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Fabrication and Mechanical Properties of Alumina- Zirconia- CNT Nanocomposite Parts

Soltani, Roghayeh | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40330 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali; Shakhesi, Saeeid
  7. Abstract:
  8. Alumina as an engineering ceramic has special characteristics such as hardness, high abrasive, fatigue and corrosion resistance but suffers from low toughness. One effective method in improving toughness is adding second phases such as tetragonal zirconia and carbon nanotubes.
    In this research, alumina- zirconia nanopowders has been prepared by solution combustion method and carbon nanotubes was added to it by two different ways: 1) in situ synthesis of CNTs by CVD 2) dispersion of CNTs by heterocoagulation method. In the case of in situ synthesis of CNTs in AZ matrix, the synthesis temperature and flow ratio of N2/C2H2 gases was investigated and optimum conditions were 800̊C and 300/30, respectively. For the purpose of homogenous dispersion of CNTs by heterocoagulation, three different values of CNTs (1,3,5 wt%) was added to AZ nanocomposite under sonication and in adjusted value of pH=4.2. The obtained powders were formed by CIP and sintered in H2 atmosphere. To characterize the products, X- ray difractometry, SEM, TEM,FTIR and raman spectroscopy were used. The hardness and toughness of sintered bodies were measured by Vickers indentation and showed 16% improvement in toughness in the case of AZ-1Wt% CNT nanocomposite. Further increasing of CNT, decreased the toughness.
  9. Keywords:
  10. Carbon Nanotubes ; Toughness ; Zirconia Thoughed Alumina (ZTA)Nanocomposite ; Combustion Synthesis ; In-Situ Synthesis ; Heterocoagulation

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