The experimental data is presented in the article concerning the impact sensitivity of mixtures of ocfol-3,5 (octogen) with various metal oxides (Fe2O3, V2O5, TiO2, particle size is 1–2 µm). The experiment was carried out by the method of critical pressures using a tensometric technique. As a result obtained are the dependences of the critical pressure of octogen mixtures initiation with metal oxides on the mass content of the latter. For the mixture of octogen + Fe2O3, significant sensitization of the base explosive was noted at an additive concentration of 30 %. With an increase of the iron oxide content in the mixture, a gradual decrease in its impact sensitivity is observed. When considering a mixture of octogen + V2O5, the similarity of the process with that observed when using iron (III) oxide in a mixture was shown, however, the quantitative indicators still differ slightly. With an increase in the concentration of V2O5 to 50 %, a sharp jump in the critical pressure of initiation is noticeable, which was not observed when the iron oxide was involved. Starting already from this fraction, the additive does not have a sensitizing effect on the base explosive.
When considering the mixture of octogen + TiO2, its qualitative difference from the other two mixtures was noticed. In the area of low concentrations, the effect of dioxide on the sensitivity of the explosive is almost imperceptible. With a further increase in the mass fraction of titanium oxide in the mixture, a sharp sensitization is observed, in which the clear minimum was not found, and the concentration, at which a decrease in the sensitivity of the mixture would be observed, was not determined either. Minimum critical pressure for initiating an explosive reaction for Fe2O3 and V2O5 is in the range of mass fractions of 10–15 %, and is equal to 0.46 and 0.52 GPa, respectively. For mixtures of octogen + TiO2, this minimum is expressed dimly, and is equal to 0.55 GPa.
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