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The Isothermal Oxidation Behavior of Ti2AlN and Ti2AlN/TiN in Air

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Abstract:

The isothermal oxidation behaviors at 800-1000°C for 20h in air of bulk Ti2AlN and Ti2AlN/TiN were investigated by TG, XRD and SEM coupled with EDS. The oxidation behaviors generally follow the parabolic law. The activation energies of Ti2AlN and Ti2AlN/TiN composite are 614.93 KJ∙mol-1 and 541.35 KJ∙mol-1 respectively. The antioxidation property of Ti2AlN/TiN composite is better than Ti2AlN. Oxidation process of single-phase Ti2AlN is composed by the outward diffusion of Al3+ and Ti4+, and inward diffusion of oxygen. Oxidation process of Ti2AlN/TiN composite consists of two parts: firstly, the oxidation of TiN, the oxidation temperature is 500 °C; the second step is the oxidation of Ti2AlN, carried out mainly in the 800-1000 °C.

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Periodical:

Advanced Materials Research (Volumes 306-307)

Pages:

808-813

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.306-307.808

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Online since:

August 2011

Authors:

Ming Yan, Yan Lin Chen, Ying Chang, Jiu Xin Jiang, Bing Chu Mei

Keywords:

Antioxidation Property, Isothermal Oxidation Behavior, Ti2AlN, Ti2AlN/TiN Composite

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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