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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49202 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Faghihi Sani, Mohammad Ali; Mahdi Navaz Eghdam, Rouhoulah
- Abstract:
- Amorphous SiBNC ceramics have been developed as new high temperature materials. They show a high resistance against crystallization, high mechanical properties, low density, and high oxidation stability. Three synthesis methods have been developed for synthesis of SiBNC ceramics namely, Reactive magnetron sputtering, Mechanical alloying plus sintering, and polymer-derived ceramics. In this research among polymeric methods one pot synthesis due to high ceramic yield and high mechanical properties have been chosen. Two major methods for nanofiber preparation are Meltspinning and Electrospinng. It is notable that all of researches for SiBNC Nanofiber preparation has been conducted on Meltspinning. In this research Nanofibers of SiBNC has been prepared by Electrospinning for the first time. The influence of Electrospinning parameters on morphology of ceramic Nanofibers have been investigated.The optimum values of solution concentration, rate of solution flow and voltage are respectively 17 kv 25 l min , 40 weight percentage of DMTA in Dichloromethane have been determined. Changing the atmosphere of pyrolysis from Nitrogen to Argon raised the ceramic yield by 5 percent and increased the Nitrogen content in SiBNC ceramics
- Keywords:
- Electrospinning ; Nanofiber ; Ceramic Nanofiber ; Polymer-Derived Ceramic ; SIBNC Ceramic Fiber
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