Phase Characterization and Burning Rate in the Self-Propagating High Temperature Synthesis of Titanium Borides

Abstract

Combustion synthesis of titanium borides from Ti and B binary powder mixtures having molar ratios B/Ti of 1.9 to 2.4 resulted in the formation of TiB2 as the primary phase and TiB as the secondary phase. The amount of TiB decreased when the particle size of the Ti in the powder mixtures became small and when the B content was increased. The results are discussed in terms of the homogeneity of reactant powder mixtures and the degree of boron saturation of the Ti-B melt. The burning rate increased from Ii to 15 mm/s as the titanium particle size decreased from -100 to -325 mesh with the same boron particle size of -325 mesh.