JP4062882B2 - Method for producing three-dimensional fiber structure and method for producing carbon / carbon composite material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a rotating body-shaped three-dimensional fiber structure and a method for producing a carbon / carbon composite material .
[0002]
[Prior art]
Fiber reinforced composites are widely used as lightweight structural materials. There is a three-dimensional fabric (three-dimensional fiber structure) as a reinforcing material for composite materials. A composite material using this three-dimensional woven fabric as a skeleton material (reinforcing material) and a resin or an inorganic material as a matrix is expected to have a wide range of applications as a structural material for rockets, aircraft, automobiles, ships, and buildings.
[0003]
The shape of the composite material may require a rotating body shape such as a cylinder or a truncated cone. In the case where the shape of the composite material is a rotating body shape, it cannot be produced by simply joining a biaxially oriented laminated yarn group in the X and Y directions with a thickness direction yarn.
[0004]
Japanese Patent Laid-Open No. 6-173139 proposes a method for producing a disk-shaped or donut-shaped three-dimensional fabric using a special three-dimensional fabric loom. In addition, as shown in FIG. 6, JP 2000-202931 A has a θ-direction fiber layer composed of an r-direction fiber layer formed of radially extending r-direction fibers 51 and a θ-direction fiber 52 extending in a ring shape. A method of manufacturing a three-dimensional woven fabric in which the z-direction fibers 53 are passed so as to be laminated and orthogonal to each layer has been proposed. In the three-dimensional fabric, other r-direction fibers 51 a and 51 b are inserted between the outer portions of the r-direction fibers 51.
[0005]
When heat resistance is required for a composite material using a three-dimensional fabric as a reinforcing material, the three-dimensional fabric may be composed of ceramic fibers such as silicon carbide fibers or carbon fibers, and the matrix may be composed of ceramic materials or carbon. is there.
[0006]
[Problems to be solved by the invention]
In the manufacturing method disclosed in JP-A-6-173139, a special three-dimensional weaving loom is used, so that the shape of the fabric that can be manufactured is limited and the manufacturing cost is increased. Also, since the fibers are bent many times during production, the straightness of the fibers that make up the resulting three-dimensional fabric is poor, and it is difficult to increase the fabric density. I can't. In particular, the above-mentioned problem becomes remarkable when fibers that are weak against bending such as carbon fibers and ceramic fibers are used.
[0007]
In the method for producing a three-dimensional fabric disclosed in Japanese Patent Application Laid-Open No. 2000-202931, after the r-direction fiber layer and the θ-direction fiber layer are laminated, the z-direction fibers 53 are passed so as to be orthogonal to each layer. After arranging the r-direction fibers 51 and the θ-direction fibers 52, the z-direction fibers 53 are passed after being pressed to a high density, but it is very difficult to pass the z-direction fibers 53 through the laminated fiber layer after the density is increased. This increases the damage to the fibers. The publication does not disclose a specific method for forming the r-direction fiber layer and the θ-direction fiber layer, but it is difficult to arrange the fibers in a straight state or with a constant curvature at a high density.
[0008]
The present invention was made in view of the above conventional problems, As a purpose is suitable as reinforcement of the composite material of the rotator shape, manufacturing is relatively simple and dense three-dimensional fiber structure An object of the present invention is to provide a method for producing a body and a method for producing a carbon / carbon composite material using the three-dimensional fiber structure .
[0009]
[Means for Solving the Problems]
In order to achieve the first object, according to the first aspect of the present invention, a rod made of a fiber reinforced composite material is radially inserted into a rotating body-shaped resin support, and then the support is made. The yarns are sequentially arranged on the outside of the body along the outer surface, and at least in-plane biaxial orientation including a yarn layer formed of yarns arranged to extend in a direction inclined with respect to the axial direction is obtained. By forming the laminated yarn group, a three-dimensional fiber structure is formed with the rod inserted.
In the manufacturing method of the present invention, the yarns are arranged on the outside of the support in a state where the rods made of fiber reinforced composite material are inserted in the radial direction with respect to the support made of resin in the form of a rotating body. Accordingly, even when the yarn arrangement interval is narrow, the rod can be inserted at a predetermined position of the three-dimensional fiber structure. Since the yarns are sequentially arranged on the outer side of the support, the straightness of the yarns (fibers) is kept good. In addition, since it includes a yarn layer formed of yarns (fibers) arranged so as to extend in a direction inclined with respect to the axial direction, each yarn layer of the laminated yarn group is clamped to the support side due to the presence of the yarn layer. , Arranged in high density.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the support is formed in a cylindrical shape. In the present invention, a cylindrical three-dimensional fiber structure can be easily manufactured.
