Jackson, Ben, Jackson, Martin, Dye, D., Inman, D. and Dashwood, R. J.. (2008) Production of NiTi via the FFC Cambridge process. Journal of The Electrochemical Society, Vol.155 (No.12). E171-E177. ISSN 0013-4651

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Abstract

The FFC Cambridge process is a direct electrodeoxidation process used to reduce metal oxides to their constituent metals in a molten CaCl2 salt bath. NiTiO3 was used as a precursor (the first stable oxide to form upon blending and sintering NiO and TiO2 powders) and was successfully reduced using the FFC Cambridge process at 1173 K and a constant cell voltage of -3.1 V to produce a NiTi alloy. This work builds on the literature work [Chinese Science Bulletin, 51, 2535 (2006)] through: (i) a predominance diagram calculated to show the regions of phase stability throughout the usable potential window of the CaCl2 salt; (ii) the investigation of a wide range of reduction times for a fixed cell voltage, elucidating several additional stable phases, to yield a complete and detailed reduction pathway. The reduction pathway for NiTiO3 was identified through the analysis of a series of partial reductions, with fully reduced NiTi formed after a period of 24 h. The first stage of the reaction involved the rapid formation of Ni and CaTiO3. The reduction then proceeded via the formation of the intermediate compounds Ni3Ti and Ni2Ti4O. All the NiTiO3 and Ni were consumed after a period of 6 h, while the intermediate compounds remained until the reaction was near completion. The experimental results related well to the thermodynamic predictions of the predominance diagram. A small variation in stoichiometry of the produced NiTi observed from the edge to the core of the samples was attributed to redeposition of Ti on the sample surface from the salt and a slightly Ti-rich NiTiO3 precursor material. (c) 2008 The Electrochemical Society. [DOI: 10.1149/1.2987739] All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	Journal of The Electrochemical Society
Publisher:	Electrochemical Society, Inc.
ISSN:	0013-4651
Date:	7 October 2008
Volume:	Vol.155
Number:	No.12
Number of Pages:	7
Page Range:	E171-E177
Identification Number:	10.1149/1.2987739
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/29071

Data sourced from Thomson Reuters' Web of Knowledge

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