Thermal gradient behaviour of TBCs subjected to a laser gradient test rig: simulating an air-to-air combat flight

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Proceedings titleProceedings of the International Thermal Spray Conference
ConferenceInternational Thermal Spray Conference and Exposition, May 11-14,2015, Long Beach, CA, USA
AbstractA computer-controlled laser test rig (using a CO2 laser) offers an interesting alternative to traditional flame-based thermal gradient rigs in evaluating thermal barrier coatings (TBCs). The temperature gradient between the top and back surfaces of a TBC system can be controlled based on the laser power and a forced air back-face cooling system, enabling the temperature history of complete aircraft missions to be simulated. An air plasma spray (APS) deposited TBC was tested and, based on experimental data available in the literature, the temperature gradients across the TBC system (ZrO2-Y2O3 YSZ top coat / CoNiCrAlY bond coat / Inconel 625 substrate) and their respective frequencies during air-to- Air combat missions of fighter jets were replicated. The missions included (i) idle/taxi on the runway, (ii) take-off and climbing, (iii) cruise trajectory to rendezvous zone, (iv) air-to- Air combat maneuvering, (v) cruise trajectory back to runway and (vi) idle/taxi after landing. The results show that the TBC thermal gradient experimental data in turbine engines can be replicated in the laser gradient rig, leading to an important tool to better engineer TBCs.
Publication date
PublisherASM International
AffiliationNational Research Council Canada; Automotive and Surface Transportation; NRC Industrial Materials Institute
Peer reviewedYes
NPARC number23000273
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Record identifier03823a2f-863d-4c91-9098-f10b46592a71
Record created2016-06-30
Record modified2016-06-30
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