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Characterization of the FFC Cambridge process for NiTi production using in situ X-Ray synchrotron diffraction
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Jackson, B. K., Dye, D., Inman, D., Bhagat, Rohit, Talling, R. J., Raghunathan, S. L., Jackson, M. and Dashwood, R. J. (2010) Characterization of the FFC Cambridge process for NiTi production using in situ X-Ray synchrotron diffraction. Journal of The Electrochemical Society, Vol.157 (No.4). E57-E63. doi:10.1149/1.3299369 ISSN 0013-4651.
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Official URL: http://dx.doi.org/10.1149/1.3299369
Abstract
To date, the characterization of the reduction pathway for the Fray Farthing Chen (FFC) Cambridge process has been achieved through ex situ studies, leading to some ambiguities. This study employs a synchrotron X-ray diffraction technique to monitor in situ the FFC reduction of NiTiO3 to NiTi, yielding an unmatched level of detail on the electrochemical and chemical reactions involved. The reduction pathway consists of rapid initial reduction of NiTiO3 to form CaTiO3 and Ni, then the transformation of Ni to Ni3Ti, and finally the consumption of CaTiO3 and Ni3Ti to produce NiTi. The phases observed agree with thermodynamic predictions [J. Electrochem. Soc., 155, E171 (2008)] and allow the mapping of the reduction pathway on an electrochemical predominance diagram. Ni3Ti is a short-lived transient phase in the reduction pathway. Ni3Ti was found in significant quantities in ex situ studies [J. Electrochem. Soc., 155, E171 (2008); Chin. Sci. Bull., 51, 2535 (2006)]. The authors propose that Ni3Ti forms during furnace cooling to ambient temperature if extracted before a complete reduction. Neither Ni2Ti4O nor CaO was observed. The progression of the reduction front is clearly in line with existing observations and models [Metall. Mater. Trans., B, Process Metall. Mater. Proc. Sci., 35, 223 (2004); J. Phys. Chem. B, 109, 14043 (2005)].
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
| Journal or Publication Title: | Journal of The Electrochemical Society | ||||
| Publisher: | Electrochemical Society, Inc. | ||||
| ISSN: | 0013-4651 | ||||
| Official Date: | 17 February 2010 | ||||
| Dates: |
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| Volume: | Vol.157 | ||||
| Number: | No.4 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | E57-E63 | ||||
| DOI: | 10.1149/1.3299369 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Metalysis Ltd. |
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