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URN etd-0730104-142818 Statistics This thesis had been viewed 2588 times. Download 1120 times. Author Cheng-wei Chiu Author's Email Address email@example.com 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 Date of Defense 2004-07-27 Date of Submission 2004-07-30