JP2020117842A - Multilayer fabric made of ceramic fiber and composite material using the same - Google Patents

Abstract

To provide a multilayer fabric made of ceramic fibers, in which its strength is hardly reduced even if it is used in a bent state as an aggregate of a composite material, and to provide a composite material using the same.SOLUTION: In a multilayer fabric made of ceramic fibers, its complete texture is formed of M weft yarns laminated in L layers in the thickness direction and N warp yarns crossing the weft yarns. The multilayer fabric has a bending portion where the weft yarns adjacent to each other are lacking in the warp direction.SELECTED DRAWING: Figure 8

Description

TECHNICAL FIELD The present invention relates to a ceramic fiber multilayer woven fabric having a complete design of wefts laminated in the thickness direction and warps intersecting with the wefts, and a composite material using the same.

Fiber-reinforced composite materials are widely used in various fields such as buildings, aircraft, automobiles, ships, and high temperature furnaces. For applications where heat is not applied, fiber reinforced plastics are used in which a resin matrix is reinforced with fibers. On the other hand, for applications exposed to high temperatures, ceramic-reinforced ceramic composite materials in which a ceramic matrix is reinforced with ceramic fibers are used.

As one form of fiber reinforced composite material, fibers are used in the form of woven fabrics. In woven fabric, the fibers are regularly intertwined. As such, woven fabric is one form of aggregate useful for reinforcing composite materials. Since the woven cloth is in a sheet shape, it is widely used as an aggregate of various composite materials such as a plate shape and a pipe shape.

Patent Document 1 discloses a warp layer that includes fiber groups in a first, second, and third directions that are normally distributed in a fabric and that are orthogonal to each other, and that the fiber groups in the first and second directions are stacked without being woven. And a weft layer to form a layered product, and the upper and lower layers of the layered product are weft layers, and the fiber group in the third direction penetrates the layered product and the weft fibers of the upper and lower parts are formed. A knotting yarn that passes back and forth to fix an internal warp and a weft layer to form a woven fabric, and the woven fabric has a web in which the warp layer and the weft layer are bound together at all thicknesses, and the layered structure. A three-dimensional woven fabric for strengthening a structural material is described, which comprises halves of objects and a flange in which each of the halves of the halves is woven by a second knotting yarn. According to the present invention, not only a reinforcement having a parallelepiped cross section can be obtained, but also a reinforcing fiber having an I, T, J, and Ω cross section can be obtained as a single substance, which is then used as a structural material product. It is described that it can be used.

JP-A-57-176232

A three-dimensional woven fabric for reinforcing a structural material may be used by bending the woven fabric. At this time, the fibers bend so as to buckle inside the curved surface. Highly elastic ceramic fibers are prone to breakage when bent greatly, which causes a decrease in strength. Furthermore, ceramic fiber-reinforced composite materials, which are entirely ceramic, have a higher elastic modulus than fiber-reinforced plastic impregnated with epoxy resin, etc., so deformation is less likely to disperse, stress concentrates, and fiber breakage occurs. It will be easier.

An object of the present invention is to provide a ceramic fiber multi-layer woven fabric whose strength does not easily decrease even when bent and used as an aggregate of a composite material, and a composite material using the same.

The ceramic fiber multilayer woven fabric of the present invention (hereinafter, referred to as “this multilayer woven fabric”) has a complete design with M wefts laminated in L layers in the thickness direction and N warps intersecting with the wefts. A ceramic fiber multi-layer woven fabric, wherein the multi-layer woven fabric has bent portions where the weft yarns adjacent to each other in the warp direction are missing.

The composite material of the present invention (hereinafter referred to as “the composite material”) includes the present multilayer fabric and a matrix.

Since the present multilayer fabric has the bent portion, it is possible to suppress a decrease in strength even when the multilayer fabric is bent at the bent portion. The present composite material can cope with various shapes while suppressing a decrease in strength.

