Journal Article

FZJ-2021-00010

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Synthesis, sintering, and effect of surface roughness on oxidation of submicron Ti 2 AlC ceramics

Badie, S. (Corresponding author)FZJ* ; Dash, A.FZJ* ; Sohn, Y. J.FZJ* ; Vaßen, R.FZJ* ; Guillon, O.FZJ* ; Gonzalez‐Julian, J.FZJ*

2021
Soc. Westerville, Ohio

This record in other databases:  

Please use a persistent id in citations: http://hdl.handle.net/2128/27162  doi:10.1111/jace.17582

Abstract: 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.

---

Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 1241 - Gas turbines (POF4-124) (POF4-124)

Appears in the scientific report 2021

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---