Oxidation of Ti₃Al_0.3Si_0.7C₂ Compounds at 900-1200^oC in Air

Title:Oxidation of Ti₃Al_0.3Si_0.7C₂ Compounds at 900-1200^oC in Air

Volume: 10 Issue: 1

Author(s): Jae Chun Lee, Sang Whan Park and Dong Bok Lee

Affiliation:

Keywords: Oxidation, powder metallurgy, Ti₃SiC₂, Ti₃AlC₂, Ti₃(Al, Si)C₂.

Abstract: Ti₃Al_0.3Si_0.7C₂ compounds were synthesized via the powder metallurgical process, and oxidized isothermally and cyclically between 900 and 1200 ^oC in air. They had good thermal shock resistance, forming adherent oxide scales during cyclic oxidation. They oxidized to rutile-TiO₂, α-Al₂O₃, and amorphous SiO₂, together with gaseous escape of carbon. The oxide scales that formed during isothermal and cyclical oxidation were similar in that an outer (TiO₂, Al₂O₃)-mixed scale, a thin intermediate Al₂O₃ layer, and an inner (TiO₂, SiO₂)-mixed scale formed. The outer scale formed by the outward diffusion of Ti⁴⁺ and Al³⁺ ions. The intermediate scale formed by the outward diffusion of Al³⁺ ions. The inner scale formed by the inward diffusion of O^2- ions. No selective oxidation occurred from the early oxidation period.

Cite this article as:

Lee Jae Chun, Park Sang Whan and Lee Dong Bok, Oxidation of Ti₃Al_0.3Si_0.7C₂ Compounds at 900-1200^oC in Air, Current Nanoscience 2014; 10 (1) . https://dx.doi.org/10.2174/1573413709666131108231720