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Investigation of the stress induced properties of coke during carbonization.

机译:碳化过程中焦炭应力诱导特性的研究。

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摘要

The large polycyclic aromatic plates within coal tar pitches do not flow freely enough to organize into large anisotropic domains during pyrolytic carbonization. It was hypothesized that mechanical shear stress might accomplish that orientation. To test the hypothesis a reactor and stirring mechanism were designed and constructed to test crystalline formation behavior during carbonization. The work shows a unique method for manipulating the crystalline structure of coke. The coke was derived from a coal tar pitch with an initial softening point of 147°C. During the pyrolytic devolatilization of the pitch, a shearing stress was applied mechanically. The stress promoted oriented texture in the direction of the applied stress as observed by polarized light microscopy. Powder x-ray diffraction was performed on the green coke samples. The crystalline intensity value was determined by integration of the diffraction intensity for the 002 peak of the amorphous green coke. The crystallite width, Lc, was calculated and found to be within 12 and 19 A. The insulating nature of the coke affected the temperature control system, which altered the thermal treatment of the samples. The optical results proved that the mechanically induced stress affected the pore size, shape, and anisotropic domain size. The texture of the coke ranged from fine lenticular to fine ribbon.
机译:煤焦油沥青中的大型多环芳香族板在热解碳化过程中没有足够的自由流动以组织成较大的各向异性区域。假设机械剪切应力可以完成该定向。为了检验该假设,设计并构造了反应器和搅拌机构以检验碳化期间的晶体形成行为。该作品显示了一种独特的方法来处理焦炭的晶体结构。焦炭来自煤焦油沥青,初始软化点为147°C。在沥青的热解挥发期间,机械地施加剪切应力。偏光显微镜观察到,应力在施加应力的方向上促进了定向织构。在生焦样品上进行粉末X射线衍射。结晶强度值是通过对非晶态绿色焦炭的002峰的衍射强度积分而确定的。计算出的微晶宽度Lc在12至19 A之内。焦炭的绝缘性质影响了温度控制系统,从而改变了样品的热处理。光学结果证明,机械诱导的应力会影响孔径,形状和各向异性畴尺寸。焦炭的质地从细小透镜状到细带状不等。

著录项

  • 作者

    Maybury, James Joshua.;

  • 作者单位

    West Virginia University.;

  • 授予单位 West Virginia University.;
  • 学科 Engineering Mechanical.;Engineering Materials Science.
  • 学位 M.S.M.E.
  • 年度 2007
  • 页码 116 p.
  • 总页数 116
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:39:45

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