Scale Resistance of Titanium Silicide Ti5Si–Titanium-Aluminide TiAl3 Powder Composites

The microstructure, phase composition, and resistance to oxidation upon heating in air in the temperature range of 600–1100°С for composites synthesized in the gasless combustion mode of reactive powder mixtures of titanium, aluminum, and silicon have been studied. Silicide Ti 5 Si 3 and titanium trialuminide TiAl 3 were synthesized from two-component mixtures. The combustion products of ternary mixtures contain Ti 5 Si 3 and TiAl 3 , the ratio of which depends on the aluminum content in the reaction mixtures. The scale resistance of the synthesized powder composites is determined to a greater extent by the microstructure of the granules than by their phase composition. The composition was determined of the reaction powder mixture, the combustion products of which have a scale resistance 1.5–3 times higher than the combustion products of the other studied compositions.