Abstract
The Nb–15Re–15Si–20Cr–15Ti alloy was subjected to 24 h of air exposure in a temperature range from 700 to 1,400 °C. The Re addition to the Nb–Si–Cr–Ti alloy has been found to control pesting at lower temperatures, and spalling at higher temperatures. Formation of Cr2Re3 phase is believed to help in the lowering the oxidation kinetics, thus reducing pesting and spalling. Addition of titanium improves the oxidation resistance by forming intermetallics such as (Nb,Ti)5Si3, NbCr2, and Cr2Re3. The weight gain/loss per unit area as a function of temperature is used to determine the oxidation resistance. Oxidation characterization was carried out using XRD and backscattered imaging, EDS, and x-ray mapping modes on the SEM.
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