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Preparation (sic nw )/(zrc matrix-coating integration) method for modifying c/c composites

A composite material and coating technology, applied in the field of preparation/modification of C/C composite materials, can solve problems such as poor connection performance and fusion, and achieve improved ablation resistance, good economic and social benefits, and low preparation temperature. Effect

Active Publication Date: 2022-07-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the modification of the substrate and the preparation of the coating are prepared separately, so there is still an obvious gap between the doped substrate and the coating, the connection performance and fusion of the two are poor, and it is difficult to fully utilize the advantages of the combination of the two methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Cut low-density C / C composite materials into φ28*10mm 3 The cylinder was cleaned by ultrasonic and used for later use. Ethyl orthosilicate, absolute ethanol, and deionized water were sequentially mixed in a ratio of about 6:3:1, the pH value was adjusted to 3 with hydrochloric acid, and stirred at 60 °C for 2 h to obtain a silica sol. The low-density C / C composites were naturally immersed in silica sol for 7 days, and after drying, pyrolytic carbon was deposited by chemical vapor infiltration for 1 h. Finally, it was kept in a heat treatment furnace at 1500°C for 2 hours, cooled to room temperature and then put into the ZrC precursor dipping solution. The immersion solution of ZrC precursor is prepared by mixing xylene and ZrC precursor in a ratio of 2:4, and after sonicating for half an hour, put it into a magnetic stirrer and stir for more than 1 hour. Then put the beaker containing the sample and ZrC precursor impregnation solution into the vacuum impregnation box,...

example 2

[0029] Cut low-density C / C composite materials into φ28*10mm 3The cylinder was cleaned by ultrasonic and used for later use. Ethyl orthosilicate, absolute ethanol, and deionized water were sequentially mixed in a ratio of about 9:3:1, the pH value was adjusted to 5 with hydrochloric acid, and stirred at 70 °C for 2 hours to obtain a silica sol. The low-density C / C composites were naturally immersed in silica sol for 7 days, and then the pyrolytic carbon was deposited by chemical vapor infiltration for 3 hours after drying. Finally, it was kept in a heat treatment furnace at 1500 °C for 2 h, cooled to room temperature and then put into the ZrC precursor dipping solution. The immersion solution of ZrC precursor is prepared by mixing xylene and ZrC precursor in a ratio of 2:4, and after sonicating for half an hour, put it into a magnetic stirrer and stir for more than 1 hour. Then put the beaker containing the sample and ZrC precursor impregnation solution into the vacuum impre...

example 3

[0031] Cut low-density C / C composite materials into φ28*10mm 3 The cylinder was cleaned by ultrasonic and used for later use. Ethyl orthosilicate, anhydrous ethanol, and deionized water were sequentially mixed in a ratio of about 5:4:1, the pH value was adjusted to 3 with hydrochloric acid, and stirred at 70 °C for 2 h to obtain a silica sol. The low-density C / C composites were naturally immersed in silica sol for 14 days, and after drying, pyrolytic carbon was deposited by chemical vapor infiltration for 3 hours. Finally, it was kept in a heat treatment furnace at 1600 °C for 2 hours, cooled to room temperature and then put into the ZrC precursor dipping solution. The immersion solution of ZrC precursor is prepared by mixing xylene and ZrC precursor in a ratio of 2:4, and after sonicating for half an hour, put it into a magnetic stirrer and stir for more than 1 hour. Then put the beaker containing the sample and ZrC precursor impregnation solution into the vacuum impregnati...

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Abstract

The present invention relates to a preparation (SiC NW ) / (ZrC matrix-coating integration) modification method of C / C composite material, by pre-preparing SiC nanowire skeleton, so that ZrC ceramic doped matrix can be prepared by PIP method and ZrC(SiC) can be formed on the surface of the matrix Ceramic coating. The method can make the ZrC (SiC) ceramic coating and the doped substrate integrally formed, which can not only effectively block the erosion of the substrate by oxygen atmosphere and high-speed particles, but also reduce the oxidation activity of the substrate. The mismatch of thermal expansion coefficients improves the long-term ablation resistance of C / C composites as a whole from the inside to the outside. The invention has simple operation, low preparation temperature, little damage to the matrix and low cost, can provide certain theoretical and experimental assistance for the application of the C / C composite material in a high temperature ablation environment, and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of material thermal protection, and relates to a preparation (SiC) NW ) / (ZrC matrix-coating integration) method for modifying C / C composites, in particular to a method for preparing (SiC nanowire skeleton modified precursor impregnation pyrolysis (PIP) method) NW ) / (ZrC matrix-coating integration) method for modifying C / C composites. Background technique [0002] Carbon / carbon (C / C) composites have a series of advantages such as low density, high strength, high modulus, corrosion resistance, wear resistance, etc., as well as the characteristics of mechanical properties that do not drop but rise at high temperatures, making them an aerospace industry. One of the most potential candidates for high temperature thermal structural components in the field. However, C / C composites are easily oxidized at high temperature, and their mechanical properties decrease rapidly with the increase of oxidation rate, which s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87C04B35/84
CPCC04B41/87C04B41/009C04B41/5059C04B35/83C04B41/456C04B41/5057C04B41/4552C04B41/4554
Inventor 李贺军田新发史小红林红娇杨莉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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