Improved Oxidation Resistance of Graphite Block by Introducing Curing Process of Phenolic Resin

Ko, Jong-Hwan; Lee, Sang-Hye; Roh, Jae-Seung

doi:10.3390/ma16093543

Cited by 3 publications

(1 citation statement)

References 35 publications

(45 reference statements)

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“…However, to avoid any instability during the forming process, the maximum pressure was set to 130 MPa. A previous study by our research team reported the fabrication of carbon blocks under a pressure of 100 MPa [17]. In general, during low-pressure forming, it is challenging to achieve sufficient pressure-induced binding between coke and pitch.…”

Section: Raw Materials and Preparationmentioning

confidence: 99%

Effect of Pressure and Holding Time during Compression Molding on Mechanical Properties and Microstructure of Coke-Pitch Carbon Blocks

Gwon,

Lee,

Youn

et al. 2024

Applied Sciences

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In this study, isotropic coke and coal tar pitch were subjected to compression molding while varying the compression pressure and holding time. As a result, carbon blocks were fabricated, and their mechanical properties and microstructure were analyzed, with respect to applied pressure and holding time. The compression pressure was set to 70, 100 and 130 MPa, while the holding time was set to 1, 2 and 3 min. Overall, with an increase in compression pressure, bulk density increased while porosity decreased. Increased compression pressure also led to enhanced mechanical and electrical properties. Microstructural analysis confirmed that, after compression molding granules that were larger than existing kneaded particles appeared. The formation of granules is attributed to the tendency of kneaded particles to connect and coalesce with each other under applied pressure during the compression molding process. As the compression pressure increased, the proportion of granules in the microstructure increased while the size of pores decreased. This phenomenon can be attributed to kneaded particles coming closer to each other under applied pressure. At a compression pressure of 130 MPa, both bulk density and porosity increased with a longer holding time. Some pores existed within granules, while others protruded out of granules, thereby forming long channels of connected pores around them. This microstructural change was considered to result in degraded mechanical and electrical properties.

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Section: Raw Materials and Preparationmentioning

confidence: 99%

Effect of Pressure and Holding Time during Compression Molding on Mechanical Properties and Microstructure of Coke-Pitch Carbon Blocks

Gwon,

Lee,

Youn

et al. 2024

Applied Sciences

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Feasibility assessment of manufacturing carbonized blocks from rice husk charcoal

Hwang,

Roh,

Nam

2023

Biomass Conv. Bioref.

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Artificial graphite has recently attracted significant interest as a promising carbon material for industrial applications because of its high heat and chemical resistance, excellent electrical conductivity, and low thermal expansion. However, its practical use is severely limited by its high preparation costs and poor cycling stability. In this study, rice husk charcoal (RHC) was prepared from agricultural biowaste using a pyrolysis (heat treatments) method in this study. We investigated the effect of the heat-treatment temperature on rice husk via elemental and thermogravimetric analyses. The results indicated that the rice husk heat treated at 400 °C (RHC 400) was thermally stable with a high carbon content. Its preparation process was also relatively inexpensive. Further, carbonized blocks were prepared using the fabricated RHC and compared their properties with those of artificial graphite scrap (AGS) carbonized blocks. The bulk density, porosity, flexural strength, and electrical resistivity of the RHC carbonized block were 1.14 g/cm3, 24.65%, 52.55 MPa, and 142.93 μΩm, respectively. These results demonstrate that the flexural strength and electrical resistivity of the RHC-prepared block were higher than those of the AGS carbonized block. In contrast, its density was lower than that of the AGS carbonized block.

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Effect of mesophase formation from quinoline insoluble-containing coal tar pitch on physical properties of carbon blocks

Kim,

Lee,

Youn

et al. 2024

Carbon Lett.

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Improved Oxidation Resistance of Graphite Block by Introducing Curing Process of Phenolic Resin

Cited by 3 publications

References 35 publications

Effect of Pressure and Holding Time during Compression Molding on Mechanical Properties and Microstructure of Coke-Pitch Carbon Blocks

Effect of Pressure and Holding Time during Compression Molding on Mechanical Properties and Microstructure of Coke-Pitch Carbon Blocks

Feasibility assessment of manufacturing carbonized blocks from rice husk charcoal

Effect of mesophase formation from quinoline insoluble-containing coal tar pitch on physical properties of carbon blocks

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