It is a perspective view of the conventional multilayer fabric X. It is the (a) perspective view and the (b) organization chart of the complete organization of the multilayer textile X. It is the (a) perspective view and the (b) organization chart of the perfect organization of modification X'. It is the (a) perspective view and the (b) organization chart of the perfect organization of modification X". It is a perspective view of the conventional multilayer fabric Y. It is the (a) perspective view and the (b) organization chart of the complete organization of the multilayer textile Y. It is a perspective view of multilayer fabric A which is an embodiment of the present invention. It is a perspective view of the multilayer woven fabric A in which the missing weft yarns are indicated by broken lines. It is a side view of the multilayer fabric A from the weft direction. It is a perspective view of multilayer fabric B which is an embodiment of the present invention. It is a perspective view of the multilayer woven fabric B in which the missing wefts are indicated by broken lines. It is a figure which shows the state which weaves the multilayer fabric B with a dobby loom. (A) is a perspective view and (b) is a schematic side view. FIG. 7 shows changes in the weft yarn and the warp yarn when the multilayer fabric A is bent, (a) and (b) before being folded, and (c) is a sectional view after being folded. The change of the weft yarn and the warp yarn when bending the multilayer fabric X is shown, (a) is a cross-sectional view before bending and (b) is after bending.

Hereinafter, the present invention will be described with reference to the embodiments of the present invention illustrated in the drawings. The present invention is not limited to the specific embodiments described in this document and the drawings, but can be variously modified according to the purpose and application.

1. Ceramic fiber multilayer fabric

An example of a conventional multilayer fabric is shown in FIGS. 1 and 5. In the conventional multi-layer fabrics X and Y, a plurality of wefts (1) of ceramic fibers are laminated in the thickness direction (three layers in the multi-layer fabric X and six layers in the multi-layer fabric Y), which are woven by the warp yarns (2) of the ceramic fibers. I am adjusting. In this document, "warp" means a thread in the winding direction of a loom, and "weft" means a thread in a direction orthogonal to the weft. Further, the warp yarns are arranged side by side in a plan view, and the weft yarns are arranged in a stack of a plurality of weft yarns.

The "complete design" is the smallest unit that constitutes a woven fabric. The region surrounded by the broken line in FIGS. 1 and 5 is a complete design, and the multilayer fabric X has a complete design (3) of 2 units in the warp direction and 4 units in the weft direction. The multilayer woven fabric Y has a complete design (3) of 2 units in the warp direction and 2 units in the weft direction.

2 and 6 show the complete design of the multilayer fabrics X and Y. (A) is a perspective view. The numbers in FIG. 2(a) indicate the positions of the warp yarns with respect to the weft yarns of a plurality of layers. That is, the number “α” (α; 1 to the number of layers of wefts, “3” in FIG. 2) indicates that the warp yarns are below the weft yarns constituting the αth layer (hereinafter referred to as “αth layer weft yarns”). It shows that it is located. For example, in (a), "1" means that the warp is located below the first layer weft. On the other hand, in (a), "0" means that the warp floats above the first layer weft and appears on the first surface. In this document, the "first surface" means the surface on one side of the multilayer fabric, and the "second surface" means the surface on the opposite side. The "first layer weft" means a weft that constitutes the first layer (a layer on the first surface), and among the wefts that are stacked, the second layer from the first layer weft toward the second surface. Weft, 3rd layer weft,... In FIG. 2, the weft yarn forming the second surface layer is the third layer weft yarn.

FIGS. 2 and 6(b) are organization charts of a complete organization, and individual squares schematically show points at which warps and wefts intersect (interlaced points). The black squares indicate the interlaced points where the warp floats above the first layer weft and appears on the first surface, and is called the “texture point”. The numbers have the same meaning as in (a). In a general multi-layer fabric, one design point exists in each row in the warp direction and the weft direction in one complete design. The positions of the tissue points may be arranged in any manner based on the above rules. Various patterns are formed depending on the arrangement of the tissue points. For example, in the multilayer fabric X shown by the matrix of (6, 6), the organization point exists at the position of (i, i) (i=1 to 6). Moreover, in the multilayer fabric Y represented by the matrix of (12, 12), the organization point exists at the position of (i, i) (i=1 to 12).

3 and 4 show the complete designs of the modified examples X′ and X″ of the multilayer woven fabric X. (a) is a perspective view and (b) is a design diagram. The numbers have the same meanings as the squares and numbers in Fig. 2(b) The arrangement points of the design points are different between the modified examples X'and X" and the multilayer fabric X.

FIG. 14 shows changes in the weft yarn and the warp yarn when the multilayer fabric X (three-layer structure) is bent. (A) is sectional drawing before bending, (b) is sectional drawing after bending. In (a) and (b), only one warp (1) is shown. In the multi-layer fabric X, since three layers of wefts (2) are laminated, the wefts (2) are closely spaced on the inner side and sparse on the outer side. Along with this, a large tension is applied to the warp (1), and the load on the weft (2) is increased. Further, since the warp yarn is strongly compressed inside the bent portion, the warp yarn (not shown) in the corresponding portion is likely to buckle. As a result, fiber breakage is likely to occur.

