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Preparation of Cu-MoSi2 Nanocomposite by Mechanical Alloying and Investigation of Properties

Khavas, Elham | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49431 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pourazarang, Kazem; Abachi, Parvin
  7. Abstract:
  8. In this study, to synthesize molybdenum disilicide nano powder, mixed powder of Mo and Si were ball milled for 15, 30, 45 and 55 hours. By the results of the analyses, milled powders for time intervals of 55 hours were heat treated to release the stresses. This process was carried out in an argon vacuum tube furnace at 1000˚C for 1 hour. XRD analysis was carried for sample. Finally, MoSi2 powder with 86.62 nm crystallite size was used as reinforcement. Cu-MoSi2 composite powder with 2, 3, 5wt% were produced. Cu-MoSi2 with 2wt% reinforcement was milled for 60 hours. Powder composite was compacted by Spark Plasma Sintering . Microstructure of composite was investigated by scanning electron microscopy (SEM). Finally, the density, specific electrical resistance, hardness values were determined. Pin on disk were test with applied load of 20, 50, 80 N and sliding speed of 0.4 m/s in 200, 400, 600, 1000 m distances were performed. Increasing of reinforcement percentage will result in decreasing density, increasing specific electrical resistance and hardness in compare with pure copper. Ball milled composite has highest hardness value (79.39 Hv) and lowest density (76%). The best wearing resistance was obtained for Cu-3vol.%MoSi2
  9. Keywords:
  10. Molybdenum Di Silicide (MoSi2) ; Mechanical Alloying ; Spark Plasma Sintering ; Copper-Molybdenum-Silicon Nanocomposite

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