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URN etd-0814107-112821 Statistics This thesis had been viewed 3529 times. Download 2034 times. Author Shin-Yi Shen Author's Email Address No Public. Department Materials Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 108 Title Preparation of Al2O3 Fibers, SiC Fibers and Al2O3/SiC Composite Fibers from Carbon Fibers Keyword composite fibers sic fibers al2o3 fibers al2o3 fibers sic fibers composite fibers Abstract Alumina and silicon carbide fibers were prepared from carbon fibers or active carbon fibers by shape memory synthesis technique. The activated carbon fibers and carbon fibers were placed in a vacuum furnace with aluminum and heated at 1100℃ for 8 hours to form aluminum carbide. Then, the aluminum carbide fibers were oxidized in air at 1500℃ for 3 hours to convert aluminum carbide into aluminum oxide. The resulted alumina fibers had BET surface area as high as ~100 m2/g.
For the synthesis of silicon carbide fiber, carbon fibers were reacted with silicon powder in argon atmosphere at 1300℃ -1500℃ for 2-6 hours. The results showed that the thickness of hollow fibers increased with reaction temperature and reaction time. Solid silicon carbide fibers could be obtained after reaction at 1400℃ for 4 hours. Besides, the silicon carbide fibers were flexible. Combining these two processing methods could obtain silicon carbide / alumina core-shell composite fibers.
Structures with hierarchical pores distribution could be obtained using bio-templates. In this research, porous alumina ceramics were prepared from rattan-derived bio-carbon. These alumina ceramics retained the same microstructure as that of raw rattan with the pore structures corresponding to those of the original rattan, and the major pores being unidirectional connected.
Advisor Committee Yung-Jen Lin - advisor
Jiin-Jyh Shyu - co-chair
Files Date of Defense 2007-07-06 Date of Submission 2007-08-14