7 and 8 show a multilayer woven fabric A which is an embodiment of the present invention, and FIGS. 10 and 11 show a multilayer woven fabric B which is another embodiment. The complete design of the multilayer woven fabric A is composed of 18 wefts laminated in 3 layers in the thickness direction and 6 warps intersecting with the wefts. The complete design of the multilayer woven fabric B is composed of 72 wefts laminated in 6 layers in the thickness direction and 12 warps intersecting with the wefts.

The number of layers of the present multi-layered fabric is not particularly limited as long as it is two or more, and the number of layers can be various if necessary. Specifically, the number of layers can be, for example, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or more.

In this multilayer woven fabric, a complete design is composed of M wefts laminated in L layers in the thickness direction and N warps intersecting with the wefts (L, N, M; integers of 2 or more). The relationship between the number of layers of the complete design (L) and the number of wefts (M) and the number of warps (N) forming the complete design is not particularly limited. L, M, and N can be various numerical values as needed. In this multilayer woven fabric, it is preferable that M=2L ² and N=2L. In the multilayer fabric A, L=3, M=2×3 ² =18, and N=2×3=6. In the multilayer fabric B, L=6, M=2×6 ² =72, N=2×6=12.

In the complete design of the multilayer woven fabric B in which L=6, the position of the warp intersecting with the set of wefts laminated is sequentially described as the position α of the warp with respect to the plurality of layers of wefts described above, 0, 1, 2, It becomes 3,4,5,6,5,4,3,2,1. “Α=0”, “α=6” appear once, and “α=1” to “α=5” appear twice. That is, the total number of warp yarns (N) of the complete design is 12 and N=2L. As with the warp, 12 sets of wefts are required, and each weft group has 6 layers, so that 72 wefts and M=2L ² . This is not limited to 6 layers, and any number of layers can be similarly applied.

This multilayer woven fabric has a bent portion in which weft yarns adjacent to each other in the warp direction are missing. The multilayer fabric can be formed into various shapes by appropriately bending it at the bending portion.

The bent portion of the multilayer fabric A is shown in FIGS. In FIG. 8, for comparison with the conventional multi-layer fabric, the weft yarns missing in the bent portion are indicated by broken lines. In FIG. 9, “●” indicates a position where the weft exists, and “◯” indicates a position where the weft is missing. The positions of the sixth and seventh (f, g) wefts in FIGS. 7 and 8 and the positions f, g in FIG. 9 correspond to the bent portion (4). The number of missing wefts is 6th from the top (position f in FIG. 9); 1st, 7th (position g from FIG. 9);

If the wefts are present, “1”, and if not, “0” is described using an array for each weft group of the multilayer fabric A. In the weft group at the position a, (1, 1, 1), position f In the case of the weft yarn group of, it becomes (0, 1, 1). The positions a to l of the multi-layer fabric A are described using an array as follows.
(1,1,1): a to e, h to l
(0, 1, 1): f, g

FIG. 13 shows changes in the weft yarn and the warp yarn when the multilayer woven fabric A is bent at the bending portion. (A) and (b) show the state before bending. In (a), for convenience, the positions of the missing wefts are also shown. In (a), “●” indicates a position where the weft exists, and “◯” indicates a position where the weft is missing. In (a) and (b), only one warp is shown. The multilayer woven fabric A is bent so that it is convex upward at the position where the warp is highest.

13(a) and 13(b), in the state before bending, since the warp (2) of the bent portion (4) has no warp at the bending position, the warp (2) floats over two wefts. From (c), after bending, since the weft (1) is missing in the bent portion (4), the woven fabric is originally thin, and the elongation of the weft (1) due to bending is equal to the length of two wefts. Since it is possible to disperse the weft yarn (1), the load on the weft yarn (1) can be reduced. As a result, in the present multilayered fabric, it is possible to suppress a decrease in strength when folded (the description is the opinion of the inventor, and is not a statement to the effect of limiting or defining the present invention, but its intention. Nor.).

The bent portion of the multilayer fabric B is shown in FIGS. In FIG. 11, for comparison with the conventional multi-layered fabric, the wefts missing in the bent portion are shown by broken lines. The positions of the third to ninth (c to i) wefts in FIGS. 10 and 11 correspond to the bent portion (4). The number of missing wefts is the third from the top (position c in FIG. 11); the first, fourth (position d in FIG. 11); second, fifth (position e in FIG. 11); third and sixth (Position f in FIG. 11); 4th, 7th (position g in FIG. 11); 3rd, 8th (position h in FIG. 11); 2nd, 9th (position i in FIG. 11); is there.

