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Oxidation resistance of Ti 3 AlC 2 and Ti 3 Al 0.8 Sn 0.2 C 2 MAX phases: A comparison
Author(s) -
Drouelle Elodie,
Brunet Veronique,
Cormier Jonathan,
Villechaise Patrick,
Sallot Pierre,
Naimi Foad,
Bernard Frederic,
Dubois Sylvain
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16780
Subject(s) - materials science , max phases , spark plasma sintering , oxide , rutile , solid solution , phase (matter) , diffusion , analytical chemistry (journal) , sintering , titanium , atmospheric temperature range , metallurgy , chemical engineering , ceramic , chemistry , thermodynamics , physics , organic chemistry , chromatography , engineering
Ti 3 AlC 2 and Ti 3 Al 0.8 Sn 0.2 C 2 MAX phase powders are densified using Spark Plasma Sintering (SPS) technique to obtain dense bulk materials. Oxidation tests are then performed over the temperature range 800°C‐1000°C under synthetic air on the two different materials in order to compare their oxidation resistance. It is demonstrated that, in the case of the Ti 3 Al 0.8 Sn 0.2 C 2 solid solution, the oxide layers consist in TiO 2 , Al 2 O 3 , and SnO 2 . The presence of Sn atoms in the A planes of the solid solution leads to an easy diffusion of Sn out of the MAX phase which promote the formation of the nonprotective and fast growing SnO 2 oxide. Moreover, the small Al/Ti atom's ratio promotes the growth of a nonprotective rutile‐TiO 2 scale as well. In the case of the Ti 3 AlC 2 MAX phase, the oxide layer consists in a protective alumina scale; a few TiO 2 grains being observed on the top of the Al 2 O 3 layer. The parabolic oxidation rate constants are about 3 orders of magnitude smaller for Ti 3 AlC 2 compared to Ti 3 Al 0.8 Sn 0.2 C 2 .