Abstract
Results are presented for the reaction of aluminium metal with zirconia ceramics under (reducing) sintering conditions. Aluminothermic reduction is a form of self-sustaining high-temperature synthesis (SHS). During reaction the principal phase formed is zirconium monoxide which is shown to have a rock-salt cubic structure and a unit-cell dimension of 0.46258nm.
When a yttria partially-stabilised zirconia is used as starting material, composite structures of ZrO, alumina and cubic zirconia are produced which are the result of reduction reactions which proceed through the liquid metal phase. The results are interpreted through X-ray diffraction, microstructural and phase equilibria considerations which show that the sintering gas also plays a role in reaction through the oxygen partial pressure.
The results allow calculation of an approximate value of the free energy of formation of zirconium monoxide (-294,500J.mol-1) which is consistent with the reported values for the monatomic carbide and nitride of zirconium and with other similar transition metal carbide, nitride and monoxide series.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
R Stevens, “An introduction to zirconia”, MEL Publication No 113 (Magnesium Elektron; Manchester England) 1983
EP Butler, “Transformation toughened zirconia ceramics”, Materials Sci & Tech, 1, 417. 1985.
JR Singh, RB Poeppel, JJ James & JJ Picciolo, “Microstructural development of refractory composites with improved fracture toughness”, in Microstructure & Properties of Refractories, Eds JR Singh & S Banerjee, Key Engineering Materials, 88, (Trans Tech Publications; Aedermansdorf, Switzerland) p 103. 1993.
X Zhe & A Hendry, “In situ synthesis of hard and conductive ceramic composites from Al and ZrO2 mixtures by reaction hot nressing” I Mater Sci Letters 17 687 1998
X Zhe, LM Watson & A Hendry, “Formation of meta-stable zirconium monoxide during thermite reaction hot pressing” in Proc of 4th Int Conf on SHS, Ed MA Rodriguez, (ICV; Madrid, Spain), 1997.
X Zhe, “Novel zirconium oxide-based ceramic composites”, PhD Thesis, University of Strathclyde, 1999.
K Liddell, (1996), University of Newcastle upon Tyne. Unpublished work.
RJ Aschermann, SP Garg & EG Rauh, “High temperature phase diagram of the system Zr-O”, JAm Cer Soc, 60, 341, 1977.
OA Kubaschewski, “Metallurgical Thermochemistry”, (Pergamon Press: London) 1979.
“Phase Diagrams for Ceramists”, Eds EM Levin & HF McMurdie, (American Ceramic Society; Columbus, Ohio, USA), Figure 4377, 1975.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2004 Springer Science+Business Media New York
About this paper
Cite this paper
Zhe, X., Dioka, C.A., Hendry, A. (2004). Aluminothermic Reduction of Zirconia. In: Yan, XT., Jiang, CY., Juster, N.P. (eds) Perspectives from Europe and Asia on Engineering Design and Manufacture. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2212-8_33
Download citation
DOI: https://doi.org/10.1007/978-1-4020-2212-8_33
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-015-7003-9
Online ISBN: 978-1-4020-2212-8
eBook Packages: Springer Book Archive