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Time-Resolved X-ray Diffraction Study of Solid Combustion Reactions.

J Wong, E M Larson, J B Holt

    Science (New York, N.Y.)
    |September 21, 1990
    PubMed
    Summary
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    Real-time synchrotron diffraction captured fast combustion reactions. This method tracks rapid phase transformations in materials like TiC and AlNi, offering insights into high-temperature chemical dynamics.

    Area of Science:

    • Materials Science
    • Chemical Engineering
    • Physical Chemistry

    Background:

    • Solid combustion reactions are highly exothermic and rapid.
    • Understanding their phase transformations is crucial for materials development.
    • Previous methods lacked the temporal resolution to capture these fast processes.

    Purpose of the Study:

    • To apply real-time synchrotron diffraction to monitor phase transformations during fast combustion reactions.
    • To investigate the chemical dynamics of exothermic reactions on millisecond timescales.
    • To provide experimental data for validating combustion models.

    Main Methods:

    • Utilized real-time synchrotron diffraction.
    • Investigated three combustion systems: Ti+C, Ti+C+Ni, and Al+Ni.

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  • Achieved time resolutions down to 10 milliseconds.

    • Main Results:

    • Observed melting of metal reactants as the initial step in all reactions.
    • TiC formation completed within 400 ms during combustion wave propagation.
    • AlNi reaction showed intermediates and a delayed phase transformation to an ordered CsCl structure.

    Conclusions:

    • Real-time synchrotron diffraction is effective for studying fast solid combustion dynamics.
    • Combustion wave front plays a key role in TiC formation.
    • The Al+Ni reaction exhibits complex intermediate phases and delayed ordering.