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Title page for etd-0731105-164025


URN etd-0731105-164025 Statistics This thesis had been viewed 2770 times. Download 1245 times.
Author Yi-Hsiang Chiu
Author's Email Address monkey6739@yahoo.com.tw
Department Materials Engineering
Year 2004 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 89
Title The synthesis of porous SiC using bamboo as biotemplates
Keyword
  • porosity silicon carbide
  • porosity silicon carbide
  • Abstract The purpose of this research is to fabricate porous silicon carbide from bamboo. The bamboo first transforms into porous charcoal by carbonization in argon atmosphere. Gaseous Si was infiltrated into porous charcoal and reacted with solid charcoal to form SiC. Few SiC was produced on the surface below 1400℃ (the melting point of Si is 1410℃). More SiC was formed with increase of reaction time and temperature. The depth of reaction layer in the axial direction is 3.1 mm and 1.35 mm in the radial direction after reaction for 12 hr at 1500℃. Porous SiC preserves the structure of bamboo and has three distinct pore sizes of about 50 μm, 10-20 μm and 0.5 μm. The strut thickness is 2-3μm and the grain size is 0.5 μm. It has low density (bulk density : 1.03 g/cm3), high porosity (open porosity : 66.5 %) and the specific BET surface area is 18.5 m2/g. The flexural strength of porous SiC synthesized at 1500℃ for 8 hr are 12.8 ± 1.7 MPa in the axial direction and 42.5 ± 4.5 MPa in the radial direction. The compressive strength of porous SiC are 120 MPa in the axial direction and 75 MPa in the radial direction.
    Advisor Committee
  • none - advisor
  • none - co-chair
  • none - co-chair
  • Files indicate access worldwide
    Date of Defense 2005-06-16 Date of Submission 2005-07-31


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