Each weft group of the multi-layered woven fabric B is expressed in the same manner as the multi-layered woven fabric A, using the arrangement as follows. The missing parts of the wefts, c to i, are the bent portions, and although they are not described before a and after m, they can have an arbitrary arrangement.
(1,1,1,1,1,1,1): a, b, j to m
(0,1,1,1,1,1):c,i
(0,0,1,1,1,1): d, h
(0,0,0,1,1,1): e, g
(0,0,0,0,1,1): f

The multilayer fabrics C to H, which are other embodiments of the present invention having different structures of the bent portions, will be described. Similar to the multi-layered fabric B, each of the multi-layered fabrics C to H has six weft layers laminated in the thickness direction.

When each weft group of the multilayer woven fabric C is similarly shown by using the arrangement, it is as follows. The parts c to k in which the wefts are missing are bent portions, and although they are not shown before a and after m, they can have an arbitrary arrangement. The multi-layer woven fabric C lacks the weft yarn one layer deeper than the multi-layer woven fabric B.
(1,1,1,1,1,1,1): a, b, l, m
(0,1,1,1,1,1):c,k
(0,0,1,1,1,1): d,j
(0,0,0,1,1,1): e,i
(0,0,0,0,1,1): f,h
(0,0,0,0,0,1): g

When each weft group of the multilayer woven fabric D is similarly shown by using the arrangement, it is as follows. The parts c to m in which the wefts are missing are bent portions, and any arrangement can be taken before a and after o. In the multi-layer fabric D, the weft is missing one layer deeper than the multi-layer fabric C, and there is a portion h in which all the wefts are missing.
(1,1,1,1,1,1,1): a, b, n, o
(0,1,1,1,1,1):c,m
(0,0,1,1,1,1): d,l
(0,0,0,1,1,1): e,k
(0,0,0,0,1,1): f,j
(0,0,0,0,0,1): g,i
(0,0,0,0,0,0): h

The weft yarn groups of the multilayer woven fabric E are shown below using the same arrangement. Although the missing parts of the wefts, c to i, are bent parts, and they are not described before a and after k, they can have any arrangement. The multi-layered woven fabric E is different from the multi-layered woven fabric B in that wefts are missing from both sides, and there is a part f in which all the wefts are missing.
(1,1,1,1,1,1): a, b, j, k
(0,1,1,1,1,1):c,i
(0,0,1,1,1,0): d, h
(0,0,0,1,0,0): e, g
(0,0,0,0,0,0): f

The weft yarn groups of the multilayer woven fabric F are shown below using the same arrangement. Although g to i in which the wefts are missing are bent portions and are not described before a and after m, any arrangement can be adopted. In the multi-layer woven fabric F, all the wefts are missing in the weft group h, and half of the wefts are missing on both sides.
(1,1,1,1,1,1,1): a to f, j to m
(0,1,0,1,0,1): g,i
(0,0,0,0,0,0)h

When each weft group of the multi-layer fabric G is similarly shown by using an array, it is as follows. Although the wefts lacking c to i are bent portions and are not described before a and after k, any arrangement can be adopted. In the multi-layered fabric F, one layer of the missing wefts is one layer shallower than the multi-layered fabric E, and there is no part where all the wefts are missing.
(1,1,1,1,1,1,1): a to c, i to k
(0, 1, 1, 1, 1, 1): d, h
(0,0,1,1,1,0): e, g
(0,0,0,1,0,0): f

The weft yarn groups of the multi-layer fabric H are shown below by using the same arrangement. The missing parts of the wefts, c to i, are the bent portions, and although they are not described before a and after m, they can have an arbitrary arrangement. The multi-layer fabric H has a structure in which the weft yarns in the surface layer portion of the multi-layer fabric B are left out while the weft yarns are omitted in a V shape.
(1,1,1,1,1,1,1): a, b, j to m
(0,1,1,1,1,1):c,i
(0,0,1,1,1,1): d, h
(1,0,0,1,1,1): e, g
(1,1,0,0,1,1): f

In the present multilayer woven fabric, the bent portion can be provided at any position in the present multilayer woven fabric. Further, the bent portion may be provided at only one place in the present multi-layered fabric, or may be provided at two or more places. When two or more bent portions are provided, they may be provided only on the first surface side or the second surface side, or may be provided on both the first surface side and the second surface side. Specifically, for example, in the multilayer fabrics A to D, one bent portion is provided on the first surface side. On the other hand, in the multilayer woven fabrics E and G, the bent portions are provided at the positions facing the first surface and the second surface, respectively, and the number of weft yarns missing toward the inner layers is gradually reduced.

