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J. Korean Ceram. Soc. > Volume 43(12); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(12): 839.
doi: https://doi.org/10.4191/kcers.2006.43.12.839
석탄계 피치를 이용한 고밀도 흑연 제조
조광연, 김경자, 류도형, 임광현1, 김정일1, 신인철1, 임연수2, 주혁종3
요업기술원 나노소재응용본부
1대양산업
2명지대학교 신소재공학과
3충남대학교 고분자공학과
Manufacture of High Density Graphite Using Coal Tar Pitch
Kwang-Youn Cho, Kyung-Ja Kim, Doh-Hyung Riu, Kwang-Hyun Lim1, Jung-Il Kim1, In-Cheol Shin1, Yun-Soo Lim2, Heyok-Jong Joo3
Division of Nano Materials Application, KICET
1Dai Yang Industrial Co.
2Division of Materials Science and Engineering, Myongji University
3Division of Polymer Science & Engineering, Chungnam University
ABSTRACT
Graphite has hexagonal closed packing structure with two bonding characteristics; (1) van der waals bonding between c axis, and (2) covalent bonding in the a and b axis. The weak van der waals bonds cause self-lubricant property, and the strong covalent bonds cause excellent electric and thermal conductivity. Furthermore, graphite is chemically very inert because of the material composed of only carbon elements. Thus, graphite is very useful for mechanical sealing materials. However, Graphite have porous microstructure because starting materials of graphite produce many volatile during the manufacturing processes. This causes low density of graphite, which is unsuitable for the mechanical sealing materials. Thus, further impregnation process is generally needed to enhance the graphite density. In this work, high density graphite is prepared with the principle of densification when coke and pitch binder, prepared from thermal treatment of coal tar pitch, become dehydrogenation during graphitization or carbonization.
Key words: Graphite, Mechanical seal, Densification, Cokes, Pitch binder
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