Particle Size Distribution and Surface Area Effects on the Burn Rate

Particle Size Distribution and Surface Area Effects on the Burn Rate 

The influence of both PTFE and Mg particle size distribution on combustion of MTV and its pressure sensitivity has been investigated in great detail by Jackson and Dadley [3], Kubota [6-8] and Kuwahara [9-11]. The data can be summarized as follows  

In turn, low burn rates and high-pressure exponent pyrolants are realized with the opposite settings. The ambient pressure combustion behaviour of pyrolants made from 17.6 pm Mg and 5wt% Viton with different type PTFE particles is depicted in the following pictures. Both PTFE types were further fractionated to obtain defined particle size distributions. 

The combustion behaviour of fuel-lean Mg/PTFE pyrolants (23/77) at reduced pressure (2-26kPa) indicates an incomplete reaction [12]. From another study, 

54wt% Magnesium, type III, granulation 16, with 50-55 wt% is 325 mesh 30wt% Teflon, L-P-403 with 15 wt% type II and 15% type IV 16 wt% Viton, WS 7682 

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