Effects of the time of combined vibration grinding and the compacting pressure on the density and shrinkage of graphite MPG-7 workpieces

Timoshchuk, E. V.; Samoilov, V. M.; Timoshchuk, E. I.; Smirnov, V. K.

doi:10.3103/s0361521911010137

Cited by 2 publications

(3 citation statements)

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“…It is well known that cokes usually contain several structural components of different types [10,[48][49][50][51], which leads to the production of a micro-homogeneous material and, accordingly, to high variations in the parameters of Raman spectroscopy. As for graphite MPG-7, its production is associated with the use of coke filler and high-temperature pitch binder, the mixture of which is subjected to deep mechanochemical treatment [10,[49][50][51][52]. After pressing and hightemperature treatment, the final material also has at least two microstructural components [47,[49][50][51][52] and is also micro-homogeneous to a degree even higher than the original coke filler (see Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…As for graphite MPG-7, its production is associated with the use of coke filler and high-temperature pitch binder, the mixture of which is subjected to deep mechanochemical treatment [10,[49][50][51][52]. After pressing and hightemperature treatment, the final material also has at least two microstructural components [47,[49][50][51][52] and is also micro-homogeneous to a degree even higher than the original coke filler (see Table 1).…”

Section: Resultsmentioning

confidence: 99%

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Effective Heat Treatment Temperature of Carbon Materials in High Temperature Furnaces: Determination by the Parameters of Raman Spectroscopy of Witness Samples

Samoilov

Nakhodnova

Osmova

et al. 2021

Inorg. Mater. Appl. Res.

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Correlation dependences of the Raman spectroscopy parameters of carbon materials on the heat treatment temperature (HTT) are obtained. It is proposed to use the ratio of the integral intensities of the bands D and G, I D /I G , to obtain the most accurate and reproducible results. The choice of carbon fiber (CF) based on polyacrylonitrile (PAN) as witness samples is experimentally justified. It is shown that, for the studied PAN-based CF samples after heat treatment in the treatment temperature range of 1000-3000°C, the parameter I D /I G correlates well with the parameters of X-ray diffraction analysis. A number of examples of the application of the Raman spectroscopy method of witness samples are considered for determination of the "effective" HTT of carbon materials in technological processes for the production of carbon-carbon composite materials, artificial graphite, and PAN-based CF, as well as determination of the temperature fields of both laboratory and industrial equipment designed for high temperature treatment of carbon materials in the temperature range of 1000-3000°C, in particular, in Tamman furnaces, resistance electric vacuum furnaces, and Acheson furnaces.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effective Heat Treatment Temperature of Carbon Materials in High Temperature Furnaces: Determination by the Parameters of Raman Spectroscopy of Witness Samples

Samoilov

Nakhodnova

Osmova

et al. 2021

Inorg. Mater. Appl. Res.

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“…At present, research of various sorts is being carried out with the use of mechanical activation of graphite for producing lithium ion batteries [2], supercapaci tors [3], composites for hydrogen storage [4], catalytic systems [5,6], high reactivity Me/C nanocomposites [7], and double carbides for improving the properties of high temperature alloys [8], and new coal graphite materials are being developed [9,10]. This list can, undoubtedly, be substantially widened.…”

Section: Introductionmentioning

confidence: 99%

The effect of the mechanical activation dose on the defective structure of artificial graphite

et al. 2015

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Energy parameters (dose D and the work of surface formation) have been determined for the for mation of a defective structure as a result of mechanical activation of graphite. Graphite activation has been shown to be a two stage process: at low doses (D ≤ 20 kJ/g), the disruption and shift of graphite particles are the main processes, which are accompanied by a reduction in particle size, formation of meso and micropores, and a rise in the BET specific surface area to 450-550 m 2 /g predominantly due to the develop ment of a slitlike mesoporosity. At the same time, the crystalline structure of graphite is transformed into a turbostrate one with a concomitant increase in the lattice parameter and a decrease in the sizes of coherent scattering regions. The shape of diffraction lines can be described under the assumption that several fractions with greatly different degrees of defectiveness coexist in graphite. At higher doses, turbostrate graphite is transformed into X ray amorphous carbon with a concomitant decrease in the specific surface area and meso and microporosity. The defects resulting from the mechanical activation cannot be completely annealed at 2800°C. The main parameter of mechanical activation is the dose of supplied energy D = J g t (J g is the specific power consumption, and t is the duration of the activation). The curves describing accumulation of different defects can be represented in the form of a unified dependence on the dose for the J g and, accordingly, t values varied by more than an order of magnitude (J g = 1.7-22 W/g).

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Effects of the time of combined vibration grinding and the compacting pressure on the density and shrinkage of graphite MPG-7 workpieces

Cited by 2 publications

References 1 publication

Effective Heat Treatment Temperature of Carbon Materials in High Temperature Furnaces: Determination by the Parameters of Raman Spectroscopy of Witness Samples

Effective Heat Treatment Temperature of Carbon Materials in High Temperature Furnaces: Determination by the Parameters of Raman Spectroscopy of Witness Samples

The effect of the mechanical activation dose on the defective structure of artificial graphite

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