Synthesis and oxidation of Ti_2InC, Zr_2InC, (Ti_(0.5),Zr_(0.5))_2InC and (Ti_(0.5),Hf_(0.5))_2InC in air

摘要

In this paper, we report on the synthesis and oxidation behavior of Ti_2InC, Zr_2InC, (Ti_(0.5),Hf_(0.5))_2InC and (Ti_(0.5),Zr_(0.5))_2InC. The oxidation kinetics were studied thermogravimetrically in air in the 400-700 deg C temperature range. With the exception of Ti_2InC, the oxide layers formed failed to offer any oxidation resistance at 400 deg C or higher temperatures. The reaction products are In_2O_3, in which some transition metal ions are probably dissolved, and the transition metal oxides. The latter are either amorphous or nanocrystalline. In the case of Ti_2InC, a protective oxide was formed at 500 deg C. However, at higher temperatures, after an incubation period, catastrophic oxidation ensued. In all cases, the oxidation occurred by the inward diffusion of oxygen.