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Ni-base superalloy powder-processed porous layer for gas cooling in extreme environments

TitleNi-base superalloy powder-processed porous layer for gas cooling in extreme environments
Publication TypeJournal Article
Year of Publication2016
AuthorsWhite, EMH, Heidloff, A, Byrd, D, Anderson, R, Anderson, IE
JournalPowder Metallurgy
Date Published06
Type of ArticleArticle; Proceedings Paper
ISBN Number0032-5899
Accession NumberWOS:000379224300003
KeywordsControlled porosity, Gas atomisation, Metallurgical Engineering, Ni-base superalloy, Powder processing, sintering

Extreme high temperature conditions demand novel solutions for hot gas filters and coolant access architectures, i.e., porous layers on exposed components. These high temperatures, for example in current turbine engines, are at or exceeding current material limits for high temperature oxidation/corrosion, creep resistance, and, even, melting temperature. Thus novel blade designs allowing greater heat removal are required to maintain airfoil temperatures below melting and/or rapid creep deformation limits. Gas atomised Ni-base superalloy powders were partially sintered into porous layers to allow full-surface, transpirational cooling of the surface of airfoils. These powder-processed porous layers were fully characterised for surface, morphology, cross-sectional microstructure, and mechanical strength characteristics. A sintering model based on pure Ni surface diffusion correlated well with the experimental results and allowed reasonable control over the partial sintering process to obtain a specified level of porosity within the porous layer.

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Short TitlePowder Metall.
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