[0012]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the laminated yarn group includes an axial yarn layer composed of axial yarns arranged in a plane including a central axis of the support. And a circumferential yarn layer composed of circumferential yarns arranged in a plane orthogonal to the central axis. When a composite material is manufactured using the three-dimensional fiber structure manufactured according to the present invention, the strength can be improved both in the axial direction and in the circumferential direction.
[0013]
In the invention according to claim 4, in the invention according to any one of claims 1 to 3, when the laminated yarn group is laminated to a predetermined thickness, the rod is separated from the laminated yarn group by the rod. A rod made of a fiber reinforced composite material having a short length is inserted in the radial direction, and then a laminated yarn group is further formed . Therefore, in the present invention, the density of the three-dimensional fiber structure can be increased even in the radially outer portion, and the strength of the outer portion can be secured when the composite material is manufactured.
[0014]
The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the support is formed of a material that can be burned out, and the yarn constituting the laminated yarn group and the fiber reinforcement. Carbon fiber is used as the reinforcing fiber of the composite material. After the three-dimensional fiber structure manufactured according to the present invention is baked to burn and remove the resin of the support and the rod, a composite material using carbon as a matrix is obtained, whereby a composite material having excellent heat resistance and strength can be obtained. can get.
[0015]
In the invention according to claim 6, in the invention according to any one of claims 1 to 5, the yarns constituting each yarn layer of the laminated yarn group are arranged in a state impregnated with a resin. . In the present invention, the fibers are hardly damaged when the yarns (fibers) are arranged. Further, compared to the case where the resin is impregnated for the first time when the composite material is manufactured, the resin is more easily impregnated between the fibers, and voids (holes) are less likely to be generated.
[0016]
In the invention described in 請 Motomeko 7, after penetration of the resin into a three-dimensional fiber structure manufactured by the manufacturing method of the three-dimensional fiber structure according to any one of claims 1 to 6, and fired To carbonize the resin.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied for a carbon / carbon composite (C / C composite) reinforcement will be described with reference to FIGS. FIG. 1 is a partially broken schematic perspective view of a three-dimensional fiber structure 1, and FIG. 2 is a schematic sectional view. In FIG. 2, hatching indicating a cross section is omitted.
[0019]
As shown in FIGS. 1 and 2, a three-dimensional fiber structure 1 includes a resin-made support body 2 formed in a rotating body shape, and a fiber-reinforced composite material rod 3 inserted radially in the outside thereof. And a laminated yarn group 4 composed of a plurality of yarn layers arranged along the outer surface of the support 2.
[0020]
The support 2 is formed in a cylindrical shape having a desired outer diameter and length and a thickness necessary for holding the rod 3. A number of holes are formed in the support 2 so as to extend in the radial direction, and the rod 3 is inserted and fixed in the holes at the base end. The support 2 may be made of any material that can be burned or carbonized in the C / C conversion process, and a resin is generally used. In this embodiment, the support 2 is made of a phenol resin.
[0021]
The rod 3 is made of a carbon fiber reinforced resin, and a phenol resin is used as the resin. Each rod 3 is formed to have a length that slightly protrudes from the outer surface of the three-dimensional fiber structure 1.
[0022]
The laminated yarn group 4 extends in the axial direction of the support 2, that is, an axial yarn layer composed of axial yarns 5 arranged in a plane including the central axis of the support 2, and is orthogonal to the axial direction. The circumferential yarns 6 arranged in a plane, that is, circumferential yarn layers made of yarns wound in a direction inclined by 90 ° with respect to the axial direction are alternately laminated. That is, in this embodiment, the laminated yarn group 4 is configured to be in-plane biaxial orientation along the outer peripheral surface of the support. The axial yarn 5 and the circumferential yarn 6 are arranged at a predetermined pitch (for example, a pitch of 3 mm). Carbon fibers are used for the yarns 5 and 6. Each carbon fiber is used in a roving (tow) state. The roving means a substantially untwisted fiber bundle in which a large number of thin single fiber filaments are bundled.
