Preparation method for anti-oxidant silica-based ceramic coating with wide temperature range for carbon/carbon composite

A carbon composite material and anti-oxidation silicon-based technology, which is applied in the field of preparation of carbon/carbon composite material anti-oxidation silicon-based ceramic coatings in a wide temperature range, can solve the problems of insufficient bonding force, unsatisfactory coating compactness, and limitations. Problems such as thermal expansion mismatch, to overcome the effect of poor compactness

Active Publication Date: 2012-10-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the thermal expansion coefficient mismatch between the inner and outer coatings and the insufficient bonding force between the prepared nanowires and the SiC inner coating, the nanowire porous layer is limited to alleviate the thermal expansion mismatch between the inner and outer coatings; at the same time, the preparation The nanowire porous layer contains more impurities, which hinders the infiltration and diffusion of the coating powder to a certain extent, and affects the compactness of the coating and the interface bonding with the C / C matrix; making the prepared Coating density is not very ideal
Therefore, the coating is still prone to cracking in the process of alternating high and low temperatures, which ultimately leads to the unsatisfactory wide temperature range oxidation resistance of the prepared coating for C / C composites.

Method used

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  • Preparation method for anti-oxidant silica-based ceramic coating with wide temperature range for carbon/carbon composite
  • Preparation method for anti-oxidant silica-based ceramic coating with wide temperature range for carbon/carbon composite
  • Preparation method for anti-oxidant silica-based ceramic coating with wide temperature range for carbon/carbon composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The C / C composite material was polished and polished sequentially with No. 400, No. 800 and No. 1000 sandpaper respectively, washed with absolute ethanol, and dried in an oven for later use.

[0029] Weigh 75g of Si powder, 15g of SiC powder, 15g of C powder, 10g of Al 2 o 3 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and diameters into the ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 2 hours to obtain embedding powder.

[0030] Put 1 / 4 of the embedding powder into the graphite crucible, put the prepared C / C composite material, then put 1 / 4 of the embedding powder, shake the crucible slightly, so that the powder can evenly embed C / C composite material, and then put the graphite crucible into a vertical vacuum furnace with graphite as a heating element. After evacuating for 30 minutes, make the vacuum degree reach -0.09MPa, keep the vacuum for 30 minutes, and observe whether the indicati...

Embodiment 2

[0034]The C / C composite material was polished and polished sequentially with No. 400, No. 800 and No. 1000 sandpaper respectively, washed with absolute ethanol, and dried in an oven for later use.

[0035] Weigh 78g of Si powder, 10g of SiC powder, 11g of C powder, 6g of A l 2O 3 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and diameters into the ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 3 hours to obtain embedding powder.

[0036] Put 1 / 4 of the embedding powder into the graphite crucible, put the prepared C / C composite material, then put 1 / 4 of the embedding powder, shake the crucible slightly, so that the powder can evenly embed C / C composite material, and then put the graphite crucible into a vertical vacuum furnace with graphite as a heating element. After evacuating for 30 minutes, make the vacuum degree reach -0.09MPa, keep the vacuum for 30 minutes, and observe whether the indication...

Embodiment 3

[0040] The C / C composite material was polished and polished sequentially with No. 400, No. 800 and No. 1000 sandpaper respectively, washed with absolute ethanol, and dried in an oven for later use.

[0041] Weigh 85g of Si powder, 5g of SiC powder, 7g of C powder, 3g of Al 2 o 3 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and diameters into the ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 4 hours to obtain embedding powder.

[0042] Put 1 / 4 of the embedding powder into the graphite crucible, put the prepared C / C composite material, then put 1 / 4 of the embedding powder, shake the crucible slightly, so that the powder can evenly embed C / C composite material, and then put the graphite crucible into a vertical vacuum furnace with graphite as a heating element. After evacuating for 30 minutes, make the vacuum degree reach -0.09MPa, keep the vacuum for 30 minutes, and observe whether the indication ...

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Abstract

The invention relates to a preparation method for an anti-oxidant silica-based ceramic coating with a wide temperature range for a carbon/carbon composite. The preparation method has the technical characteristics of preparing a silica-based ceramic coating toughened by SiC nanowires on the surface of the carbon/carbon composite by employing a combination of an embedding impregnation method and an in-situ synthesis method. The preparation method overcomes problems of poor compactness and the mismatch of thermal expansion between an inside layer and an outside layer of the silica-based ceramic coating toughened by SiC nanowires prepared by the background technology. The prepared coating can realize anti-oxidant protection in the wide temperature range for the C/C composite. The results show that the C/C composite with the prepared coating keeps a weight gain state all the time in a thermogravimetry testing process at the temperature of 1500 DEG C, and the maximum weight gain rate id 1.078%-1.156%.

Description

technical field [0001] The invention relates to a preparation method of a carbon / carbon composite material wide temperature range anti-oxidation silicon-based ceramic coating, Background technique [0002] Oxidation at high temperature is the most difficult bottleneck problem to break through in the practical application of thermal structural C / C composites, especially to realize the anti-oxidation protection of the material in a wide temperature range. At present, researchers at home and abroad have proposed some solutions, and preparing multi-layer anti-oxidation coatings on its surface is an effective means. Among them, silicon-based ceramic coatings have good oxidation resistance and are compatible with C / C composite materials. There is good physical and chemical compatibility between them, and it is an ideal coating material for C / C composites. [0003] Literature "Oxidation protection of C / C composites with a multilayer coating of SiC and Si+SiC+SiC nanowires, Chu Yan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/83C04B41/85
Inventor 李贺军褚衍辉付前刚李克智邹旭
Owner NORTHWESTERN POLYTECHNICAL UNIV
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