed portion 2 covered with the upper structure 4 becomes the flow path 6. [ In step S140, the depressed portion 2 and the upper structure 4 covering the lower structure 1 may be pressed. By the application of pressure, the upper and lower structures can be joined together.

Next, the upper and lower structures 1 and 4 are heat-treated to carbonize the polymer resin included in the upper and lower structures 1 and 4 (S150, FIG. 1 (d)). Specifically, the upper and lower structures 1, 4 can be loaded into the furnace. Next, a nitrogen atmosphere may be formed inside the furnace. Next, the inside of the furnace can be heated from room temperature to 1000 ° C at a rate of 0.05 to 0.2 ° C / min. In this process, the polymer resin is burned to leave only the carbon component, and the remaining components can be converted to gas. The remaining carbon component may be a carbon matrix of the upper and lower structures 1 and 4 when the amount of the polymer resin is large. In this case, an integral structure 5, including the carbon matrix and the reinforcing fibers located in the carbon matrix, as shown in Fig. 1 (d) can be formed. However, if the amount of polymer resin is small, the remaining carbon component can be a carbon coating layer surrounding the reinforcing fibers.

Finally, the molten silicon penetrates the upper and lower structures 1 and 4 to produce the reinforced structure 7 of the fiber-reinforced ceramic composite material (S160, FIG. 1 (e)). Metal silicon may be placed on the surfaces of the upper and lower structures (1, 4) in the furnace. Next, the inside of the furnace can be raised from room temperature to 1650 DEG C at a rate of 1 to 7 DEG C / min. In this process, the metal silicon may melt and penetrate the upper and lower structures 1, 4. In other words, molten silicon can penetrate the upper and lower structures 1, 4. A portion of the infiltrated fused silicon may react with the converted carbon in step S150 to produce silicon carbide particles. And the infiltrated fused silicon residue can be cured to join the upper and lower structures 1, 4. In the reinforcing structure (7), the matrix becomes cured fused silicon. Inside the matrix, reinforcing fibers and silicon carbide particles are placed. Wherein the silicon carbide particles are positioned between the bundles of reinforcing fibers. In step S150, even if the upper and lower structures 1 and 4 are bonded by the carbon matrix, the carbon matrix reacts with the molten silicon to produce silicon carbide particles. However, in step S160, the upper and lower structures 1 and 4 are firmly bonded by the hardened silicon.

The silicon carbide particles produced in step S160 are reacted and sintered. Therefore, the silicon carbide particle distance in the reinforcing structure 7 is very close. The distance between the silicon carbide particles and the reinforcing fibers in the reinforcing structure 7 is also very close. That is, the reinforcing structure 7 has a dense structure and is excellent in mechanical properties.

In step S120, a depression to be a flow path is formed in the lower structure other than the fiber-reinforced ceramic composite material, and then a reinforced structure of the fiber-reinforced ceramic material is manufactured in step S160. This method is distinguished from the conventional method of forming the flow path through hole processing in the finished fiber-reinforced ceramic composite material. i) Since the lower structure is lower in toughness and strength than the fiber-reinforced ceramic composite material, it is easier to form depressions to be flow paths in the lower structure than to form a flow path in the fiber-reinforced ceramic composite material. ii) Also, the lower structure is open at the top when the depression is formed. Due to the above i) and ii), depressions of complicated shapes can be formed in the substructure, so that a complicated flow path can be formed between the upper and lower structures.

Prior to step S120, the polymeric resin of the substructure is in a cured state. In step S120, a depression is formed in the lower structure including the hardened polymer resin. The shape and dimensions of the dimples are the shape and dimensions of the flow path formed in step S140. Since the depressions are formed in the lower structure including the cured polymer resin in step S120, the shape and dimensions of the flow path are maintained as they are after the pressurization in step S140, the heat treatment in step S150, and the infiltration of silicon melt in step S160.

[Example 2]

In Example 2, unlike Example 1, a flow-through material is used in the flow path formation process. The reinforced structure 7 (Fig. 4 (f)) of the fiber-reinforced ceramic composite material manufactured through the flow path forming method of Example 2 is different from the reinforced structure 7 (Fig. 1 (e) .

4 is a schematic view illustrating a method of forming a fiber-reinforced ceramic composite material flow path according to an embodiment of the present invention. 5 is a flowchart illustrating a method of forming a fiber-reinforced ceramic composite material flow path according to an embodiment of the present invention. Referring to FIGS. 4 and 5, a method for forming a fiber-reinforced ceramic composite flow path according to an embodiment of the present invention will be described. However, the description of the parts overlapping with the embodiment 1 is omitted.

First, the substructure 1 is prepared (S210, Fig. 4 (a)). Next, a depression 2 is formed in the prepared substructure 1 (S220, FIG. 4 (b)). Step S210 is performed in the same manner as step S110, and step S220 is performed in the same manner as step S120.

