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A kind of preparation method of c/c composite material and its surface anti-oxidation composite coating

A composite material and composite coating technology, which is applied in the field of preparation of C/C composite materials and their surface anti-oxidation composite coating, can solve the problems of long preparation cycle, unfavorable double SiC composite coating, long heat preservation time, etc., and achieve The effect of short preparation cycle, good combination and lower preparation temperature

Inactive Publication Date: 2016-12-14
HEBEI VOCATIONAL & TECHN COLLEGE OF BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation of double-SiC composite coatings on the surface of C / C composite materials is mainly based on traditional preparation processes. The preparation of inner and outer coatings needs to be carried out step by step, and the preparation cycle is long, especially the preparation temperature is high. is also longer, which is not conducive to the preparation of well-bonded, crack-free dual-SiC composite coatings

Method used

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  • A kind of preparation method of c/c composite material and its surface anti-oxidation composite coating
  • A kind of preparation method of c/c composite material and its surface anti-oxidation composite coating

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Effect test

Embodiment 1

[0030] The preparation method of the anti-oxidation composite coating on the surface of C / C composite material comprises the following steps:

[0031] The first step: first spread the inner layer of anti-oxidation powder on the surface of the C / C composite material, and then spread the outer layer of anti-oxidation powder to obtain a blank;

[0032] Step 2: put the blank into a discharge plasma sintering furnace, heat-preserve and sinter at 1200°C in a vacuum environment for 1 min, and then take it out of the furnace to obtain the product;

[0033] Wherein, the first layer of anti-oxidation powder is composed of the following components: by weight, 70 parts of elemental Si and 30 parts of elemental C; the second layer of anti-oxidation powder is SiC powder.

Embodiment 2

[0035] The preparation method of the anti-oxidation composite coating on the surface of C / C composite material comprises the following steps:

[0036] The first step: first spread the inner layer of anti-oxidation powder on the surface of the C / C composite material, and then spread the outer layer of anti-oxidation powder to obtain a blank;

[0037] Step 2: Put the blank into a discharge plasma sintering furnace, heat-preserve and sinter at 1250°C for 1 minute in a vacuum environment, and then take it out of the furnace to obtain the product;

[0038] Wherein, the first layer of anti-oxidation powder is composed of the following components: by weight, 70 parts of elemental Si and 30 parts of elemental C; the second layer of anti-oxidation powder is SiC powder.

Embodiment 3

[0040] The preparation method of the anti-oxidation composite coating on the surface of C / C composite material comprises the following steps:

[0041] The first step: first spread the inner layer of anti-oxidation powder on the surface of the C / C composite material, and then spread the outer layer of anti-oxidation powder to obtain a blank;

[0042] Step 2: put the blank into a discharge plasma sintering furnace, heat-preserve and sinter at 1300°C for 1 min in a vacuum environment, and then take it out of the furnace to obtain the product;

[0043] Wherein, the first layer of anti-oxidation powder is composed of the following components: by weight, 70 parts of elemental Si and 30 parts of elemental C; the second layer of anti-oxidation powder is SiC powder.

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Abstract

The invention provides a C / C composite and a preparation method of a surface oxidation resistant composite coating of the C / C composite. The preparation method of the surface oxidation resistant composite coating of the C / C composite comprises the following steps: horizontally laying inner layer oxidation resistant powder on the surface of the C / C composite, and then horizontally laying outer layer oxidation resistant powder to obtain green bodies; placing green bodies into a discharge-produced plasma sintering furnace for sintering for 30 s-1 min at the temperature of 1200-1400 DEG C under an oxygen-free environment, tapping off to obtain the products, wherein the inner layer oxidation resistant powder mainly comprises the following components in parts by weight: 60-70 parts of elementary substance Si and 20-30 parts of elementary substance C; the outer layer oxidation resistant powder is mainly SiC powder. According to the C / C composite and the preparation method of the surface oxidation resistant composite coating of the C / C composite, provided by the invention, the preparation steps of the outer layer coating and the inner layer coating is not required to be carried out separately, the preparation temperature is low, the preparation time is short, the prepared oxidation coating is uniform, compact, well combined with the matrix and high in oxidation resistance temperature.

Description

technical field [0001] The invention relates to the field of C / C composite materials, in particular to a preparation method of a C / C composite material and an anti-oxidation composite coating on the surface thereof. Background technique [0002] C / C composite materials have excellent properties such as low density, low thermal expansion coefficient, stable friction coefficient, and ablation resistance, especially the characteristics that their mechanical properties do not decrease but increase with the increase of temperature, so they are an ideal aerospace high-temperature structure. Material. However, C / C composites will be rapidly oxidized in an oxidizing atmosphere above 450 °C, and their physical and mechanical properties will drop sharply, which limits their application in high-temperature aerobic atmospheres. Therefore, improving the oxidation resistance of C / C composites is a key issue in solving their applications in aerospace and other fields. However, using vari...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/50C04B41/85
Inventor 张向红朱玉春宋红霞盛晓晨
Owner HEBEI VOCATIONAL & TECHN COLLEGE OF BUILDING MATERIALS
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