CN112373137A - High-flux preparation method of gradient sewing density fabric for ceramic matrix composite material - Google Patents

High-flux preparation method of gradient sewing density fabric for ceramic matrix composite material Download PDF

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CN112373137A
CN112373137A CN202011158769.8A CN202011158769A CN112373137A CN 112373137 A CN112373137 A CN 112373137A CN 202011158769 A CN202011158769 A CN 202011158769A CN 112373137 A CN112373137 A CN 112373137A
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sewing
suture
line
fabric
weft
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CN112373137B (en
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李军平
龚晓冬
金恩泽
孙新
张国兵
李钰梅
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Aerospace Research Institute of Materials and Processing Technology
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Aerospace Research Institute of Materials and Processing Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/105—Ceramic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The invention provides a high-flux preparation method of a gradient sewing density fabric for a ceramic matrix composite, which is characterized in that sewing positions are arranged according to designed geometric figure parameters and a calculation formula, the sewing positions are printed and covered on the surface of the fabric, and the fabric with the sewing space in gradient change is obtained by sewing. By the method, the influence rule of different stitching distances on the material performance can be rapidly acquired, and a database of the system is established. Compared with the traditional method, at least 4 typical sewing intervals are selected as investigation objects, the method can realize that all kinds of sewing intervals are from one flat plate, the number of input subsamples is reduced by over 75%, and the research and development cost is greatly reduced. In addition, the ceramic matrix composite material has long development period and complex process, and the data obtained by the same flat plate obviously reduces the process noise and improves the accuracy of the data.

Description

High-flux preparation method of gradient sewing density fabric for ceramic matrix composite material
Technical Field
The technology relates to a high-flux preparation method of gradient sewing density fabric for a ceramic matrix composite material, belonging to the field of functional composite materials and processes.
Background
The ceramic matrix composite has very important application value in the field of aerospace due to the characteristics of high temperature resistance, light weight and high strength. However, the traditional trial and error method is still adopted in the research and development and application of the ceramic matrix composite at the present stage, the cost is high, the period is long, and the development progress of the material is greatly restricted. The two-dimensional fiber cloth laying-sewing structure is a common structure of the ceramic matrix composite fabric at the present stage, the sewing distance is one of important structural parameters of the ceramic matrix composite fabric structure, and the two-dimensional fiber cloth laying-sewing structure has important influence on various performances of the material, such as mechanics, heat transfer and the like. At present, a plurality of sewing interval parameters are often set, and typical test pieces are put into the sewing interval parameters for material development and performance evaluation. And other parameters are estimated by interpolation, if the parameters are unreasonably set or typical parameters are few and a complete and credible curve is not obtained, data needs to be supplemented, the supplemented data is often influenced by the fluctuation of the development process, and the period and the cost are greatly increased. Therefore, the development of the ceramic matrix composite needs to be improved, the development process of the material is accelerated, more abundant data is mastered, and systematic data support is provided for the early large-scale application of the material.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art and provides a high-flux preparation technology of the sewing density of the ceramic matrix composite fabric.
The technical solution of the invention is as follows:
a high-flux preparation method of gradient sewing density fabric for ceramic matrix composite material comprises the following steps:
(1) according to the sewing interval range n to be inspecteda～nbDesigning a suture position map with gradient distribution, wherein na＜nb；
(2) And (3) printing 1: 1 sewing position diagram;
(3) selecting fiber cloth subjected to layering, wherein the number of layers is determined according to the thickness of single-layer fiber cloth and the volume of a forming cavity, and the size of the fiber cloth needs to be wrapped by the sewing position graph printed in the step (2);
(4) laying the fiber cloth blanked in the step (3) to form a semi-formed fabric, and fixing the sewing position diagram printed in the step (2) on the surface of the semi-formed fabric after laying to form the semi-formed fabric with the sewing position mark;
(5) and sewing the semi-formed fabric with the sewing position mark, and sewing along the sewing mark to obtain the two-dimensional ply-sewing structure fabric with the sewing space distributed in a gradient manner.
