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Synthesis, characterization and tribological properties of silicon carbide derived carbon layer 원문보기

  • 저자

    정민군

  • 학위수여기관

    Graduate School, Korea University

  • 학위구분

    국내박사

  • 학과

    신소재공학과

  • 지도교수

    임대순

  • 발행년도

    2014

  • 총페이지

    xii, 127장

  • 키워드

    carbon tribology;

  • 언어

    eng

  • 원문 URL

    http://www.riss.kr/link?id=T13541933&outLink=K  

  • 초록

    In the first part, Nanostructured carbide-derived carbons (CDCs) were synthesized from hexagonal SiC (α-SiC) and cubic SiC (β-SiC) powders via chlorination at temperatures between 900 and 1200 °C. The content of the sp2- and sp3-bonded carbon phases and their crystallinity were analyzed by Raman spectroscopy. The nanocrystalline phases of the synthesized CDCs were observed and characterized by transmission electron microscopy and electron energy-loss spectroscopy. Mechanical properties were measured with tribological tests. The morphology of CDCs showed interesting features that varied with the starting SiC powder. Diamond nanocrystals were more frequently observed in α-SiC-derived carbons than in β-SiC-derived carbons, and the rate of graphitization was affected by the SiC polytype, synthesis temperature and hydrogen content. A possible mechanism responsible for the observed results was also investigated. In the second part, carbide derived carbon layers were synthesized on silicon carbide with two different halogen reactants of chlorine gas and vaporized chloroform via chlorination time and temperature. The influence of the chlorination as a reactant on the carbon structure was analyzed with X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. Pore morphology and specific surface area was resolved using surface area and porosity analyzer. Tribological properties were measured with pin-on disk type tribometer. Chloroform treated CDCs overcome the present limitations and showed enhancement on properties. The surface roughness was greatly increased due to the chemical bond between CDC and decomposed chloroform. Consequently decrease of specific surface area and more graphitization was also observed, and the mechanical properties related on tribological properties were greatly improved.


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