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Butyrin G.M.,Research Institute of Structural Graphite Materials
Solid Fuel Chemistry | Year: 2015

The results of the statistical processing of data on the determination of the apparent (ρa) and pycnometric (ρp) densities and the accessible (open) porosity (Pa) of samples cut out in parallel (||) and perpendicularly (⊥) to the axis of extrusion of the workpieces of fine-grained graphites (>90% of coke filler particles of size<90 μm) are reported. It is shown that, for graphites based on uncalcined petroleum coke and medium- and high-temperature coal tar pitch, ρa ⊥> ρa || by 1.2% (0.019 g/cm3) and Pa ⊥ < Pa || by 3.3% (0.9% in the absolute value) or by 1.3% (0.024 g/cm3) and (0.92%), respectively, for the same graphite with high-temperature pitch. The capabilities of mercury porosimetry in the study of the porous structure of graphites and other carbon materials are demonstrated. © 2015, Allerton Press, Inc. Source


Timoshchuk E.V.,Research Institute of Structural Graphite Materials | Samoilov V.M.,Research Institute of Structural Graphite Materials | Timoshchuk E.I.,Research Institute of Structural Graphite Materials | Smirnov V.K.,Research Institute of Structural Graphite Materials
Solid Fuel Chemistry | Year: 2011

A technique for the manufacturing of graphite MPG-7 was developed on a laboratory scale with the use of the following new raw materials: uncalcined isotropic shale tar coke and three high-temperature pitches. The caking capacity and density of the test samples of MPG-7 after molding, burning, and graphitizing were determined. It was found that the optimum concentration of a binding agent determined from the caking capacity decreased from 40 to 28% as the volatile matter content of coke increased from 4.5 to 9.5% and the softening temperature of pitch decreased from 148 to 135°C. In this case, the total shrinkages of the test samples decreased from 60 to 54%, and their densities decreased from 1.98 to 1.76 g/cm3. The optimum time of combined vibration grinding was determined, and the range of compacting pressures was chosen. The relationships between the densities of the test samples burned under laboratory and production conditions, as well as between the densities of burned and graphitized samples, were obtained. These relationships make it possible to predict the density level of MPG-7 material reached under plant conditions. © 2011 Allerton Press, Inc. Source


Beilina N.Yu.,Research Institute of Structural Graphite Materials | Lipkina N.V.,Research Institute of Structural Graphite Materials | Starichenko N.S.,Research Institute of Structural Graphite Materials | Ostrovskii D.V.,Research Institute of Structural Graphite Materials | Ostrovskii V.S.,Research Institute of Structural Graphite Materials
Solid Fuel Chemistry | Year: 2011

Data on the caking capacity of composites containing cokes of various origins and coal-tar pitches are summarized. It was demonstrated that the yield of coke from pitch can serve as a value characterizing the caking capacity of the composites. The effect of the porosity of a filling agent on the caking capacity was found. © 2011 Allerton Press, Inc. Source

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