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The Effects of Alumina Mole Fraction on Morphology and Mechanical Properties of Ce-TZP/Al2O3 Nanocomposite Produced via Aqueous Combustion Synthesis

Vahdat, Armin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45001 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Yoozbashizadeh, Hossein
  7. Abstract:
  8. In the present study, nanocomposite of Ce-TZP/Al2O3 was synthesized via aqueous combustion synthesis. In order to investigate the effects of alumina on the morphology and the mechanical properties of this nanocomposite, four sample with 20, 40, 60 and 80 mole percent of alumina were prepared. At first, the synthesized powders were characterized with scanning electron microscope and X-ray diffraction technique. Then, in order to determine the effects of alumina mole percent on the mechanical properties of the nanocomposite, the powders were uniaxailly compacted with the press of 250 MPa followed by sintering at the temperature of 1400 °C for 4 hours. The density of the compacted powders was determined by archimedes method and then in order to measure the compressive strength of the samples the compressive strength test was applied. At last, the Vickers indentation mark which was created by the indenter was used to calculate the hardness and fracture toughness of the samples by mathematical relations. The results show that increasing the alumina mole fraction enhances the compressive strength and hardness of the prepared samples and reduces the fracture toughness of the nanocomposites. The sample containing 80 mole percent alumina had the highest hardness and compressive strength of all which was 300 and 29 Mpa, respectively, and also this sample had the lowest fracture toughness between all the prepared samples
  9. Keywords:
  10. Aqueous Combustion Synthesis ; Mechanical Properties ; Scanning Electron Microscopy (SEM) ; X Ray Diffraction ; Alumina-Zirconia-Ceria Nanocomposite

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