Combustion of 5Ti + 3Si Blends: Impact of Granule Diameter and Ti Particle Size

Abstract

This work explains the different ratio of the burning velocities of powder and granulated 5Ti + 3Si mixtures with Ti particles 35 and 120 μm in size due to the influence of impurity gases, which depends on the conditions for heating up the particles ahead of the combustion front. For the first time, the burning velocity inside the granule was obtained using the measured combustion velocities of mixtures of different granule sizes 0.6 ≤ D ≤ 1.7 mm. It turned out to be equal to the velocity of the combustion front in the granulated mixture for fine Ti particles and the velocity of the combustion front in the powder mixture for coarse Ti particles. The difference in the burning rates of the substance of granule and powder mixture serves as a quantitative measure of the influence of impurity gases. The results confirmed the applicability of the developed conditions for heating up the powder components to predict the retarding effect of impurity gases on the synthesis velocity in 5Ti + 3Si powders.