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HomeKey Engineering MaterialsKey Engineering Materials Vol. 617Thermal Stability of MAX Phases

Thermal Stability of MAX Phases

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Abstract:

The susceptibility of MAX phases to thermal dissociation at 1300-1550 °C in high vacuum has been studied using in-situ neutron diffraction. Above 1400 °C, MAX phases decomposed to binary carbide (e.g. TiC_x) or binary nitride (e.g. TiN_x), primarily through the sublimation of A-elements such as Al or Si, which results in a porous surface layer of MX_x being formed. Positive activation energies were determined for decomposed MAX phases with coarse pores but a negative activation energy when the pore size was less than 1.0 μm. The insights for tailor-design of MAX phases with controlled thermal stability and intercalated MXenes for energy storage are addressed.

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Periodical:

Key Engineering Materials (Volume 617)

Pages:

153-158

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.617.153

Citation:

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Online since:

June 2014

Authors:

It Meng Low*, Wei Kong Pang

Keywords:

Activation Energy, Decomposition, MAX Phases, Thermal Stability

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