[0023]
Next, the manufacturing method of the three-dimensional fiber structure 1 comprised as mentioned above is demonstrated. First, the rod 3 is inserted into the support 2. Next, threads (carbon fibers) are sequentially arranged on the outer surface of the support 2 into which the rod 3 is inserted. For the arrangement of the yarns, an apparatus including a mechanism for supporting and rotating the support 2 and a yarn guide for feeding the yarn and reciprocating along the axial direction of the support 2 is used. A filament winding apparatus may be used as this apparatus. In this case, the support 2 is fixed to a mandrel supported by the filament winding apparatus, or a dedicated jig for supporting the support 2 is used, and the jig is fixed to the chuck of the filament winding apparatus instead of the mandrel. . The yarns are sequentially arranged outside the support 2 by a combination of the rotation of the support 2 and the movement of the yarn guide in the axial direction.
[0024]
When forming the circumferential yarn layer, as shown in FIG. 3A, the yarn fed from the yarn guide 7 is wound around the outside of the support 2 in the circumferential direction as the circumferential yarn 6, and the circumferential yarn. A layer is formed. With the yarn guide 7 stopped at a predetermined position, the support body 2 is rotated once and the circumferential thread 6 is wound around a predetermined position outside the support body 2. The yarn guide 7 is intermittently moved by one pitch every time the circumferential yarn 6 is wound by one turn, and when the circumferential yarn 6 is wound a predetermined number of times, the arrangement (winding) of the circumferential yarn 6 for one layer is wound. ) Is completed.
[0025]
Next, an axial yarn layer is formed. When the axial yarn layer is formed, as shown in FIG. 3B, the rod fed from the yarn guide 7 is extended to the outside of the support 2 along the axial direction as the axial yarn 5. An axial thread layer is formed by being folded back between the three. In this case, while the yarn guide 7 moves from one end side to the other end side of the support body 2, the rotation of the support body 2 is stopped, and when the yarn guide 7 moves to the other end side, the support body 2 is turned by 1 pitch. It is rotated for minutes. Next, the support body 2 is stopped while the yarn guide 7 is moved from the other end side to the one end side of the support body 2. Thereafter, the same operation is repeated, and when the support 2 is rotated once, the arrangement of the axial yarns 5 for one layer is completed.
[0026]
And after the said axial direction thread layer and the circumferential direction thread layer are laminated | stacked by the predetermined layer, and the laminated yarn group 4 is formed, a thread end is stopped by the support body 2, the support body 2 is removed from a filament winding apparatus, and tertiary The original fiber structure 1 is completed.
[0027]
In addition, in each figure, in order to make the arrangement of the threads 5 and 6 easy to understand, the distance between the rod 3 and the threads 5 and 6 is widely expressed. Arranged in close proximity.
[0028]
When the three-dimensional fiber structure 1 configured as described above is used as a reinforcing material for a C / C composite material, the three-dimensional fiber structure 1 is generally baked and the resin of the support 2 and the rod 3 is used. It is burned off and used as a three-dimensional fiber structure composed only of carbon fibers. And after impregnating resin to the three-dimensional fiber structure comprised only with carbon fiber, it bakes and carbonizes resin. When the resin of the support 2 and the rod 3 is a phenol resin, the three-dimensional fiber structure 1 may be used as it is in the C / C conversion step without performing the combustion removal of the resin.
[0029]
This embodiment has the following effects.
(1) The three-dimensional fiber structure 1 is formed in the shape of a rotating body and is arranged so as to be along the outer surface of the support 2 in which the rod 3 made of fiber reinforced composite material is inserted in the radial direction on the outer side. And a laminated yarn group 4 composed of a plurality of yarn layers, and includes a yarn layer constituted by yarns wound in a direction inclined with respect to the axial direction.
[0030]
Therefore, since the yarns constituting the laminated yarn group 4 laminated in the radial direction can be formed on the outer periphery of the support 2 in order from the inside, the production of the three-dimensional fiber structure 1 is simple, The straightness of the fiber) (including the arrangement with a certain curvature) can be maintained well. Further, the yarn layer can be fastened to the support 2 side by the yarn wound in the direction inclined with respect to the axial direction (circumferential yarn 6), and the density of the three-dimensional fiber structure 1 can be easily increased.
[0031]
(2) By making the shape of the support 2 cylindrical, the cylindrical three-dimensional fiber structure 1 can be easily manufactured.
