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The high-temperature oxidation characteristics of alloys from the Nb-W-Cr system with C additions

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Abstract

The oxidation behavior of two alloys from the Nb-W-Cr system containing carbon has been studied. Selection of specific alloy compositions was based on the ternary isothermal sections of Nb-W-Cr at 1,000°C and 1,500°C. Oxidation experiments were conducted for 24 hours in air over a range of temperatures from 700°C to 1,400°C. Mass gain per unit area as a function of the temperature was used to determine the alloy’s oxidation resistance and the oxidation products were characterized by scanning electron microscopy/energy dispersive x-ray spectroscopy, and x-ray diffraction (XRD). The results have been compared with a previous study of the oxidation resistance of the alloys in the monolithic form. Beneficial effects have been observed when carbon is added to Nb-20W-5Cr alloy; however, the oxidation resistance of the alloy with higher chromium content was not improved by the addition of the modifier. The nature of oxides obtained from alloys with and without carbon additions has been observed to be similar based on the XRD results.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, The University of Texas at El Paso, El Paso, TX, 79968-0520, USA

    Maria D. Moricca & S. K. Varma

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  1. Maria D. Moricca
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  2. S. K. Varma
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Correspondence to S. K. Varma.

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Moricca, M.D., Varma, S.K. The high-temperature oxidation characteristics of alloys from the Nb-W-Cr system with C additions. JOM 60, 66–69 (2008). https://doi.org/10.1007/s11837-008-0093-0

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