In the multilayer woven fabric, the bent portion is not particularly limited in its specific constitution as long as it has a constitution in which weft yarns adjacent to each other in the warp direction are omitted. The number of missing weft yarns is not limited as long as they are adjacent to each other in the warp direction, and can be an appropriate number in consideration of the required width of the bent portion and the like, for example, 2 The number can be three or more, four or more. The upper limit of the number can be, for example, 20 or less, 18 or less, 16 or less.

In the bent portion, there may be only one layer in which the weft yarns adjacent to each other in the warp direction are missing like the multilayer fabric A (FIGS. 7 to 9), but as in the multilayer fabric B (FIGS. 10 and 11), etc. In addition, it is preferable that the weft yarns adjacent to each other in the warp direction are missing over a plurality of layers. Further, as in the multilayer fabric B (FIGS. 10 and 11) and the like, two or more layers adjacent to each other in the warp direction may be continuous, or like the multilayer fabric F, such layers may be continuous. It does not have to be continuous.

In the bent portion, the number of wefts missing in each layer may be the same or different. For example, the number of missing wefts in the layer having the bent portion may be the same as the number of missing wefts in the other layer, particularly in the layer immediately below the certain layer, or may be more or less. Good. Specifically, for example, as shown in the multilayer fabrics B to E and G, the number of weft yarns missing in each layer may be different. Further, as shown in the multi-layered fabrics F and H, the number of missing weft yarns may be the same in one layer and the other layer.

There is no particular limitation on the weft missing pattern in the bent portion. For example, as shown in the multi-layered fabrics A and B (FIGS. 7 to 11) and C and D, the number of missing weft yarns may gradually decrease from the first surface toward the inner layer. .. On the contrary, a pattern (bent portion on the second surface side) in which the number of the missing weft yarns gradually decreases from the second surface toward the inner layer may be formed. When the bent portions are provided at positions facing the first surface and the second surface of the multilayer fabric, respectively, as shown in the multilayer fabrics E and G, one of the bent portions extends from the first surface to the second surface. Toward the second surface, the number of the missing wefts is gradually reduced, that is, the number of the missing wefts is gradually increased from the first surface to the second surface. The number of wefts missing from the first surface and the second surface toward the inner layer can be gradually reduced.

Further, as in the multilayer woven fabric H, in a certain layer, two wefts adjacent to each other in the warp direction may be omitted, and the wefts may be sandwiched between two or more patterns. The number of weft yarns between the structures can be appropriately set as needed. The number is usually 1 or more, preferably 1 to 5.

The ceramic fiber is not particularly limited in material as long as it is a fiber made of ceramics. Examples of the ceramic fiber include silicon carbide fiber, carbon fiber, alumina fiber, mullite fiber, and silica fiber.

The materials of the ceramic fibers forming the weft and the warp may be the same or different. For example, all the wefts and warps may be ceramic fibers of the same material, or all the wefts may be ceramic fibers of the same material and all the warps may be ceramic fibers of a different material than the wefts. Further, as the weft, two or more ceramic fibers made of different materials may be used together, and similarly, as the warp, two or more ceramic fibers made of different materials may be used together.

The ceramic fiber may be a ceramic fiber bundle obtained by bundling a plurality of ceramic fibers. When the ceramic fibers are bundled and exist in a bundle, it is difficult to form a space between the ceramic fibers, so that the existence ratio of the ceramic fibers in the ceramic composite material can be increased and a high-strength ceramic composite material can be obtained. The number of ceramic fibers constituting the ceramic fiber bundle is not particularly limited, and may be 100 to 5000, for example.

In the present invention, weaving and warp weaving are not specifically limited as long as the weave of the multi-layered fabric can be maintained.

There is no particular limitation on the method for producing the present multilayer fabric. The present multi-layer woven fabric can be manufactured by an ordinary loom, for example, a dobby loom that can raise and lower a plurality of warps in cooperation, or a jacquard loom that can individually control a plurality of warps. The Toby loom is suitable for producing a woven fabric having a simple pattern. On the other hand, when the number of warp yarns having a complete design is large or the multilayered fabric having a repeating structure is not used, it is preferable to weave with a jacquard loom.

