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Composite coating and application thereof in carbon/carbon composite material

A carbon composite material and composite coating technology, which is applied in the field of anti-oxidation carbon/carbon composite material manufacturing, can solve the problems of low temperature resistance level of anti-oxidation coating and poor matrix interface matching, so as to reduce thermal expansion difference, The effect of high temperature resistance and enhanced bonding strength

Active Publication Date: 2015-02-11
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low temperature resistance level of the existing carbon / carbon composite material surface anti-oxidation coating and poor matching with the substrate interface, and propose a composite coating and its application in carbon / carbon composite materials , improve the performance and service life of carbon / carbon composites in ultra-high temperature aerobic environment

Method used

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  • Composite coating and application thereof in carbon/carbon composite material

Examples

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Effect test

Embodiment 1

[0028] 1) SiC, Si, Al with a purity of 95% and a particle size of 200 mesh 2 o 3 Put 500g of powder C and 500g each in an oven at 150°C for 2 hours and take it out, according to the weight ratio of the ingredients SiC:Si:Al 2 o 3 : C=4:4:1:1 Weigh the raw materials with a total weight of 1000g and put them into a ball mill tank, mix them at a speed of 30 rpm for 10 hours, then take them out for later use.

[0029] 2) After cleaning and drying the carbon / carbon composite material sample, place it in a graphite crucible, and embed it with the mixed reaction powder around it. Before the sample was embedded, the graphite crucible was dried at 150°C / 2 hours, and carbon felt was laid around the crucible. Subsequently, the graphite crucible was put into a high-temperature furnace, and after the furnace was vacuumed for 20 minutes, it was protected by argon gas, and the temperature was raised to 1800 ° C for 4 hours. After cooling with the furnace, it was taken out, cleaned with al...

Embodiment 2

[0038] Same as Example 1, the difference is that the sol prepared in step 3) is Y-Si-O sol, specifically: take 0.1mol yttrium nitrate and dissolve it in 0.5mol deionized water, add 1mol absolute ethanol after it is completely dissolved, and Stir with a magnetic stirrer at room temperature for 30 minutes, then slowly add 0.1 mol tetraethyl orthosilicate dropwise under stirring conditions, continue stirring until the solution is clear and transparent, stop stirring, and age for 24 hours to obtain Y-Si-O sol; The sintering temperature in step 7) is 1800° C. to obtain a SiC / Y-Si-O composite coating.

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Abstract

The invention relates to a composite coating and application thereof in a carbon / carbon composite material, and belongs to the technical field of manufacturing of an anti-oxidizing carbon / carbon composite material. An SiC coating which is similar to a coefficient of thermal expansion of the carbon / carbon composite material is adopted as a base transition layer; the SiC coating is prepared by adopting an in situ chemical reaction method; gradient transition of Si-C is achieved on carbon / carbon composite material matrix; the binding strength of the carbon / carbon matrix and the SiC coating is enhanced; the difference of thermal expansion between the carbon / carbon matrix and an M-Si-O coating is effectively relieved; the M-Si-O coating with high temperature resistance grade, low oxygen diffusion coefficient and high thermal emissivity is selected as an outer coating; the M-Si-O coating is prepared by sol dipping-high temperature sintering treatment.

Description

technical field [0001] The invention relates to a composite coating and its application in carbon / carbon composite materials, belonging to the technical field of oxidation-resistant carbon / carbon composite materials. Background technique [0002] Carbon / carbon composite material is currently the material with the best high-temperature mechanical properties in an inert atmosphere and the best ablation performance in an ablation environment. Its strength increases with the increase of temperature from room temperature to 2000 °C. This unique high-temperature performance retention of carbon / carbon composites is unique in the material family and has become a key material for heat-resistant structures in the aerospace industry and other fields. However, the unique high-temperature strength retention rate of carbon / carbon composites is obtained in an inert atmosphere, while carbon / carbon composites are mostly used in high-temperature or even ultra-high-temperature oxidizing enviro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/31C04B41/89
Inventor 樊桢李兴超蔡东旭徐林程家张中伟宋永忠
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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