Heterophase Combustion of Silane near the First Ignition Limit
Heterophase combustion of silane near the first ignition limit was studied. It was found that the reaction of chain initiation on quartz in the zone of hydrogen and silane combustion manifested itself as positive feedback, which was enhanced during exposure of the reactor walls to the products of the low-pressure flame. It was shown that, in a silane-oxygen flame at a temperature of 350-500oC, the quartz surface was activated as a catalyst of heterogeneous chain initiation much more strongly than it was in a hydrogen flame. It was shown that the previously found increase in the concentration of atomic hydrogen during oxidation of silane in oxygen below the first limit was related to the formation of new lattice structures saturated with crystal lattice defects, whose number on the wall increases continuously during condensation of the final reaction products, together with adsorption silicon-containing radicals.