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Synthesis and characterization of Al2O3–ZrO2 nanocomposite powder by sucrose process

  • A. BeitollahiEmail author
  • H. Hosseini-Bay
  • H. Sarpoolaki
Article

Abstract

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.

Keywords

Zirconia Boehmite Simultaneous Thermal Analysis Zirconia Particle Nanocomposite Powder 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

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.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Nanomaterials Group, Department of Metallurgy and Materials EngineeringIran University of Science and Technology (IUST)TehranIran

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