Synthesis and characterization of Al2O3–ZrO2 nanocomposite powder by sucrose process
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Nanocrystalline alumina–zirconia powders were prepared by a modified chemical route using sucrose, polyvinyl alcohol (PVA) and metal nitrates followed by a post calcination process. The process involved dehydration of Al3+–Zr4+ ions-sucrose–PVA solution to a highly viscous liquid which on decomposition process produced a black precursor material. The obtained precursor were then calcined at various temperatures: 1,050, 1,100, 1,150, 1,200 and 1,250 °C for different soaking times (1, 2, 4 h) in air. The formation of a nanocomposite composed of α-alumina (~20 nm) and tetragonal (t) zirconia (~19 nm) crystallites were confirmed for the sample calcined at 1,200 °C for 2 h, based on our XRD and TEM results. However, for the samples calcined below 1,150 °C the composite formed were composed of metastable alumina (γ, δ, θ) as well as t-zirconia phases. Interestingly, the zirconia phase retained its tetragonal structure for all the samples calcined above 1,050 °C. This is possibly related to the “size effect” and reduction of surface enthalpy of the zirconia crystallites surrounded by Al3+ cations.
KeywordsZirconia Boehmite Simultaneous Thermal Analysis Zirconia Particle Nanocomposite Powder
We would like to acknowledge the help of Nanomaterials Group, Advanced Materials Research Center (AMRC), IUST. Further, the support of Iranian Nanotechnology Initiative Council (INIC) is also acknowledged.
- 1.G.H. Beall, L.R. Pinckney, J. Am. Ceram. Soc. 82, 5 (1999)Google Scholar
- 3.H. Singh Nalwa, Nanostructured materials and nanotechnology (Academic Press, London, 2002)Google Scholar
- 8.F.L. Matthews, R.D. Rawlings, Composite materials: engineering and science (Chapman and Hall, London, 1994), p. 137Google Scholar
- 16.J.A. Gadsden, Infrared spectra of minerals and related inorganic compounds (Butterworth, London, 1975), p. 193Google Scholar
- 17.K. Wefers, C. Misra, Oxides and hydroxides of aluminium, (ALCOA Technical pap No. 19 Rev., ALCOA Labs, 1987)Google Scholar
- 19.W.D. Kingery, H.K. Bowen, D.R. Uhlmann, Introduction to ceramics, 2nd edn. (Wiley, New York, 1976)Google Scholar
- 23.S. Moreau, M. Geravais, A. Douy, Solid State Ionics 625, 101–103 (1997)Google Scholar
- 27.S. Kikkawa, A. Kijima, K. Hirota, O. Yamamoto, J. Am. Ceram. Soc. 85, 721 (2002)Google Scholar
- 31.R.C. Garvie, J. Am. Chem. Soc. 82, 218 (1978)Google Scholar
- 34.V.V. Srdic, M. Winterer, H. Hahn, J. Am. Ceram. Soc. 83, 1853 (2000)Google Scholar