TY  - JOUR
AU  - Badie, Sylvain
AU  - Dash, Apurv
AU  - Sohn, Yoo Jung
AU  - Vaßen, Robert
AU  - Guillon, Olivier
AU  - Gonzalez‐Julian, Jesus
TI  - Synthesis, sintering, and effect of surface roughness on oxidation of submicron Ti 2 AlC ceramics
JO  - Journal of the American Ceramic Society
VL  - 104
IS  - 4
SN  - 1551-2916
CY  - Westerville, Ohio
PB  - Soc.
M1  - FZJ-2021-00010
SP  - 1669-1688
PY  - 2021
AB  - Submicron Ti2AlC MAX phase powder was synthesized by molten salt shielded synthesis (MS3) using a Ti:Al:C molar ratio of 2:1:0.9 at a process temperature of 1000°C for 5  hours. The synthesized powder presented a mean particle size of ~0.9 µm and a purity of 91 wt. % Ti2AlC, containing 6 wt. % Ti3AlC2. The Ti2AlC powder was sintered by pressureless sintering, achieving a maximal relative density of 90%, hence field‐assisted sintering technology/spark plasma sintering was used to enhance densification. The fine‐grained microstructure was preserved, and phase purity of Ti2AlC was unaltered in the latter case, with a relative density of 98.5%. Oxidation was performed at 1200°C for 50 hours in static air of dense monolithic Ti2AlC with different surface finish, (polished, ground and sandblasted) which resulted in the formation of an approx. 8 µm thin aluminum oxide (Al2O3) layer decorated with titanium dioxide (rutile, TiO2) colonies. Surface quality had no influence on Al2O3 scale thickness, but the amount and size of TiO2 crystals increased with surface roughness. A phenomenon of rumpling of the thermally grown oxide (TGO) was observed and a model to estimate the extent of deformation is proposed.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000599727500001
DO  - DOI:10.1111/jace.17582
UR  - https://juser.fz-juelich.de/record/889074
ER  -