As a manufacturing example of the present multilayer fabric, a state in which the multilayer fabric B is woven by a dobby loom is shown in FIG. On the back beam (5), the number of warps necessary for manufacturing the multilayer woven fabric B is simultaneously wound. The warp yarn (2) is fed from the back beam (5) side toward the cross beam (6) side, and the weft yarn (1) is woven between the warp yarns (2) during the feeding process. As many heddles (7) as the number of warp threads (2) included in the complete design are used, and the warp threads (2) at the same position in the complete design move up and down in cooperation with each other. The heddle (7) is moved up and down according to the pattern of the organization chart, and the weft yarn (1) wound around the shuttle (8) passes between the predetermined warp yarns (2) to form a multilayer woven fabric. By stopping the shuttle (8) for driving the weft, the weft (1) can be omitted from the woven structure. Therefore, the bent portion can be formed by stopping the shuttle (8) at a desired position and removing the weft (1) from the woven structure.

2. Ceramic composites

The ceramic composite material of the present invention (hereinafter, simply referred to as “the present composite material”) is not particularly limited in its specific constitution as long as it includes the present multilayer fabric and matrix. The present composite material is usually formed by using the present multilayer fabric as an aggregate and infiltrating the matrix material into the aggregate.

The material of the matrix is not particularly limited. Examples of the matrix include a ceramic matrix. Specifically, from the viewpoint of heat resistance and the like, it is preferably at least one matrix selected from the group consisting of graphite, carbon, silicon carbide, alumina, silicon nitride, and aluminum nitride. When the matrix is a ceramic matrix, the material of the ceramic forming the matrix may be the same as or different from the material of the ceramic forming the ceramic fibers.

The matrix may contain other components and/or members as required. For example, the matrix may include hollow bodies.

There is no particular limitation on the method for producing the present composite material. The present composite material is usually produced by forming a matrix on the present multilayer woven fabric which is an aggregate by a known method. Specifically, for example, the present composite material can be produced by impregnating the present multilayer fabric with a slurry containing a matrix material or a matrix precursor and then firing the slurry. Further, the present composite material can be produced by introducing a heated matrix material raw material gas into the present multilayer fabric in the CVD furnace and bringing the gas into contact with the present multilayer fabric.

The use of the composite material is not particularly limited. The present composite material can be used in fields in which known fiber-reinforced composite materials are used, for example, buildings, aircraft, automobiles, ships, high temperature furnaces and the like. The shape of the member formed from the present composite material is not particularly limited, and can be various shapes depending on the application. As described above, the present multi-layered woven fabric, which is an aggregate of the present composite material, has the above-mentioned bent portion, so that the strength thereof is not easily reduced even when it is bent and used. Therefore, it is preferable that the member formed from the present composite material has a shape bent at the bent portion.

X, Y; conventional multi-layered fabrics, X′ and X″; variations of multi-layered fabric X, A, B; multi-layered fabrics according to embodiments of the invention. 1; weft, 2; warp, 3; complete design, 4; Bent portion, 5; back beam, 6; cross beam, 7; heddle, 8; shuttle.

Claims (7)

A ceramic fiber multilayer woven fabric having a complete design composed of M wefts laminated in L layers in a thickness direction and N warps intersecting with the wefts,
The multi-layered woven fabric is a ceramic fiber multi-layered woven fabric having bent portions where the weft yarns adjacent to each other in the warp direction are missing. The ceramic fiber multilayer woven fabric according to claim 1, wherein the weft yarn is missing in a plurality of layers in the bent portion. The ceramic fiber multilayer woven fabric according to claim 1 or 2, wherein in the bent portion, the number of the weft yarns to be cut off from the first surface or the second surface of the multilayer woven fabric toward the inner layer is gradually reduced. The ceramic fiber multilayer woven fabric according to any one of claims 1 to 3, wherein the bent portion is provided at a position facing each of the first surface and the second surface of the multilayer woven fabric. The M wefts laminated in the L layer in the thickness direction and the N warps intersecting with the wefts are respectively
M=2L ² and N=2L
The ceramic fiber multilayer woven fabric according to any one of claims 1 to 4, which satisfies the above condition. A composite material comprising an aggregate and a matrix comprising the ceramic fiber multilayer woven fabric according to any one of claims 1 to 5. 7. The composite material according to claim 6, wherein the matrix is made of ceramic.