High Temperature Oxidation and Hot Corrosion Behavior of Ti_3SiC_2-Based Materials

摘要

The high temperature oxidation behavior of Ti_3SiC_2 was studied from 900 deg. C to 1200 deg. C in air. The present results showed that scale growth obeyed a parabolic law below 1100 deg. C, while above 1200 deg. C it was two-step parabolic law or linear law depending on the TiC content in Ti_3SiC_2. The oxide scale was generally composed of an outer layer of coarse-grained TiO_2 (rutile) and an inner layer of fine-grained TiO_2 and SiO_2 (tridymite) above 1000 deg. C. A discontinuous SiO_2 "barrier" was observed within the outer coarse-grained TiO_2 layer on the samples oxidized at 100 deg. C and 1200 deg. C.