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Hydrothermal Reaction Sintering of Pure Cr2O3

  • Shin-Ichi Hirano
  • Shigeyuki Sōmiya

Abstract

Much work has been done in an effort to fabricate a pure high-density Cr2O3. High volatilization of chromium oxide compounds, however, made its densification difficult. The studies reported to date on the sintering of Cr2O3 have been concerned mainly with controlling the sintering atmosphere and the additives. Hagel et al. 1 studied the initial sintering of Cr2O3 in an Ar atmosphere with a p0l of ≈10–2mm Hg but were unable to obtain a high density. Ownby and Jungquist2 studied the final sintering of Cr2O3, giving attention to the effect of oxygen activity and the addition of MgO on the sintering of Cr2O3. At 1600°C, their product approached theoretical density at Po2 = 2 x 10–12atm, whereas the high weight loss due to volatilization of chromium oxides was observed at po2 < 10–12 atm where the maximum density was achieved.

Keywords

Theoretical Density Supercritical Water Chromium Oxide Sintered Specimen High Weight Loss 
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References

  1. 1.
    W. C. Hagel, P. J. Jorgensen, and D. S. Tomalin, ‘Initial Sintering of ar-Cr2O3J. Am. Ceram. Soc., 49 [1] 23–26 (1966).CrossRefGoogle Scholar
  2. 2.
    P. D. Ownby and G. E. Jungquist, ‘Final Sintering of Cr203,’ ibid., 55 [9] 433–36 (1972).Google Scholar
  3. 3.
    Shin-ichi Hirano, Kazuo Nakamura, and Shigeyuki Somiya, pp. 418-23 in Proceedings of the International Conference on High Pressure, 4th, 1974. Edited by Jiro Osugi. Published 1975.Google Scholar

Copyright information

© Elsevier Science Publishers Ltd 1990

Authors and Affiliations

  • Shin-Ichi Hirano
    • 1
  • Shigeyuki Sōmiya
    • 1
  1. 1.Research Laboratory of Engineering Materials and the Department of Materials Science and TechnologyToyko Institute of TechnologyOokayama, Meguro-kuy,Tokyo 152Japan

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