Repair method for damaged SiC coating carbon/carbon composite material

A carbon composite material and repair method technology, applied in the field of SiO2-Nd2O3/Si-SiC repair system, can solve the problems of C/C composite material matrix oxidation and mechanical property decline, heating of SiC coating, poor ablation resistance and other problems , to achieve the effect of excellent laser reflection ability, smooth surface and low cost

Pending Publication Date: 2021-09-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiC coatings have poor ablation resistance against lasers near 1 μm
Under laser irradiation, the heat accumulation effect will cause the SiC coating to heat up violently and ablate to fail. If the damaged coating is not repaired in time, it will cause the oxidation of the C / C composite matrix and a significant decline in the mechanical properties, causing major damage. ACCIDENT

Method used

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  • Repair method for damaged SiC coating carbon/carbon composite material
  • Repair method for damaged SiC coating carbon/carbon composite material
  • Repair method for damaged SiC coating carbon/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Pretreatment: Along the surface of the damaged area, file and polish the damaged part of the SiC-coated C / C composite material to remove the coating in this area until the C / C composite material matrix is ​​exposed, and the sample is ultrasonically cleaned and baked Dry and set aside.

[0031] 2) Powder preparation: Weigh 55% of Si powder, 30% of SiC powder and 15% of C powder, ball mill and mix for 4 hours as the inner coating powder for later use; in addition, weigh the mass percentage 95% SiO 2 powder with 5% Nd 2 o 3 powder, ball milling and mixing for 4 hours, put it into a muffle furnace, heat up from room temperature to 1773K with the furnace in an air environment, continue heat treatment for 2 hours, and then take it out and air-cool it to obtain SiO 2 -Nd 2 o 3 Block materials, for the convenience of subsequent repairs, are ground into powders and used as outer coating powders for later use.

[0032] 3) Damage repair: Use anhydrous ethanol as a solvent...

Embodiment 2

[0035] 1) Pretreatment: Along the surface of the damaged area, file and polish the damaged part of the SiC-coated C / C composite material to remove the coating in this area until the C / C composite material matrix is ​​exposed, and the sample is ultrasonically cleaned and baked Dry and set aside.

[0036] 2) Powder preparation: Weigh 55% of Si powder, 30% of SiC powder and 15% of C powder, ball mill and mix for 4 hours as the inner coating powder for later use; in addition, weigh the mass percentage 95% SiO 2 powder with 5% Nd 2 o 3 powder, ball milling and mixing for 4 hours, put it into a muffle furnace, heat up from room temperature to 1773K with the furnace in an air environment, continue heat treatment for 2 hours, and then take it out and air-cool it to obtain SiO 2 -Nd 2 o 3 Block materials, for the convenience of subsequent repairs, are ground into powders and used as outer coating powders for later use.

[0037] 3) Damage repair: Use anhydrous ethanol as a solvent...

Embodiment 3

[0040] 1) Pretreatment: Along the surface of the damaged area, file and polish the damaged part of the SiC-coated C / C composite material to remove the coating in this area until the C / C composite material matrix is ​​exposed, and the sample is ultrasonically cleaned and baked Dry and set aside.

[0041] Powder preparation: Weigh 55% of Si powder, 30% of SiC powder and 15% of C powder, and mix them by ball milling for 4 hours as the inner coating powder for later use; in addition, weigh the mass percentage of 95% SiO 2 powder with 5% Nd 2 o 3 powder, ball milling and mixing for 4 hours, put it into a muffle furnace, heat up from room temperature to 1773K with the furnace in an air environment, continue heat treatment for 2 hours, and then take it out and air-cool it to obtain SiO 2 -Nd 2 o 3 Block materials, for the convenience of subsequent repairs, are ground into powders and used as outer coating powders for later use.

[0042] 3) Damage repair: Use anhydrous ethanol a...

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PUM

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Abstract

The invention relates to a repairing method for a damaged SiC coating carbon/carbon composite material, in particular to a SiO2-Nd2O3/Si-SiC repairing system for the damaged SiC coating carbon/carbon composite material and a preparation method of the SiO2-Nd2O3/Si-SiC repairing system, and the damaged part of the SiC coating is locally repaired by adopting a SiO2-Nd2O3/Si-SiC double-layer system based on a laser cladding technology. Wherein the Si-SiC inner coating has good physical and chemical compatibility with the C/C composite material matrix and the SiC coating at the undamaged part, and the recovery of the oxidation protection performance of the repaired sample is facilitated; and the SiO2-Nd2O3 outer coating has extremely strong reflection characteristics on laser with the wave band of about 1 [mu] m, and can effectively reduce the absorption of the material on laser energy and the generation of heat, so that the secondary damage of the laser on the SiC coating is effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of protective coatings, and relates to a method for repairing damaged SiC coated carbon / carbon composite materials, and relates to a method for repairing damaged SiC coated carbon / carbon (C / C) composite materials. 2 -Nd 2 o 3 / Si-SiC repair system and method. Background technique [0002] SiC coated C / C composite materials are often used as thermal structural components serving in extreme environments due to their advantages such as high specific strength, excellent high temperature resistance, and outstanding oxidation resistance. However, SiC coatings have poor ablation resistance against laser light in the vicinity of 1 μm. Under laser irradiation, the heat accumulation effect will cause the SiC coating to heat up violently and ablate to fail. If the damaged coating is not repaired in time, it will cause the oxidation of the C / C composite matrix and a significant decline in the mechanical properties, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/52C04B41/009C04B35/83C04B41/5059C04B41/5096C04B41/4523C04B41/5035C04B41/5045
Inventor 李贺军王翰辉史小红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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