Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 14, Issue 3, Pages 315-320Publisher
SPRINGER
DOI: 10.1361/105996305X59396
Keywords
coating; Ni-Co-Cr-Al-Y; oxidation; rhenium; tantalum
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A high-velocity oxyfuel-sprayed 30 wt.% Ni-20 wt.% Co-30 wt.% Cr-10 wt.% Al-2 wt% Y4 wt.% Re-4 wt.% Ta coating was oxidized between 1000 and 1200 degrees C for up to 200 h in air, and the oxide scales were examined. The dense, sprayed coating consisted mainly of Cr3Ni2, Ni3Al, Ni3Ta, Ni, NiO, Al5Y3O12, and Cr2O3. Intermetallics and some oxides formed during spraying. During oxidation, mainly alpha Al2O3, along with some Al5Y3O12, CoAl2O4, CoCr2O4, Ta2O5, and Ta2O2.2 formed on the coating. The preferential oxidation of Al to form the Al-rich scales resulted in the formation of an Al-depleted region beneath the scales. Rhenium, being the most noble element, was distributed throughout the oxide scale and the coating, without forming any independent oxides.
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