(3) The laminated yarn group 4 includes an axial yarn layer composed of axial yarns 5 arranged in a plane including the central axis of the support 2, and a circumferential yarn 6 arranged in a plane orthogonal to the central axis. A circumferential yarn layer. Therefore, when a composite material is manufactured using the three-dimensional fiber structure 1, the strength can be improved both in the axial direction and in the circumferential direction.
[0032]
(4) The support 2 is made of a material that can be burned down, and carbon fibers are used as the reinforcing fibers of the yarns 5 and 6 and the rod 3 constituting the laminated yarn group 4. Therefore, after the three-dimensional fiber structure 1 is baked and the resin of the support 2 and the rod 3 is burned and removed, a composite material using carbon as a matrix is obtained, thereby obtaining a composite material having excellent heat resistance and strength. It is done.
[0033]
(5) A phenol resin is used as the resin for the support 2 and the rod 3. Therefore, when producing a C / C composite material, it can be used as it is as a resin for carbonization without burning off the resin.
[0034]
(6) Since the ratio of the oriented yarns (fibers) in the thickness direction can be adjusted by changing the number of rods 3 inserted, the three-dimensional fiber structure 1 having various characteristics can be easily obtained. The manufacturing cost of the structure 1 can be reduced.
[0035]
The embodiment is not limited to the above, and may be embodied as follows, for example.
The rod 3 is not necessarily limited to the one inserted into the support body 2 but may include one inserted from the middle of the laminated yarn group 4 in the thickness direction (radial direction). For example, as shown in FIG. 4, a structure in which rods 8 shorter than the rods 3 are inserted between the rods 3 so as to extend in the radial direction in the outer portion of the laminated yarn group 4. When manufacturing the three-dimensional fiber structure 1, first, the rods 3 are inserted into the support 2 and the axial yarns 5 and the circumferential yarns 6 are sequentially arranged in the same manner as in the above embodiment. When the laminated yarn group 4 is laminated to a predetermined thickness, the base end of the rod 8 is inserted into the laminated yarn group 4, and the axial yarn 5 and the circumferential yarn 6 are arranged. In this case, the density of the three-dimensional fiber structure 1, particularly the density of the component in the thickness direction, can be increased even in the radially outer portion, and the strength of the outer portion can be ensured when the composite material is manufactured. In FIG. 4, hatching indicating a cross section is omitted.
[0036]
The rod 8 inserted from the middle of the thickness direction of the laminated yarn group 4 is not limited to the configuration in which the rods 8 are inserted one by one between the rods 3 whose base ends are inserted into the support 2, but the arrangement interval of the rods 3 or the laminated yarn group Depending on the thickness of 4, two or more rods may be inserted, or rods having different lengths may be inserted.
[0037]
The shape of the support body 2 is not limited to a cylindrical shape as long as it is a rotating body shape. For example, a truncated cone shape as shown in FIG. 5B, or a cylindrical shape and a truncated cone as shown in FIG. Or a shape obtained by cutting two locations of a sphere in parallel as shown in FIG. That is, the shape of the three-dimensional fiber structure 1 can be freely changed by changing the shape of the support 2. In addition, illustration of a rod is abbreviate | omitted in FIG.
[0038]
The plurality of yarn layers constituting the laminated yarn group 4 is not limited to the combination of the axial yarn layer formed by the arrangement of the axial yarns 5 and the circumferential yarn layer formed by the arrangement of the circumferential yarns 6, What is necessary is just to include the thread layer comprised by the thread | yarn wound at least in the direction inclined with respect to an axial direction. For example, as shown in FIGS. 5 (a) and 5 (b), in-plane biaxial orientation is achieved only by a yarn layer composed of spiral yarns 9 arranged in a spiral shape at a predetermined angle in the axial direction of the support 2. It is good also as a structure. In addition, a spiral yarn 9 is added to the axial yarn 5 and the circumferential yarn 6 to form an in-plane four-axis orientation configuration, a combination of the spiral yarn 9 and the axial yarn 5, or the spiral yarn 9 and the circumferential yarn 6 It is good also as a structure of in-plane triaxial orientation by the combination. Compared with in-plane biaxial orientation, in-plane triaxial orientation or in-plane tetraaxial orientation improves the shape stability of the three-dimensional fiber structure 1 and improves the strength when the composite material is configured.
