Fabrication of isotropic bulk graphite using artificial graphite scrap

Lee, Sang‐Min; Kang, Dong-Su; Kim, Woo-Seok; Roh, Jae-Seung

doi:10.5714/cl.2014.15.2.142

Cited by 17 publications

(14 citation statements)

References 12 publications

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“…At present, environmental regulations have become stricter in light of environmental pollution, and it has become essential to reduce the weight of transportation vehicles. To this end, carbon blocks are used in automobiles, aircraft, rockets, etc., to improve fuel efficiency and are also used in various heat-dissipating materials, heat insulating materials, etc., based on their excellent thermal properties [ 1 , 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Oxygen Content in Binderless Cokes for High-Density Carbon Blocks from Coal Tar Pitch

Park

Lee

et al. 2021

Materials

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High-density carbon blocks are much lighter than metals and have excellent mechanical properties and are one of the materials garnering attention to replace existing metal parts. In this study, a binderless coke was produced by changing the flow rates of nitrogen and air as a carrier gas during heat treatment of coal tar pitch and using this, a green body was formed at 150 MPa and carbonized to produce a high-density carbon block. We express the binderless coke produced in this way by N10A0, N7A3, N5A5, N3A7, N0A10 according to the ratio of nitrogen and air, and in the case of carbon block, we have added CB in front of it. We then considered the effect of oxygen content in the binderless cokes on the optical, chemical, and mechanical properties. It was observed that the produced binderless cokes develop into a dense mosaic structure with a small particle size as the air flow rate increased. To survey the change in oxygen content of the produced binderless coke, O1s and C1s regions were measured using X-ray photoelectric spectroscopy (XPS), and O1s/C1s was calculated. The O1s/C1s ratio steadily increased as the air flow rate increased, and in the case of N0A10, it increased about twice as much as that of N10A0 to 11.20%. β-resin has a very large effect on the mechanical strength of the carbon block in addition to air in the pitch. And in the case of CB-N0A10, it shows the best mechanical strength with a density of 1.72 g/cm3, bending strength of 87 MPa, and shore hardness of 93 HSD.

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Section: Introductionmentioning

confidence: 99%

The Effect of Oxygen Content in Binderless Cokes for High-Density Carbon Blocks from Coal Tar Pitch

Park

Lee

et al. 2021

Materials

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“…8 shows the X-ray diffraction data of the face perpendicular to the compression direction (top face) and the face parallel to the compression direction (side face). The degree of alignment was derived, and the calculated anisotropy ratio of 1.13, as shown in Table 6, demonstrates the outstanding isotropic properties of bulk graphite [30].…”

Section: Impregnationmentioning

confidence: 98%

“…ratio is about 0.98 to 1.10 [30][31][32][33]. They are widely used in electrodes for electric discharging, jigs, crucibles, heating elements, continuous casting dice, and materials for nuclear reactors due to their high strength, air-tightness, chemical resistance, and machinability [20,21,27,28].…”

Section: Artificial Graphitementioning

confidence: 99%

Bulk graphite: materials and manufacturing process

Lee¹,

Kang²,

Roh³

2015

Carbon letters

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Graphite can be classified into natural graphite from mines and artificial graphite. Due to its outstanding properties such as light weight, thermal resistance, electrical conductivity, thermal conductivity, chemical stability, and high-temperature strength, artificial graphite is used across various industries in powder form and bulk form. Artificial graphite of powder form is usually used as anode materials for secondary cells, while artificial graphite of bulk form is used in steelmaking electrode bars, nuclear reactor moderators, silicon ingots for semiconductors, and manufacturing equipment. This study defines artificial graphite as bulk graphite, and provides an overview of bulk graphite manufacturing, including isotropic and anisotropic materials, molding methods, and heat treatment.

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“…based on their excellent electrical and thermal characteristics. [1][2][3][4][5][6] Raw materials for producing high-density carbon blocks can be divided into primary and binary materials according to the number. First, mesocarbon microbeads (MCMBs) are a typical example of primary materials, which are substances that have self-sinterability and can be molded without the need for additional binder materials.…”

mentioning

confidence: 99%

“…Mochida et al reported that the raw material was oxidatively stabilized before molding, the test piece was not deformed even at high temperatures, volatile matter was removed so that swelling was suppressed, and then molding and heat treatment were performed. [4,[25][26][27] In addition, Ragan et al oxidized needle-coke to give a hydroxyl group, a carbonyl group, a carboxyl group, etc. that can contribute to the bonding strength, mixed with a coal tar binder pitch and subjected to molding and heat treatment.…”

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confidence: 99%

Effect of β-Resin and Oxygen Functional Group of Binderless Coke on Mechanical Properties of High-Density Carbon Blocks According to Molding Pressure

Park

Lee

et al. 2021

Preprint

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High-density carbon blocks have excellent mechanical, thermal, and electrical properties. In particular, these blocks are applied in various fields while maintaining excellent physical properties even in harsh environments. In this study, binderless coke manufactured under certain conditions was used to form green bodies (GBs) under various pressure conditions of 50 to 250 MPa, and the bodies were carbonized to form a high-density carbon block (CB). Then, the effect of the β-resin and oxygen functional groups of binderless coke on the mechanical properties of the high-density carbon block according to molding pressure was considered. When molding at a pressure of under 200 MPa, the ratio of O and C (O/C) has a greater effect, and the larger the O/C, the higher the mechanical properties. On the other hand, when molding at a high pressure of 250 MPa, the β-resin content has a greater effect and steadily increases when the β-resin content is low and when the mechanical properties are sufficiently reduced. In particular, in the case of CB-N7A3–250, which has the highest β-resin content of 3.7 wt%, the density was 1.79 g/cm3, the flexural strength was 106 MPa, and the shore hardness was 99 HSD.

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Fabrication of isotropic bulk graphite using artificial graphite scrap

Cited by 17 publications

References 12 publications

The Effect of Oxygen Content in Binderless Cokes for High-Density Carbon Blocks from Coal Tar Pitch

The Effect of Oxygen Content in Binderless Cokes for High-Density Carbon Blocks from Coal Tar Pitch

Bulk graphite: materials and manufacturing process

Effect of β-Resin and Oxygen Functional Group of Binderless Coke on Mechanical Properties of High-Density Carbon Blocks According to Molding Pressure

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