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Preparation method for ultralong nanowire toughed ceramic coating

A nanowire toughening and ceramic coating technology, which is applied in the field of preparation of ultra-long nanowire toughened ceramic coatings, can solve the problems of easy cracking of the coating, limited toughening effect, low aspect ratio, etc. Oxidation ability, reduced cracking tendency, and improved toughness

Inactive Publication Date: 2013-05-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology alleviates the cracking tendency of the ceramic coating in the high and low temperature alternating process to a certain extent, and improves the oxidation resistance of the ceramic coating to the C / C composite material, the traditional nanowire itself has a relatively low aspect ratio. Limits its toughening effect in ceramic coatings
Therefore, the prepared coating is still prone to cracking in the process of alternating high and low temperatures, which ultimately leads to its unsatisfactory anti-oxidation ability for C / C composites.

Method used

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  • Preparation method for ultralong nanowire toughed ceramic coating
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  • Preparation method for ultralong nanowire toughed ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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.

[0032] Weigh 60g of Si powder, 15g of SiC powder, 15g of C powder, 10g of Al 2 o 3 pink. Place in a 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.

[0033] Put the above 1 / 4 embedding powder into the graphite crucible, put the prepared C / C composite material, and then put the above 1 / 4 embedding powder, so that the powder evenly covers the C / C composite material, then put the graphite crucible into the high-temperature reaction sintering furnace, then raise the furnace temperature to 2200°C, the heating rate is 10°C / min, then keep it warm for 1h, then turn off the power and naturally cool to room temperature, and pass Ar in the...

Embodiment 2

[0037] 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.

[0038] Weigh 72g of Si powder, 10g of SiC powder, 11g of C powder and 7g of Al 2 o 3 pink. Place in a 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.

[0039] Put the above 1 / 4 embedding powder into the graphite crucible, put the prepared C / C composite material, and then put the above 1 / 4 embedding powder, so that the powder evenly covers the C / C composite material, then put the graphite crucible into the high-temperature reaction sintering furnace, then raise the furnace temperature to 2100°C, the heating rate is 7°C / min, then keep it warm for 2h, then turn off the power and naturally cool to room temperature, and pass Ar in th...

Embodiment 3

[0043] 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.

[0044] Weigh 85g of Si powder, 5g of SiC powder, 7g of C powder, 3g of Al 2 o 3 pink. Place in a 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.

[0045] Put the above 1 / 4 embedding powder into the graphite crucible, put the prepared C / C composite material, and then put the above 1 / 4 embedding powder, so that the powder evenly covers the C / C composite material , and then put the graphite crucible into a high-temperature reaction sintering furnace, then raise the furnace temperature to 2000°C with a heating rate of 5°C / min, then keep it warm for 2h, then turn off the power and cool it down to room temperature naturally, and use A...

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Abstract

The invention relates to a preparation method for an ultralong nanowire toughed ceramic coating. An anti-oxidation ceramic coating made from a C / C composite material is toughened by adopting an ultralong SiC nanowire, and a load in a base body can be effectively transferred onto the nanowire by higher length-diameter ratio of the nanowire, so that the toughness of the ceramic coating is enhanced, the cracking trend of the ceramic coating is weakened, and the oxidation resistance of the ceramic coating is improved at last. Compared with the prior art, the prepared SiC nanowire toughened ceramic coating can be used for effectively preventing the C / C composite material from being oxidized. The research result shows that a coating test piece is kept in a weight gain state all the time in a thermogravimetry test process at a room temperature of 1500 DEG C, and the maximum weight gain rate is 1.21%-1.43%.

Description

technical field [0001] The invention relates to a preparation method of an ultralong nanowire toughened ceramic coating, in particular to a preparation method of an ultralong SiC nanowire toughened carbon / carbon (C / C) composite anti-oxidation ceramic coating. Background technique [0002] Oxidation at high temperature is the most difficult bottleneck problem in the practical application of C / C composite materials as thermal structural materials. Researchers at home and abroad have proposed many solutions, among which ceramic coating technology is an effective means to solve the problem of high temperature and easy oxidation of C / C composites. However, in the actual application process, due to the thermal expansion coefficient mismatch between the ceramic coating and the C / C substrate, it is easy to cause the coating to crack during the high and low temperature alternating process, thereby reducing its anti-oxidation ability. In order to alleviate the cracking tendency of ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
Inventor 李贺军褚衍辉付前刚李克智李露
Owner NORTHWESTERN POLYTECHNICAL UNIV
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