Oxidation behavior of nano-structured (Al2O3+Y2O3)/AlY coating on γ-TiAl upon exposure to 1200 °C

Yi Xu; Pengfei Shi; Shiyu Cui; Yanhui Li; Aoni Xu; Jiaming Wang; Zhengjun Yao; Xuefeng Zhou; Ting Yuan; Wanhui Liu; Jiayuan Chen

doi:10.1016/j.ceramint.2018.11.142

Oxidation behavior of nano-structured (Al₂O₃+Y₂O₃)/AlY coating on γ-TiAl upon exposure to 1200 °C

Yi Xu
, Pengfei Shi
, Shiyu Cui
, Yanhui Li
, Aoni Xu
, Jiaming Wang
, Zhengjun Yao
, Xuefeng Zhou
, Ting Yuan
, Wanhui Liu
, Jiayuan Chen

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

8 Scopus citations

Abstract

Developing γ-TiAl intermetallic alloys as candidate materials for manufacturing components of aircraft gas turbines has been limited because of their poor oxidation resistance at high temperature. In this study, a nano-structured (Al₂O₃+Y₂O₃)/AlY coating was deposited on a γ-TiAl alloy by sputtering, to improve its oxidation resistance. To evaluate this coating under real-life critical operating conditions in aircraft engines, the isothermal oxidation exposure at an elevated temperature of 1200 °C was carried out. The analysis results indicated that Al and Y diffused through the grain boundary to synthesize or grow oxides outward, toward the testing atmosphere during the oxidation tests. During this process, oxygen was somewhat prevented from penetrating the coating because of the strong oxytropism of the coating surface to form Al and Y oxides. The coating exhibited a nanosized Al and Y oxides surface morphology after 100 h of oxidation. Weight change kinetics revealed that the weight gain of the coating was 7.49 mg/cm², while that of the substrate fluctuated because of oxide scale spallation. The nano-structured (Al₂O₃+Y₂O₃)/AlY coating improved the oxidation resistance of the γ-TiAl alloy at elevated temperature.

Original language	English
Pages (from-to)	5163-5167
Number of pages	5
Journal	Ceramics International
Volume	45
Issue number	4
DOIs	https://doi.org/10.1016/j.ceramint.2018.11.142
State	Published - Mar 2019
Externally published	Yes

Keywords

Grain growth
Nano-structure
Oxidation resistance
Thermal application

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10.1016/j.ceramint.2018.11.142

Cite this

@article{399ccfe098964809ae3609f076a3d2fc,

title = "Oxidation behavior of nano-structured (Al2O3+Y2O3)/AlY coating on γ-TiAl upon exposure to 1200 °C",

abstract = "Developing γ-TiAl intermetallic alloys as candidate materials for manufacturing components of aircraft gas turbines has been limited because of their poor oxidation resistance at high temperature. In this study, a nano-structured (Al2O3+Y2O3)/AlY coating was deposited on a γ-TiAl alloy by sputtering, to improve its oxidation resistance. To evaluate this coating under real-life critical operating conditions in aircraft engines, the isothermal oxidation exposure at an elevated temperature of 1200 °C was carried out. The analysis results indicated that Al and Y diffused through the grain boundary to synthesize or grow oxides outward, toward the testing atmosphere during the oxidation tests. During this process, oxygen was somewhat prevented from penetrating the coating because of the strong oxytropism of the coating surface to form Al and Y oxides. The coating exhibited a nanosized Al and Y oxides surface morphology after 100 h of oxidation. Weight change kinetics revealed that the weight gain of the coating was 7.49 mg/cm2, while that of the substrate fluctuated because of oxide scale spallation. The nano-structured (Al2O3+Y2O3)/AlY coating improved the oxidation resistance of the γ-TiAl alloy at elevated temperature.",

keywords = "Grain growth, Nano-structure, Oxidation resistance, Thermal application",

author = "Yi Xu and Pengfei Shi and Shiyu Cui and Yanhui Li and Aoni Xu and Jiaming Wang and Zhengjun Yao and Xuefeng Zhou and Ting Yuan and Wanhui Liu and Jiayuan Chen",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd and Techna Group S.r.l.",

year = "2019",

month = mar,

doi = "10.1016/j.ceramint.2018.11.142",

language = "英语",

volume = "45",

pages = "5163--5167",

journal = "Ceramics International",

issn = "0272-8842",

publisher = "Elsevier Ltd",

number = "4",

}

TY - JOUR

T1 - Oxidation behavior of nano-structured (Al2O3+Y2O3)/AlY coating on γ-TiAl upon exposure to 1200 °C

