Reactions of titanium metal powders with high-temperature high-pressure ammonia

  • S. Sōmiya
  • M. Yoshimura
  • H. Toraya


Nitride powders as ceramic materials have been synthesized mainly by two methods: one employing the reduction of oxide powders and the succeeding nitridation with N2 and/or NH3 gases at high temperatures, and the other by the direct nitridation of metals or their hydrides. The latter method has a great affinity with the hydrothermal oxidation method, a technique for preparing fine oxide powders (20 to 35 nm) from metals, such as of zirconium [1], hafnium [2], titanium [3] or aluminium [4], by the reaction with high-temperature high-pressure water. The hydrothermal oxidation mechanism of hafnium metals has been studied in detail [5], and elucidated to proceed through two reaction paths: one is the direct oxidation of hafnium with high-temperature high-pressure water to form HfO2 and H2, and the other the formation of hafnium hydrides by the reaction of hafnium metals with released H2 and the succeeding oxidation of hydrides.


Pressure Vessel Titanium Nitrides Titanium Hydride Titanium Metal Rotary Pump 
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Copyright information

© Elsevier Science Publishers LTD 1989

Authors and Affiliations

  • S. Sōmiya
    • 1
  • M. Yoshimura
    • 1
  • H. Toraya
    • 1
  1. 1.Research Laboratory of Engineering MaterialsTokyo Institute of TechnologyMidori, YokohamaJapan

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