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Sintering of Molybdenum Disilicide Produced by Mechano-Chemical Process

Moosapour Siahkalroudi, Zahra | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45165 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Yoozbashizadeh, Hossein
  7. Abstract:
  8. Molybdenum disilicide is an intermetallic compound in Mo-Si binary system that is appropriate to use at high temperatures. Because of its special properties such as high melting point, oxidation resistance, good electrical resistivity and thermal conductivity, this material can be used in high temperatures applications such as gas turbines, heat shield and tiles. High melting point of MoSi2 limits the fabrication of this compound by conventional methods. Nowadays modern techniques such as mechanical alloying are being used for synthesis of Molybdenum disilicide. The objective of this study is to investigate the effects of sintering time and temperature on the mechanical and electrical properties of Molybdenum disilicide produced by mechano-chemical process. In this study, the density, bending strength, compressive strength, hardness and toughness tests were used to investigate the mechanical properties and electrical resistivity were used to the electrical properties also the micro structure changes and morphological investigation were analyzed by Scanning Electron Microscope. According to the results, it was observed that generally, mechanical and electrical properties was improved with increasing sintering time from 2 hours to 5 hours. But in relation to temperature, various factors such as growth grain size and the phase of the glass in the same high temperatures will be reduced some properties. Generally, according to the same grading size, the best temperature for sintering obtained at 1300 ° C
  9. Keywords:
  10. Molybdenum Di Silicide (MoSi2) ; Mechanical Alloying ; Sintering ; Mechanochemical Alloying Process

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