Tailoring the initial characterization of fully stabilized HfO2 with Y2O3/Ta2O5

Jieyan Yuan; Xin Zhou; Shujuan Dong; Jianing Jiang; Longhui Deng; Wenjia Song; Donald B. Dingwell; Xueqiang Cao

doi:10.1016/j.jallcom.2021.159113

Tailoring the initial characterization of fully stabilized HfO₂ with Y₂O₃/Ta₂O₅

Jieyan Yuan
, Xin Zhou
, Shujuan Dong
, Jianing Jiang
, Longhui Deng
, Wenjia Song^*
, Donald B. Dingwell
, Xueqiang Cao^*

^*Corresponding author for this work

School of Materials Science and Engineering

Wuhan University of Technology
Ludwig Maximilian University of Munich

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

New ceramic materials for thermal barrier coating (TBC) are a key to more powerful and efficient next-generation gas turbines. Here, we investigate the effect of the two novel dopants, Ta₂O₅ and Y₂O₃, on the phase stability, thermophysical and mechanical properties of the HfO₂-based ceramic systems (i.e., Ta₂O₅-HfO₂; Y₂O₃-HfO₂). For the Ta₂O₅-HfO₂ system, we observe the formation of a new compound, Hf₆Ta₂O₁₇. In the Y₂O₃-HfO₂ system, stabilized HfO₂ with up to 18 mol% YO_1.5 (YSH) is generated, whereby monoclinic HfO₂ transforms to cubic HfO₂. The cubic YSH ceramics demonstrate enhanced phase stability, compared with Hf₆Ta₂O₁₇ at temperatures up to 1300 °C. The mechanical properties, thermal expansion and fracture toughness of 18–24 mol% YSH (YO_1.5 = 18–24 mol%) indicate that cubic YSH exhibits enhanced suitability for higher-temperature.

Original language	English
Article number	159113
Journal	Journal of Alloys and Compounds
Volume	867
DOIs	https://doi.org/10.1016/j.jallcom.2021.159113
State	Published - 25 Jun 2021

Keywords

Hardness
Thermal barrier coatings
Thermal expansion
Thermal stability

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10.1016/j.jallcom.2021.159113

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@article{0a207eda79754559873d2e0b131a8d34,

title = "Tailoring the initial characterization of fully stabilized HfO2 with Y2O3/Ta2O5",

abstract = "New ceramic materials for thermal barrier coating (TBC) are a key to more powerful and efficient next-generation gas turbines. Here, we investigate the effect of the two novel dopants, Ta2O5 and Y2O3, on the phase stability, thermophysical and mechanical properties of the HfO2-based ceramic systems (i.e., Ta2O5-HfO2; Y2O3-HfO2). For the Ta2O5-HfO2 system, we observe the formation of a new compound, Hf6Ta2O17. In the Y2O3-HfO2 system, stabilized HfO2 with up to 18 mol\% YO1.5 (YSH) is generated, whereby monoclinic HfO2 transforms to cubic HfO2. The cubic YSH ceramics demonstrate enhanced phase stability, compared with Hf6Ta2O17 at temperatures up to 1300 °C. The mechanical properties, thermal expansion and fracture toughness of 18{\textendash}24 mol\% YSH (YO1.5 = 18{\textendash}24 mol\%) indicate that cubic YSH exhibits enhanced suitability for higher-temperature.",

keywords = "Hardness, Thermal barrier coatings, Thermal expansion, Thermal stability",

author = "Jieyan Yuan and Xin Zhou and Shujuan Dong and Jianing Jiang and Longhui Deng and Wenjia Song and Dingwell, \{Donald B.\} and Xueqiang Cao",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = jun,

day = "25",

doi = "10.1016/j.jallcom.2021.159113",

language = "英语",

volume = "867",

journal = "Journal of Alloys and Compounds",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Tailoring the initial characterization of fully stabilized HfO2 with Y2O3/Ta2O5

AU - Yuan, Jieyan

AU - Zhou, Xin

AU - Dong, Shujuan

AU - Jiang, Jianing

AU - Deng, Longhui

AU - Song, Wenjia

AU - Dingwell, Donald B.

AU - Cao, Xueqiang

PY - 2021/6/25

Y1 - 2021/6/25

N2 - New ceramic materials for thermal barrier coating (TBC) are a key to more powerful and efficient next-generation gas turbines. Here, we investigate the effect of the two novel dopants, Ta2O5 and Y2O3, on the phase stability, thermophysical and mechanical properties of the HfO2-based ceramic systems (i.e., Ta2O5-HfO2; Y2O3-HfO2). For the Ta2O5-HfO2 system, we observe the formation of a new compound, Hf6Ta2O17. In the Y2O3-HfO2 system, stabilized HfO2 with up to 18 mol% YO1.5 (YSH) is generated, whereby monoclinic HfO2 transforms to cubic HfO2. The cubic YSH ceramics demonstrate enhanced phase stability, compared with Hf6Ta2O17 at temperatures up to 1300 °C. The mechanical properties, thermal expansion and fracture toughness of 18–24 mol% YSH (YO1.5 = 18–24 mol%) indicate that cubic YSH exhibits enhanced suitability for higher-temperature.

AB - New ceramic materials for thermal barrier coating (TBC) are a key to more powerful and efficient next-generation gas turbines. Here, we investigate the effect of the two novel dopants, Ta2O5 and Y2O3, on the phase stability, thermophysical and mechanical properties of the HfO2-based ceramic systems (i.e., Ta2O5-HfO2; Y2O3-HfO2). For the Ta2O5-HfO2 system, we observe the formation of a new compound, Hf6Ta2O17. In the Y2O3-HfO2 system, stabilized HfO2 with up to 18 mol% YO1.5 (YSH) is generated, whereby monoclinic HfO2 transforms to cubic HfO2. The cubic YSH ceramics demonstrate enhanced phase stability, compared with Hf6Ta2O17 at temperatures up to 1300 °C. The mechanical properties, thermal expansion and fracture toughness of 18–24 mol% YSH (YO1.5 = 18–24 mol%) indicate that cubic YSH exhibits enhanced suitability for higher-temperature.

KW - Hardness

KW - Thermal barrier coatings

KW - Thermal expansion

KW - Thermal stability

UR - https://www.scopus.com/pages/publications/85101304385

U2 - 10.1016/j.jallcom.2021.159113

DO - 10.1016/j.jallcom.2021.159113

M3 - 文章

AN - SCOPUS:85101304385

SN - 0925-8388

VL - 867

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 159113

ER -

Tailoring the initial characterization of fully stabilized HfO₂ with Y₂O₃/Ta₂O₅

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Keywords

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