TY - JOUR
T1 - Bonding and oxidation protection of Ti2AlC and Cr2AlC for a Ni-based superalloy
AU - Sokol, Maxim
AU - Yang, Jian
AU - Keshavan, Hrishikesh
AU - Barsoum, Michel W.
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/4
Y1 - 2019/4
N2 - Alumina forming, oxidation and thermal shock resistant MAX phases are of a high interest for high temperature applications. Herein we report, on bonding and resulting interactions between a Ni-based superalloy, NSA, and two alumina forming MAX phases. The diffusion couples Cr2AlC/Inconel-718/Ti2AlC were assembled and heated to 1000 or 1100 °C in a vacuum hot press under loads corresponding to stresses of either 2 MPa or 20 MPa. The resulting interfaces were examined using X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Good bonding between Cr2AlC and NSA was achieved after hot pressing at 1000 °C and a contact pressure of only 2 MPa; in the case of Ti2AlC a higher temperature (1100 °C) and pressure (20 MPa) were needed. In both cases, a diffusion bond, in which mainly Ni and Cr out diffused from the NSA into the MAX phase and a concomittant out diffusion of Al from the latter, was realized with no evidence of interfacial damage or cracking after cooling to room temperature. The reactions paths were determined to be: Cr2AlC/Cr7C3/Cr7C3,β-NiAl/α-Cr(Mo)/NSA and Ti2AlC/Ti2AlC,Ti3NiAl2C/β-NiAl/α-Cr(Mo)/NSA. Twenty thermal cycles from room temperature to 1000 °C showed that Ti2AlC is a poor oxidation barrier for Inconel-718. However, in the case of Cr2AlC no cracks, delamination nor surface degradation was observed, suggesting that this material could be used to protect Inconel-718 from oxidation.
AB - Alumina forming, oxidation and thermal shock resistant MAX phases are of a high interest for high temperature applications. Herein we report, on bonding and resulting interactions between a Ni-based superalloy, NSA, and two alumina forming MAX phases. The diffusion couples Cr2AlC/Inconel-718/Ti2AlC were assembled and heated to 1000 or 1100 °C in a vacuum hot press under loads corresponding to stresses of either 2 MPa or 20 MPa. The resulting interfaces were examined using X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Good bonding between Cr2AlC and NSA was achieved after hot pressing at 1000 °C and a contact pressure of only 2 MPa; in the case of Ti2AlC a higher temperature (1100 °C) and pressure (20 MPa) were needed. In both cases, a diffusion bond, in which mainly Ni and Cr out diffused from the NSA into the MAX phase and a concomittant out diffusion of Al from the latter, was realized with no evidence of interfacial damage or cracking after cooling to room temperature. The reactions paths were determined to be: Cr2AlC/Cr7C3/Cr7C3,β-NiAl/α-Cr(Mo)/NSA and Ti2AlC/Ti2AlC,Ti3NiAl2C/β-NiAl/α-Cr(Mo)/NSA. Twenty thermal cycles from room temperature to 1000 °C showed that Ti2AlC is a poor oxidation barrier for Inconel-718. However, in the case of Cr2AlC no cracks, delamination nor surface degradation was observed, suggesting that this material could be used to protect Inconel-718 from oxidation.
KW - Characterization
KW - Diffusion
KW - MAX phase
KW - Nickel
KW - Super alloy
UR - http://www.scopus.com/inward/record.url?scp=85055738133&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2018.10.019
DO - 10.1016/j.jeurceramsoc.2018.10.019
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:85055738133
SN - 0955-2219
VL - 39
SP - 878
EP - 882
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 4
ER -