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Open AccessFeature PaperArticle

Perspectives on Thermal Gradients in Porous ZrO2-7–8 wt.% Y2O3 (YSZ) Thermal Barrier Coatings (TBCs) Manufactured by Air Plasma Spray (APS)

National Research Council of Canada (NRC), Boucherville, QC J4B 6Y4, Canada
Coatings 2020, 10(9), 812; https://doi.org/10.3390/coatings10090812
Received: 4 August 2020 / Revised: 19 August 2020 / Accepted: 20 August 2020 / Published: 22 August 2020
(This article belongs to the Special Issue Recent Developments of Thermal Barrier Coatings)
Porous (~10–20%) ZrO2-7–8 wt.% Y2O3 (YSZ) thermal barrier coatings (TBCs) manufactured via air plasma spray (APS) and exhibiting a thickness range of ~250–500 µm, provide thermal insulation from the hot combustion gases to the metallic parts located in the hot stationary sections of gas turbine engines (e.g., combustion chambers of aerospace turbines). The objective of this paper was to measure and report the thermal gradient values in a benchmark porous (~15%) APS YSZ TBC, working within the known acceptable maximum temperature envelop conditions of a TBC/substrate system, i.e., T-ysz ~1300 °C and T-sub ~1000 °C. In order to accomplish this objective, the following steps were performed. A benchmark APS YSZ TBC exhibiting two distinct thicknesses (~260 and ~460 µm) was manufactured. In addition, a thermal gradient laser-rig was employed to generate a temperature drop (ΔT) along the coated coupon, with the target operate within the acceptable maximum temperature capabilities of this type of TBC/substrate architecture. This target was achieved, i.e., T-ysz values were not higher than ~1300 °C while the substrate temperatures did not reach values above ~1000 °C. The ΔTs for the ~260 and ~460 µm YSZ TBCs were ~280 and ~465 °C, respectively. The thermal gradient value for both YSZ TBCs was ~0.90 °C/µm, which falls within those reported in the literature for porous APS YSZ TBCs. View Full-Text
Keywords: thermal barrier coatings (TBCs); ZrO2-7–8 wt.% Y2O3 (YSZ); air plasma spray (APS); thermal gradients; laser-rig thermal barrier coatings (TBCs); ZrO2-7–8 wt.% Y2O3 (YSZ); air plasma spray (APS); thermal gradients; laser-rig
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MDPI and ACS Style

Lima, R.S. Perspectives on Thermal Gradients in Porous ZrO2-7–8 wt.% Y2O3 (YSZ) Thermal Barrier Coatings (TBCs) Manufactured by Air Plasma Spray (APS). Coatings 2020, 10, 812. https://doi.org/10.3390/coatings10090812

AMA Style

Lima RS. Perspectives on Thermal Gradients in Porous ZrO2-7–8 wt.% Y2O3 (YSZ) Thermal Barrier Coatings (TBCs) Manufactured by Air Plasma Spray (APS). Coatings. 2020; 10(9):812. https://doi.org/10.3390/coatings10090812

Chicago/Turabian Style

Lima, Rogerio S. 2020. "Perspectives on Thermal Gradients in Porous ZrO2-7–8 wt.% Y2O3 (YSZ) Thermal Barrier Coatings (TBCs) Manufactured by Air Plasma Spray (APS)" Coatings 10, no. 9: 812. https://doi.org/10.3390/coatings10090812

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