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On the interactions of Ti2AlC, Ti3AlC2, Ti3SiC2 and Cr2AlC with silicon carbide and pyrolytic carbon at 1300 degrees C
Journal article   Open access

On the interactions of Ti2AlC, Ti3AlC2, Ti3SiC2 and Cr2AlC with silicon carbide and pyrolytic carbon at 1300 degrees C

G. W. Bentzel, M. Ghidiu, B. Anasori and M. W. Barsoum
Journal of the European Ceramic Society, v 35(15), pp 4107-4114
01 Dec 2015
DOI: https://doi.org/10.1016/j.jeurceramsoc.2015.07.029
url
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8118158View
Accepted (AM)Open Access (License Unspecified),  Open

Abstract

Materials Science Materials Science, Ceramics Science & Technology Technology
Herein we report on the reactivity between silicon carbide, SiC, and pyrolytic carbon, PG, with the MAX phases, Ti2AlC, Ti3AlC2, Ti3SiC2 and Cr2AlC. Diffusion couples were assembled and heated to 1300 degrees C under a load corresponding to a uniaxial stress of similar to 30 MPa for 4, 10, and 30 h in a vacuum hot press, at a vacuum level of less than 1 Pa. The couples were then examined using optical and scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and orientation image microscopy. Based on the totality of the results - after 30 hat 1300 degrees C - it is concluded that neither Ti3SiC2 nor Cr2AlC appear to react with SiC. The former also appears not to react with PG. When heated in the vacuum of the hot press, both Ti2AlC and Ti3AlC2 dissociated to form TiC surface layers that were approximate to 15-20 mu m thick. After reaction of Ti2AlC with SiC and PG, the TiC layer was only approximate to 10 mu m thick, indirectly confirming that the dissociation of these phases in vacuum was due to the Al evaporation from the surfaces. The Ti3AlC2/SiC and Ti3AlC2/PG diffusion couples resulted in TiC layers that were approximate to 50 mu m and approximate to 100 mu m thick, respectively. The Cr2AlC/PG diffusion couple resulted in the formation of approximate to 10 mu m interfacial layer comprised of Cr3C2 and Cr7C3 at the interface between the two materials. (C) 2015 Elsevier Ltd. All rights reserved.

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