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Title page for etd-0730104-142818


URN etd-0730104-142818 Statistics This thesis had been viewed 2588 times. Download 1120 times.
Author Cheng-wei Chiu
Author's Email Address hello.weiwei@msa.hinet.net
Department Materials Engineering
Year 2003 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 64
Title Fabrication of nano-TiN powder by pyrolysis conversion of TiO2 in a fluidized bed furnace
Keyword
  • nano-TIN
  • Fluidized bed
  • Fluidized bed
  • nano-TIN
  • Abstract Nano-structure TiN powders were prepared by using anatase-TiO2 and graphite mixtures as the precursor. Prior to thermal conversion, the mixture of TiO2 and graphite was milled in a high energy attritor to enhance the validity of carbothermic reduction. The nano-TiN powders were thermal converted by introducing N2 into a low pressure circulated fluidized-bed reactor which was previously evacuated to the pressure around 10-1 torr
    The formation of TiN compound is greatly enhanced by high-energy milling due to the reduced crystallite size, large grain boundary area, presence of amorphous phases and the increased defect concentration in the powder reactants given by the high-energy milling.
     Crystallites size of the powder mixtures decreased as increasing of milling time. The nano-TiN formation can be accomplished at a relatively low reaction temperatures and short reaction time via severe milling of TiO2 + graphite mixtures.
     The experiment results evidenced that the carbothermic reduction could not be occurred if the powder mixture of TiO2 + graphite had not been undergone a severe milling
    Advisor Committee
  • Fan-Shiong Chen - advisor
  • Files indicate access worldwide
    Date of Defense 2004-07-27 Date of Submission 2004-07-30


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