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Preparing method of SiC-ZrC gradient modified carbon/carbon composite material

A technology of carbon composite materials and modified carbon, which is applied in the field of composite materials, can solve problems such as poor mechanical properties, and achieve the effects of improving interface bonding, avoiding agglomeration, and large voids

Active Publication Date: 2016-10-26
无锡博智复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings of poor mechanical properties of SiC-ZrC modified carbon / carbon composite materials prepared by existing methods, the present invention provides a preparation method of SiC-ZrC gradient modified carbon / carbon composite materials

Method used

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  • Preparing method of SiC-ZrC gradient modified carbon/carbon composite material
  • Preparing method of SiC-ZrC gradient modified carbon/carbon composite material
  • Preparing method of SiC-ZrC gradient modified carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Set the density to 0.40g / cm 3 The carbon fiber prefabricated body was placed in an isothermal chemical vapor deposition furnace to deposit a pyrolytic carbon layer, using natural gas as a carbon source, the deposition temperature was 1050 ° C, and the deposition time was 3 h. After the deposition was completed, it was cooled to room temperature and taken out, cleaned with ethanol ultrasonically for 20 min, and Dry at 70°C to form a pyrolytic carbon protective layer on the surface of the carbon fiber;

[0026] Step 2: SiO 2 The introduction of the specific process is:

[0027] a. Mix tetraethyl orthosilicate, ethanol, and deionized water at a molar ratio of 1:4:2, adjust the pH of the mixture to 3 with concentrated hydrochloric acid, and place the adjusted pH solution in a constant temperature water bath at 60°C Stir for 20h to get SiO 2 Sol;

[0028] b. Soak the carbon fiber preform containing pyrolytic carbon prepared in step 1 in silica sol and ultrasonica...

Embodiment 2

[0040] Step 1: Set the density to 0.43g / cm 3 The carbon fiber prefabricated body was placed in an isothermal chemical vapor deposition furnace to deposit a pyrolytic carbon layer, with natural gas as the carbon source, the deposition temperature was 1100 ° C, and the deposition time was 5 h. After the deposition was completed, it was cooled to room temperature and taken out, and cleaned with absolute ethanol for 40 min. Then place it in an 80°C drying oven to dry, and make a layer of pyrolytic carbon protective layer on the surface of the carbon fiber;

[0041] Step 2: SiO 2 The introduction of the specific process is:

[0042] a. Mix tetraethyl orthosilicate, ethanol, and deionized water at a molar ratio of 1:4:2, adjust the pH of the mixture to 3 with concentrated hydrochloric acid, and place the adjusted pH solution in a constant temperature water bath at 65°C Stir for 15h to get SiO 2 Sol;

[0043] b. Soak the carbon fiber preform containing pyrolytic carbon prepared i...

Embodiment 3

[0053] Step 1: Set the density to 0.45g / cm 3 The carbon fiber prefabricated body was placed in an isothermal chemical vapor deposition furnace to deposit a pyrolytic carbon layer, using natural gas as a carbon source, the deposition temperature was 1150°C, and the deposition time was 8 hours. After the deposition was completed, it was cooled to room temperature and taken out. Dry in a drying oven at 90°C to form a pyrolytic carbon protective layer on the surface of the carbon fiber;

[0054] Step 2: SiO 2 The introduction of the specific process is:

[0055] a. Mix tetraethyl orthosilicate, ethanol, and deionized water at a molar ratio of 1:4:2, adjust the pH of the mixture to 3 with concentrated hydrochloric acid, and place the adjusted pH solution in a 70°C constant temperature water bath Stir for 10h to get SiO 2 Sol;

[0056] b. Soak the carbon fiber preform containing pyrolytic carbon prepared in step 1 in silica sol and ultrasonically impregnate it for 6 hours, take ...

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Abstract

The invention discloses a preparing method of a SiC-ZrC gradient modified carbon / carbon composite material. The preparing method is used for solving the technical problem that a SiC-ZrC gradient modified carbon / carbon composite material prepared through an existing method is poor in mechanical property. According to the technical scheme, a SiO2 ceramic layer and a ZrO2 ceramic layer are sequentially prepared on the carbon fiber surfaces of carbon fiber preform through silica sol impregnation and a microwave hydrothermal method, two pyrolytic carbon layers are deposited between oxide and carbon fiber as well as between two oxides respectively through a CVI process, a pyrolytic carbon / SiO2 / pyrolytic carbon / ZrO2 structure is formed on the carbon fiber surface, oxide ceramics are reduced into carbide ceramics in situ through high-temperature thermal treatment, and the C / C-SiC-ZrC composite material with SiC and ZrC gradiently distributed around the carbon fiber is obtained through densification. As SiC and ZrC gradiently distributed around the carbon fiber improve interface combination between the carbon fiber and a base body, mechanical properties of the composite material are improved.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a preparation method of a SiC-ZrC gradient modified carbon / carbon composite material. Background technique [0002] Carbon / carbon composite materials have excellent properties such as high specific strength, high specific modulus, low density, high temperature resistance and ablation resistance, and have been widely used in missile warheads, high-speed aircraft nose cones, solid rocket motor nozzles and throat linings, etc. High-temperature structural parts are one of the most promising ultra-high-temperature materials at present. However, due to the disadvantage of easy oxidation of carbon materials, it is necessary to modify carbon / carbon composite materials. A large number of studies have shown that the oxidation and ablation resistance of carbon / carbon composites can be improved by modifying carbon / carbon composites with SiC-ZrC dual-phase ceramics. However, traditional m...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/622C04B35/83C04B2235/3817C04B2235/3826C04B2235/77C04B2235/96
Inventor 李克智石郭戈赵志刚王昌聪李贺军
Owner 无锡博智复合材料有限公司
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