- Changes in Mechanical and Electrical Properties as a Function of Unidirectional Pressure Changes in Preforming While Isostatic Pressing
for Graphite Block Fabrication
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Tae-Sub Byun, Dong-Pyo Jeon, Sang-Hye Lee, Sang-Woo Lee, Jae-Seung Roh
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J Powder Mater. 2023;30(1):35-40. Published online February 1, 2023
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DOI: https://doi.org/10.4150/KPMI.2023.30.1.35
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 Abstract
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In this study, a graphite block is fabricated using artificial graphite processing byproduct and phenolic resin as raw materials. Mechanical and electrical property changes are confirmed due to the preforming method. After fabricating preforms at 50, 100, and 150 MPa, CIP molding at 150 MPa is followed by heat treatment to prepare a graphite block. 150UP-CIP shows a 12.9% reduction in porosity compared with the 150 MPa preform. As the porosity is decreased, the bulk density, flexural strength, and shore hardness are increased by 14.9%, 102.4%, and 13.7%, respectively; and the deviation of density and electrical resistivity are decreased by 51.9% and 34.1%, respectively. Therefore, as the preforming pressure increases, the porosity decreases, and the electrical and mechanical properties improve. -
Citations
Citations to this article as recorded by  - Effect of Microstructural Change under Pressure during Isostatic Pressing on Mechanical and Electrical Properties of Isotropic Carbon Blocks
Tae-Sub Byun, Sang-Hye Lee, Suk-Hwan Kim, Jae-Seung Roh
Materials.2024; 17(2): 387. CrossRef - Effect of Pressure and Holding Time during Compression Molding on Mechanical Properties and Microstructure of Coke-Pitch Carbon Blocks
Sun-Ung Gwon, Sang-Hye Lee, U-Sang Youn, Jae-Seung Roh
Applied Sciences.2024; 14(2): 772. CrossRef
- Effect of Change in Open Porosity as a Function of Uniaxial Molding Pressure on Density Improvement After Impregnation
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Sang-Min Lee, Sang-Hye Lee, Jae-Seung Roh
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J Korean Powder Metall Inst. 2021;28(1):7-12. Published online February 1, 2021
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DOI: https://doi.org/10.4150/KPMI.2021.28.1.7
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329
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The change in the open porosity of bulk graphite as a function of the uniaxial molding pressure during manufacturing is studied using artificial graphite powder. Subsequently, the graphite is impregnated to determine the effect of the open porosity on the impregnation efficiency and to improve the density of the final bulk graphite. Bulk graphite is manufactured with different uniaxial molding pressures after mixing graphite powder, which is the by-product of processing the final graphite products and phenolic resin. The bulk density and open porosity are measured using the Archimedes method. The bulk density and open porosity of bulk graphite increase as the molding pressure increases. The open porosity of molded bulk graphite is 25.35% at 30 MPa and 29.84% at 300 MPa. It is confirmed that the impregnation efficiency increases when the impregnation process is performed on a specimen with large open porosity. In this study, the bulk density of bulk graphite molded at 300 MPa is 11.06% higher than that before impregnation, which is the highest reported increase. Therefore, it is expected that the higher the uniaxial pressure, the higher the density of bulk graphite. -
Citations
Citations to this article as recorded by - Improving the packing and mechanical properties of graphite blocks by controlling filler particle-size distribution
Hye in Hwang, Ji Hong Kim, Ji Sun Im
Advanced Composite Materials.2024; 33(5): 762. CrossRef - Effect of Pressure and Holding Time during Compression Molding on Mechanical Properties and Microstructure of Coke-Pitch Carbon Blocks
Sun-Ung Gwon, Sang-Hye Lee, U-Sang Youn, Jae-Seung Roh
Applied Sciences.2024; 14(2): 772. CrossRef - Correlation between Pitch Impregnation Pressure and Pore Sizes of Graphite Block
Changkyu Kim, Woong Kwon, Moon Hee Lee, Jong Seok Woo, Euigyung Jeong
Materials.2022; 15(2): 561. CrossRef
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