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分别利用炭黑、石油焦、针状焦和天然石墨粉为填料,煤沥青为黏结剂,经模压成型(150MPa,10min)、炭化(1300℃,1h)和石墨化(2300℃)制备炭/石墨材料.考察了填料类型对最终炭/石墨材料物理性能和微观结构的影响.研究结果表明:利用炭黑为填料所制材料具有较高的机械强度,但其导热和导电性能相对较差;经石墨化后(2300℃),其抗弯和抗压强度分别达到88.0和173.2MPa.而以天然石墨粉为填料所制材料具有较好的导热和导电性能,在室温下其导热率达到278W/m · K;另外,其抗弯和抗压强度分别达到51.1和90.2MPa.微观结构分析表明,以天然石墨粉为填料所制得的材料具有最大的微晶尺寸和高度的取向性.

Carbon/graphite material was prepared by subjecting a mixture of coal-tar pitch binder and a relevant filler to uniaxial compression at 150MPa for 10min, followed by calcination at 1300℃ for 1 h, and graphitization at 2300℃ in an induction furnace. Four fillers, carbon black(CB), petroleum-coke powder, needle-coke powder, and natural graphite powder(NG), were used. The effect of filler type on the performance and microstructure of the material was investigated. Results reveal that the CB-based material has excellent flexural and compressive strength, with the highest values of 88.0 and 173.2MPa, respectively, but poor thermal and electrical conductivity. The thermal conductivity of the NG-based material has the highest value of 278W/m · K, but the flexural and compressive strength are limited to 51.1 and 90.2MPa, respectively. Microstructural analysis showed that the NG-based material has the largest crystallite size, as well as the most perfect orientation of graphite layers.

参考文献

[1] Kawano Y.;Kawarada T.;Mochida I.;Korai Y.;Fukuda T. .Puffing behavior during the graphitization of coal-tar-based needle coke impregnated with iron(II) sulfate and boric acid[J].Carbon: An International Journal Sponsored by the American Carbon Society,2000(5):759-765.
[2] Endo M.;Takahashi T.;Takeuchi K.;Dresselhaus MS.;Nishimura Y. .LITHIUM STORAGE BEHAVIOR FOR VARIOUS KINDS OF CARBON ANODES IN LI ION SECONDARY BATTERY[J].The journal of physics and chemistry of solids,1996(6/8):725-728.
[3] Fujimoto H;Mabuchi A;Tokumitsu K et al.Irreversible capacity of lithium secondary battery using meso-carbon micro beads as anode material[J].Journal of Power Sources,1995,54(02):440-443.
[4] Zhanjun Liu;Quangui Guo;Lang Liu;Junling Chen;Jiangang Li .Improvements in performance and microstructure of doped graphites as plasma-facing materials by a new process[J].Fusion engineering and design,2007(1):55-59.
[5] 刘占军,郭全贵,曹雅秀,刘长安,宋进仁,刘朗.利用"二次焦"制备高强炭/石墨材料[J].新型炭材料,2006(04):302-306.
[6] Haipeng Qiu;Yongzhong Song;Lang Liu;Gengtai Zhai;Jingli Shi .Thermal conductivity and microstructure of Ti-doped graphite[J].Carbon: An International Journal Sponsored by the American Carbon Society,2003(5):973-978.
[7] Sanchez-Gonzalez J;Macias-Garcia A;Alexandre-Franco MF;Gomez-Serrano V .Electrical conductivity of carbon blacks under compression[J].Carbon: An International Journal Sponsored by the American Carbon Society,2005(4):741-747.
[8] Fan ZJ.;Li L.;Li JG.;Song JR.;Chen JL.;Shi JL.;Zhai GT. .The preparation of fine-grain doped graphite and its properties[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2002(1):77-82.
[9] TOSIYA KINOSHITA;SHIGERY MUNEDAWA .EFFECT OF GRAIN BOUNDARY SEGREGATION ON THERMAL CONDUCTIVITY OF HOT-PRESSED SILICON CARBIDE[J].Acta materialia,1997(5):2001-2012.
[10] Hoffman W R;Hettinger K J .Demonstration of spontaneous liquid-phase sintering of mesophase powders[J].Carbon,1993,31(02):259-262.
[11] Hoffman W R;Huttinger K J .Modeling of the apparent viscosity of pitches and mesophase at linear temperature increase up to 500℃[J].Carbon,1993,31(02):263-268.
[12] Zhan Jun Liu;Quan Gui Guo;Jin Ren Song .Effect of Ti dopant on shrinkage and performance of MCMB-derived carbon laminations[J].Carbon: An International Journal Sponsored by the American Carbon Society,2007(1):146-151.
[13] Jiang W;Tran T;Song X et al.Thermal and electrochemical studies of carbons for Li-ion batteries:1.Thermal analysis of petroleum and pitch cokes[J].Journal of Power Sources,2000,85(02):261-268.
[14] 李圣华.炭石墨材料制品[M].北京:冶金工业出版社,1983:40-42.
[15] Liu, ZJ;Guo, QQ;Shi, JL;Zhai, GT;Liu, L .Graphite blocks with high thermal conductivity derived from natural graphite flake[J].Carbon,2008(3):414-421.
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