함침재의 점도에 따른 벌크흑연의 굽힘강도 및 전기비저항 변화

이상민; 이상혜; 노재승; Sang-Min Lee; Sang-Hye Lee; Jae-Seung Roh

Korean Journal of Materials Research, Vol.31, No.2, 108-114, February, 2021

DOI10.3740/MRSK.2021.31.2.108 Export Citation

함침재의 점도에 따른 벌크흑연의 굽힘강도 및 전기비저항 변화

Changes in Flexural Strength and Electrical Resistivity of Bulk Graphite According to the Viscosity of Impregnant

이상민, 이상혜¹, 노재승^{1, †}

금오공과대학교 신소재연구소
¹금오공과대학교 신소재공학과

Sang-Min Lee, Sang-Hye Lee¹, and Jae-Seung Roh^{1, †}

Advanced Material Research Center, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea
¹School of Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea

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In the manufacturing of bulk graphite, pores produced by vaporization and discharge of volatile materials in binders during carbonization reduce the density of bulk graphite, which adversely affects the electrical conductivity, strength and mechanical properties. Therefore, an impregnation process is introduced to fill the pores and increase the density of bulk graphite. In this study, bulk graphite is prepared by varying the viscosity of the impregnant. The microstructure of bulk graphite is observed. The flexural strength and electrical resistivity are measured. As the viscosity of the impregnants decreases and the number of impregnations increases, it is shown that the number of pores decreases. The density before impregnation is 1.62 g/cm3. The density increases to 1.67 g/cm3 and porosity decreases by 18.6 % after three impregnations using 5.1 cP impregnant, resulting in the best pore-filling effect. After three times of impregnation with a viscosity of 5.1 cP, the flexural strength increases by 55.2 % and the electrical resistivity decreases by 86.76 %. This shows that a slight increase in density due to the pore-filling effect improves the properties of bulk graphite.

Keywords:bulk graphite;impregnant;viscosity;flexural strength;resistivity

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[1] Donnet JB, Park SJ, Brendle M, Carbon, 30, 263 (1992)

[2] Brooks JD, Taylor GH, Chemistry and Physics of Carbon, 1st ed., p.243, New York (1968).

[3] March H, Heintz EA, Rodriguez-Reinoso F, Introduction to Carbon Technologies, p.669, University of Alicante, Spain (1997).

[4] Mattson JS, Mark HB, Activated Carbon: Surface Chemistry and Adsorption from Solution, p.227, New York (1971).

[5] Ohkita K, Tubokawa N, Carbon, 10, 631 (1972)

[6] Kim JY, Lee SY, Choi JH, Park YD, J. Korean Ceram. Soc., 29, 396 (1992)

[7] Chung HJ, Lim YS, J. Korean Ceram. Soc., 33, 1387 (1996)

[8] Bhatia G, Aggarwal RK, J. Mater. Sci., 16, 1757 (1981)

[9] Shin YW, The J. of thr Korean Soc. for Power Syst. Eng., 9, 143 (2005).

[10] Matzinos PD, Patrick JW, Walker A, Carbon, 34, 639 (1996)

[11] Youm HN, Kim KJ, Lee JM, Chung YJ, J. Korean Ceram. Soc., 30, 852 (1993)

[12] Wang J, Microelectron. Reliab., 42, 293 (2002)

[13] Sung JY, et al., The Korean Society of Manufacturing Technology Engineers, Seoul (2008).

[14] Han YS, Kim HJ, Shim YS, Park JK, Ko JC, J. Korean Ceram. Soc., 46, 16 (2009)

[15] Oguchi Y, Mori J, Taikabutsu Overseas, 13, 43 (1993)

[16] Park SJ, Carbon Material, p.68, Daeyoungsa, Seoul (2006).

[17] Lee SM, Kang DS, Kim HS, Roh JS, Carbon Lett., 16, 132 (2015)

[18] Lee SM, Kang DS, Kim WS, Roh JS, Carbon Lett., 15, 142 (2014)

[19] Lausevic Z, Marinkovic S, Carbon, 24, 575 (1986)

[20] Yamashita Y, Ouchi K, Carbon, 19, 89 (1981)

[21] Lum R, Wilkins CW, Robbins M, Lyons AM, Jones RP, Carbon, 21, 111 (1983)

[22] Mathur RB, Dhakate SR, Gupta DK, Dhami TL, Aggarwal RK, J. Mater. Process. Technol., 203, 184 (2008)