Next, the formed depressed portion 2 is filled with the flow path filling material 3 (S230, FIG. 4 (c)).

The filler material 3 may comprise at least one material selected from the group consisting of epoxy, PVB (polyvinyl butyral), PVC (polyvinyl chloride), polyester, and polyethylene. These materials are the materials to be heated and removed in the heat treatment in step S260.

The europium filler material 3 may further contain boron nitride in addition to the above materials (epoxy, PVB, etc.). Boron nitride is not removed even if it receives heat in step S260, but it is possible to prevent the molten silicon infiltrated in step S270 from flowing into the flow path 6. [

Next, the upper structure 4 is prepared (S240). Step S240 is performed in the same manner as step S130. Between step S230 and step S240, the surface of the filler material 3 may be polished. By polishing, the surface of the flow path-filling material 3 and the surface of the substructure 1 can be planarized. If the surface of the elongate filler material 3 and the surface of the lower structure 1 are flat, the prepared upper structure 4 may cover the elongate filler material 3 and the lower structure 1 in step S250 .

Next, the flow path filling material 3 filled with the depression 2 and the lower structure 1 are covered with the prepared upper structure 4 (S250, FIG. 4 (d)). When the width of the depressed portion 2 is large, the lower structure 1 alone can not stably support the upper structure 4. Also, when the upper structure 4 is pressed to join the upper and lower structures as in step S140, the portion of the upper structure 4 covering the depression 2 may be broken by the pressure. That is, in a state where the upper structure 4 and the lower structure 1 are not engaged, the flow path filling material 3 serves to stably support the upper structure 4. [

Next, the upper and lower structures 1 and 4 are heat-treated to carbonize the polymer resin included in the upper and lower structures 1 and 4, and at the same time, a flow path 6 is formed (S260, )). Carbonization of the polymer resin by the heat treatment is the same as in the case of step S150. However, in step S260, a process of removing the filler material 3 by heat treatment is added. The space 3 left after the filling material 3 is removed becomes the flow path 6.

However, the expression that the flow-path filling material 3 is removed by heat treatment in step S260 is an accurate expression when the flow-through filling material 3 is a polymer such as epoxy or PVB. As described above, when the flow path filling material 3 further contains boron nitride, the flow path filling material excluding boron nitride is removed by heat treatment.

Finally, the molten silicon infiltrates into the upper and lower structures 1, 4 to produce the reinforced structure 7 of the fiber-reinforced ceramic composite material (S270, FIG. 4 (f)). Step S270 is performed in the same manner as Step S160. Therefore, after proceeding to step S270, the reinforced structure 7 having a dense structure is manufactured.

The molten silicon cured in the flow path 6 can change the shape and dimensions of the flow path 6 when the molten silicon infiltrating into the flow path 6 flows in step S270. However, when the europium filler material 3 further contains boron nitride, the boron nitride remaining in the flow path 6 serves as a barrier for preventing the molten silicon from flowing into the flow path 6. This is because boron nitride pushes out molten silicon.

The flow path forming method of the second embodiment is not a method of forming a flow path in the finished fiber-reinforced ceramic composite material, as in the case of the first embodiment, and therefore, a complicated flow path can be formed according to the second embodiment.

According to the second embodiment, similarly to the first embodiment, in step S220, a depression is formed in the lower structure including the cured polymer resin. The shape and dimensions of the depressions formed in step S220 are the shape and dimensions of the channel formed in step S260. That is, even though the pressing in step S250 and the heat treatment in step S260 are performed, the shape and dimensions of the depressed portion do not change. Particularly, the flow-through material contributes to maintain the shape and dimensions of the depressed portion even if the pressure is increased in step S250. The shape and dimensions of the channel formed in step S260 are maintained even after the silicon melt penetration in step S270.

However, if the elongate filler material further includes boron nitride, the dimension of boron nitride in the dimension of the depression formed in step S220 is? U value (S), which is the dimension of the channel formed in step S260. However, even in this case, S does not change even if it is subjected to pressurization in step S250, heat treatment in step S260, and infiltration of molten silicon in step S270. Hereinafter, a production example will be described.

[Production Example 1]

A polyacrylonitrile-based molding (Toray, T-300) was prepared as a reinforced fiber molding.

Next, the prepared reinforcing fiber preform was charged into an electric furnace. The atmosphere in the furnace was formed of propane gas and nitrogen gas, and the volume ratio of the two gases was set at 1:10. The temperature in the furnace was set at 900 占 폚, and the reinforcing fiber formed body was left for 8 hours. As a result, the reinforcing fiber formed body was coated with pyrolytic carbon.

Next, the reinforcing fiber preform coated with the pyrolytic carbon was impregnated with a mixture of a liquid polymer resin (liquid phenolic resin) and additives (carbon powder and silicon powder). Vacuum impregnation method was used as impregnation method.

Next, the impregnated reinforcing fiber formed body was charged into a dryer. The liquid polymer resin was cured at a set temperature of 80 캜 in a dryer to prepare a substructure.

