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A Fiber Arrangement Method for Improving the Mechanical Properties of Ceramic Matrix Composites for Engine Hot End Components

A composite material and fiber arrangement technology, which is applied in the field of fiber arrangement methods to improve the mechanical properties of ceramic matrix composite materials for engine hot end components, can solve the problems of cracking, deformation, low transverse mechanical properties, etc., and achieves increased transverse mechanical properties. performance, the effect of improving mechanical properties

Active Publication Date: 2017-12-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The longitudinal tensile strength of the ceramic matrix composite SiCf\SiC is much greater than the transverse tensile strength, but since the ceramic matrix composite SiCf\SiC will be subjected to a load that deviates from the longitudinal direction during use, if the transverse mechanical properties of the composite are too low , it will lead to transverse deformation or even cracking of the composite material before the longitudinal failure reaches the target.
[0003] In the past, ceramic matrix composite materials SiCf\SiC used fiber arrangements such as square arrangement and hexagonal arrangement. These fiber arrangement methods have certain limitations in improving the mechanical properties of ceramic matrix composite materials SiCf\SiC. The mechanical properties cannot achieve the desired effect, as shown in the table below

Method used

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  • A Fiber Arrangement Method for Improving the Mechanical Properties of Ceramic Matrix Composites for Engine Hot End Components
  • A Fiber Arrangement Method for Improving the Mechanical Properties of Ceramic Matrix Composites for Engine Hot End Components
  • A Fiber Arrangement Method for Improving the Mechanical Properties of Ceramic Matrix Composites for Engine Hot End Components

Examples

Experimental program
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Effect test

Embodiment 1

[0034] figure 1 A schematic diagram of a two-dimensional cross-section of a fiber structural unit provided by the present invention; as figure 1 As shown, the fiber structure unit includes: a total of 4 layers from top to bottom, with a total of 10 fibers; among them, a total of 5 fibers in the upper 2 layers, arranged in an equilateral triangle; a total of 6 fibers in the middle 2 layers, arranged in a square; the lower 2 layers A total of 5 fibers are arranged in an inverted triangle.

[0035] where the triangles are arranged as figure 2 As shown, 3 fibers surround to form a triangle.

[0036] Quartet arranged as image 3 As shown, 4 fibers surround to form a rectangle.

[0037] Wherein, the side length of the triangle formed by the 3 fibers arranged in a triangle is larger than the diameter of the fiber.

[0038] The side length of the rectangle formed by four fibers arranged in a square is larger than the fiber diameter.

Embodiment 2

[0040] Figure 4 A schematic diagram of a two-dimensional cross-section of another fiber structural unit provided by the present invention;

[0041] The fiber structure unit includes: a total of 4 layers from top to bottom, a total of 10 fibers; wherein, a total of 5 fibers in the upper 2 layers are arranged in an equilateral triangle; a total of 6 fibers in the middle 2 layers are arranged in a square; A total of 5 fibers in the layer are arranged in an inverted equilateral triangle. Of course, in addition to equilateral triangles, the arrangement of isosceles triangles is also possible; the normal stress in the X direction of the arrangement of equilateral triangles is lower than that of the arrangement of isosceles triangles. (The normal stress in the X direction will be explained in detail later)

[0042] Wherein, the side length of the triangle formed by the three fibers arranged in a triangle is equal to the diameter of the fiber.

[0043] The side length of the recta...

Embodiment 3

[0048] like Figure 5 Shown is an embodiment of the ceramic matrix composite material for the engine hot end component formed by repeating the transverse arrangement of the fiber structural units in the first embodiment.

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Abstract

The invention relates to a fiber distribution manner for improving the mechanical property of a ceramic matrix composite used for a component of a hot end of an engine. The ceramic matrix composite used for the component of the hot end of the engine comprises a plurality of fiber structure units arrayed in a repeated manner in a space, wherein each of the fiber structure units comprises four layers of ten fibers from top to bottom; five fibers in the upper two layers are arrayed in a regular triangle shape; six fibers in the middle two layers are arrayed in a square shape; five fibers in the lower two layers are arrayed in an inverted triangle shape. With adoption of the fiber distribution manner provided by the invention, the transverse mechanical property of the ceramic matrix composite can be enhanced to a certain degree, thereby avoiding transverse deformation and even cracking of the composite before the longitudinal failure of the composite does not reach an index as the transverse mechanical property of the composite is too low, and comprehensively improving the mechanical property of the ceramic matrix composite.

Description

technical field [0001] The invention relates to the technical field of mechanical performance testing of composite materials, in particular to a fiber arrangement method for improving the mechanical performance of ceramic matrix composite materials used in engine hot end components. Background technique [0002] Due to the large difference in thermal expansion coefficient between SiC fiber and SiC matrix, when the ceramic matrix composite material SiCf\SiC is prepared and heat-treated, thermal residual stress will be generated in the composite material, and the thermal residual stress in different directions in different parts will affect the Composite materials produce different effects. The longitudinal tensile strength of the ceramic matrix composite SiCf\SiC is much greater than the transverse tensile strength, but since the ceramic matrix composite SiCf\SiC will be subjected to a load that deviates from the longitudinal direction during use, if the transverse mechanical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B5/12
CPCC04B2235/5256C04B2235/5244
Inventor 罗瑞盈商海东邓楚燕
Owner BEIHANG UNIV