Preparation method of carbon fiber reinforced carbon-silicon carbide double matrix composites

A composite material and silicon carbide double technology, which is applied in the field of composite materials, can solve the problems of limiting the use temperature of composite materials, insufficient fracture toughness, and damage to mechanical properties, and achieve good oxidation resistance, reduce cracks, and reduce brittleness.

Active Publication Date: 2020-09-15
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a carbon fiber reinforced carbon-silicon carbide double-matrix composite material, aiming to solve the problem that there are many residual silicon elements in the carbon fiber-reinforced carbon-silicon carbide double-matrix composite material in the prior art, which has a negative impact on the mechanical properties. damage, thus limiting the service temperature of composite materials, and the fracture toughness is not high enough

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  • Preparation method of carbon fiber reinforced carbon-silicon carbide double matrix composites

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specific Embodiment 1

[0030] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing a carbon fiber reinforced carbon-silicon carbide double-matrix composite material, including:

[0031] Step S101, using carbon fiber as a raw material to prepare a carbon fiber green body;

[0032] Step S102, using the carbon fiber green body as a raw material to prepare a carbon fiber reinforced carbon prefabricated body;

[0033] Step S103, graphitizing the carbon fiber reinforced carbon preform;

[0034] Step S104, using carbon fiber reinforced carbon prefabricated body, silicon powder, and molybdenum powder as raw materials to prepare carbon fiber reinforced carbon-silicon carbide double-matrix composite material.

[0035] The embodiment of the present invention introduces the molybdenum disilicide phase into the composite material matrix to reduce the residual silicon element and the brittleness of the composite material through the co-infiltration of silicon-molybd...

specific Embodiment 2

[0055] An embodiment of the present invention provides a method for preparing a carbon fiber reinforced carbon-silicon carbide double-matrix composite material, including:

[0056] Step 1, preparing a carbon fiber green body; the carbon fiber green body is a two-dimensional 0° / 90° laminate, or a three-dimensional acupuncture or three-dimensional weaving;

[0057] Step 2, prepare C / C composite material preform:

[0058] The prepared carbon fiber three-dimensional needle-punched braided body was loaded into a chemical vapor deposition furnace for deposition. The deposition temperature is 950-1050°C, the deposition gas is natural gas and propane, the flow rate of natural gas is 3.5-6.5L / min., the flow rate of propane is 0.2-0.5L / min., the furnace pressure is 1000Pa, and the deposition time is 10h-30h , the C / C composite material prefabricated body can be obtained;

[0059] Step 3, graphitization treatment:

[0060] Put the obtained C / C composite material into a high-temperatur...

specific Embodiment 3

[0072] An embodiment of the present invention provides a method for preparing a carbon fiber reinforced carbon-silicon carbide double-matrix composite material, the method comprising:

[0073] Step 1, weaving T700 carbon fiber into a two-dimensional 0° / 90° carbon fiber fabric laminate;

[0074] Step 2, prepare C / C composite material preform:

[0075] The prepared two-dimensional carbon fiber fabric stack was loaded into a chemical vapor deposition furnace for deposition. The deposition temperature is 1005°C, the deposition gas is natural gas and propane, the flow rate of natural gas is 4.0L / min., the flow rate of propane is 0.4L / min., the furnace pressure is 1000Pa, and the deposition time is 20h, the C / C can be obtained. Composite preforms;

[0076] Step 3, graphitization treatment:

[0077] Put the obtained C / C composite material into a high-temperature heat treatment furnace for graphitization treatment, the specific process is as follows:

[0078] Vacuumize the high te...

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Abstract

The invention provides a preparation method of a carbon fiber reinforced carbon-silicon carbide double-matrix composite material. According to the present invention, through silicon-molybdenum alloy infiltration, a molybdenum disilicide phase is introduced into a composite material matrix so as to reduce the residual silicon element and reduce the brittleness of the composite material; molybdenum disilicide has characteristics of moderate density, high melting point and good oxidation resistance, and can be converted from the brittleness to the plasticity within a certain temperature range, wherein molybdenum disilicide has a plastic deformation behavior and shows metal-like ductility when the temperature exceeds the temperature range so as to improve the fracture toughness of the composite material; molybdenum disilicide has a low thermal expansion coefficient and has good thermodynamic compatibility to silicon carbide so as to easily reduce the crack generation; and the process is simple, and the operation is easy.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing a carbon fiber reinforced carbon-silicon carbide double-matrix composite material. Background technique [0002] C / C-SiC composites refer to carbon fiber reinforced carbon and silicon carbide dual-matrix composites. It has a low density (2.0 ~ 2.5g / cm 3 ), high thermal shock resistance, long service life, high temperature resistance and oxidation resistance, as thermal structural materials are widely used in the aerospace field. [0003] The liquid silicon infiltration method refers to the impregnation treatment of porous C / C composite materials with molten silicon powder (Si) as an infiltration agent above the melting point of silicon at 1414 ° C, so that liquid Si can penetrate into the C / C composite materials under the action of capillary force. In the pores of the porous body, Si reacts exothermicly with matrix carbon to form SiC. The adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/52C04B35/622C04B35/65
CPCC04B35/52C04B35/565C04B35/622C04B35/65C04B35/806C04B2235/404C04B2235/428C04B2235/5248C04B2235/614C04B2235/96
Inventor 罗瑞盈张坤
Owner BEIHANG UNIV
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