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Preparation method of anti-oxidation coating on surface of C/C composite material

An anti-oxidation coating and composite material technology, applied in the field of protective materials, can solve the problems of unhealable coating cracks and pores, achieve excellent anti-oxidation performance, reduce the generation and spread of oxidative stress, and relieve thermal stress

Pending Publication Date: 2021-10-29
XI'AN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing an anti-oxidation coating on the surface of a C / C composite material, which solves the problem of defects such as cracks and pores in the coating that cannot be healed in the prior art

Method used

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  • Preparation method of anti-oxidation coating on surface of C/C composite material
  • Preparation method of anti-oxidation coating on surface of C/C composite material

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preparation example Construction

[0023] A preparation method for an anti-oxidation coating on the surface of a C / C composite material, comprising the following steps:

[0024] Step 1. Polish the C / C composite material with sandpaper, ultrasonically clean it with absolute ethanol for 20-40 minutes, and then dry it in an oven at 70-100°C for 0.5-1 hour.

[0025] Step 2, using an embedding method to embed a SiC coating on the surface of the C / C composite material to obtain a C / C composite material protected by the SiC coating;

[0026] Specifically, 65%-85% Si powder, 8%-16% C powder, 7%-19% Al 2 o 3 The powders are mixed and placed in a resin ball mill jar, and mixed for 2-4 hours to obtain embedding powders. Embed the C / C composite material into the embedding powder in the graphite crucible, place the graphite crucible in a high-temperature graphitization heat treatment furnace, use Ar as the protective gas, and raise the temperature to 1900-2100°C at 8-10°C / min , heat preservation for 1-2h, and naturally c...

Embodiment 1

[0031]Step 1. Polish the C / C composite material with sandpaper, ultrasonically clean it with absolute ethanol for 25 minutes, and then dry it in an oven at 80°C for 1 hour;

[0032] Step 2. Mix 70 g of Si powder, 15 g of C powder, and 10 g of SiC powder, put them in a resin ball mill jar, and mix for 3 hours to obtain embedding powder. Embed the C / C composite material into the embedding powder in the graphite crucible, place the graphite crucible in a high-temperature graphitization heat treatment furnace, use Ar as the protective gas, raise the temperature to 1900°C at 8°C / min, and keep it for 2h. Cool naturally to normal temperature to obtain C / C composite material protected by SiC coating;

[0033] Step 3, 80gZrSi 2 , 20g of SiC powder was mixed uniformly by planetary ball mill wet grinding method to obtain a mixed powder; 45g of mixed powder, 6g of binder, and 49g of distilled water were mixed and stirred for 2 hours to obtain a mixed slurry; the mixed slurry was granulat...

Embodiment 2

[0035] Step 1. Polish the C / C composite material with sandpaper, ultrasonically clean it with absolute ethanol for 35 minutes, and then dry it in an oven at 80°C for 1 hour;

[0036] Step 2. Mix 75g of Si powder, 12g of C powder, and 13g of SiC powder, put them in a resin ball mill jar, and mix for 3.5 hours to obtain embedding powder. Embed the C / C composite material into the embedding powder in the graphite crucible, place the graphite crucible in a high-temperature graphitization heat treatment furnace, use Ar as the protective gas, raise the temperature to 2000°C at 9°C / min, and keep it for 2h. Cool naturally to normal temperature to obtain C / C composite material protected by SiC coating;

[0037] Step 3, 70gZrSi 2 , 30g of SiC powder was uniformly mixed by planetary ball mill wet grinding method to obtain a mixed powder; 44g of mixed powder, 5g of binder, and 51g of distilled water were mixed and stirred for 2 hours to obtain a mixed slurry; the mixed slurry was granulat...

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Abstract

The invention discloses a preparation method of an anti-oxidation coating on the surface of a C / C composite material, which comprises the following steps: a SiC coating is embedded on the surface of the C / C composite material by adopting an embedding method to obtain a C / C composite material protected by the SiC coating; zrSi2-SiC powder is sprayed on the surface of the C / C composite material protected by the SiC coating, and the ZrSi2-SiC / SiC anti-oxidation coating is obtained on the surface of the C / C composite material. SiC in the outer coating and SiC in the inner coating are consistent in component, so that the difference value of thermal expansion coefficients of the inner coating and the outer coating can be effectively reduced, and generation of cracks caused by uneven thermal stress of the inner coating and the outer coating and even stripping of the outer coating are relieved; and the coating is a gradient coating system, the thermal expansion coefficient value is in gradient distribution from the inner coating to the outer coating, the thermal stress of the coating is effectively relieved, and the oxidation resistance of the coating system is improved.

Description

technical field [0001] The invention belongs to the technical field of protective materials and relates to a method for preparing an anti-oxidation coating on the surface of a C / C composite material. Background technique [0002] Due to its excellent high-temperature thermodynamic properties, C / C composites become one of the most ideal high-temperature thermal structural protection materials. However, the problem of easy oxidation in high-temperature aerobic environment limits its application, and the most effective method at present is to use external coating technology. The embedding method and the supersonic plasma spraying (SAPS) method are the main methods developed in recent years for the efficient preparation of coatings. The embedding method can obtain a coating with a controllable phase and a dense coating; the plasma arc of the SAPS method The temperature is close to 10,000°C, which can be used for the preparation of ultra-high and high-melting point ceramic coati...

Claims

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Application Information

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IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/52C04B41/009C04B41/5059C04B41/455C04B41/0072C04B41/5071C04B41/4527C04B35/83
Inventor 刘菲李贺军付前刚贺辛亥
Owner XI'AN POLYTECHNIC UNIVERSITY
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