Influence of Component Ratio, Mechanical Activation, and Preclamping of Samples on Combustion in the (5Ti + 3Si) + (Ti + 2B) System

This paper examines the influence of component ratio, mechanical activation, and preclamping of samples on the combustion speed and elongation of unclamped samples during synthesis and the phase composition and morphology of combustion products in the (5Ti + 3Si) + (Ti + 2B) system. The combustion front did not reach the lower end face of the sample prepared from a 5Ti + 3Si starting mixture. Preclamping, mechanical activation of the 5Ti + 3Si mixture, or the addition of a Ti + 2B mixture enabled complete combustion of the sample. Mechanical activation of (100 – x)(5Ti + 3Si) + x(Ti + 2B) mixtures increased the elongation and combustion speed of the samples. The combustion speed was shown to have a tendency to decrease with increasing 5Ti + 3Si content. Preclamping increased the combustion speed of the samples prepared from the mechanically activated mixtures and had little or no effect on the combustion speed of the samples prepared from the starting mixtures (except for the Ti + 2B mixture). For some starting mixtures, preclamping led to shrinkage of the samples. The samples containing 20% 5Ti + 3Si mixture had the highest combustion speed. The elongation of the samples prepared from the (100 – x)(5Ti + 3Si) + x(Ti + 2B) starting mixtures was a nonmonotonic function of their composition, with extrema. Neither preclamping of the samples nor mechanical activation of the starting mixtures caused changes in the phase composition of the combustion products.