Ignite precursor systems

The synthesis of TiiAlN was conducted by SHS with a local ignition system and different precursors. The first set of precursors was a rriixture of titanium and aluminium powders set in appropriate stoichiometric ratio ignited in a nitrogen the atmosphere. The expected chemical reaction was the direct synthesis of anticipated compound ... 

From the standpoint of combustion our result means that temporarily the population of molecules will split into a part for which combustion has not yet taken place, and a part for which combustion is pratically terminated. In other words, ignition time becomes a random variable, whose variance is directly related to the coexistence time of the two probability peaks. Moreover, in a spatially distributed system the population of molecules involved in the process will tend to separate in space, thereby producing a "nucleus" of combustion which eventually will propagate in the system. Such a phenomenon will be the precursor of hot spots or flames that have been widely referred to in the... 

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