TY - JOUR
T1 - The effect of Hf6Ta2O17 self-sintering on the cyclic ablation and mechanical performances of C/Hf-Ta-Si-C composites with a PyC-SiC bilayer interphase
AU - Tong, Mingde
AU - Hou, Wanbo
AU - Shi, Xinhao
AU - Han, Dongcheng
AU - Feng, Tao
AU - Fu, Qiangang
N1 - Publisher Copyright:
© 2025
PY - 2025/4/1
Y1 - 2025/4/1
N2 - As the primary barrier of ultra-high temperature ceramic based composites against high-speed flame ablation, oxidized skins significantly influence ablation resistance and mechanical properties. To enhance the cyclic ablation performance of C/Hf-Si-C composites, Ta was introduced into the matrix through polymer infiltration and pyrolysis method with a Hf:Ta ratio of 3:1, aimed at promoting the self-sintering of the oxidized skin. Cyclic ablation, falling impact and bending performances of C/Hf-Ta-Si-C composites were investigated. The introduction of Ta markedly improved the compactness, cohesion and bonding strength of the oxidized skin on ablated C/Hf-Ta-Si-C composites. As a result of these enhancements, the ablation resistance, impact tolerance and residual flexural strength of the cyclic ablated C/Hf-Ta-Si-C composites significantly increased. After 3 × 60s ablation cycles, the residual flexural strength of the ablated C/Hf-Ta-Si-C composites was about 195.9 ± 20.7 MPa, which was notably higher than that of the 3rd ablated C/Hf-Si-C composites (89.9 ± 12.6 MPa). Interestingly, after the introduction of Ta, the stress decline trend in the ablated composites changed from continuous downward decline to ladder like decline. This was attributed to that the self-sintering of the Hf6Ta2O17 optimized the compactness of the ablated matrix during ablation process and increased the compressive stress on Cf during cooling.
AB - As the primary barrier of ultra-high temperature ceramic based composites against high-speed flame ablation, oxidized skins significantly influence ablation resistance and mechanical properties. To enhance the cyclic ablation performance of C/Hf-Si-C composites, Ta was introduced into the matrix through polymer infiltration and pyrolysis method with a Hf:Ta ratio of 3:1, aimed at promoting the self-sintering of the oxidized skin. Cyclic ablation, falling impact and bending performances of C/Hf-Ta-Si-C composites were investigated. The introduction of Ta markedly improved the compactness, cohesion and bonding strength of the oxidized skin on ablated C/Hf-Ta-Si-C composites. As a result of these enhancements, the ablation resistance, impact tolerance and residual flexural strength of the cyclic ablated C/Hf-Ta-Si-C composites significantly increased. After 3 × 60s ablation cycles, the residual flexural strength of the ablated C/Hf-Ta-Si-C composites was about 195.9 ± 20.7 MPa, which was notably higher than that of the 3rd ablated C/Hf-Si-C composites (89.9 ± 12.6 MPa). Interestingly, after the introduction of Ta, the stress decline trend in the ablated composites changed from continuous downward decline to ladder like decline. This was attributed to that the self-sintering of the Hf6Ta2O17 optimized the compactness of the ablated matrix during ablation process and increased the compressive stress on Cf during cooling.
KW - Composites
KW - Cyclic ablation
KW - Mechanical properties
KW - Residual stress
KW - Ultrahigh temperature ceramics
UR - http://www.scopus.com/inward/record.url?scp=85215997999&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2025.112149
DO - 10.1016/j.compositesb.2025.112149
M3 - 文章
AN - SCOPUS:85215997999
SN - 1359-8368
VL - 294
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
M1 - 112149
ER -