TY - JOUR
T1 - Comparison of ablation performances and sublayer interaction of CVD-(TaC/SiC)3 alternate coatings with different crystallite morphologies
AU - Kong, Jing'an
AU - Zhang, Yulei
AU - Chen, Guohui
AU - Gai, Wenhan
AU - Fu, Yanqin
AU - Lin, Yunzhou
AU - Li, Hejun
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/5/15
Y1 - 2024/5/15
N2 - To compare the influence of crystallite morphology on the synergistic effect between different sublayers under oxyacetylene flame (O2/CH4 flux ratio: ~1.33), (TaC/SiC)3 alternate coatings were prepared on C/C composites by chemical vapor deposition via triple cycles of TaC/SiC sequences, whose TaC sublayers were composed of acicular (AS-6) and columnar crystals (CS-6) respectively. After the cyclic ablation tests with a heat flux of 2.48 MW/m2, the CS-6 sample exhibited favorable thermal shock resistance through layer-by-layer protection than coating exfoliation of the AS-6 specimen. Their SiC layers also performed different ablative behaviors, which transformed from acute evaporation of SiO2 glass for the SiC single layer to the eroded surface with pits distributed of the AS-6 specimen, and further the integrated scale with glass covered of the CS-6 sample. The stress relaxation resulting from the formation of porous middle layer and the enhanced reinforcement of Ta2O5 particles for SiO2 glass to improve evaporation suppression may be the main reasons for the superior synergistic effect of the CS-6 sample.
AB - To compare the influence of crystallite morphology on the synergistic effect between different sublayers under oxyacetylene flame (O2/CH4 flux ratio: ~1.33), (TaC/SiC)3 alternate coatings were prepared on C/C composites by chemical vapor deposition via triple cycles of TaC/SiC sequences, whose TaC sublayers were composed of acicular (AS-6) and columnar crystals (CS-6) respectively. After the cyclic ablation tests with a heat flux of 2.48 MW/m2, the CS-6 sample exhibited favorable thermal shock resistance through layer-by-layer protection than coating exfoliation of the AS-6 specimen. Their SiC layers also performed different ablative behaviors, which transformed from acute evaporation of SiO2 glass for the SiC single layer to the eroded surface with pits distributed of the AS-6 specimen, and further the integrated scale with glass covered of the CS-6 sample. The stress relaxation resulting from the formation of porous middle layer and the enhanced reinforcement of Ta2O5 particles for SiO2 glass to improve evaporation suppression may be the main reasons for the superior synergistic effect of the CS-6 sample.
KW - Ablation performance
KW - Alternate structure
KW - Carbon/carbon composite
KW - Crystallite morphology
KW - Ta-Si-O compound glass
UR - http://www.scopus.com/inward/record.url?scp=85190545452&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2024.130801
DO - 10.1016/j.surfcoat.2024.130801
M3 - 文章
AN - SCOPUS:85190545452
SN - 0257-8972
VL - 483
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 130801
ER -