This experimental work is providing kinetic data on metal oxidation reactions for Air Force rocket propulsion and ramjet technology programs using the HTFFR (High-Temperature Fast-Flow Reactor) technique over the temperature range 300 to 1900 K. The reaction mechanisms and rate coefficients have been obtained from optical absorption and fluorescence measurements of the consumption of metal atoms or metal monoxide/monohalide radicals, as functions of pressure, oxidizer concentration, reaction time, and temperature; these variables are independently controlled.

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The tubular fast-flow reactor, previously used for reaction kinetic measurements at temperatures up to only 1000K, has been adapted to reach temperatures up to 2000K and has been applied to studies of gas phase reactions of metal atoms with O2. The most extensive set of results obtained so far is for the Fe/O2 reaction in an N2 bath at 1600K. Preliminary results for the Al reaction with O2 at 1700K are discussed. The experimental technique described here allows measurements to be made under reaction conditions overlapping those used in flame and shock-tube studies. A design study for a wall-less reactor which would allow extension of metal atom oxidation studies down to about 200 to 300K is also reported. (Author).