Further, the step (1) designs a suture position map with gradient distribution, specifically comprising:
(a) designing an isosceles triangle, establishing a central line, dividing the bottom edge of the triangle into x line segments with equal length, wherein the length of each line segment is n1，n1≤naThe total length of the first weft-wise sewing thread is x.n1(ii) a Starting from the vertex, drawing a ray of x line segment endpoints on the first weft stitching line, wherein the ray is called a warp stitching line;
(b) a line segment parallel to the first latitudinal suture line is made outside the first latitudinal suture line, and the end points of the line segment are on the extension lines of two sides of the isosceles triangle, so that the line segment is called as a second latitudinal suture line; the distance between the second weft sewing thread and the first weft sewing thread is n1；
Assuming that the first weft stitching thread has a height L from the vertex0The x line segment size divided by the radial sewing line in the step (a) in the second weft sewing line is the sewing distance on the weft sewing line
Figure BDA0002743620570000021
(c) Similarly, a third weft sewing thread is made, and the distance between the third weft sewing thread and the second weft sewing thread is n2And the internal suture spacing of the third weft suture
Figure BDA0002743620570000022
(d) And the like, making the ith latitudinal suture line, wherein the distance between the ith suture line and the (i-1) th suture line is ni-1Inner stitch spacing of i-th weft stitch line
Figure BDA0002743620570000023
Wherein 1 is<i≤m；
(e) The inner sewing distance n of the mth sewing threadmMaximum stitching spacing n enveloping the required studybExtending each warp suture line to form a suture position distribution diagram of the warp suture lines and the weft suture lines which are staggered and distributed in a gradient grid manner; finally, along the first weft stitching line, the portion of the upper portion containing the apex is cut away.
Further, in the step (2), the density of the paper surface for printing the stitch position is 50g/m2～60g/m2White with a thickness less than or equal to 0.05 mm.
Further, in the step (3), the fiber cloth is carbon cloth, silicon carbide, glass fiber cloth or other ceramic matrix composite material fiber cloth.
Furthermore, the fabric to be sewn is formed by laying two-dimensional fiber cloth or needling the fabric.
Further, when the stitching is performed in the step (5), the stitching thread adopted is carbon fiber T300-1K or 3K, silicon carbide fiber or other ceramic fiber.
Furthermore, when the suture is performed in the step (5), a manual suture mode is adopted. The suture is single-stranded or double-stranded. And sewing along weft sewing lines and sewing points marked in the drawing. The paper on the surface of the seamed fabric is removed during the subsequent heat treatment stage of the fabric.
Compared with the prior art, the invention has the following beneficial effects:
(1) the sewing distance of the fabric is determined by the calculation formula provided by the invention, so that the sewing distance of each area can be calculated and measured and verified, and the subsequent simulation is facilitated.
(2) Printing by thin-wall paper to obtain a printing result 1: 1, the difficulty of marking by operators is reduced, the accuracy of the sewing position is improved, the influence of the thin-wall paper on the thickness of the fabric is reduced, and the deviation degree of the sewing line is relieved.
(3) Increase L0The gradient of the stitching space is reduced, and the distribution is more continuous; n is1The suture interval gradient is reduced, and the distribution is more continuous; x increases and the fabric size increases. By adjusting the three parameters, the data of the stitching density can be richer and more continuous.
(4) Compared with the traditional method which selects more than 4 typical suture intervals as the investigation objects, the method can realize that one flat plate simultaneously obtains a large amount of suture interval parameters, the number of subsamples is reduced by more than 75%, the research and development cost is greatly reduced, and the data volume is richer and more systematic.
(5) The ceramic matrix composite material has long development period and complex process, and the data obtained by the same flat plate obviously reduces the process noise and improves the accuracy of the data.
