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Investigation Hydrogen Properties of Nano Composite MgH2-Ti Cr1.2Fe0.6 Nano Crystalline Synthesized by Mechanical Alloying and Vacuum Arc Re-Melting(VAR)

Mahmoudi, Nafiseh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40243 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdol Reza
  7. Abstract:
  8. In this research, nano composite MgH2-TiCr1.2 Fe0.6 nano crystalline was synthesized by mechanical alloying and Vacuum arc re-melting (VAR). the effect of Milling conditions and adding nano crystalline TiCr1.2 Fe0.6 as a catalyst on the structure and hydrogen desorption properties of MgH2 were studied. MgH2 powder grain size after 4 hours milling gained to 15nm and strain network reached to 0.8%. Determined that the increasing of accumulated lattice strain because of mechanical milling combined with adding nano crystalline alloy TiCr1.2 Fe0.6 significantly improve the properties of MgH2 hydrogen desorption. After an hour mill working, high pressure phase of γ-MgH2 was appeared in structure. Indicated that Pre alloyed nano composite which has been synthesized with VAR method because of crystally structure (not amorphous), has better hydrogenous properties than the powder nano composite so that the temperature of hydrogen desorption in pre alloyed nano composite which has been milled 4 hours gained to 241° C and the maximum percentage of hydrogen desorption in powder nano composite sample gained to 5.5%wt. Pre alloyed nano composite grain size after 4hours mechanical milling work gained about 7nm and network strain to 0.7%.

  9. Keywords:
  10. Hydrogen Storage ; Magnesium Hydride ; Nanocomposite ; Mechanical Alloying ; Fuel Cell ; Vacuum Arc Re-Melting

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