Hydrothermal Reaction Sintering of Pure Cr2O3

  • Shin-Ichi Hirano
  • Shigeyuki Sōmiya


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 \({p_{{{\text{O}}_{\text{2}}}}}\) of ≈10−2 mm 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 \({p_{{O_2}}} = 2 \times {10^{ - 12}}\) atm, whereas the high weight loss due to volatilization of chromium oxides was observed at \({p_{{O_2}}} < {10^{ - 12}}\) atm where the maximum density was achieved.


Supercritical Water Chromium Oxide Sintered Specimen High Weight Loss Capsule Wall 
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  1. 1.
    W. C. Hagel, P. J. Jorgensen, and D. S. Tomalin, “Initial Sintering of α- Cr2O3,” J. Am. Ceram. Soc., 49 [1] 23–26 (1966).CrossRefGoogle Scholar
  2. 2.
    P. D. Ownby and G. E. Jungquist, “Final Sintering of Cr2O3,” J. Am. Ceram. Soc., 55 [9] 433–36 (1972).CrossRefGoogle Scholar
  3. 3.
    Shin-ichi Hirano, Kazuo Nakamura, and Shigeyuki Sōmiya, pp. 418–23 in Proceedings of the International Conference on High Pressure, 4th, 1974. Edited by Jiro Osugi. Published 1975.Google Scholar

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© Elsevier Science Publishers LTD 1989

Authors and Affiliations

  • Shin-Ichi Hirano
  • Shigeyuki Sōmiya

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