caa a22 4500 445844132 CHVBK 20180317145353.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s11085-011-9256-4 doi (NATIONALLICENCE)springer-10.1007/s11085-011-9256-4 Influence of Hafnium Additions and Preoxidation Treatment on the Metal Dusting of Ni-Al Alloys [Elektronische Daten] [P. Speck, D. Young] Alloys of γ-Ni(Al), γ-γ′ Ni(Al), γ′-Ni3Al and β-NiAl, each containing 0.5wt% hafnium, were exposed in 1h cycles to a carbon supersaturated CO-H2-H2O atmosphere (a C=36.7, $$ p_{{{\text{O}}_{2} }}$$=2.83×10−26atm) at 650°C and an overall pressure of 1atm. The alloys accumulated surface coke deposits and, to varying degrees, underwent metal dusting. While morphologies of the reacted samples were found to be very similar to those of equivalent hafnium-free alloys, the weight uptake kinetics were faster for alloys containing 0.5wt% Hf. The hafnium-containing alloys were preoxidised in a H2-H2O mixture at 1,100°C to form α-Al2O3 prior to metal dusting exposure. This treatment led to external oxide formation on all alloys except the low Al γ-Ni(Al) alloy, which formed internal oxides. Cyclic metal dusting resistance of all alloys was improved significantly by the preoxidation treatment, as alumina forms a barrier to inward carbon diffusion, and hafnium improves the quality of the barrier oxide. Springer Science+Business Media, LLC, 2011 Metal dusting nationallicence Nickel nationallicence Aluminium nationallicence Hafnium nationallicence Oxidation nationallicence Alumina nationallicence Reactive element effect nationallicence Catalysis nationallicence Speck P. School of Materials Science and Engineering, The University of New South Wales, 2052, Sydney, NSW, Australia aut Young D. School of Materials Science and Engineering, The University of New South Wales, 2052, Sydney, NSW, Australia aut Oxidation of Metals Springer-Verlag 76/3-4(2011-10-01), 287-305 0030-770X 76:3-4<287 2011 76 11085 https://doi.org/10.1007/s11085-011-9256-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11085-011-9256-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Speck P. School of Materials Science and Engineering, The University of New South Wales, 2052, Sydney, NSW, Australia aut NATIONALLICENCE 700 1- Young D. School of Materials Science and Engineering, The University of New South Wales, 2052, Sydney, NSW, Australia aut NATIONALLICENCE 773 0- Oxidation of Metals Springer-Verlag 76/3-4(2011-10-01), 287-305 0030-770X 76:3-4<287 2011 76 11085 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer