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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 630 pages |
| ISBN: | 978-0-9879917-2-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Reactions Between Ti3SixAl(1-x)C2 (x = 0 - 1) Solid Solutions And A Molten Cryolite-AlF3-CaF2-Al2O3 Electrolyte
Xiao Yan1; Ty Tran2; Marshall Lanyon2; Shou Sun2;1THE UNIVERSITY OF QUEENSLAND, Brisbane, Australia; 2CSIRO, Clayton, Australia;
Type of Paper: Regular
Id Paper: 527
Topic: 6
Abstract:
Reactions between polycrystalline Ti3SixAl(1-x)C2 solid solutions (x = 0 - 1) and a Na3AlF6-AlF3-CaF2-Al2O3 electrolyte melt were studied using the immersion test method in argon at 960 and 1010 °C, respectively. Analyses of the tested samples by XRD and SEM-EDS showed that the Si was stable whereas the Al was leached out of crystal structure of the Ti3SixAl(1-x)C2 sample into the melt x = 0.2. Both Si and Al were leached out of the Ti3SixAl(1-x)C2 solid solutions at x ≠ 0.2 into the melt. A further XRD analysis of the tested Ti3SixAl(1-x)C2 samples at x ≠ 0.2 revealed that the leaching of both Si and Al of the solid solutions resulted in phase transformations of the hexagonal matrix phase to a phase similar to TiCσ (0 < σ < 1) due to the leaching of Si and Al atoms out of the basal plans of the crystalline phases into the melt. An inspection by SEM-EDX further revealed that the TiC-like phase exhibited finely grained textures and was chemically stable towards the melt. The mechanism of Ti3SixAl(1-x)C2/melt reactions and subsequent dissolution of the leached atoms into the melt is discussed in detail.