Investigation of Burning Aluminum in Oxygen-Enriched Atmospheres through Microanalysis Techniques

    Volume 1, Issue 8 (September 2004)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 30 August 2004

    Page Count: 13


    Suvorovs, T
    Postgraduate Students and Senior Lecturer, Division of Mechanical Engineering, The University of Queensland, St Lucia, QLD

    DeWit, JR
    Senior Engineer, Leslie Consulting Pty Ltd, Coopers Plains, QLD

    Osborne, BP
    Postgraduate Students and Senior Lecturer, Division of Mechanical Engineering, The University of Queensland, St Lucia, QLD

    Steinberg, TA
    Postgraduate Students and Senior Lecturer, Division of Mechanical Engineering, The University of Queensland, St Lucia, QLD

    (Received 9 December 2003; accepted 2 June 2004)

    Abstract

    Promoted-ignition testing of 3.2 mm diameter aluminum rods in high purity oxygen was performed. The rod and detached drops of both self-extinguished and water quenched samples were examined using scanning electron microscopy and electron probe microanalysis to analyze the physical structure of the sample and gather compositional data. A comparison of the micrographs of self-extinguished and quenched samples reveals clear differences in the extent of melted and re-solidified (unreacted) material and the thickness of the oxide layer, highlighting the effect of cooling rate on the burning system. A qualitative physical model for the burning of bulk aluminum in gaseous oxygen is presented. The model, incorporating a molten drop growth and detachment cycle, is based on an initial heterogeneous burning phase leading to a second phase of combined heterogeneous and homogeneous burning.


    Paper ID: JAI12340

    DOI: 10.1520/JAI12340

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    Title Investigation of Burning Aluminum in Oxygen-Enriched Atmospheres through Microanalysis Techniques
    Symposium , 0000-00-00
    Committee E42