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Physical chemistry of the powder metallurgy of beryllium: Chemical characterization of the powder in relation to its granularity

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Abstract

Combining the systematic quantitative chemical analysis of the light impurities H, C, N, and O, the quantitative thermal desorption of molecular H2O and H2, and X ray diffractometry of various size fractions of a commercial Be powder (SP-65 grade from Brush-Wellman) allowed the precise de-termination of the mean composition and equivalent mean thickness of the surface impurity phases in the passivation-contamination layer on the surface of the particles. The overall surface stoichi-ometry is as follows: 0.2 BeOcrystallized, 0.8 [BeO - 0.59 H2O]amorphous, 0.14 H2Oads The result of the elemental analysis by X-ray photoelectron spectroscopy of the unetched surface of a powder pellet is compared. Analysis of the metallic impurities reveals increased concentrations of Mg, Ca, Ti, and Cr in the finest fraction, presumably due to the liberation of fine particles of intermetallic phases by attrition.

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Authors and Affiliations

  1. Laboratory for the Reactivity of Solids associated with the CNRS, University of Burgundy, 21004, Dijon, France

    Pierre Bracconi (CNRS Research Assistant)

  2. University of Burgundy, 21004, Dijon, France

    Laurent Buisson (Engineer)

  3. Atomic Energy Board, CEA, 21120, Valduc, France

    Christian Bonnet (R & D Manager)

Authors
  1. Pierre Bracconi
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  2. Laurent Buisson
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  3. Christian Bonnet
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Formerly Doctorate Student, Laboratory for the Reactivity of Solids.

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Bracconi, P., Buisson, L. & Bonnet, C. Physical chemistry of the powder metallurgy of beryllium: Chemical characterization of the powder in relation to its granularity. Metall Mater Trans A 27, 371–379 (1996). https://doi.org/10.1007/BF02648414

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