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The Synthesis of Sialon Nano Particles by Sol- Gel Procedure and Investigation of Properties of its Erosion

Fathi, Hamed | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45137 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Halali, Mohammad
  7. Abstract:
  8. Sialons are materials which crystallize in four elements system (Si-Al-O-N). These materials have been widely observed by researchers because of their suitable properties like: high toughness and strength in high temperatures, high resistance to corrosion and stability in thermal shock. Because of these properties,Sialons are anti erosion materials. In this research, by controling the situations, mullite has been synthesized by sol-gel procedure. Then the powder has been ground by ballmill for 12 hours and by spex for 30 minutes. Then the produced powder was mixed with distinct amount of graphite and nano silica and was nitrided in the furnace at 1500 ̊C and was heated for 5 hours. Also the effect of graphite content in 18 and 27 percent in formation of Sialon has been observed. Structure properties have been tested by XRD and SEM and erosion and strength properties and density of samples have been investigated. It was seen that the particle size of the powder that has been ground by spex,is smaller than that of the other powders and also it produces more Sialon. The powder with 18% graphite in comparison to the powder with 27% Graphite, produced more Sialon. The results from XRD patterns and SEM revealed that the particle size of Sialon was nano. Also it has been seen that by increasing the percent of Sialon, strength, density and resistant to erosion have been increased
  9. Keywords:
  10. Synthesis ; Mullite ; Sol-Gel Method ; Nanoparticles ; Sialon

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