Method for preparing nanowire-toughened carbon/carbon composite material ceramic coating

A carbon composite material and nanowire toughening technology, which is applied in the field of preparation of carbon/carbon composite ceramic coatings, can solve problems such as poor compactness of ceramic coatings, and achieve the effect of reducing the tendency of cracking

Active Publication Date: 2012-07-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of poor compactness of ceramic coatings prepared by existing methods, the invention provides a method for preparing nanowire toughened C / C composite ceramic coatings

Method used

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  • Method for preparing nanowire-toughened carbon/carbon composite material ceramic coating
  • Method for preparing nanowire-toughened carbon/carbon composite material ceramic coating
  • Method for preparing nanowire-toughened carbon/carbon composite material ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The C / C composite material was sequentially polished and polished with No. 400, No. 800 and No. 1000 sandpaper respectively, washed with absolute ethanol, and dried in an oven for later use.

[0020] Weigh 10g of Si powder, 25g of C powder and 65g of SiO 2 pink. Place in a turpentine ball mill jar, take different numbers of agate balls with different diameters into the rosin ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 2 hours, and use it as a powder for later use.

[0021] Put the powder into the graphite crucible so that the thickness of the powder is one-fifth of the depth of the graphite crucible, then bind the dried C / C composite material with a bunch of 3K carbon fibers and hang it above the surface of the powder , and then put the graphite crucible into the vacuum reactor. After evacuating for 30 minutes, make the vacuum degree reach -0.09MPa, keep the vacuum for 30 minutes, and observe whether the indicat...

Embodiment 2

[0025] Example 2: The C / C composite material was sequentially polished and polished with No. 400, No. 800 and No. 1000 sandpaper respectively, washed with absolute ethanol, and dried in an oven for later use.

[0026] Weigh 15g of Si powder, 30g of C powder and 75g of SiO 2 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and different diameters into the rosin ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 3 hours, and use it as a powder for later use.

[0027] Put the powder into the graphite crucible so that the thickness of the powder is one-fifth of the depth of the graphite crucible, then bind the baked C / C composite material with a bundle of 3K carbon fibers and hang it above the surface of the powder, Then put the graphite crucible into the vacuum reactor. After evacuating for 30 minutes, make the vacuum degree reach -0.09MPa, keep the vacuum for 30 minutes, and observe whether the indication of...

Embodiment 3

[0031] Example 3: The C / C composite material was sequentially polished and polished with No. 400, No. 800 and No. 1000 sandpaper respectively, washed with absolute ethanol, and dried in an oven for later use.

[0032] Weigh 20g of Si powder, 15g of C powder and 55g of SiO 2 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and different diameters into the turpentine ball mill jar, and carry out ball milling and mixing treatment on a planetary ball mill for 4 hours, and use it as a powder for later use.

[0033] Put the powder into the graphite crucible so that the thickness of the powder is one-fifth of the depth of the graphite crucible, then bind the baked C / C composite material with a bundle of 3K carbon fibers and hang it above the surface of the powder, Then put the graphite crucible into the vacuum reactor. After evacuating for 30 minutes, make the vacuum degree reach -0.09MPa, keep the vacuum for 30 minutes, and observe whether the indica...

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Abstract

The invention discloses a method for preparing a nanowire-toughened carbon / carbon composite material ceramic coating. The method aims to solve the technical problem that the ceramic coating prepared by a conventional method has poor denseness. The method adopts the following technical scheme that: the nanowire-toughened carborundum (SiC)-molybdenum disilicide (MoSi2)-chromium silicide (CrSi2) ceramic coating is prepared by chemical vapor deposition, the cracking trend of the coating is reduced, and the ceramic coating with a dense structure is prepared by means of the toughening effect of nanowires. The effective anti-oxidization time of the prepared ceramic coating in atmosphere at the temperature of 1,500 DEG C is improved to 140 and 155 hours from 50 hours in background technology.

Description

technical field [0001] The invention relates to a preparation method of a carbon / carbon composite material ceramic coating, in particular to a preparation method of a nanowire toughened carbon / carbon composite material (hereinafter referred to as C / C composite material) ceramic coating. Background technique [0002] Oxidation at high temperature is the most difficult bottleneck in the practical application of thermal structural C / C composites. Researchers at home and abroad have proposed many solutions, and preparing an anti-oxidation coating on its surface is an effective means. Among them, ceramics The coating has good oxidation resistance and good physical and chemical compatibility with C / C composite materials, so it is an ideal coating material for C / C composite materials. However, the brittleness of ceramic coatings is the most difficult bottleneck in its practical application. The main reason for the anti-oxidation failure of the existing ceramic coating system is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
Inventor 付前刚褚衍辉李贺军李克智郭领军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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