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NiTi production via the FFC Cambridge process: refinement of process parameters

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Jackson, B. K., Inman, D., Jackson, M., Dye, D. and Dashwood, R. J. (2010) NiTi production via the FFC Cambridge process: refinement of process parameters. Journal of The Electrochemical Society, Vol.157 (No.3). E36-E43. doi:10.1149/1.3289996

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Official URL: http://dx.doi.org/10.1149/1.3289996

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Abstract

The electrochemical FFC Cambridge process is well suited for NiTi production as it avoids the Ni segregation associated with conventional manufacturing routes. A homogeneous low oxygen product can be produced through the direct electro-deoxidation of the mixed metal oxides in a molten CaCl2 salt bath. This work builds on previous literature concerning the reduction of NiTi [J. Electrochem. Soc., 155, E171 (2008); Chin. Sci. Bull., 51, 2535 (2006)] through the investigation of the effects of reduction temperature and the materials of construction on the phases formed. Previous work has shown that the use of a Ti cathodic current collector gave Ti enrichment, forming monoclinic B19(') monoclinic NiTi at ambient temperature [J. Electrochem. Soc., 155, E171 (2008)]. The use of a Ni current collector caused Ni enrichment in the product, stabilizing the high temperature B2 cubic form at ambient temperature. This was true for all reductions carried out from 1173 to 1273 K, but for 1123 K and below, monoclinic B19(') NiTi was formed. A NiTi current collector yielded Ni enrichment producing B2 cubic NiTi at ambient temperature. Mechanisms for the formation of these phases were proposed. The work also detailed the importance of good cell design and how sealing quality can dramatically affect the homogeneity of the products.

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, 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: 25 January 2010
Dates:
DateEvent
25 January 2010Published
Volume: Vol.157
Number: No.3
Number of Pages: 8
Page Range: E36-E43
DOI: 10.1149/1.3289996
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), Materials Knowledge Transfer Network, Metalysis Ltd.

Data sourced from Thomson Reuters' Web of Knowledge

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