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High temperature oxidation of tungsten wires in O2-Ar mixtures

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Abstract

The rate of volatilization of tungsten wires in natural convection by high temperature oxidation was measured in O2-Ar mixtures containing between 20 and 150 ppm O2 at 0.789 atm total pressure. At constant oxygen partial pressure the rate generally decreases with increasing temperature between 2450 and 3200 K. The magnitude of the rate ranges between 1.2×10−6 and 1.7×10−5 g/cm2−s, depending on temperature and oxygen partial pressure. The oxidation reaction is gas-transport controlled as demonstrated by supplemental measurement in helium oxygen mixtures, by experiments in 0.395 atm of argon, and by comparison with previous measurements on surface-controlled oxidation of tungsten. The experimental results are in reasonable agreement with a volatile oxide counter diffusion model.

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Authors and Affiliations

  1. Westinghouse Research Laboratories, 15235, Pittsburgh, Pa.

    F. J. Harvey (Senior Scientist)

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  1. F. J. Harvey
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Harvey, F.J. High temperature oxidation of tungsten wires in O2-Ar mixtures. Metall Trans 4, 1513–1517 (1973). https://doi.org/10.1007/BF02668002

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  • DOI: https://doi.org/10.1007/BF02668002

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