Shock-wave synthesis in powder mixtures

The work is aimed at studying the features and conditions of initiation, reaction, gas generation and final phase formation in the energy condensed "metal-teflon" systems with two types of initiation: local heat pulse and shock-wave loading. Approximate thermodynamic calculations were carried out using THERMO program, which took into account three mixtures and samples of them: (Ni + Al + Teflon), (Ti + B + Teflon), (Hf + B + Teflon). The adiabatic combustion temperatures of mixtures, the composition and the amount of condensed products, and the volume of gaseous products are calculated. Gas formation during combustion of mixtures was measured in a spherical ampoule equipped with temperature and pressure sensors. Shock-wave loading of the samples was carried out in a multi-cell matrix by throwing a flat impactor. The acceleration of the impactor was carried out by the detonation products of the explosive. The design of the recovery fixture provided the same loading conditions in all cells. The investigated compositions are capable of an intense exothermic reaction, both at traditional ignition of a heated spiral, and at shock-wave action. (paper)