Short-term oxidation response of Nb–15Re–15Si–10Cr–20Mo alloy

Abstract

The Nb–15Re–15Si–10Cr–20Mo alloy was subjected to 24h of air exposure in a temperature range from 700 to 1400°C. Re addition to the Nb–Si–Cr–Mo alloy has been found to control the pesting at lower temperatures and spalling at higher temperatures. The curve in a graph of weight gain per unit area as a function of temperature was used to determine the oxidation resistance. Re2Si formation around a solid solution phase reduces the infusion of oxygen into the metal, controlling the kinetics of the alloy system. Oxidation characterization was carried out using XRD and back scattered imaging, EDS, and X-ray mapping modes on the SEM. Mo addition promotes the formation of oxidation resistance Nb5Si3.