TY - JOUR
T1 - Recovery in oxidation behavior of damaged SiC[sbnd]ZrB2/SiC coating of carbon/carbon composites
AU - Wang, Weiyan
AU - Fu, Qiangang
N1 - Publisher Copyright:
© 2022 The Authors
PY - 2023/5
Y1 - 2023/5
N2 - Polysiloxane (PSO) was adopted as the matrix of the repair agents, and SiC[sbnd]ZrB2 powder was used as the filler, to repair the prefabricated defects on the SiC[sbnd]ZrB2/SiC (SZS) coating of carbon/carbon (C/C) composites. The repair agents were brushed on the defect areas and then underwent preoxidation (PR) or heat-treatment (HR) in a vacuum. The effects of different treatment processes on the chemical composition, microstructure of the repair agents, and the oxidation resistance behavior of the repaired coating were investigated. The repaired agents after both processes were pyrolyzed and generated SiOC ceramics, and they were well combined with the original coating. The thermal stability of PSO after preoxidation is poorer than that after heat-treatment, resulting in a weight loss rate of 5.88% after oxidation at 1 500 °C for 270 min, while that of the HR coating is only −0.87%, yet both have been great improvement compared with the unrepaired coating. This work provides an effective and simple approach to repairing damaged coatings for high-temperature applications.
AB - Polysiloxane (PSO) was adopted as the matrix of the repair agents, and SiC[sbnd]ZrB2 powder was used as the filler, to repair the prefabricated defects on the SiC[sbnd]ZrB2/SiC (SZS) coating of carbon/carbon (C/C) composites. The repair agents were brushed on the defect areas and then underwent preoxidation (PR) or heat-treatment (HR) in a vacuum. The effects of different treatment processes on the chemical composition, microstructure of the repair agents, and the oxidation resistance behavior of the repaired coating were investigated. The repaired agents after both processes were pyrolyzed and generated SiOC ceramics, and they were well combined with the original coating. The thermal stability of PSO after preoxidation is poorer than that after heat-treatment, resulting in a weight loss rate of 5.88% after oxidation at 1 500 °C for 270 min, while that of the HR coating is only −0.87%, yet both have been great improvement compared with the unrepaired coating. This work provides an effective and simple approach to repairing damaged coatings for high-temperature applications.
KW - Carbon/carbon composites
KW - Coating repair
KW - Oxidation behavior
KW - PSO
UR - http://www.scopus.com/inward/record.url?scp=85145725540&partnerID=8YFLogxK
U2 - 10.1016/j.jmat.2022.11.008
DO - 10.1016/j.jmat.2022.11.008
M3 - 文章
AN - SCOPUS:85145725540
SN - 2352-8478
VL - 9
SP - 541
EP - 550
JO - Journal of Materiomics
JF - Journal of Materiomics
IS - 3
ER -