Pressing and Sintering of Ce-Tzp-Al¬2o3 Nanocomposite with a High Percent of Alumina And Investigation of Sinter Condition on Morphology

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Ameri Shahrabi, Hadi | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 44201 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Yoozbashizadeh, Hossein
Abstract:
In this project alumina-zirconia-ceria nanocomposite with 80% mol alumina (0.2Ce0.1Zr0.9O2-0.8Al2O3) was produced by solution combustion synthesis method. In the mentioned method, optimal fuel with composition of 75% urea, 25% ammonium acetate, and stoichiometric amount of glycine (0.75U-0.25AA-1G) was used. Moreover, ammonium nitrate as aid combustion was added to optimal fuel. In order to calcinations, nanopowder obtained from combustion synthesis was heated to 500°C for 1 hour and kept at this temperature for 2 hours. To complete heat treatment, the nanopowder was heated to 1150°C for 2 hours and 10 min and kept at this temperature for 2 hours. Then the specimens were pressed at pressure of 200, 300, and 400MPa. The obtained specimens were sintered at temperature of 1350, 1400, and 1450°C for 2, 3, and 4 hours. Phase assessments were done by XRD pattern. In addition, morphology of specimens was examined by means of SEM. Final stage sintering was observed for specimens heated at 1450°C for 4 hours
Keywords:
Aqueous Combustion Synthesis ; Alumina-Zirconia-Ceria Nanocomposite ; Presses ; Sintering ; X Ray Diffraction ; Scanning Electron Microscopy (SEM)

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