Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing hfc-sic modified c/c composite material by high temperature-dipping cracking process

A composite material, dipping and cracking technology, applied in the field of C/C composite material preparation, can solve the problems affecting the preparation efficiency of materials, uneven distribution of ceramics, crusting on the surface of materials, etc. The effect of efficiency

Active Publication Date: 2020-04-03
NORTHWESTERN POLYTECHNICAL UNIV
View PDF8 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing hfc-sic modified c/c composite material by high temperature-dipping cracking process
  • Method for preparing hfc-sic modified c/c composite material by high temperature-dipping cracking process
  • Method for preparing hfc-sic modified c/c composite material by high temperature-dipping cracking process

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com