Self-healing performance of niobium suboxide-based solid solution for UHTC coating during oxyacetylene test

Ruixiang He, Kezhi Li, Qian Liu

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摘要

In this work, NbC coatings modified with different contents (0, 25 and 50 mol%) of HfC were deposited on SiC-coated C/C composites via supersonic atmospheric plasma spraying to study the effect of HfC on the ablation-resistance of the NbC coatings under an oxyacetylene torch. The phase composition and chemical states of Nb2O5–66.67 mol% HfO2 plates heated up to 2100 °C in an Ar atmosphere were investigated. The results confirmed that the effective ablation time of the NbC-coating mixed with 50 mol% HfC was approximately 120 s, which is more than twice that of the pure NbC coating. During air quenching, NbO and NbO2 ultimately transformed into Nb2O5, producing compressive stress that stabilized the t-HfO2 crystals. Furthermore, the formation of hafnium oxide significantly improved the thermal stability and viscosity of the Nb–O film, and the niobium suboxide-based solid solution, possessing an attractive self-healing performance, increased the compactness of the HfO2-based solid solution layer are responsible for the superior ablation performance of the NbC-HfC coating.

源语言英语
文章编号127190
期刊Surface and Coatings Technology
417
DOI
出版状态已出版 - 15 7月 2021

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