Microstructural characterization and isothermal oxidation behavior of hot-pressed TiB2–10 wt.% TiSi2 composite

This paper reports on the results of fine-scale microstructural characterization and isothermal oxidation of hot-pressed TiB2–10 wt.% TiSi2 composite. The careful analysis of selected-area diffraction patterns using transmission electron microscopy confirms the presence of Ti5Si3 as a reaction product along with TiB2 and TiSi2 phases. The results of oxidation testing at 1200 °C for 12 h using a thermogravimetric analyzer illustrate near-parabolic oxidation scale growth characteristics. The oxidation mechanisms are discussed with reference to thermodynamically feasible oxidation reactions.