TY - JOUR
T1 - Microstructure evolution and oxidation behavior of SiC-HfB2-MoSi2 coating prepared by gaseous/liquid silicon infiltration
AU - Zhang, Jiaping
AU - Su, Xiaoxuan
AU - Tan, Chenglong
AU - Hou, Jiaqi
AU - Zhang, Shubo
AU - Fu, Qiangang
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2025/1/15
Y1 - 2025/1/15
N2 - Targeting the issue of C/C composites easily oxidizing at elevated temperatures, SiC-HfB2-MoSi2 coating was prepared on C/C-SiC-HfB2 composites. This paper presents a comparative study of the microstructure and oxidation resistance of the coating prepared by gaseous infiltration silicon (GSI) and liquid infiltration silicon (LSI), respectively. The silicon infiltration process was simulated to assist in analyzing the morphology changes of the coating. The GSI coating is denser and more uniform than the LSI coating, whose bottom coating is thin and defective. These morphological differences are mainly due to the rearrangement of the ceramics in the coating with the flow of Si. The GSI coating protected the matrix for 78 h at 1700 °C with a mass loss of only 1.67 %, demonstrating good oxidation resistance, while the LSI coating lost 3.19 % of its mass after oxidation for 34 h. The primary reason for the discrepancy is that the GSI coating has a more homogeneous, dense structure than the LSI coating, providing a better oxygen barrier. This work provided a technical reference for the stable service of C/C composites in a high-temperature aerobic environment.
AB - Targeting the issue of C/C composites easily oxidizing at elevated temperatures, SiC-HfB2-MoSi2 coating was prepared on C/C-SiC-HfB2 composites. This paper presents a comparative study of the microstructure and oxidation resistance of the coating prepared by gaseous infiltration silicon (GSI) and liquid infiltration silicon (LSI), respectively. The silicon infiltration process was simulated to assist in analyzing the morphology changes of the coating. The GSI coating is denser and more uniform than the LSI coating, whose bottom coating is thin and defective. These morphological differences are mainly due to the rearrangement of the ceramics in the coating with the flow of Si. The GSI coating protected the matrix for 78 h at 1700 °C with a mass loss of only 1.67 %, demonstrating good oxidation resistance, while the LSI coating lost 3.19 % of its mass after oxidation for 34 h. The primary reason for the discrepancy is that the GSI coating has a more homogeneous, dense structure than the LSI coating, providing a better oxygen barrier. This work provided a technical reference for the stable service of C/C composites in a high-temperature aerobic environment.
KW - C/C-SiC-HfB composites
KW - Oxidation resistance
KW - SiC-HfB-MoSi coating
KW - Silicon infiltration
UR - http://www.scopus.com/inward/record.url?scp=85212139902&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2024.131656
DO - 10.1016/j.surfcoat.2024.131656
M3 - 文章
AN - SCOPUS:85212139902
SN - 0257-8972
VL - 496
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 131656
ER -