High temperature decomposition kinetics of Ti3GeC2 MAX phase

Mane, Rahul B. and Vijay, R. and Panigrahi, Bharat B. and Chakravarty, D. (2021) High temperature decomposition kinetics of Ti3GeC2 MAX phase. Materials Letters, 282. p. 128853. ISSN 0167577X

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Abstract

Abstract The present work aims to investigate the in-situ decomposition behavior of sintered Ti3GeC2 MAX phase. The samples were heated to temperatures ranging between 1623 and 1773 K in air and held isothermally for 120 min. Thermogravimetric analysis yielded a weight loss of upto 30% in the temperature range 1683–1698 K, attributed to evaporation of the GeO2 phase. The decomposition rate was parabolic in nature for temperatures ≥ 1723 K; at lower temperatures it was near-parabolic. The rate of decomposition was analyzed using conventional kinetic models and the activation energy for decomposition was dependent on several physical and chemical factors. Decomposition was found to initiate with an activation energy of about 504 kJmol−1. The major phase after complete decomposition was rutile having a layered microstructure with trace amounts of GeO2.

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IITH Creators:

IITH Creators	ORCiD
Panigrahi, Bharat Bhooshan	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Chemical factors; Decomposition behaviors; Decomposition rate; High-temperature decomposition; Kinetic models; Layered microstructure; Lower temperatures; Temperature range;Chemical analysis; Decomposition; Germanium oxides; Oxide minerals; Thermogravimetric analysis; Titanium dioxide

Subjects:

Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

27 Jul 2021 05:13

Last Modified:

04 Mar 2022 04:42

URI:

http://raiithold.iith.ac.in/id/eprint/8539

Publisher URL:

http://doi.org/10.1016/j.matlet.2020.128853