Mechanical properties of pitch-coal extrudates during the carbonization process☆

Henning, K.; Bongartz, W.; Knoblauch, K.

doi:10.1016/0016-2361(87)90009-3

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…The chemical composition of the fibers (measured on the axial surface of the samples by EDXA) taken at different positions during the carbonization showed that the oxygen was mainly released in the temperature interval between 300 and 1000 °C (see Table ), where pyrolysis gave rise to CO 2 and CO, and the further formation of an amorphous structure at the higher temperatures released CO . The sulfur present in small amounts in the stabilized fibers seemed to be difficult to remove at the temperatures used here.…”

Section: Resultsmentioning

confidence: 86%

Development of lignin carbon fibers: Evaluation of the carbonization process

Kleinhans¹,

Salmén²

2016

J of Applied Polymer Sci

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The use of lignin as a renewable resource for the production of less-expensive carbon fibers has in recent years attracted great interest. In order to develop the strength properties, the stabilization and carbonization processes have to be optimized. For this reason, the process parameters during carbonization have here been studied on stabilized lignin fibers in the temperature interval from 300 to 1300 8C. The effects of temperature, heating rate, and straining of fibers during carbonization on the strength properties of carbon fibers were investigated. The heating rate, in the range from 1 to 40 8C/min, was shown to have no effect on the property development of the fibers. During carbonization with no load applied to the fibers, a shrinkage of 20% was noted. Counteracting the shrinkage by imposing a load on the fibers during the carbonization resulted in fibers with a greater stiffness. The tensile strength was not, however, affected by this loading.

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Section: Resultsmentioning

confidence: 86%

Development of lignin carbon fibers: Evaluation of the carbonization process

Kleinhans¹,

Salmén²

2016

J of Applied Polymer Sci

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“…According to work by the Henning group about the study on the mechanical behavior of an extruded mixture during carbonization, the specimen exhibited viscoelastic behavior at temperatures below the resolidification temperature of binder pitch (∼770 K) and ideal elastic behavior at temperatures above it. It is generally accepted that the porosity that developed below 673 K is mostly due to an important release of volatile matter from the fluid, but highly impervious binder pitch tends to increase the internal pressure inside the green body .…”

Section: Introductionmentioning

confidence: 99%

Theoretical Model of Heating Patterns during Carbonization of Green Carbon Blocks

Zhang

Sun

et al. 2011

Energy Fuels

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The potential to damage synthetic graphite is high during the pyrolysis of pitch/coke composite material in processing of carbon/carbon components. Exact modeling of heating patterns could optimize the preparation conditions in order to obtain high quality products. A capillary–cell model was built to evaluate the internal pressure resulting from volatile matter in green carbon blocks during carbonization. The theoretical model for heating patterns was proposed by considering the influence of heating rates on the internal pressure and the thermal stress during the heat-treatment procedure. The results showed that the theoretical heating rates were mainly controlled by mass transfer in the range 467–850 K and by heat transfer in other temperature ranges. The values calculated by the developed model were compared with the industrial results, and the validity of the proposed method for the prediction of heating patterns is evaluated.

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“…A number of studies have been reported in literature on pitch pyrolysis and carbonization (Buttler, 1975;Collett and Rand, 1980;Politis and Chang, 1985;Wallouch et al, 1972). Gonzales et al (1987) and Henning et al (1987) used crushed and mixed samples of coal and pitch. Markovic (1987) investigated pitch impregnated carbon-carbon composites.…”

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confidence: 99%

A kinetic study of pyrolysis in pitch impregnated electrodes

et al. 1990

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Carbon electrodes impregnated with three different pitches have been studied and compared. The electrode samples were heated up to 893 K in a thermogravimetric analyser at different heating rates. The weight loss was recorded with respect to time and temperature. A special technique and a calculation procedure have been developed to handle the pitch dripping from the electrode at low temperatures. A kinetic model assuming a first order reaction rate was used to interpret the data. This paper presents the experimental technique and the results of the study. The model predictions are compared with the data which shows a good agreement.Nous avons analyst5 et compark le comportement d'klectrodes de carbone imprCgnCes avec trois brais diffkrents. Les Cchantillons ont Ctk chauffks jusqu'h 893 K dans un analyseur thermogravimktrique h diffkrentes vitesses de chauffe. Les pertes de poids ont ktk enregistrkes en fonction du temps et de la tempkrature. Une technique expkrimentale particulikre et une mkthode de calcul ont ktk dkvelopkes pour permettre de tenir compte du brai de ressuage qui coule le long de I'klectrode h basse tempkrature. L'analyse des rksultats nous a conduit h I'klaboration d'un modkle cinktique bas6 sur une rkaction du premier ordre. Nous prtsentons ici la technique expkrimentale utiliske et les rksultats de I'etude. Les prkdictions du modtle s'avtrent conformes aux rksultats exp6rimentaux.

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Mechanical properties of pitch-coal extrudates during the carbonization process☆

Cited by 6 publications

References 4 publications

Development of lignin carbon fibers: Evaluation of the carbonization process

Development of lignin carbon fibers: Evaluation of the carbonization process

Theoretical Model of Heating Patterns during Carbonization of Green Carbon Blocks

A kinetic study of pyrolysis in pitch impregnated electrodes

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