Silicon infiltration combustion

Figure 1.18 Silicon infiltration combustion nitriding completeness degree ( f) on dilution...

Figure 9.28 Combustion still of mesoporous silicon infiltrated with PFPE. (Reproduced with kind permission from Prof Steve Son and Aaron B. Mason [24].)...

The combustion temperature of mesoporous silicon infiltrated with PFE is... 

The dependence of combustion temperature and velocity for the Si-N2 system as a function of dilution with /3-Si3N4 powder is shown in Fig. 38. In this case, at constant gas pressure, remains constant and is equal to the dissociation temperature of silicon nitride, for dilutions up to 60 wt %. However, with increasing dilution, the combustion front velocity increases. Also, increasing the overall heat evolution, smaller dilution by nonmelted nitride powder promotes coalescence of liquid Si particles, leading to an increase in the average reactant particle size, as well as to formation of thin liquid Si films, which blocks nitrogen infiltration to the reaction zone (Mukasyan et al, 1986). The same effects were also observed for the AI-N2 and B-N2 systems (Mukasyan, 1994), which are characterized by dissociation of the final product in the combustion wave. 

The combustion flame of pulverized mesoporous silicon mixed with perfluoroe-icosane (C20F48) (PFE) is depicted in Figure 9.27 [23]. The ignition of a mesoporous silicon waver infiltrated with polyfluoropolyether (PFPE) is seen in Figure 9.28 [24]. 

---