Reactivity of Tf with Ti-C Pyrolants

The ignition temperature of a mixture of Ti and C is relatively high compared with those of other pyrolants. When a small amount of polytetrafluoroethylene (Tf) is added to a Ti-C pyrolant, the ignition temperature is significantly lowered due to the exothermic reaction between Ti and Tf Since Tf consists of a -C2F4- chemical structure, the oxidizer gas, F2, is formed by thermal decomposition of Tf according to  

These processes are accompanied by heat release, similar to the reaction of Tf and Mg, i. e.. Mg particles are oxidized to form MgF2- It has been reported that the exothermic reaction between Ti and C occurs only when the mixture is heated above 2000 K. Since the reaction between Ti and Tf occurs at a lower temperature of about 830 K, the remaining Ti within the Ti-C pyrolant readily reacts with C with the aid of the heat generated by this reaction. 

Since the reaction of Ti occurs at the surface of each particle, the reaction of the Ti and C particles is dependent on the total surface area of the Ti particles, 3xi, incorporated into the pyrolant. The relationship between the burning rate, r, and Pxi 

Iron oxides a-Pe203, y-Fe203, Co-7-Fe203, FeOOH 

Sodium nitrate Strontium nitrate Graphite Whisker Fiber 

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