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Mechanical Properties of Al2O3-ZrO2 Nanocomposites Fabricated by Gelcasting

Arvandi, Shahab | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39014 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. Gelcasting is a new ceramic forming technique getting worldwide attention. The process is based on casting of slurry; containing powder, water and water-soluble organic monomers. The premix solution was prepared using Acrylamide as a monomer and Methylene bisacrylamide as a crosslinker with AM:MBAM ratio of 25:1, and Poly Acrylic Acid Sodium as a dispersant (1 wt% based on ceramic powders weight). A series of Al2O3/ZrO2 ceramic nanocomposites with 15, 17.5 and 20 wt% content of ZrO2 and 40, 43, 45, 47, 50, 53 and 55 vol.% of solid loading were fabricated by gelcasting. After casting the mixture, the monomer was polymerized to form gel parts. Drying, burning out and sintering completed the manufacturing route. The determined flexural strength of gelcast dried bodies changed between 9.93 and 28.51 MPa with increasing the solid loading of suspension from 40% to 53%. Flexural strength and fracture toughness of sintered bodies were also measured. Phase composition and microstructures of the dried and sintered samples were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed that increasing in zirconia content from 15 to 20 wt% slightly decreased flexural strength from 287 to 235.94 MPa and decreased hardness from 1420.4 to 1037.6 Vickers, but increased fracture toughness from 7.57 to 10.49 MPa.m1/2
  9. Keywords:
  10. Mechanical Properties ; Zirconia Thoughed Alumina (ZTA)Nanocomposite ; Gelcasting

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