Abstract
Ti3Al0.3Si0.7C2 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 O2- ions. No selective oxidation occurred from the early oxidation period.
Keywords: Oxidation, powder metallurgy, Ti3SiC2, Ti3AlC2, Ti3(Al, Si)C2.
Current Nanoscience
Title:Oxidation of Ti3Al0.3Si0.7C2 Compounds at 900-1200oC 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: Ti3Al0.3Si0.7C2 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 O2- ions. No selective oxidation occurred from the early oxidation period.
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Cite this article as:
Lee Jae Chun, Park Sang Whan and Lee Dong Bok, Oxidation of Ti3Al0.3Si0.7C2 Compounds at 900-1200oC in Air, Current Nanoscience 2014; 10 (1) . https://dx.doi.org/10.2174/1573413709666131108231720
DOI https://dx.doi.org/10.2174/1573413709666131108231720 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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