Home – Home – Jornals – Combustion, Explosion and Shock Waves 2026 number 3

The effect of preliminary mechanical activation (MA) of carbon black powder on the properties, compaction, and combustion patterns of Ti + C mixtures in an equiatomic ratio of components was studied. It was shown that during the MA process, the arched structure is destroyed and agglomerates of carbon black particles are crushed, which leads to an increase in bulk density by more than three times. It was found that during compaction, carbon black powder behaves as a solid non-plastic material with a high elastic aftereffect (up to 14%). It was shown that in Ti + C mixtures above a relative density of 0.52, a framework of titanium particles is formed, which is responsible for the strength properties of the compacts. It was found that compaction of Ti + C mixtures to a pressure of 50 MPa corresponds to the stage of structural deformation, and above this pressure, the stage of elastic-plastic deformation begins. It is shown that the relative density of compacts from Ti + C mixtures at the onset of the elastic-plastic deformation stage depends on the degree of MA of the carbon black powder. At the same pressure of 50 MPa, mixtures with more dispersed carbon black compact to a higher relative density of 0.65. It is shown that the dependences of the combustion temperature of compacts made from Ti + C mixtures on pressure and density have maxima. Increasing the density of Ti + C mixtures at the structural deformation stage (pressure up to 50 MPa) ensures an increase in the contact surface between the reactants and, consequently, an increase in the combustion temperature. With a further increase in compaction pressure at the beginning of the elastic-plastic deformation stage, the increase in the contact surface between the titanium particles leads to a decrease in the combustion temperature. It was found that the absolute value of the combustion temperature peaks increased with increasing density: for the mixture with the original soot, T_max ≈ 2900 °C at a relative density of 0.58; for the mixture with soot after 3 hours of MA, T_max ≈ 3000 °C at a density of 0.63; for the mixture with soot after 20 hours of MA, T_max ≈ 3200 °C at a density of 0.65. With increasing pressing pressure, the combustion rate decreases due to deterioration in the conditions for removing impurity gases from the volume of the original compacts. The appearance of delamination cracks is shown to lead to a sharp increase in the combustion rate.