Evaluation of the in-depth temperature sensing performance of Eu- and Dy-doped YSZ in air plasma sprayed thermal barrier coatings

SURFACE & COATINGS TECHNOLOGY

卷:316

Article

Yang, Lixia^1,2  Peng, Di^1,3  Zhao, Chunshan^1,2  Xing, Chen^1,2  Guo, Fangwei^1,2  Yao, Zhiqi⁵  Liu, Yingzheng^1,3  Zhao, Xiaofeng^1,2  Xiao, Ping⁴ 

[1] Shanghai Jiao Tong Univ, Gas Turbine Res Inst, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China

[3] Shanghai Jiao Tong Univ, Sch Mech Engn, Key Lab, Educ Minist Power Machinery & Engn, Shanghai 200240, Peoples R China

[4] Univ Manchester, Sch Mat, Grosvenor St, Manchester M1 7HS, England

[5] Siemens Ltd China, Corp Technol, 7 Wangjing Zhonghuan Nanlu, Beijing 100102, Peoples R China

关键词: Thermal barrier coatings;    Temperature sensing;    Air plasma spray;    Luminescence;    Decay lifetime;    Signal-background-ratio;   

DOI  :  10.1016/j.surfcoat.2017.03.029

来源: Elsevier

【 摘 要 】

In-depth temperature sensing in air plasma sprayed (APS) thermal barrier coatings (TBCs) has been achieved with europium (Eu) and dysprosium (Dy) doped yttria stabilized zirconia (YSZ) sensor coatings. The luminescence properties of YSZ:Eu and YSZ:Dy, including spectrum, intensity and lifetime, were evaluated and their temperature sensing performances were compared using a lifetime-based measurement system. Both sensor TBCs display excellent temperature sensitivity in high temperature environment (400-800 degrees C for YSZ:Eu, 500-900 degrees C for YSZ:Dy) with a topcoat thickness up to 300 pm. It was found that the upper limit of temperature sensing was determined by the ratio between luminescence intensity and background thermal radiation (signal-background-ratio). YSZ:Dy showed higher luminescent intensity than YSZ:Eu at elevated temperatures, and therefore displayed better temperature sensing performance with an increased limit. The effect of topcoat thickness on the temperature sensing performance was also evaluated, showing that the attenuation factor of YSZ increased significantly with topcoat thickness. Interestingly, it was found that the topcoat attenuation factor gradually decreased as temperature increased, which improved the temperature sensing performance of sensor TBCs at elevated temperature. The findings in the temperature sensing of APS TBCs provide basis for the future development of on-line APS TBCs temperature monitoring technology. (C) 2017 Elsevier B.V. All rights reserved.

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