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Nb-Si intermetallic composites for high-temperature applications produced by MIM

Intermetallische Nb-Si-Verbundwerkstoffe für Hochtemperaturanwendungen hergestellt durch pulvermetallurgisches Spritzgießen
: Mulser, Marco; Hartwig, Thomas; Seemüller, Christoph; Heilmaier, Martin; Adkins, N.; Wickins, M.

Postprint urn:nbn:de:0011-n-2906571 (546 KByte PDF)
MD5 Fingerprint: 008562e4ced9a969b7ad0f9a4d759faf
Created on: 21.2.2015

European Powder Metallurgy Association -EPMA-:
Euro PM2013 Congress & Exhibition. Vol. 1: Cermets and ceramics, diamond tools, hardmetals, hot isostatic pressing, powder injection moulding, superalloys and refractory metals : 15 - 18 September 2013, Gothenburg, Sweden
Shrewsbury: EPMA, 2013
ISBN: 978-1-899072-41-5
ISBN: 978-1-899072-40-8 (CD-ROM)
International Powder Metallurgy Congress and Exhibition (Euro PM) <2013, Gothenburg>
European Commission EC
Conference Paper, Electronic Publication
Fraunhofer IFAM ()

Refractory alloys such as Nb-Si intermetallic composites exhibit low density and high strength above the operating temperature of currently applied nickel-based superalloys. Due to these advantageous properties they offer a potential to replace superalloys in structural components for high-temperature applications, such as aircraft or land-based turbines. In this study, gas atomised powder as well as high-energy mechanically alloyed powder of the recently developed alloy composition Nb-20Si-23Ti-6Al-3Cr-4Hf (at%) was produced to evaluate the feasibility for processing by MIM. A feedstock consisting of a wax-polymer based binder was successfully moulded into simple shapes. Sintering at 1500 °C for 3 hours at high vacuum showed promising results for the fine powder fraction of gas atomised powder concerning residual porosity, homogeneity of the multiphase microstructure and interstitial elements contamination. Compared to other processing technologies, the processed MIM samples reveal a very fine-grained microstructure with more homogeneously distributed silicide particles.