Abstract
The relationship between the mechanical properties of plasma-sprayed thermal-barrier coatings and the properties of feedstock powders is studied. These powders have the same chemical composition and are obtained by hydroxide coprecipitation followed by air-drying and by a cryochemical method. Information on TBC failure mechanisms is used to pose and solve the problem of increasing the plasticity and, consequently, the stress relaxation coefficient of the ceramic coating. The finer structure of the cryochemical powder sprayed coating also improves its crack-resistance. The minor reduction in the hardness of the cryopowder-sprayed coating should not deteriorate the performance of the thermal-barrier coating.
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Translated from Poroshkovaya Metallurgiya, Vol. 47, No. 7–8 (462), pp. 126–131, 2008.
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Oliker, V.Y., Pritulyak, A.A., Gorban’, V.F. et al. Mechanical-indentation analysis of the microstructure and properties of plasma-sprayed ZrO2-based coatings. Powder Metall Met Ceram 47, 477–481 (2008). https://doi.org/10.1007/s11106-008-9047-x
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DOI: https://doi.org/10.1007/s11106-008-9047-x