Microstructures and Thermal Cycling Properties of Thermal Barrier Coatings Deposited by Hybrid Water-Stabilized Plasma Torch

0531744 - ÚFP 2021 RIV US eng J - Článek v odborném periodiku
Mušálek, Radek - Tesař, Tomáš - Medřický, Jan - Lukáč, František - Chráska, Tomáš - Gupta, M.
Microstructures and Thermal Cycling Properties of Thermal Barrier Coatings Deposited by Hybrid Water-Stabilized Plasma Torch.
Journal of Thermal Spray Technology. Roč. 29, č. 3 (2020), s. 444-461. ISSN 1059-9630. E-ISSN 1544-1016
Institucionální podpora: RVO:61389021
Klíčová slova: hybrid plasma torch * solution precursor spraying * suspension spraying * thermal barrier coatings (TBCs) * thermal cycling * water-stabilized plasma * yttria-stabilized zirconia (YSZ)
Obor OECD: Chemical process engineering
Impakt faktor: 2.757, rok: 2020
Způsob publikování: Omezený přístup
https://link.springer.com/article/10.1007/s11666-020-00990-2

Hybrid water-stabilized plasma (WSP-H) torches provide high-enthalpy plasma which may be utilized for high-throughput and yet economical spraying of coatings from powders, suspensions, and solutions. It was previously demonstrated that microstructures and functional properties of the WSP-H coatings may be tailored to a wide extent for new applications, namely those requiring high coating thickness and/or coating of large components. In this study, applicability potential of WSP-H technology for spraying of novel thermal barrier coatings (TBCs) is demonstrated. WSP-H technology was used for spraying of yttria-stabilized zirconia (YSZ) top-coats from powder, suspension, and solution. Yttria content in the top-coat feedstock was 7-8 wt.%. In addition, gadolinium zirconate (Gd2Zr2O7-GZO) was sprayed from suspension for comparison. NiCrAlY bond-coat was also deposited by WSP-H, and Hastelloy-X alloy was used as substrate material. Microstructure, phase composition, and endurance of the deposited coatings in thermal cycling fatigue (TCF) test and during high-temperature short-term annealing were evaluated. All coatings showed excellent high-temperature stability and TCF resistance withstanding more than 650 cycles, surpassing some of the currently commercially used TBCs. Lifetime of the TBC with columnar top-coat deposited from YSZ suspension exceeded even more than 900 cycles.
Trvalý link: http://hdl.handle.net/11104/0310365