Abstract
We report the chemical analysis of 47Nb 16Si 25Ti 8Hf 2Al 2Cr alloy sheet exposed in static air at 1200°C for 150, 300, 450, 600 and 900 seconds. This alloy exhibits linear oxidation kinetics. The dendritic phase M5Si3 (with M=Hf and Ti) is observed to be not oxidised rapidly compared to the (Nb,Ti)ss, due to low oxygen solubility. Distribution of elements in the cross section of the oxide scales was analysed by energy-dispersive X-ray spectrometry and mapping in a scanning electron microscope. TiNb2O7 and Nb2O5 have been detected by X-ray diffraction. In addition, Fourier-transform IR spectroscopy showed absorbance peaks which are a clear signature of the formation of Si—O—Si, Si—O—Ti, and Si—O—Hf bonding in the oxidation layer. This analysis suggests that the film contains also amorphous silicates, not detected with X-ray diffraction.
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