TY - JOUR
T1 - Multi-healing behavior of (NbC-TaC)/ZrC/SiC triple-layer coated C/C composites enduring oxyacetylene flame
AU - He, Ruixiang
AU - Li, Kezhi
AU - Zhang, Wenhao
AU - Liu, Longqi
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/3/15
Y1 - 2023/3/15
N2 - Herein, the ablation resistance of plasma-sprayed TaC-modified NbC (NbC-TaC) coatings on ZrC/SiC double-layer-coated C/C composites was firstly tested using an oxyacetylene flame. Next, the phase composition of ZrO2-Ta2O5 (TaO2.5) systems heat-treated at 2100 °C in an argon atmosphere was determined. The results demonstrated the formation of a free-standing Ta–O film that extended the effective ablation time of the TaC coating to >90 s. Among the NbC-TaC coatings, the 37.5 mol% TaC-addition produced a continuous film, achieving the best ablation property. Multi-healing behavior, comprised of interfacial, in situ, and surficial healing, further improved ablation performance. At 2100 °C, the solubility of TaO2.5 in ZrO2 was 15 mol%, and the stable phases were tetragonal ZrO2 and Ta with face- and body-centered cubic structures. Furthermore, the interfacial bonding conditions of the heat-treated Zr-O-Ta system and the thermal stability mechanism of ZrO2 to Ta2O5 were discussed.
AB - Herein, the ablation resistance of plasma-sprayed TaC-modified NbC (NbC-TaC) coatings on ZrC/SiC double-layer-coated C/C composites was firstly tested using an oxyacetylene flame. Next, the phase composition of ZrO2-Ta2O5 (TaO2.5) systems heat-treated at 2100 °C in an argon atmosphere was determined. The results demonstrated the formation of a free-standing Ta–O film that extended the effective ablation time of the TaC coating to >90 s. Among the NbC-TaC coatings, the 37.5 mol% TaC-addition produced a continuous film, achieving the best ablation property. Multi-healing behavior, comprised of interfacial, in situ, and surficial healing, further improved ablation performance. At 2100 °C, the solubility of TaO2.5 in ZrO2 was 15 mol%, and the stable phases were tetragonal ZrO2 and Ta with face- and body-centered cubic structures. Furthermore, the interfacial bonding conditions of the heat-treated Zr-O-Ta system and the thermal stability mechanism of ZrO2 to Ta2O5 were discussed.
KW - (NbC-TaC)/ZrC coating
KW - Ablation resistance
KW - Carbon/carbon composites
KW - High temperature phase
KW - Thermal stability
UR - http://www.scopus.com/inward/record.url?scp=85146628271&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2023.129255
DO - 10.1016/j.surfcoat.2023.129255
M3 - 文章
AN - SCOPUS:85146628271
SN - 0257-8972
VL - 456
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 129255
ER -