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High-temperature composite material and preparation method thereof

A composite material and high-temperature technology, which is applied in the field of high-temperature composite materials and preparation, can solve the problems of selecting reinforcement fibers and insufficient performance improvement of high-temperature composite materials, and achieve excellent thermal conductivity and high-temperature corrosion resistance, and maintain a stable friction coefficient , the effect of improving the interlayer bonding force and bending strength

Active Publication Date: 2016-05-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current preparation methods of high-temperature composite materials do not disclose the selection of different reinforcement fibers and different densification processes according to different matrices, resulting in the inability to fully improve the performance of some high-temperature composite materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention is a kind of high-temperature composite material, the matrix is ​​double-matrix C-SiC, and the reinforcing body is a needle-punched felt structure prefabricated body formed by alternating layers of 0° no-weft cloth, fiber mesh tire, 90° no-weft cloth, and fiber mesh tire. The fiber mat and non-weft cloth are made of carbon fiber.

[0031] The preparation method of the high-temperature composite material comprises the following steps:

[0032] (1) Preparation of prefabricated body: Cut the carbon fiber into 50mm short-cut carbon fiber, and then after antistatic, mechanical loosening and softening treatment, feed it into the carding machine, form a web under the airflow of the carding machine, and make it after drying. Obtain the net tire, pave long carbon fiber into no-weft cloth; The layers of the net tire are needled in sequence, each layer is needled once, and each time the needle is needled, the needle needs to carry a certain length of fiber that matc...

Embodiment 2

[0040] The present invention is a kind of high-temperature composite material, the matrix is ​​a single matrix SiC, and the reinforcement is a needle-punched felt structure prefabricated body formed by alternate lamination of 0° no-weft cloth, fiber mesh tire, 90° no-weft cloth, and fiber mesh tire. Fiber mats and laid fabrics are made of SiC fibers.

[0041] The preparation method of the high-temperature composite material comprises the following steps:

[0042] (1) Preparation of prefabricated body: cut SiC fiber into 40mm chopped SiC fiber, and then after antistatic, mechanical loosening and softening treatment, feed it into carding machine, form a web under the action of airflow of carding machine, and make it after drying. Obtain the mesh tire, pave the long SiC fiber into a weft-free cloth; The layers of the net tire are needled in sequence, each layer is needled once, and each time the needle is needled, the needle needs to carry a certain length of fiber that matches ...

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Abstract

The invention relates to a high-temperature composite material and a preparation method thereof. The preparation method comprises the steps of preparation of a preform, heat treatment and densification, wherein the preform selects different fibers according to matrixes, a mono-base C selects carbon fiber or SiC fiber, a mono-base SiC selects the carbon fiber, the SiC fiber or Al 2O3 fiber, a double-base C-SiC selects the carbon fiber or the SiC fiber; the densification selects different densification processes according to the matrixes, specifically one or a combination of several kinds of a chemical vapor deposition (CVD) method and an impregnation and pyrolysis process. The preparation method provided by the invention not only improves the interlayer binding force and the bending strength of the material, but also improves a Z-direction heat conductivity coefficient and the shear strength, and the excellent mechanical property and high temperature resistance are achieved.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a high-temperature composite material and a preparation method. Background technique [0002] Composite materials are widely used in various fields due to their excellent performance, and with the continuous development of science and technology, such as aerospace, high-speed trains and other fields also put forward higher requirements for high-temperature structural materials, not only requiring higher performance at high temperatures Strength, wear resistance, corrosion resistance, stability, etc. In addition, the material is required to have the advantages of light weight, simple preparation process, and low cost. [0003] High-temperature composite materials are made of preforms made of high-temperature-resistant fibers as reinforcements, and are made by depositing carbon matrix on the surface and voids of the preforms through the densification process. Only when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/83
CPCC04B35/806C04B2235/5224C04B2235/5244C04B2235/5248C04B2235/5256C04B2235/526C04B2235/614C04B2235/616C04B2235/77
Inventor 罗瑞盈谢骏
Owner BEIHANG UNIV