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Method for preparing HfC-SiC modified C/C composite with high-temperature infiltration-pyrolysis process

A composite material, impregnation cracking technology, applied in the field of C/C composite material preparation, can solve the problems that affect the preparation efficiency of materials, uneven distribution of ceramics, crusting on the surface of materials, etc., to shorten the preparation cycle, uniform and dense distribution, and improve preparation efficiency effect

Active Publication Date: 2017-05-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has many disadvantages. For example, the material preparation cycle is too long and generally takes more than several months, and the number of cycles of impregnation and heat treatment processes in the preparation process is too many, generally more than 20 cycles, which greatly affects the Material Preparation Efficiency
If the concentration of the precursor solution is too high during the impregnation process, it will also cause problems such as crusting on the surface of the material and uneven distribution of ceramics.

Method used

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  • Method for preparing HfC-SiC modified C/C composite with high-temperature infiltration-pyrolysis process
  • Method for preparing HfC-SiC modified C/C composite with high-temperature infiltration-pyrolysis process
  • Method for preparing HfC-SiC modified C/C composite with high-temperature infiltration-pyrolysis process

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This example is a preparation method of HfC-SiC modified C / C composite material.

[0033]Step 1: carbon felt cleaning: the density is 0.45g / cm 3 Put the carbon felt in absolute ethanol for ultrasonic cleaning for 15 minutes, and then dry it in an oven with a drying temperature of 70°C for later use;

[0034] Step 2: Prepare porous low-density C / C preform: place the cleaned carbon felt in an isothermal chemical vapor deposition furnace, use natural gas as the reaction gas source, and the gas flow rate is 0.5m 3 / h, the deposition temperature is 950°C, and the deposition time is 50h. After the end, it is cooled with the furnace to obtain a porous low-density C / C preform;

[0035] Step 3: Preform cleaning: The porous low-density C / C preform obtained after deposition was ultrasonically cleaned in absolute ethanol for 15 minutes, and then dried in an oven at a drying temperature of 70°C for later use;

[0036] Step 4: Introduction of HfC-SiC ceramic phase: the specific pro...

Embodiment 2

[0042] Step 1: carbon felt cleaning: the density is 0.47g / cm 3 Put the carbon felt in absolute ethanol for ultrasonic cleaning for 20 minutes, and then dry it in an oven with a drying temperature of 75°C for later use;

[0043] Step 2: Prepare porous low-density C / C preform: place the cleaned carbon felt in an isothermal chemical vapor deposition furnace, use natural gas as the reaction gas source, and the gas flow rate is 0.6m 3 / h,N 2 As a carrier gas, the deposition temperature is 1050°C, and the deposition time is 45 hours. After the end, it is cooled with the furnace to obtain a porous low-density C / C preform;

[0044] Step 3: Cleaning of the prefabricated body: The porous low-density C / C prefabricated body prepared after deposition was ultrasonically cleaned in absolute ethanol for 20 minutes, and then dried in an oven at a drying temperature of 75°C for later use;

[0045] Step 4: Introduction of HfC-SiC ceramic phase: the specific process is:

[0046] 1) Preparation...

Embodiment 3

[0051] Step 1: carbon felt cleaning: the density is 0.46g / cm 3 Put the carbon felt in absolute ethanol for ultrasonic cleaning for 10 minutes, and then dry it in an oven with a drying temperature of 65°C for later use;

[0052] Step 2: Prepare porous low-density C / C preform: place the cleaned carbon felt in an isothermal chemical vapor deposition furnace, use natural gas as the reaction gas source, and the gas flow rate is 0.7m 3 / h, the deposition temperature is 1100°C, and the deposition time is 40h. After the end, it is cooled with the furnace to obtain a porous low-density C / C preform;

[0053] Step 3: Cleaning of the prefabricated body: The porous low-density C / C prefabricated body prepared after deposition was ultrasonically cleaned in absolute ethanol for 10 minutes, and then dried in an oven at a drying temperature of 65°C for later use;

[0054] Step 4: Introduction of HfC-SiC ceramic phase: the specific process is:

[0055] 1) Preparation of precursor mixed solutio...

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Abstract

The invention relates to a method for preparing an HfC-SiC modified C / C composite with a high-temperature infiltration-pyrolysis process. The method comprises the following steps: a carbon felt is cleaned and dried, and a low-density porous preform is prepared through isothermal chemical vapor deposition; an HfC precursor and polycarbosilane mixed solution is prepared to be taken as a precursor of an HfC-SiC ceramic phase, subjected to vacuum infiltration in an environment at about 110 DEG C and infiltrated into the preform, pyrolysis is performed, the high-temperature infiltration-pyrolysis process is repeated until the material gets densified, and the HfC-SiC modified C / C composite is prepared. The method has the beneficial effects as follows: based on the characteristic that the viscosity of the high-concentration polycarbosilane and HfC precursor mixed solution decreases with increasing temperature, the precursor mixed solution with high concentration is infiltrated into the porous C / C preform when the temperature is 90-110 DEG C, so that the porous C / C preform is filled fully faster, ceramic is uniformly and densely distributed in the preform, the final density reaches 2.4-2.7 g / cm<3>, the material preparing period is shortened, and the material preparing efficiency and the distribution uniformity of the ceramic phase in the material are improved.

Description

technical field [0001] The invention relates to the field of C / C composite material preparation. In particular, it relates to a method for preparing HfC-SiC modified C / C composite material by adopting a high temperature-dipping cracking process. Background technique [0002] With the rapid development of the aerospace industry, higher and higher requirements are put forward for the performance of ultra-high temperature materials, such as the emergence of a new generation of ultra-high temperature, high pressure, high speed, and lightweight solid rocket motors, making the throat lining materials need to withstand the temperature Up to 3300-3700 degrees Celsius, which puts forward higher performance requirements for throat lining materials. Carbon / carbon (C / C) composites are proven to be the most ideal nozzle throat lining materials. Therefore, it is particularly important to solve the problem of high temperature resistance of C / C composites. Ultra-high temperature ceramics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/84
CPCC04B35/83C04B2235/3826C04B2235/3839C04B2235/77
Inventor 李贺军张豫丹张雨雷李克智姚西媛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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