X-RAY-DIFFRACTION, THERMAL-EXPANSION, ELECTRICAL-CONDUCTIVITY, AND OPTICAL MICROSCOPY STUDIES OF COAL-BASED GRAPHITES
X-RAY-DIFFRACTION, THERMAL-EXPANSION, ELECTRICAL-CONDUCTIVITY, AND OPTICAL MICROSCOPY STUDIES OF COAL-BASED GRAPHITES
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DOI：
10.1016/0008-6223(93)90109-n
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发表时间：
1993-01-01
期刊：
影响因子：
10.9
通讯作者：
PAVLOVIC, AS
中科院分区：
文献类型：
--
作者：
SEEHRA, MS;PAVLOVIC, AS
本文报道了以溶剂抽提煤为原料制备的三种石墨(WVU-1、WVU-2、WVU-3)的性质。用X射线衍射、热膨胀、电导和光学显微镜等技术进行了测量。测定的参数包括晶体尺寸L(C)和L(垂直)，晶胞参数d(002)，贝肯各向异性参数，晶格应变，石墨化度，纵向和横向热膨胀系数，电导率和密度。该项目的长期目标是生产一种性能与H-451相当的煤基各向同性石墨，H-451是一种从石油焦原料中生产的商业可用石墨。因此，将WVU石墨的性能与H-451的性能进行了比较，并选择了一种高纯石墨粉作为参考。这些对比表明，WVU-1和WVU-3石墨的X射线和CTE各向异性比与H-451相当。然而，由于用于煤原料的加氢工艺，WVU-2具有更强的各向异性。三种WVU石墨的电导率约为H-451的一半。WVU石墨的低电导率和低密度是由于没有浸渍，这一步骤需要在未来的样品制备中包括在内。
In this work, the properties of three graphites (WVU-1, WVU-2, WVU-3) produced from solvent-extracted coal feedstocks are reported. The techniques of x-ray diffraction, thermal expansion, electrical conductivity, and optical microscopy were used for these measurements. Parameters determined include crystallite sizes L(c) and L(perpendicular-to), crystalline parameter d(002), Bacon anisotropy parameter, lattice strain, degree of graphitization, longitudinal and transverse coefficients of thermal expansion (CTE), electrical conductivity and density. The long-range goal of this project is to produce a coal-based isotropic graphite comparable in properties to H-451, a commercially available graphite produced from petrocoke feedstocks. Therefore, the properties of the WVU graphites are compared to those of H-451, and a high-purity graphite powder is included in this study for reference. These comparisons show that the x-ray and the CTE anisotropy ratios of the WVU-1 and WVU-3 graphites are comparable to those of H-451. However, WVU-2 is more anisotropic because of the hydrogenation process used for the coal feedstock. The electrical conductivities of the three WVU graphites are about half that of H-451. The lower conductivities and lower densities of the WVU graphites are due to lack of impregnation, a step which needs to be included in future sample preparations.