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Preparation and Characterization of Blocky Carbon Nanofibers and Carbon/Carbon Composites

Author: WangShaSha
Tutor: QiaoWenMing
School: East China University of Science and Technology
Course: Material Chemical Engineering
Keywords: Carbon Nanofibers Alloy catalyst C / C composites Friction properties Resistivity
CLC: TB332
Type: Master's thesis
Year: 2011
Downloads: 82
Quote: 0
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Abstract


This thesis ethylene as a carbon source , a Cu- Ni alloy as the catalyst , CVD method homemade mold prepared by a massive carbon nanofiber having a certain size . The experiments resulting product both linear -type nano- carbon fiber and spiral -type nano- carbon fiber, the diameter of the linear carbon nanofiber is about 100nm ~ 500nm, the diameter of the spiral -type nano- carbon fiber is about 100 nm . Its low degree of graphitization . It was found that the main factors affecting the yield and morphology of carbon nanofibers alloy catalyst Cu , Ni ratio of the amount of catalyst , reaction time and reaction temperature . The great influence of alloy catalyst Cu added to the growth of nano- carbon fiber . The presence of Cu improves the activity of the catalyst and the reaction time , helps to improve the yield of carbon nanofibers , With the addition of increasing the proportion of the carbon fibers of the spiral -type nano- improved product of the Cu content . Homemade massive CNFs reinforcement , phenolic resin the matrix precursor prepared C / C composites , phenolic resin - select the range of 45 to 60% concentration in ethanol solution . Prepared four kinds of the coefficient of friction of the C / C composite material are lower than 0.3, and decreasing with the phenolic resin - the increase in the concentration of the ethanol solution , the coefficient of friction of the material , the mass loss rate decreased, the wear resistance improvement of the material , when phenolic resins , - concentration of 60% ethanol solution , the coefficient of friction of the material 0.1068 . C / C composites of resistivity decreasing with the increase in the concentration of phenolic resin - ethanol solution , minimum of up 0.569Ω mm .

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