Abstract
Nb-20Mo-15Si-5B-20Cr (Cr alloy) and Nb-20Mo-15Si-5B-20Ti (Ti alloy) alloys have been subjected to oxidation in air for 24 hours in a range of temperatures from 700 to 1300{degree sign}C. As cast structures contain Nbss, Nb5Si3, and Nb3Si in both alloys but Cr alloy also contains NbCr2. Cr alloy exhibits better oxidation resistance than Ti alloy. Oxidation characterization has been carried out for samples heated in 700-1300{degree sign}C temperature range. Large number of oxides of Nb, Mo, Si, Cr, and Ti has been observed as characterized by XRD, x-ray mapping, and EDS on SEM. The scale in immediate contact with the alloy substrate has been found to usually contain Mo oxides. Swollen oxide/metal mixture appears at 900, 1200 and 1300{degree sign}C for Ti alloys and between 1100 and 1300{degree sign}C for Cr alloy.
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