Combustion phenomena of metal powders in contact with NaNO3used as propellants have been studied in order to find out burning rate variations at different oxidiser levels. Commonly used metals like Mg, Al, Zr and B (a metalloid) have been considered for the present study. It is found that the burning rate of the propellants largely depends on mixture ratio of the fuel and oxidiser. The burning rate of Mg-NaNO3and Zr-NaNO3propellants decreases with increasing concentration of NaNO3in contrast to the energy content of the propellants, On the otherhand the burning rate as well as the energy content of Al-NaNO3and B-NaNO3propellants increases with increasing NaNO3concentration.
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