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The ability of porous silicon to actively participate in oxidative reactions leading to combustion and explosion when interacting with reagents in the pores was established about twenty years ago [1] but because of the high propagation velocities of these physicochemical transformations (102-103 m/s), it was di©cult to understand their mechanisms.

The results of experiments on combustion of porous silicon (pSi) layers with a thickness ranging from 19 to 135 pm at oxygen pressure up to 33 bar and spark initiation of the process are presented, as well as the possible modes of pSi combustion in oxygen are indicated.