Teflon combustion particles

Some investigators have also reported Teflon, polyvinylidene fluoride etc. as binders for Mg-based pressed formulations. Hydrocarbons like naphthalene, anthracene etc are also employed for this purpose. Naphthalene sublimes at a low temperature and combustion affinity of exhaust species with ram-air helps in ejecting the condensed particles through the nozzle. 

We have used both the horizontally and vertically configured impactors to sample coal-combustion aerosols in elevated plumes and in plumes at ground level near Deep Creek Lake in western Maryland. Few problems were encountered in this study however, particle bounce could not be evaluated for ambient samples because the individual submicrometer particles could not be discerned. Marple and Rubow (8) have performed extensive calibrations with monodisperse aerosols these show that impaction plates covered with aluminium foil have slightly larger D50S than plates covered with Teflon-fiber filters. 

Experimental studies of oil shale combustion fly ash aerosol under simulated day-time and night-time atmospheric-like conditions were performed at NICPB in a 190m outdoor Teflon film chamber. Continuous monitoring of particle size distributions is performed with various optical and electrical devices. The respiration fraction of particles, which contributes most to the health effects of the aerosols, is studied quantitatively. 

Unlike double base and composite propellants, the combustion rate of Magnesium/Teflon/Viton (MTV) does not correlate with the adiabatic combustion temperature, which has its maximum at (Mg) = 0.32. The combustion rate of MTV, however, correlates with the metal content as is observed for many other pyrolants such as Mg/NaNOs [1], Ti/KN03 and Zr/KNOs [2]. Thus, it increases exponentially with f (Mg) up to stoichiometries between 55 and 70%. The peak range appears to depend on the surface area of both Mg and polytetrafluorethylene (PTFE) particles applied [3-5]. 

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