Preparation method of HfC-SiC modified carbon/carbon composite material

A carbon composite material and modification technology, applied in the field of preparation of HfC-SiC modified carbon/carbon composite material, can solve the problems of carbon fiber damage, weak bonding strength, serious carbon fiber damage, etc., and improve wettability. , improve the density, improve the effect of anti-ablation performance

Inactive Publication Date: 2014-07-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, because the precursor is directly added to the carbon fiber prefabricated body, the carbon fiber is seriously damaged during the heat treatment process, and at the same time, due to the poor wettability of HfC and the matrix, the pyrolytic carbon peels off seriously during the ablation process.
[0005] In the process of preparing HfC modified carbon/carbon composite materials in the prior art, the introduction of HfC is mainly to soak the carbon fiber prefabricated body directly in the metal salt solution containing Hf. This k

Method used

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  • Preparation method of HfC-SiC modified carbon/carbon composite material
  • Preparation method of HfC-SiC modified carbon/carbon composite material
  • Preparation method of HfC-SiC modified carbon/carbon composite material

Examples

Experimental program
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Example Embodiment

[0021] Example one.

[0022] This embodiment is a method for preparing a modified carbon / carbon composite material mixed with HfC-SiC.

[0023] Step 1. Cleaning the carbon fiber preform. After cleaning the carbon fiber preform with absolute ethanol for 10 minutes, it is placed in an oven and dried for later use. The drying temperature is 60°C.

[0024] Step 2. Preparation of porous carbon / carbon composite material. The carbon fiber preform was placed in a thermal gradient chemical vapor deposition furnace with natural gas as the precursor, the deposition temperature was 900°C, and the deposition time was 3 hours. After the deposition is completed, graphitization is performed at 2300°C to obtain a porous carbon / carbon composite material.

[0025] Step 3. Introduction of HfC and SiC. The specific process is:

[0026] 1) Weigh hafnium tetrachloride, hydrofluoric acid and furan resin according to the mass ratio of 5:1:4. First, the hafnium tetrachloride and hydrofluoric acid are mixed ...

Example Embodiment

[0031] Example two.

[0032] Step 1. Cleaning the carbon fiber preform. After cleaning the carbon fiber preform with absolute ethanol for 20 minutes, it is placed in an oven and dried for later use. The drying temperature is 75°C.

[0033] Step 2. Preparation of porous carbon / carbon composite material. The carbon fiber preform was placed in a thermal gradient chemical vapor deposition furnace with natural gas as the precursor, the deposition temperature was 1050°C, and the deposition time was 4.5 hours. After the deposition, graphitization treatment at 2400°C is performed to obtain a porous carbon / carbon composite material.

[0034] Step 3. Introduction of HfC and SiC. The specific process is:

[0035] 1) Weigh hafnium tetrachloride, hydrofluoric acid and furan resin according to the mass ratio of 5:1:4. First, the hafnium tetrachloride and hydrofluoric acid are mixed to prepare an acidic solution containing hafnium. In this example, tetrachloride The hafnium powder was 20 g, the...

Example Embodiment

[0045] Example three.

[0046] Step 1. Cleaning the carbon fiber preform. After cleaning the carbon fiber preform with absolute ethanol for 30 minutes, it is placed in an oven and dried for later use. The drying temperature is 85°C.

[0047] Step 2. Preparation of porous carbon / carbon composite material. The carbon fiber preform was placed in a thermal gradient chemical vapor deposition furnace, with natural gas as the precursor, the deposition temperature was 1200°C, and the deposition time was 6 hours. After the deposition is completed, graphitization is performed at 2500°C to obtain a porous carbon / carbon composite material.

[0048] Step 3. Introduction of HfC and SiC. The specific process is:

[0049] 1) Weigh hafnium tetrachloride, hydrofluoric acid and furan resin according to the mass ratio of 5:1:4. First, the hafnium tetrachloride and hydrofluoric acid are mixed to prepare an acidic solution containing hafnium. In this example, tetrachloride The hafnium powder is 25 g, ...

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Abstract

The invention discloses a preparation method of an HfC-SiC modified carbon/carbon composite material and can be used for solving the technical problem that a composite material prepared by adopting the existing carbon/carbon composite material preparation method has poor mechanical properties. According to the technical scheme, an organic precursor solution containing hafnium and silicon is utilized, a porous carbon/carbon composite material is impregnated under the vacuum condition at normal temperature, then heat treatment is carried out at a high temperature, a series of chemical reactions are carried out, so that a carbon/carbon composite material containing HfC and SiC is obtained, and finally a high density HfC-SiC modified carbon/carbon composite material is obtained after cyclic impregnation and heat treatment is carried out. The preparation method of the HfC-SiC modified carbon/carbon composite material has the advantages that the porous carbon/carbon composite material is prepared by adopting a thermal gradient chemical vapour deposition method, and a thermolysis carbon layer is formed on carbon fibers, so that the carbon fibers are protected and can not be damaged; and a polycarbosilane precursor liquid phase impregnation pyrolysis method is adopted, SiC can be doped into a material, wettability between HfC ceramic and a matrix is improved, density is increased, and erosion resistance of the composite material is further improved.

Description

technical field [0001] The invention relates to a preparation method of carbon / carbon composite material, in particular to a preparation method of HfC-SiC modified carbon / carbon composite material. Background technique [0002] Carbon / carbon composite materials have a series of advantages such as low density, high specific strength, high modulus and low thermal expansion coefficient. They are widely used in aerospace high-temperature components. They have the ability to resist erosion, high temperature and oxidation, and can reduce the weight of components. With the rapid development of new aircraft, the requirements for solid rocket motors are more stringent, and the ablation resistance of carbon / carbon composites needs to be further improved. Relevant studies have shown that introducing refractory metal carbide HfC into carbon / carbon composites can Improving its anti-ablation performance, while introducing SiC can improve the wettability of HfC and the substrate, and furth...

Claims

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Application Information

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IPC IPC(8): C04B41/87
Inventor 李克智倪畅李贺军付前刚郭领军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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