Preparation of Zirconia-Alumina Fine Powders by Hydrothermal Oxidation of Zr-A1 Alloys

  • Shigeyuki Somiya
  • Masahiro Yoshimura
  • Shinya Kikugawa
Part of the Materials Science Research book series (MSR, volume 17)


Fine powders of pure metal oxides can be prepared by hydrothermal oxidation method. This technique can provide the fine powders of homogeneous ZrO2-Al2O 3 mixtures from Zr-Al alloys at temperatures 600-700 °C under 100 MPa pressure for 3 h, according to the reactions,

2 ZrAl3 + 13 H2O = 3 A12O3 + 2 ZrO2 + 13 H2, and

2 Zr5Al3 + 29 H2O = 10 ZrO2 + 3 Al2O3 + 29 H2.

The average crystallite sizes were 27–35 nm for a-Al2O3, 13–24 nm for nonoclinic ZrO2 and 9–12 nm for tetragonal ZrO2 in the products.


Average Crystallite Size Boron Carbide Alloy Oxidation Zirconium Hydride Hydrothermal Oxidation 
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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • Shigeyuki Somiya
    • 1
  • Masahiro Yoshimura
    • 1
  • Shinya Kikugawa
    • 1
  1. 1.Laboratory for Hydrothermal Syntheses Research Laboratory of Engineering MaterialsTokyo Institute of TechnologyMidori, Yokohama 227Japan

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