(6) While the stitching space in the plane is in gradient distribution, the stitching space can be coupled with structural parameters such as fiber volume content and the like out of the plane, so that the gradient distribution of multi-dimensional structural parameters is realized, namely the high-throughput preparation of the multi-dimensional gradient fabric structure composite material is realized.
Drawings
FIG. 1 is a layout of an isosceles triangle warp and weft suture;
FIG. 2 is a schematic view showing the spacing between the 1 st and 2 nd stitches;
FIG. 3 is a schematic view of a suture position;
FIG. 4 is a schematic view showing a sewing position of embodiment 1;
FIG. 5 is a schematic view showing a sewing position in embodiment 2;
FIG. 6 is a schematic view of a partial suture of example 2 and its dimensions.
Detailed Description
The invention provides a high-flux preparation method of a gradient sewing density fabric for a ceramic matrix composite, which comprises the following steps:
(1) according to the sewing interval n to be inspecteda～nb(na＜nb) Range, design gradient distributed suture location map:
(a) designing an isosceles triangle, establishing a central line, dividing the bottom edge of the triangle into x line segments with equal length, wherein the length of each line segment is n1(n1≤na) The total length of the first weft-wise sewing thread is x.n1. Starting from the vertex, a ray is drawn of the x line segment endpoints on the first stitch line, which is called the warp stitch line, as shown in FIG. 1.
(b) And a line segment parallel to the first weft sewing line is made outside the first weft sewing line, and the end points of the line segment are on the extension lines of two sides of the isosceles triangle, so that the second weft sewing line is called as the second weft sewing line. The distance between the second weft sewing thread and the first weft sewing thread is defined as n1. Assuming that the first weft stitching thread has a height L from the vertex0. The x line segment size of the second weft sewing line divided by the radial sewing line in the step (1) (a) is the sewing distance on the weft sewing line
Figure BDA0002743620570000041
As shown in fig. 2.
(c) Similarly, a third weft stitch is provided, which is spaced from the second stitch by a distance n2. Internal stitch spacing of third weft stitch line
Figure BDA0002743620570000051
(d) And analogizing in turn, and making the ith weft-wise suture line, and defining that the distance between the ith suture line and the (i-1) th suture line is ni-1. Similarly, the internal sewing distance of the ith weft sewing thread
Figure BDA0002743620570000052
(wherein 1)<i≤m)。
(e) The inner sewing distance n of the mth sewing threadmMaximum stitching spacing n enveloping the required studybAnd (4) finishing. And extending each warp suture line to form a suture position distribution diagram with the warp suture lines and the weft suture lines staggered and distributed in a gradient grid. Finally along the first weft stitching line,the upper part containing the apex is trimmed away as shown in figure 3.
All geometric figure parameters can be adjusted, so that the data is richer: such as increasing L0Or by lowering n1The gradient of the stitching intervals can be reduced, and the stitching intervals are distributed more continuously; such as increasing x, increases the fabric size.
(2) And (3) printing 1: 1, sewing position diagram. The paper surface density for printing stitch position was 50g/m2～60g/m2White with a thickness less than or equal to 0.05 mm.
(3) The fiber cloth is selected to be layered, and the number of layers can be determined according to the thickness of the single-layer fiber cloth and the volume of the molding cavity. And (3) enveloping the sewing position graph printed in the step (2) by the size of the fiber cloth.
The fiber cloth can be carbon cloth, silicon carbide, glass fiber cloth or other common fiber cloth of ceramic matrix composite materials.
(4) And (4) layering the fiber cloth blanked in the step (3) to form a semi-formed fabric. And (3) after the layering is finished, fixing the drawing processed in the step (2) on the surface of the semi-formed fabric to form the semi-formed fabric with the sewing position mark.
(5) And sewing the semi-formed fabric with the sewing position mark, and sewing along the sewing mark to obtain the two-dimensional ply-sewing structure fabric with the sewing space distributed in a gradient manner.
The fabric to be sewn can be a fabric formed by laying two-dimensional fiber cloth, and also can be a needle punched fabric or other fabrics to be sewn.
