Tungsten carbide is more oxidation resistant than tungsten when processed to full density

SCRIPTA MATERIALIA

卷:116

Article

Humphry-Baker, Samuel A.¹  Lee, William E.¹ 

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, Prince Consort Rd, London SW7 2BP, England

关键词: Tungsten carbide;    Tungsten;    Oxidation;    Kinetics;    Porosity;   

DOI  :  10.1016/j.scriptamat.2016.01.007

来源: Elsevier

【 摘 要 】

Previous studies report that WC oxidises in air more readily than W. However, systematic thermogravimetric studies reveal considerably slower oxidation kinetics in WC samples, which outperform previous measurements by 1-2 orders of magnitude. By combining X-ray diffraction and electron microscopy, the enhanced stability in WC is explained by a dense interlayer of sub-stoichiometric WO3, approximately 10 pm in thickness, which forms adjacent to the substrate/oxide interface. The faster oxidation kinetics from previous studies are explained by the comparatively low densities of samples used. (C) 2016 Elsevier Ltd.

【 授权许可】

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