MgF2 was investigated as a phase-change energy-storage material for LEO power systems using solar heat to run thermal cycles. It provides a high heat of fusion per unit mass at a high melting point (1536 K). Theoretical evaluation showed the basic chemical compatibility of liquid MgF2 with refractory metals at 1600 K, though transient high pressures of H2 can occur in a closed container due to reaction with residual moisture. The compatibility was tested in two refractory metal containers for over 2000 h. Some showed no deterioration, while there was evidence that the fluoride reacted with hafnium in others. Corollary tests showed that the MgF2 supercooled by 10-30 K and 50-90 K.


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    Title :

    Magnesium fluoride as energy storage medium for spacecraft solar thermal power systems


    Contributors:

    Published in:

    Publication date :

    1992-10-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English





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