Comparison of microstructure and oxidation behavior between Pt-free and Pt-modified δ-Ni 2 Si coatings on Ni-based superalloys
Source abstract
Abstract
Abstract This study investigated the microstructure and oxidation behavior of Pt-free and Pt-modified δ-Ni 2 Si coatings prepared by codeposition of Al and Si. The composition (in wt.%) of packs was 1Al–4NH 4 Cl– x Si-(95 − x )Al 2 O 3 with different Si levels ( x = 4, 6, 8, 10). Pt promotes uphill diffusion of Al in Pt-modified coatings while Cr tends to outward diffuse into Pt-free coatings. The isothermal oxidation tests indicated the coating with 10 wt.% Si had good oxidation performance. After oxidation, the microstructure of Pt-modified coatings was Cr 2 NiO 4 + NiO or Cr 2 NiO 4 + NiO + Al 2 O 3 while that of Pt-free coatings was Cr 2 O 3 + Ni 31 Si 12 + Al 2 O 3 .
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Intermetallics and Advanced Alloy Properties · High Entropy Alloys Studies
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