High temperature surface oxidation of metallic fibers for hot gas filtration

    Authors

    W. Fei; S. C. Kuiry; S. Seal; K. Scammon; N. Quick;M. June

    Abbreviated Journal Title

    Surf. Eng.

    Keywords

    CR-AL ALLOYS; ALUMINA SCALES; GROWTH-MECHANISM; ALPHA-AL2O3; DIFFUSION; ODS; Materials Science, Coatings & Films

    Abstract

    Metal hot gas filters made of Fe Cr-Al alloy fibre media have been developed to meet the increasingly stringent requirement for hot gas filtration. High temperature oxidation behaviour of Fe-Cr-Al alloy fibre media consisting of a random non-woven feltlike structure was studied at a temperature of 1255 K in dry air. Two types of Fe-Cr-Al alloys, namely Hoskins 875 and Fe-Cr-Al-Mo were used in the present study. The oxidation kinetics was found to follow the parabolic law for thick fibres (25 mum). The scale morphology and chemical composition were studied by SEM/EDAX. Focused ion beam (FIB) was used to investigate the scale cross-section. X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) studies confirmed that alumina scale forms on the surface of the Fe-Cr-Al alloy fibre media. Both fibres, 12 mum in diameter, showed short lifetimes at 1255 K. Fe-Cr Al-Mo was found to have more oxidation resistance than Hoskins 875 at 1255 K.

    Journal Title

    Surface Engineering

    Volume

    18

    Issue/Number

    3

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    197

    Last Page

    201

    WOS Identifier

    WOS:000177395800006

    ISSN

    0267-0844

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