The suture can adopt carbon fiber T300-1K or 3K, silicon carbide fiber or other ceramic fiber.
The sewing thread is single-strand or double-strand fiber by adopting a manual sewing mode, and the sewing is carried out along a weft sewing thread and a sewing point marked in a drawing during sewing.
According to the ceramic matrix composite development process, the paper on the surface of the stitched fabric can be removed at the subsequent fabric heat treatment stage.
Example 1
(1) According to the suture interval (4 mm-20 mm) to be considered, designing a suture position graph with gradient distribution:
(a) an isosceles triangle is designed, a midline is established, the bottom edge of the triangle is divided into 20 line segments with equal length, the length of each line segment is 4mm, and the total length of the first latitudinal suture is 80 mm. Starting from the vertex, rays are drawn at the 20 segment endpoints on the first stitch (warp stitch).
(b) And a line segment parallel to the first weft sewing line is made outside the first weft sewing line, and the end points of the line segment are on the extension lines of two sides of the isosceles triangle, so that the second weft sewing line is called as the second weft sewing line. The second weft stitching thread was specified to be 4mm from the first weft stitching thread. The height of the first weft stitching thread from the vertex is set to be 40 mm. The size of 20 line segments divided by the radial sewing thread in the step (1) (a) in the second weft sewing thread is the sewing distance on the weft sewing thread
Figure BDA0002743620570000061
(b) The distance between the ith suture and the (i-1) th suture is defined as ni-1. Inner suture spacing of ith weft suture
Figure BDA0002743620570000062
(wherein 1)<i is less than or equal to m), when i is 18, n18Envelope the requirement for maximum stitch spacing at 20.22 mm. The suture spacing within each suture in the middle is shown in the following table:
suture spacing n1 n2 n3 n4 n5 n6 n7 n8 n9
Actual value/mm 4.00 4.40 4.84 5.32 5.86 6.44 7.09 7.79 8.57
Suture spacing n10 n11 n12 n13 n14 n15 n16 n17 n18
Actual value/mm 9.43 10.37 11.41 12.55 13.81 15.19 16.71 18.38 20.22
The 18 th suture had a length of 20.22mm by 20-404.36 mm. The distance between the first suture and the 18 th suture is n1+n2+…+n17162.18 mm. As shown in fig. 4.
(2) According to the above parameters, a stitch position map is drawn in autoCAD software, and 1: 1 stitch layout, typepaper format: 60g/m2And the thickness is 0.05 mm. The upper portion containing the apex is then cut away along the first weft seam.
(3) Selecting T300-3K five-leaf satin carbon cloth, enveloping the sewing position graph printed in the step (2) according to the size of the carbon cloth, and cutting out 18 layers of carbon cloth.
(4) And (4) layering the fiber cloth blanked in the step (3) to form a semi-formed fabric. And (3) after the layering is finished, fixing the drawing processed in the step (2) on the surface of the semi-formed fabric.
(5) And (4) sewing the fabric by adopting a double-strand T300-3K carbon fiber and manual sewing mode, wherein the sewing is carried out along a weft sewing line and the sewing points marked in the step (4). Thus obtaining the two-dimensional ply-stitch structure fabric with the stitch density in gradient distribution.
The method can obtain n1～n18The total number of the typical sewing interval structure parameters is 18, and the number of the input test pieces is reduced by 94 percent compared with that of the test pieces which only adopt one sewing structure parameter on the same flat plate.
Example 2
(1) Designing a suture position graph with gradient distribution according to the suture interval (3 mm-12.5 mm) to be inspected:
(a) an isosceles triangle is designed, a midline is established, the bottom edge of the triangle is divided into 40 line segments with equal length, the length of each line segment is 3mm, and the total length of the first latitudinal suture is 120 mm. Starting from the vertex, the rays are drawn at the 40 segment end points on the first stitch (warp stitch).
