The enhanced mechanical properties for Hf6Ta2O17 thin film through component segregation

组分(热力学) 材料科学 薄膜 复合材料 纳米技术 物理 热力学
作者
Weibin Feng,Yu Sun,Chaofan Fan,Junhui Luo,Wangtao Zhu,Li Yang,Yichun Zhou
出处
期刊:Thin Solid Films [Elsevier BV]
卷期号:799: 140408-140408
标识
DOI:10.1016/j.tsf.2024.140408
摘要

With outstanding thermal and mechanical properties, Hf6Ta2O17 emerges as an ideal candidate for next-generation thermal barrier coatings (TBC) material. However, high-temperature process during TBC fabrication will inevitably lead to Ta2O5/HfO2 component segregation because large differences in vapor pressure. In this paper, Hf6Ta2O17 polycrystalline film with different Ta2O5/HfO2 component was prepared on sapphire substrate by sol-gel method through spin coating. Morphological analysis indicates the excessive Ta2O5 can reduce the porosity in Hf6Ta2O17 thin film through eutectic process, while excessive HfO2 will lead to a worse morphology and smaller average grain size. Nanoindentation reveals that component segregation of excessive Ta2O5/HfO2 could both be used to strengthen of Hf6Ta2O17 through different mechanisms. In addition, a higher elastic recovery rate in excessive Ta2O5 system indicates Ta2O5Hf6Ta2O17 eutectic system could accelerate energy dissipation and further enhance the toughness for Hf6Ta2O17. This work provides a deep insight into the strengthening mechanism of ceramics Hf6Ta2O17 with component segregation and paves the way to design of next-generation TBCs.
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