Fabrication method and microstructural characteristics of coal-tar-pitchbased 2D carbon/carbon composites
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第2期
论文作者：Mohammad Esmaeeli Hamed Khosravi Alireza Mirhabibi
文章页码：210 - 216
摘 要：The lignin-cellulosic texture of wood was used to produce two-dimensional（2D） carbon/carbon（C/C） composites using coal tar pitch. Ash content tests were conducted to select two samples among the different kinds of woods present in Iran, including walnut, white poplar, cherry, willow, buttonwood, apricots, berry, and blue wood. Walnut and white poplar with ash contents of 1.994wt% and 0.351wt%, respectively, were selected. The behavior of these woods during pyrolysis was investigated by differential thermal analysis（DTA） and thermo gravimetric（TG） analysis. The bulk density and open porosity were measured after carbonization and densification. The microstructural characteristics of samples were investigated by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and Fourier-transform infrared（FT-IR） spectroscopy. The results indicate that the density of both the walnut and white poplar is increased, and the open porosity is decreased with the increasing number of carbonization cycles. The XRD patterns of the wood charcoal change gradually with increasing pyrolysis temperature, possibly as a result of the ultra-structural changes in the charcoal or the presence of carbonized coal tar pitch in the composite’s body.
Mohammad Esmaeeli1，Hamed Khosravi2，Alireza Mirhabibi1
1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology2. Faculty of Materials Science and Engineering, K. N. Toosi University of Technology
摘 要：The lignin-cellulosic texture of wood was used to produce two-dimensional（2D） carbon/carbon（C/C） composites using coal tar pitch. Ash content tests were conducted to select two samples among the different kinds of woods present in Iran, including walnut, white poplar, cherry, willow, buttonwood, apricots, berry, and blue wood. Walnut and white poplar with ash contents of 1.994wt% and 0.351wt%, respectively, were selected. The behavior of these woods during pyrolysis was investigated by differential thermal analysis（DTA） and thermo gravimetric（TG） analysis. The bulk density and open porosity were measured after carbonization and densification. The microstructural characteristics of samples were investigated by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and Fourier-transform infrared（FT-IR） spectroscopy. The results indicate that the density of both the walnut and white poplar is increased, and the open porosity is decreased with the increasing number of carbonization cycles. The XRD patterns of the wood charcoal change gradually with increasing pyrolysis temperature, possibly as a result of the ultra-structural changes in the charcoal or the presence of carbonized coal tar pitch in the composite’s body.
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