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Open AccessArticle

Phosphor-Doped Thermal Barrier Coatings Deposited by Air Plasma Spray for In-Depth Temperature Sensing

by Di Peng 1,3, Lixia Yang 2,3, Tao Cai 1,3, Yingzheng Liu 1,3,*, Xiaofeng Zhao 2,3 and Zhiqi Yao 4
1
Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
2
School of Material Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
3
Gas Turbine Research Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
4
Corporate Technology, Siemens Ltd. China, 7 Wangjing Zhonghuan Nanlu, Beijing 100102, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ki-Hyun Kim
Sensors 2016, 16(10), 1490; https://doi.org/10.3390/s16101490
Received: 19 July 2016 / Revised: 28 August 2016 / Accepted: 29 August 2016 / Published: 28 September 2016
(This article belongs to the Special Issue The Use of New and/or Improved Materials for Sensing Applications)
Yttria-stabilized zirconia (YSZ)-based thermal barrier coating (TBC) has been integrated with thermographic phosphors through air plasma spray (APS) for in-depth; non-contact temperature sensing. This coating consisted of a thin layer of Dy-doped YSZ (about 40 µm) on the bottom and a regular YSZ layer with a thickness up to 300 µm on top. A measurement system has been established; which included a portable; low-cost diode laser (405 nm); a photo-multiplier tube (PMT) and the related optics. Coating samples with different topcoat thickness were calibrated in a high-temperature furnace from room temperature to around 900 °C. The results convincingly showed that the current sensor and the measurement system was capable of in-depth temperature sensing over 800 °C with a YSZ top layer up to 300 µm. The topcoat thickness was found to have a strong effect on the luminescent signal level. Therefore; the measurement accuracy at high temperatures was reduced for samples with thick topcoats due to strong light attenuation. However; it seemed that the light transmissivity of YSZ topcoat increased with temperature; which would improve the sensor’s performance at high temperatures. The current sensor and the measurement technology have shown great potential in on-line monitoring of TBC interface temperature. View Full-Text
Keywords: phosphor; thermal barrier coating; temperature sensing; air plasma spray phosphor; thermal barrier coating; temperature sensing; air plasma spray
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MDPI and ACS Style

Peng, D.; Yang, L.; Cai, T.; Liu, Y.; Zhao, X.; Yao, Z. Phosphor-Doped Thermal Barrier Coatings Deposited by Air Plasma Spray for In-Depth Temperature Sensing. Sensors 2016, 16, 1490.

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