[0039]
In the three-dimensional fiber structure 1 including the yarn layer in which the spiral yarns 9 are arranged, the rods 3 may be arranged in a spiral shape with respect to the support 2. In this case, the spiral yarns 9 are arranged smoothly.
[0040]
○ Instead of forming the hole for inserting the rod 3 in the support 2 in advance, the support 2 is formed of a material such as foamed resin that is relatively soft and can be inserted into the rod 3 without forming a hole. You may make it insert the rod 3 in 2 directly. The insertion of the rods 3 is not limited to the method in which all the rods 3 are inserted before starting the yarn arrangement, and the yarns may be arranged while the rods 3 are inserted. In this case, since it is not necessary to form a hole in the support 2 in advance, the number of steps for preparing the support 2 with the rod 3 inserted in a predetermined position is reduced, and the manufacturing time of the three-dimensional fiber structure 1 is reduced. Becomes shorter and productivity is improved. Further, when the insertion density of the rod 3 is changed, it is not necessary to prepare the support 2 having a different number of holes in accordance with the insertion density.
[0041]
The support 2 is not limited to resin and may be formed of paper or wood.
A rod (pin) dedicated to folding the axial thread 5 may be provided on the support 2. In order to increase the density of fibers arranged in the thickness direction, it is necessary to increase the number of rods 3 inserted. In order to increase the number of rods 3 inserted, it is necessary to reduce the thickness of the rods. When the axial thread 5 is folded back while being engaged with the thin rods 3 and the tension is increased, the rods 3 are supported with respect to the support. Thus, the fibers in the thickness direction contained in the rod 3 do not become perpendicular to the axial yarn 5. However, if a rod dedicated to folding the axial thread 5 is provided on the support 2, it can be arranged with the tension of the axial thread 5 increased by increasing the thickness of the rod. The rod dedicated for folding does not need to be fixed in a state orthogonal to the outer peripheral surface of the support 2, and may be fixed in an inclined state in the axial direction.
[0042]
○ When forming the three-dimensional fiber structure 1 that requires heat resistance, the support 2 is formed of a material that can be burned off, and silicon carbide is used as the reinforcing fibers of the yarns 5 and 6 and the rod 3 constituting the laminated yarn group 4 Use ceramic fibers such as fibers. In this case, when the three-dimensional fiber structure 1 is used as a reinforcing material for the composite material, the three-dimensional fiber structure 1 is fired to form a three-dimensional fiber structure composed only of ceramic fibers. Thereafter, a composite material having a structure in which a gap between the fibers of the three-dimensional fiber structure is filled with a ceramic substance is obtained by the CVI method. Also in this case, a composite material excellent in heat resistance and strength can be obtained.
[0043]
○ When used as a reinforcing material for composite materials that do not require much heat resistance, high-strength, high-elasticity fibers, such as glass fibers and aramid fibers, instead of carbon fibers and ceramic fibers as constituent fibers of the three-dimensional fiber structure 1 May be used.
[0044]
○ When a composite material is produced by impregnating the three-dimensional fiber structure 1 with a resin without providing a firing step, the resin constituting the support 2 and the rods 3 and 8 is the same resin as the matrix resin of the composite material. Is preferred. When the same resin is used, the physical properties of the composite material are improved. The resin is not limited to a phenol resin, and may be another thermosetting resin such as an epoxy resin, or a thermoplastic resin without being limited to a thermosetting resin.
[0045]
When arranging the yarns (fibers) constituting each yarn layer of the laminated yarn group 4, the yarns may be arranged in a state where the yarn is impregnated with a resin. In this case, when the yarns are arranged, damage due to the fluffing of the fibers and rubbing of the fibers is prevented. Further, compared to the case where the resin is impregnated for the first time when the composite material is manufactured, the resin is more easily impregnated between the fibers, and voids (holes) are less likely to be generated.
[0046]
The invention (technical idea) that can be grasped from the embodiment will be described below.
(1) A method of manufacturing a three-dimensional fiber structure in place of the carbon-containing fibers, silicon carbide fibers are used.
[0047]
(2) As the yarn wound in a direction inclined with respect to the axial direction, a manufacturing method of three-dimensional fiber structure comprising a spiral thread wound to form a predetermined angle relative to a plane perpendicular to the axial direction.
