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Laser deposited high temperature thin film sensors for gas turbines

Dongfang Yang (National Research Council Canada, Ottawa, Canada)
Vladimir Pankov (National Research Council Canada, Ottawa, Canada)
Linruo Zhao (National Research Council Canada, Ottawa, Canada)
Prakash Patnaik (National Research Council Canada, Ottawa, Canada)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 30 July 2019

Issue publication date: 13 January 2020

274

Abstract

Purpose

Accurate measurements of the temperature distributions in hot section components are indispensable for the prognostic and health management of gas turbines. Thin film thermocouple (TFTC) sensors, directly fabricated on the surface of a component, add negligible mass and create little or no disturbance to airflow, and therefore, can provide accurate measurements of fast temperature fluctuations of gas turbines. The purpose of this paper is to evaluate TFTC sensors fabricated by combining pulsed laser deposition (PLD) and micromachining techniques (LM).

Design/methodology/approach

The “dry” PLD/LM fabrication approach allows for excellent control of the chemical composition and physical characteristics of the constituent layers and their interfaces, thus achieving good adhesion of the layers to the substrate.

Findings

The results of thermal cyclic durability testing of the fabricated TFTC sensors demonstrated that the proposed PLD-based approach can be used to fabricate sensors that are fully functional at temperatures up to 750°C. Analyses of the sensor performance during durability testing revealed: the existence of a threshold temperature below which accurate temperature measurements were achieved; an abrupt drop in the sensor output occurring when the sensor temperature exceeded the threshold value, with a fast recovery of the sensor output once the temperature was reduced below the threshold level; and sensor “training” capable of increasing the threshold value of the TFTC through its exposure to above-the-threshold temperatures.

Originality/value

The work is the first time to demonstrate that simple PLD and LM processes can be used to fabricate TFTC that are fully functional at temperatures up to 750°C.

Keywords

Acknowledgements

The authors are indebted to Mr. Micro Zeman and Mr. Hugo Reshef of NRC-London for their technical support.

Citation

Yang, D., Pankov, V., Zhao, L. and Patnaik, P. (2019), "Laser deposited high temperature thin film sensors for gas turbines", Aircraft Engineering and Aerospace Technology, Vol. 92 No. 1, pp. 2-7. https://doi.org/10.1108/AEAT-11-2018-0292

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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