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

Journal Article · Thu May 26 00:00:00 EDT 2016 · Powder Metallurgy

DOI:https://doi.org/10.1080/00325899.2015.1138022· OSTI ID:1278742

White, Emma M. H. ^[1]; Heidloff, Andrew J. ^[1]; Byrd, David J. ^[1]; Anderson, Ross D. ^[1]; Anderson, Iver E. ^[1]

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1. Ames Lab., Ames, IA (United States)

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 atomized Ni-base superalloy powders were partially sintered into porous layers to allow full-surface, transpirational cooling of the surface of airfoils. Furthermore, these powder-processed porous layers were fully characterized 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.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-07CH11358; FWP-2012.03.02; FE-0004000.3.622.053.001
• OSTI ID: 1278742
• Report Number(s): IS-J-8808
• Journal Information: Powder Metallurgy, Vol. 59, Issue 3; ISSN 0032-5899
• Publisher: Taylor & Francis
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
gas atomization
powder processing
sintering
controlled porosity
Ni-base superalloy