Preparation method of beaded nanowire toughened and reinforced ceramic coat

A nanowire toughening and ceramic coating technology is applied in the field of preparation of bead string nanowire toughening and reinforced ceramic coatings, which can solve the limitation of nanowire toughening and strengthening, and the anti-oxidation ability of C/C composite materials is not ideal. , the coating is easy to crack, etc., to achieve the effect of reducing the cracking trend

Active Publication Date: 2013-11-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, due to the inherent toughening defects of the traditional nanowires prepared by the chemical vapor deposition method and the insufficient bonding force with the SiC inner coating, the effectiveness of the nanowires in the coating is limited. Therefore, the coating It is still easy to crack in the process of high and low temperature alternating, which eventually leads to the unsatisfactory anti-oxidation ability of the prepared coating for C / C composite materials

Method used

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  • Preparation method of beaded nanowire toughened and reinforced ceramic coat
  • Preparation method of beaded nanowire toughened and reinforced ceramic coat
  • Preparation method of beaded nanowire toughened and reinforced ceramic coat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 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.

[0033] 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.

[0034] Put the above 1 / 2 embedding powder into the graphite crucible, put the prepared C / C composite material, and then put the above 1 / 2 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

[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 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.

[0042] Put the above 1 / 2 embedding powder into the graphite crucible, put the prepared C / C composite material, and then put the above 1 / 2 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

[0048] 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.

[0049] 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.

[0050] Put the above 1 / 2 embedding powder into the graphite crucible, put the prepared C / C composite material, and then put the above 1 / 2 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 2000°C, the heating rate is 5°C / min, then keep it warm for 3h, then turn off the power and naturally cool to room temperature, and pass Ar in the who...

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Abstract

The invention relates to a preparation method of a beaded nanowire toughened and reinforced ceramic coat. A beaded SiC nanowire toughened and reinforced Si-Cr ceramic coat is prepared through adopting an in-situ synthesis process, and the combination of the special toughening efficacy possessed by the in-situ synthesized beaded nanowire and a strong interface formed between the nanowire and an internal coat reduces the cracking trend of the coat to make the ceramic coat have a compact structure, so the effective anti-oxidation time of the prepared ceramic coat in 1500DEG C static air is prolonged to 165-185h from 40h of a background technology.

Description

technical field [0001] The invention relates to a method for preparing a ceramic coating on the surface of a carbon / carbon (C / C) composite material, in particular to a method for preparing a ceramic coating toughened and reinforced by bead string nanowires. 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. Coating technology is an effective means to solve this problem. Among them, ceramic coating is currently the most in-depth research and the most mature anti-oxidation coating system. However, in the actual application process, due to the thermal expansion coefficient mismatch between the 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 ceramic coatings, nanowire to...

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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