Fabrication of Oxide Ceramics Powder with Nano-size Particles by Using Super Heated High Temperature Steam for Chemical Reaction

Abstract

Various kinds of such new porous materials as non-oxide ceramics and intermetallic compounds, can be rapidly manufactured by combustion synthesis methods. By using combustion-synthesized materials of NiAl intermetallic compounds for a heater, it is possible to generate high temperature superheated steam. We have been able to generate superheated steam at 1000℃ by sending low temperature saturated steam at 100℃ from the bottom of a quartz tube filled with porous NiAl pellets that are heated by an electromagnetic induction coil wound outside the tube. Since superheated steam over 1000℃ was considered to be very reactive field, it was used for the fabrication of oxide ceramic powders with nano size. When mist of sakusann was induced to the superheated steam, NiO powder with the particle distribution from nanometer to subumicron could be synthesized. Such oxide nano powder as NiO was expected to using for catalyst.