Lakshmi, PG and Majithia, Sumil and Shwetha, V and Balaji, N and Aruna, ST (2019) Improved hot corrosion resistance of plasma sprayed YSZ/Gd2Zr2O7 thermal barrier coating over single layer YSZ. Materials Characterization, 147. pp. 199-206. ISSN 1044-5803
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Abstract
In recent years, research is focused on the development of rare earth zirconates based thermal barrier coatings (TBC). In the present study, bilayered 8 wt% yttria stabilized zirconia (YSZ)/gadolinium zirconate (GZO) TBC system has been developed by atmospheric plasma spraying (APS) process from powders prepared by a single step co-precipitation technique. Hot corrosion behavior of all the coatings are tested in fused Na2SO4+ V2O5 mixture at the concentration of approximately 25 mg/cm2 at 910 °C for 30 h. Formation of gadolinium vanadate (GdVO4) is observed to be the corrosion product in YSZ/GZO bilayer coatings from Energy Dispersive X-ray analysis (EDAX) and is further confirmed by X-ray diffractometry (XRD) analysis. FESEM cross-section analysis of the YSZ/GZO bilayer coating after corrosion test affirms the effectiveness of the bilayer design in preventing the penetration of corrosive salts to the YSZ layer. Also, YSZ/GZO bilayer TBC exhibited a higher thermal cyclic life (300 cycles) than the single layer 8YSZ (175 cycles) coatings at 1100 °C.
| Item Type: | Article |
|---|---|
| Subjects: | RENEWABLE ENERGY > Thermal Energy CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Metals and Metallic Materials |
| Depositing User: | Mrs SK Pratibha |
| Date Deposited: | 23 Nov 2021 11:43 |
| Last Modified: | 23 Nov 2021 11:43 |
| URI: | http://nal-ir.nal.res.in/id/eprint/13323 |
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