Explosive oxidation of HPHT diamond particles

Jae K. Lee, Michael W. Anderson, Fraser A. Gray, Phillip John

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The thermal oxidation of high pressure and high temperature (HPHT) diamond powders, of between 0.75 and 1.5 µm diameters, has been studied in dry oxygen. Under conditions of poor thermal transfer between the powders and the substrate extremely rapid oxidation has been observed. The onset temperature of the latter 'explosions' occurs between 514 and 576 °C, at 1 atm O2 pressure, where bulk diamond is known to oxidise relatively slowly. A model has been developed in which the exothermicity of the surface oxidation reaction is not dissipated when the sample is in poor thermal contact with the support. A runaway 'explosion' occurs in samples of high surface area/volume particulate diamond arising from the high activation energy of the oxidation kinetics of diamond coupled with poor thermal contact. Improving the thermal contact allows diamond powders with the diameters of about 1 µm to be stable even at temperatures up to 700 °C. © 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1206-1209
Number of pages4
JournalDiamond and Related Materials
Volume15
Issue number9
DOIs
Publication statusPublished - Sep 2006

Keywords

  • Nanoparticles
  • Oxidation
  • Surface characterization
  • Synthetic diamond

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