(b) And a line segment parallel to the first weft sewing line is made outside the first weft sewing line, and the end points of the line segment are on the extension lines of two sides of the isosceles triangle, so that the second weft sewing line is called as the second weft sewing line. The second weft stitching thread was specified to be 3mm from the first weft stitching thread. The height of the first weft stitching thread from the apex was set to 50 mm. The size of 40 line segments divided by the radial sewing thread in the step (1) (a) in the second weft sewing thread is the sewing distance on the weft sewing thread
Figure BDA0002743620570000071
(b) The distance between the ith suture and the (i-1) th suture is defined as ni-1. Inner suture spacing of ith weft suture
Figure BDA0002743620570000072
(wherein 1)<i is less than or equal to m), when i is 25, n25Envelope the requirement for maximum stitch spacing at 12.15 mm. The suture spacing within each suture in the middle is shown in the following table:
suture spacing n1 n2 n3 n4 n5 n6 n7 n8 n9
Actual value/mm 3.00 3.18 3.37 3.57 3.79 4.01 4.26 4.51 4.78
Suture spacing n10 n11 n12 n13 n14 n15 n16 n17 n18
Actual value/mm 5.07 5.37 5.69 6.04 6.40 6.78 7.19 7.62 8.08
Suture spacing n19 n20 n21 n22 n23 n24 n25 n26 /
Actual value/mm 8.56 9.08 9.62 10.20 10.81 11.46 12.15 12.88 /
The 26 th suture had a length of 12.88mm by 40 ≈ 515 mm. The distance between the first suture and the 18 th suture is n1+n2+…+n25165 mm. As shown in fig. 5 and 6.
(2) Based on the above parameters, a stitch position map was drawn by drawing software such as autoCAD, and 1: 1 stitch layout, typepaper format: 50g/m2And the thickness is 0.04 mm. The upper portion containing the apex is then cut away along the first weft seam.
(3) And (3) selecting and cutting the needle-punched fabric to be sewn, wherein the size of the fabric needs to be covered by the sewing position graph printed in the step (2).
(4) And (3) fixing the drawing processed in the step (2) on the surface of the needle-punched fabric.
(5) And (4) sewing the fabric by adopting a double-strand T300-3K carbon fiber and manual sewing mode, wherein the sewing is carried out along a weft sewing line and the sewing points marked in the step (4). Thus obtaining the needle-punched and sewed fabric with the sewing density in gradient distribution.
The method can obtain n1～n26The total number of 26 typical sewing interval structure parameters is reduced by 96 percent compared with the condition that only one sewing structure parameter is adopted by the same flat plate.

Claims (10)

1. A high-flux preparation method of gradient sewing density fabric for ceramic matrix composite is characterized by comprising the following steps:
(1) according to the sewing interval range n to be inspecteda～nbDesigning a suture position map with gradient distribution, wherein na＜nb；
(2) And (3) printing 1: 1 sewing position diagram;
(3) selecting fiber cloth subjected to layering, wherein the number of layers is determined according to the thickness of single-layer fiber cloth and the volume of a forming cavity, and the size of the fiber cloth needs to be wrapped by the sewing position graph printed in the step (2);
(4) laying the fiber cloth blanked in the step (3) to form a semi-formed fabric, and fixing the sewing position diagram printed in the step (2) on the surface of the semi-formed fabric after laying to form the semi-formed fabric with the sewing position mark;
(5) and sewing the semi-formed fabric with the sewing position mark, and sewing along the sewing mark to obtain the two-dimensional ply-sewing structure fabric with the sewing space distributed in a gradient manner.
