Advertisement

Journal of Materials Science

, Volume 21, Issue 6, pp 2033–2042 | Cite as

Dependence of oxidation rate of WC powder on particle size

  • B. Roebuck
  • E. G. Bennett
  • E. A. Almond
  • M. G. Gee
Papers

Abstract

Isothermal oxidation experiments on WC powders revealed a systematic dependence of oxidation rate on powder particle size. Oxidation was followed by measuring the change in mass of the WC powder as WC is converted to WO3. Fine powders oxidized more quickly than coarse powders because for the same initial mass the fine powder had a larger surface area. Measurement of the change in mass with time were shown to resolve differences in mean size of 0.1 μm, and possibly less, between separate batches of powder. A theoretical expression for the change in mass with time of spherical particles has been derived which compares well with experimental measurements and which can also be used with appropriate assumptions to calculate the initial powder-size distribution.

Keywords

Oxidation Polymer Particle Size Experimental Measurement Spherical Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    L-C. Dufour and J. Simon, Bull. Soc. Chem. France 9 (1969) 3643.Google Scholar
  2. 2.
    A. Gimelfarb and A. N. Zelikman, Tsvetnaya Met. 10 (1967) 63.Google Scholar
  3. 3.
    K. Suzuki, T. Fujiwara and S. Usui, J. Jpn. Soc. Powder Metall. 23 (1976) 211.Google Scholar
  4. 4.
    R. Kieffer and F. Kolbl, Z. Anor. Chem. 262 (1950) 229.Google Scholar
  5. 5.
    W. W. Webb, J. T. Norton and C. Wagner, J. Electrochem. Soc. 103 (1956) 112.Google Scholar
  6. 6.
    G. J. Hahn and S. S. Shapiro, “Statistical Models in Engineering” (Wiley, New York, 1967) p. 99.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1986

Authors and Affiliations

  • B. Roebuck
    • 1
  • E. G. Bennett
    • 1
  • E. A. Almond
    • 1
  • M. G. Gee
    • 1
  1. 1.National Physical LaboratoryTeddingtonUK

Personalised recommendations