Next, a portion of the lower structure was cut to form a depression in the lower structure (Fig. 6 (a)).

Next, the formed depression was filled with a flow path filling material (epoxy) (Fig. 6 (b)).

Next, the upper structure was manufactured in the same manner as the lower structure.

Next, the fabricated upper structure was placed on the surface of the elongated filler material and on the surface of the lower structure (Fig. 6 (c)).

Next, the upper and lower structures contacted with each other were charged into the electric furnace. The atmosphere in the furnace was formed of nitrogen gas. The temperature in the furnace was set at 1000 占 폚, and the upper and lower structures were heat-treated at 1000 占 폚. As a result, the polymer resin was carbonized, and at the same time, more than 90 wt% of the eluent material was removed. The space from which the filler material was removed became a channel having a straight section.

Next, a metal silicon powder having a weight of 150% of the weight of the heat-treated upper and lower structures was placed on the surface of the upper structure. The temperature in the furnace was set at 1600 DEG C, so that the metal silicon powder melted and penetrated into the upper and lower structures. The infiltrated silicon was cured to prepare a reinforced structure in which the upper and lower structures were bonded (Fig. 6 (d)).

[Production Example 2]

In Production Example 2, a flow path having a curved cross section, which is more complicated than the flow path of Production Example 1, was formed. Except for this, the method for manufacturing the reinforced structure of Production Example 2 is the same as the method for producing the reinforced structure of Production Example 1 (Figs. 7 (a) to 7 (d)).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be. Therefore, the true scope of the present invention should be defined by the appended claims.

1: Substrate
2: depression
3: Eurofilling material
4: superstructure
5: Structure
6: Euro
7: reinforced structure

Claims (17)

Preparing a substructure comprising a first polymeric resin and a first reinforcing fiber located within the first polymeric resin;
Depressing a portion of the prepared substructure to form a depression in the substructure, the depression being a recessed space;
Filling the formed depression with a filler material;
A second polymeric resin and a second reinforcing fiber located in the second polymeric resin;
Covering the flow path filling material and the lower structure with the prepared upper structure;
Heat treating the upper and lower structures to carbonize the first polymer resin and the second polymer resin; And
Penetrating the upper and lower structures with molten silicon to produce a fiber-reinforced ceramic composite material,
Characterized in that said flow-through material comprises at least one material selected from the group consisting of epoxy, PVB, PVC, polyester, and polyethylene,
And the regenerated cooling flow path is formed in the carbonization step.
The method according to claim 1,
Wherein the first polymer resin and the second polymer resin comprise a thermosetting resin.
3. The method of claim 2,
Wherein the thermosetting resin comprises at least one resin selected from the group consisting of a phenol resin, a polyester resin, and an epoxy resin.
The method according to claim 1,
Wherein the first reinforcing fiber and the second reinforcing fiber are carbon reinforcing fibers or silicon carbide reinforcing fibers.
delete The method according to claim 1,
Wherein the flow-through material further comprises boron nitride.
The method according to claim 1,
The step of preparing the substructure
Preparing a reinforced fiber formed body;
Impregnating the reinforcing fiber preform with a liquid polymer resin; And
And curing the liquid polymer resin to become the first polymer resin.
8. The method of claim 7,
Wherein the reinforcing fiber preform is impregnated with a vacuum resin transfer molding method, a resin transfer molding method, or a vacuum impregnation method in the step of impregnating the reinforced fiber preform.
8. The method of claim 7,
Wherein the step of preparing the substructure comprises:
Between the step of preparing the reinforcing fiber formed body and the step of impregnating the reinforced fiber forming body,
Further comprising the step of coating the prepared reinforcing fiber formed body with pyrolytic carbon.
The method according to claim 1,
Wherein the depressions are formed by machining in the step of forming the depressions.
The method according to claim 1,
Between the step of filling the formed depression and the step of preparing the superstructure,
Further comprising the step of polishing the surface of the flow-through filler material so that the surface of the flow-through filler material and the surface of the lower structure are planarized.
The method according to claim 1,
Wherein in the carbonizing step, the first polymer resin and the second polymer resin are respectively converted into a carbon coating layer surrounding the first reinforcing fiber and the second reinforcing fiber.
The method according to claim 1,
Wherein in the carbonizing step, the first polymer resin and the second polymer resin are converted into carbon matrices of the upper and lower structures.
The method according to claim 1,
In the step of fabricating the fiber-reinforced ceramic composite material, a part of the infiltrated molten silicon reacts with carbon generated in the carbonization step to produce silicon carbide particles, and the infiltrated molten silicon rest is separated from the upper and lower structures Wherein the fiber-reinforced ceramic composite material is cured to be bonded.
delete A fiber-reinforced ceramic composite material comprising a regenerative cooling type flow path formed by the method of claim 1.
An engine nozzle comprising the fiber-reinforced ceramic composite material of claim 16.

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