Announcement for Downloading full text filePlease respect the Copyright Act.
All digital full text dissertation and theses from this website are authorized the copyright owners. These copyrighted full-text dissertation and theses can be only used for academic, research and non-commercial purposes. Users of this website can search, read, and print for personal usage. In respect of the Copyright Act of the Republic of China, please do not reproduce, distribute, change, or edit the content of these dissertations and theses without any permission. Please do not create any work based upon a pre-existing work by reproduction, Adaptation, Distribution or other means.
URN etd-0730104-142818 Statistics This thesis had been viewed 3144 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