A Critical Review of the Oxidation of Ti2AlC, Ti3AlC2 and Cr2AlC in Air

By Darin J. Tallman, B. Anasori, Michel W. Barsoum. 2013

367 citations recorded by the source corpus.

Of all the M n+1AX n phases, the most resistant to oxidation in air in the 900–1,400°C temperature range are Ti2AlC, Ti3AlC2 and Cr2AlC. A literature review, however, shows that while many claim the oxidation kinetics to be parabolic, others claim them to be cubic. Whether the kinetics are parabolic or better is of vital practical importance. By carefully re-plotting the results of others and carrying out one oxidation run for ≈3,000 h at 1,200°C on a Ti2AlC sample, we conclude that the oxidation kinetics are better described by cubic kinetics and that even that conclusion is an approximation. Lastly, we present compelling evidence that the rate-limiting step during the oxidation of Ti2AlC is diffusion down the alumina scale grain boundaries.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/14942b4bd52e6cf2476e380bc38b9755e36a747c

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In Materials Chemistry

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Citations in the corpus

• Protective coatings on zirconium-based alloys as accident-tolerant fuel (ATF) claddings (2017, background): “Al-containing MAX phases, especially Ti 2 AlC and Cr 2 AlC, possess excellent high-temperature oxidation resistance both in air and in steam due to the formation of a dense and adherent alumina scale (Tallman et al., 2013).”