[0048]
(3) Manufacturing method of the preceding Symbol support and a fiber reinforced composite material of resin as the phenolic resin is three-dimensional fiber structure is used body.
(4) After inserting a rod made of carbon fiber or a ceramic fiber reinforced composite material in a radial direction with respect to a support made of resin in the form of a rotating body, a fiber of the same type as the reinforcing fiber of the rod is placed outside the support. And forming a laminated yarn group having at least in-plane biaxial orientation including a yarn layer formed of yarns arranged so as to extend in a direction inclined with respect to the axial direction. A method for producing a three-dimensional fiber structure, comprising firing the three-dimensional fiber structure.
[0049]
(5) times after insertion of the coal Moto繊-reinforced composite material of the rod in a radial direction relative to the rotating body resin support shape, on the outer side of the support, successively arranged yarn made of carbon fiber Forming a laminated yarn group having at least in-plane biaxial orientation including a yarn layer formed of yarns arranged so as to extend in a direction inclined with respect to the axial direction, and then firing the three-dimensional fiber structure And a method for producing a carbon / carbon composite material that is subjected to a carbon / carbonization treatment including a resin impregnation step.
[0050]
【The invention's effect】
As described above in detail, according to the invention described in claims 1 to 6 , a three-dimensional fiber structure suitable as a reinforcing material for a rotating body-shaped composite material, which is relatively easy to manufacture and has a high density. Obtainable. Moreover, according to the invention of Claim 7, the carbon / carbon composite material using the three-dimensional fiber structure can be obtained.
[Brief description of the drawings]
FIG. 1 is a partially broken schematic perspective view of a three-dimensional fiber structure according to an embodiment.
FIG. 2 is a schematic cross-sectional view showing an arrangement state of rods of a three-dimensional fiber structure.
3A is a schematic perspective view showing an arrangement state of circumferential yarns, and FIG. 3B is a schematic perspective view showing an arrangement state of axial yarns.
FIG. 4 is a schematic cross-sectional view showing an arrangement state of rods according to another embodiment.
5A and 5B are schematic perspective views of a three-dimensional fiber structure according to another embodiment, and FIGS. 5C and 5D are schematic cross-sections of a three-dimensional fiber structure according to another embodiment. Figure.
FIG. 6 is a schematic perspective view of a conventional three-dimensional fiber structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Three-dimensional fiber structure, 2 ... Support body, 3 ... Rod, 4 ... Laminated yarn group, 5 ... Axial direction thread, 6 ... Circumferential direction thread | yarn.

Claims (7)

After inserting a fiber-reinforced composite rod on the outside of the rotating body-shaped support in the radial direction, the yarns are sequentially arranged on the outside of the support along the outer surface thereof in the axial direction. Forming a three-dimensional fiber structure in a state in which the rod is inserted by forming a laminated yarn group having at least in-plane biaxial orientation including a yarn layer formed of yarns arranged so as to extend in a direction inclined with respect to the A method for producing a three-dimensional fiber structure to be formed. The method for manufacturing a three-dimensional fiber structure according to claim 1, wherein the support is formed in a cylindrical shape. The laminated yarn group includes an axial yarn layer made of axial yarns arranged in a plane including the central axis of the support, and a circumferential yarn layer made of circumferential yarns arranged in a plane orthogonal to the central axis. The manufacturing method of the three-dimensional fiber structure of Claim 1 or Claim 2 provided with these. When the laminated yarn group is laminated to a predetermined thickness, a rod made of a fiber reinforced composite material having a shorter length than the rod is inserted in the radial direction into the laminated yarn group, and then a laminated yarn group is further formed. The manufacturing method of the three-dimensional fiber structure as described in any one of Claims 1-3. The said support body is formed with the material which can be burnt down, and the carbon fiber is used for the reinforcement | strengthening fiber of the thread | yarn which comprises the said laminated yarn group, and the said fiber reinforced composite material. The manufacturing method of the three-dimensional fiber structure of description. The method for producing a three-dimensional fiber structure according to any one of claims 1 to 5, wherein the yarns constituting each yarn layer of the laminated yarn group are arranged in a state impregnated with a resin. A carbon / carbon composite in which a resin is infiltrated into a three-dimensional fiber structure produced by the method for producing a three-dimensional fiber structure according to any one of claims 1 to 6, and then fired to carbonize the resin. A method of manufacturing the material .

Images