AU - Xu, Yi

AU - Shi, Pengfei

AU - Cui, Shiyu

AU - Li, Yanhui

AU - Xu, Aoni

AU - Wang, Jiaming

AU - Yao, Zhengjun

AU - Zhou, Xuefeng

AU - Yuan, Ting

AU - Liu, Wanhui

AU - Chen, Jiayuan

PY - 2019/3

Y1 - 2019/3

N2 - Developing γ-TiAl intermetallic alloys as candidate materials for manufacturing components of aircraft gas turbines has been limited because of their poor oxidation resistance at high temperature. In this study, a nano-structured (Al2O3+Y2O3)/AlY coating was deposited on a γ-TiAl alloy by sputtering, to improve its oxidation resistance. To evaluate this coating under real-life critical operating conditions in aircraft engines, the isothermal oxidation exposure at an elevated temperature of 1200 °C was carried out. The analysis results indicated that Al and Y diffused through the grain boundary to synthesize or grow oxides outward, toward the testing atmosphere during the oxidation tests. During this process, oxygen was somewhat prevented from penetrating the coating because of the strong oxytropism of the coating surface to form Al and Y oxides. The coating exhibited a nanosized Al and Y oxides surface morphology after 100 h of oxidation. Weight change kinetics revealed that the weight gain of the coating was 7.49 mg/cm2, while that of the substrate fluctuated because of oxide scale spallation. The nano-structured (Al2O3+Y2O3)/AlY coating improved the oxidation resistance of the γ-TiAl alloy at elevated temperature.

AB - Developing γ-TiAl intermetallic alloys as candidate materials for manufacturing components of aircraft gas turbines has been limited because of their poor oxidation resistance at high temperature. In this study, a nano-structured (Al2O3+Y2O3)/AlY coating was deposited on a γ-TiAl alloy by sputtering, to improve its oxidation resistance. To evaluate this coating under real-life critical operating conditions in aircraft engines, the isothermal oxidation exposure at an elevated temperature of 1200 °C was carried out. The analysis results indicated that Al and Y diffused through the grain boundary to synthesize or grow oxides outward, toward the testing atmosphere during the oxidation tests. During this process, oxygen was somewhat prevented from penetrating the coating because of the strong oxytropism of the coating surface to form Al and Y oxides. The coating exhibited a nanosized Al and Y oxides surface morphology after 100 h of oxidation. Weight change kinetics revealed that the weight gain of the coating was 7.49 mg/cm2, while that of the substrate fluctuated because of oxide scale spallation. The nano-structured (Al2O3+Y2O3)/AlY coating improved the oxidation resistance of the γ-TiAl alloy at elevated temperature.

KW - Grain growth

KW - Nano-structure

KW - Oxidation resistance

KW - Thermal application

UR - https://www.scopus.com/pages/publications/85057192706

U2 - 10.1016/j.ceramint.2018.11.142

DO - 10.1016/j.ceramint.2018.11.142

M3 - 文章

AN - SCOPUS:85057192706

SN - 0272-8842

VL - 45

SP - 5163

EP - 5167

JO - Ceramics International

JF - Ceramics International

IS - 4

ER -

Oxidation behavior of nano-structured (Al₂O₃+Y₂O₃)/AlY coating on γ-TiAl upon exposure to 1200 °C

Abstract

Keywords

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Oxidation behavior of nano-structured (Al2O3+Y2O3)/AlY coating on γ-TiAl upon exposure to 1200 °C

Abstract

Keywords

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Cite this

Oxidation behavior of nano-structured (Al₂O₃+Y₂O₃)/AlY coating on γ-TiAl upon exposure to 1200 °C