2. The high-throughput manufacturing method of the gradient stitched density fabric for ceramic matrix composite according to claim 1, wherein: the step (1) of designing a suture position map with gradient distribution specifically comprises the following steps:
(a) designing an isosceles triangle, establishing a central line, dividing the bottom edge of the triangle into x line segments with equal length, wherein the length of each line segment is n1，n1≤naThe total length of the first weft-wise sewing thread is x.n1(ii) a Starting from the vertex, drawing a ray of x line segment endpoints on the first weft stitching line, wherein the ray is called a warp stitching line;
(b) a line segment parallel to the first latitudinal suture line is made outside the first latitudinal suture line, and the end points of the line segment are on the extension lines of two sides of the isosceles triangle, so that the line segment is called as a second latitudinal suture line; the distance between the second weft sewing thread and the first weft sewing thread is n1；
Assuming that the first weft stitching thread has a height L from the vertex0The x line segment size divided by the radial sewing line in the step (a) in the second weft sewing line is the sewing distance on the weft sewing line
Figure FDA0002743620560000021
(c) Similarly, a third weft sewing thread is made, and the distance between the third weft sewing thread and the second weft sewing thread is n2And the internal suture spacing of the third weft suture
Figure FDA0002743620560000022
(d) And the like, making the ith latitudinal suture line, wherein the distance between the ith suture line and the (i-1) th suture line is ni-1Inner stitch spacing of i-th weft stitch line
Figure FDA0002743620560000023
Wherein 1 is<i≤m；
(e) The inner sewing distance n of the mth sewing threadmMaximum stitching spacing n enveloping the required studybExtending each warp suture line to form a suture position distribution diagram of the warp suture lines and the weft suture lines which are staggered and distributed in a gradient grid manner; finally, along the first weft stitching line, the portion of the upper portion containing the apex is cut away.
3. The high-throughput manufacturing method of the gradient stitched density fabric for ceramic matrix composite according to claim 1, wherein: in the step (2), the density of the paper surface for printing the stitch position is 50g/m2～60g/m2White with a thickness less than or equal to 0.05 mm.
4. The high-throughput manufacturing method of the gradient stitched density fabric for ceramic matrix composite according to claim 1, wherein: in the step (3), the fiber cloth is carbon cloth, silicon carbide, glass fiber cloth or other ceramic matrix composite material fiber cloth.
5. The high-throughput manufacturing method of the gradient stitched density fabric for ceramic matrix composite according to claim 1, wherein: the fabric needing to be sewn is formed by laying two-dimensional fiber cloth or needling the fabric.
6. The high-throughput manufacturing method of the gradient stitched density fabric for ceramic matrix composite according to claim 1, wherein: when the suture is performed in the step (5), the adopted suture is carbon fiber T300-1K or 3K, silicon carbide fiber or other ceramic fiber.
7. The method for high-throughput preparation of a gradient stitched density fabric for ceramic matrix composites according to claim 6, wherein: and (5) when the suture is performed in the step (5), a manual suture mode is adopted.
8. The method for high-throughput preparation of a gradient stitched density fabric for ceramic matrix composites according to claim 6, wherein: when the suture is performed, the suture line is single-stranded or double-stranded.
9. The method for high-throughput preparation of a gradient stitched density fabric for ceramic matrix composites according to claim 6, wherein: when sewing, sewing is carried out along the latitudinal sewing lines and the sewing points marked in the drawing.
10. The method for high-throughput preparation of a gradient stitched density fabric for ceramic matrix composites according to claim 6, wherein: the paper on the surface of the seamed fabric is removed during the subsequent heat treatment stage of the fabric.
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CN104589724A (en) * 2014-12-24 2015-05-06 中国建筑材料科学研究总院 Stitched laminar flexible heat insulation material and preparation method thereof
CN109517388A (en) * 2018-11-22 2019-03-26 航天特种材料及工艺技术研究所 A kind of high temperature resistant toughness sealing material and preparation method thereof
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JPH11121015A (en) * 1997-10-08 1999-04-30 Hokuriku Esuteaaru Kyodo Kumiai High density energy absorbing/releasing material for secondary battery
CN103922776A (en) * 2014-04-01 2014-07-16 中国人民解放军国防科学技术大学 Silicon carbide fibre-reinforced silicon carbide composite microwave-absorbing ceramic and preparation method thereof
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