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Fabrication of insitu Cu/TiO2p Nanocomposite by Internal oxidation with Mechanical Alloying and Evaluation its Physical and Mechanical Properties

Moghannian, Amirhossein | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40957 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pourazarang, Kazem; Abachi, Parvin
  7. Abstract:
  8. Basically, it is required that the materials used as electrical contacts should have good thermal and electrical conductivity and certain strength. The copper base composites with fine TiO2 particles as reinforcement have almost identical electrical and thermal conductivity with copper; in addition, they have the advantage over pure copper in high strength owing to the dispersion of the fine TiO2 particles, which improve copper matrix strength through impeding dislocation movement. In this present work, at the initial stage, Cu and Ti powders were mechanically alloyed for 60h under Argon atmosphere, and then added Cu2O powders as oxidant. The specimens, containing different amounts of TiO2, depending on the content of 1, 2 and3 wt.% Ti, were produced by in-situ oxidation of Cu-Ti pre-alloyed powders. For compacting at the first step powders pressed under 30MPa pressure at 400°C then pressed at 400MPa in room temperature after that sintered at 800 °C for 1h under argon atmosphere. the microstructure of specimens were studied before and after internal oxidizing using SEM and XRD. Specific electrical resistance, density of specimens were evaluated. Also wearing resistance of specimens evaluated according to ASTM G-99 standard using pin-on-disk equipment at a sliding speed of 0.25m/s and normal load 20N, in distances of 1000, 2000 and 3000m. Chemical composition of Wear surface and Debris Were examined by EDAX Analysis. The Results indicated that wear rate of Cu/TiO2p nanocomposite decreased with increasing the amount of Ti in Cu-Ti pre-alloyed powder, while the specific electrical resistivity increased
  9. Keywords:
  10. Pin-On-Disk ; Internal Oxidation ; In-Situ Combustion ; Copper Base Nanocomposite ; Titaniume Oxide Reinforcement ; Wear Rate

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