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Strontium Zirconate TBC Sprayed by a High Feed-Rate Water-Stabilized Plasma Torch

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A novel thermal barrier coating (TBC) material, strontium zirconate SrZrO3, was sprayed by a high feed-rate water-stabilized plasma torch WSP 500. Stainless steel coupons were used as substrates. Coatings with a thickness of about 1.2 mm were produced, whereas the substrates were preheated over 450 °C. The torch worked at 150 kW power and was able to spray SrZrO3 with a high spray rate over 10 kg per hour. Microstructure and microhardness, phase composition, adhesion, thermal conductivity and thermal expansion were evaluated. The coating has low thermal conductivity under 1 W/m K in the interval from room temperature up to 1200 °C. Its crystallite size is slightly over 400 nm and thermal expansion 12.3 µm K−1 in the similar temperature range.

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The research was sponsored by the Technology agency of the Czech Republic under Project CVPU—TE02000011.

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Correspondence to P. Ctibor.

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Ctibor, P., Nevrla, B., Cizek, J. et al. Strontium Zirconate TBC Sprayed by a High Feed-Rate Water-Stabilized Plasma Torch. J Therm Spray Tech 26, 1804–1809 (2017).

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