A Comparison of Calculated Geometric Surface Area and Measured BET Surface Area for a Metal Powder

    Volume 25, Issue 4 (July 1997)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 5


    Schrøder-Pedersen, A
    Risø National Laboratory, Roskilde,

    Kjøller, J
    Risø National Laboratory, Roskilde,

    Larsen, B
    Risø National Laboratory, Roskilde,

    (Received 22 January 1996; accepted 9 December 1996)

    Abstract

    The specific surface areas of gas atomized (spherical) metal powder fractionated into 6 size fractions below 125 μm were determined by BET measurements and by geometric derivation from particle size distributions. The areas obtained were compared and a linear correlation was found. Even though the total areas measured were relatively low, in the range of 0.3 m2, the BET measurements followed the areas derived from particle size with a proportionality factor around 1.8. It was concluded that BET surface area measurements represent true area closely, when true area is understood as the envelope best fitting the powder particles. The deviation of the BET measurements from the true area is concluded to be less than 20%, with increasing accuracy for increasing specific surface area.


    Paper ID: JTE11871J

    DOI: 10.1520/JTE11871J

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    Title A Comparison of Calculated Geometric Surface Area and Measured BET Surface Area for a Metal Powder
    Symposium , 0000-00-00
    Committee E12