![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
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.
Acknowledgements
The authors would like to thank Carpenter Technology Corporation for provision of the initial IN-738 powder for this work. Aaron Kassen assisted with furnace operation and the Center for Industrial Research & Service at Iowa State University allowed our use of their equipment for mechanical testing. We acknowledge Richard Dennis and Patcharin Burke at DOE NETL for their support and Maryanne Alvin for her careful technical project guidance. Collaborative efforts are being performed under the NETL-Regional University Alliance (RUA) Contract DE-FE-0004000.3.622.053.001 through Field Work Proposal Number 2013.03.02. Supported by NETL ORD FWP-2012.03.02 and DOE-OS-DMSE through Ames Lab (contract number DE-AC02-07CH11358).
ORCID
E. M. H. White http://orcid.org/0000-0002-0246-6256
I. Anderson http://orcid.org/0000-0001-7349-7597