Abstract
NbSi2 monoliths were prepared by self-propagating high temperature synthesis (SHS) and hot pressing (HP) and their oxidation behavior was investigated at various temperatures (823–1123K) 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 0.95675kgm−2 at 1023K. In cyclic oxidation, the oxidation rate was reduced and the mass gain was only 0.15507kgm−2. A dense protective amorphous SiO2 scale formed at 823K and 923K whereas a porous multilayer SiO2 and α/β-Nb2O5 oxide scales formed at and above 1023K and spalled off. Pest oxidation of NbSi2 monoliths was not observed in hot pressed NbSi2 monoliths.
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