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Processing of a low-cost γ–γ′ NiPtAl coating with improved oxidation resistance.
- Source :
- Rare Metals; Jun2024, Vol. 43 Issue 6, p2832-2841, 10p
- Publication Year :
- 2024
-
Abstract
- A novel γ–γ′ (Ni solid solution—Ni<subscript>3</subscript>Al) NiPtAl coating was produced on advanced single-crystal (SC) superalloy N5 by electroplating of a thin Pt coating with ~ 3 μm in thickness followed by heat treatment at 1000 °C in vacuum. For comparison, a traditional γ–γ′ NiPtAl coating was also produced by electroplating of a thick Pt coating with ~ 6 μm in thickness followed by heat treatment at 1100 °C in vacuum. The novel coating has a mass gain of ~ 0.5 mg·cm<superscript>−2</superscript> after 100 h 1-h cyclic oxidation at 1150 °C, showing better oxidation resistance than the traditional coating. An oxide scale mostly consisting of α-Al<subscript>2</subscript>O<subscript>3</subscript> grew on the novel coating because the element Cr from the SC alloy substrate contributes to the formation of α-Al<subscript>2</subscript>O<subscript>3</subscript>. Pt content in the novel coating has significant effect on the oxidation resistance. The optimized Pt content in the coating is about 16 at%, which is helpful to reduce the diffusion of harmful elements from the substrate into the coating but also to reduce the cost of the coating. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10010521
- Volume :
- 43
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Rare Metals
- Publication Type :
- Academic Journal
- Accession number :
- 176783096
- Full Text :
- https://doi.org/10.1007/s12598-018-1139-2