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MIM for HT turbine parts: Gas-atomized versus mechanically milled Nb-Si alloy powder

: Mulser, Marco; Hartwig, Thomas; Seemüller, Christoph; Heilmaier, Martin; Adkins, Nicholas; Wickins, Mick

European Powder Metallurgy Association -EPMA-:
World PM 2016 Congress & Exhibition. USB Proceedings : The Powder Metallurgy World Congress, Hamburg, 9.-13.10.2016
Shrewsbury: EPMA, 2016
ISBN: 978-1-899072-48-4
6 S.
Powder Metallurgy World Congress & Exhibition (PM) <2016, Hamburg>
Fraunhofer IFAM ()

Refractory-metal silicide composites feature good HT strength, corrosion resistance and offer the potential to replace Ni-based superalloys in HT applications. In this study, a Nb-Si based alloy was gas-atomized to develop MIM for turbine engine parts. The fraction of fine powder (<25 μm) was used directly for feedstock development. The fraction of coarser powder (45-106 μm) was subjected to mechanical milling to reduce the particle size and to increase the powder yield for MIM. Both powders were processed into complex-shaped MIM parts. The influence of the powder processing route on feedstock properties, green part quality, microstructure, residual porosity, oxygen content and mechanical properties at elevated temperatures was analysed. The results show that mechanically milled powders are a suitable alternative to directly gas-atomized powders revealing even better shape retention for the processed MIM parts.