Oxidation properties of self-propagating high temperature synthesized niobium disilicide
2014 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 85, 311-317 p.Article in journal (Refereed) Published
NbSi2 monoliths were prepared by self-propagating high temperature synthesis (SHS) and hot pressing (HP) and their oxidation behavior was investigated at various temperatures (823-1123 K) in air. The combustion mode of SHS reaction was steady state combustion, and the combustion product was single-phase NbSi2. Oxidation studies show that the highest mass gain was 0.95675 kg m(-2) at 1023 K. In cyclic oxidation, the oxidation rate was reduced and the mass gain was only 0.15507 kg m(-2). A dense protective amorphous SiO2 scale formed at 823 K and 923 K whereas a porous multilayer SiO2 and alpha/beta-Nb2O5 oxide scales formed at and above 1023 K and spalled off. Pest oxidation of NbSi2 monoliths was not observed in hot pressed NbSi2 monoliths.
Place, publisher, year, edition, pages
2014. Vol. 85, 311-317 p.
Intermetallics, X-ray diffraction, SEM, Oxidation, High temperature corrosion
IdentifiersURN: urn:nbn:se:su:diva-106310DOI: 10.1016/j.corsci.2014.04.029ISI: 000338388100035OAI: oai:DiVA.org:su-106310DiVA: diva2:736148