High-temperature oxidation behavior of plasma-sprayed NiCrAlY/TiO2 and NiCrAlY/Cr2O3/YSZ coatings on titanium alloy

The 70% NiCrAlY + 30% TiO 2 and 70% NiCrAlY + 25% Cr 2 O 3  + 5% YSZ metallic coatings are sprayed on titanium-15 alloy of ASTM B338, Grade 2, by using the plasma spray coating technology. Cyclic oxidation studies are conducted on the uncoated and coated alloys at 700 °C under static air environment...

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Bibliographic Details
Published inWelding in the world Vol. 66; no. 6; pp. 1069 - 1079
Main Authors Reddy, G. Madhu Sudana, Prasad, C. Durga, Shetty, Gagan, Ramesh, M. R., Rao, T. Nageswara, Patil, Pradeep
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2022
Subjects
Chemistry and Materials Science
Materials Science
Metallic Materials
Research Paper
Solid Mechanics
Theoretical and Applied Mechanics
Titanium alloy
YSZ
NiCrAlY/TiO
NiCrAlY/Cr
Oxidation
Plasma spray coatings
O
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Summary:The 70% NiCrAlY + 30% TiO 2 and 70% NiCrAlY + 25% Cr 2 O 3  + 5% YSZ metallic coatings are sprayed on titanium-15 alloy of ASTM B338, Grade 2, by using the plasma spray coating technology. Cyclic oxidation studies are conducted on the uncoated and coated alloys at 700 °C under static air environment. The kinetics of oxidation is studied by using the thermo-gravimetric method. Phase, microstructural, and chemical analysis tests are performed on as-sprayed and oxidized coatings. The coated alloys are found to be more resistant when compared to the uncoated alloys. The NiCrAlY + Cr 2 O 3  + YSZ coating is found to be more protective when compared to NiCrAlY + TiO 2 coating. It is concluded that the formation of Cr 2 O 3 , NiCr 2 O 4 , and Al 2 O 3 is attributed to the development of oxidation resistance in the coatings.
ISSN:0043-2288
1878-6669
DOI:10.1007/s40194-022-01268-7