以在不同氧化温度下制备的氧化中间相沥青为原料制备了具有不同密度的炭/石墨材料, 根据对样品物理性能和微观结构的研究得出最佳的工艺条件. 以150MPa压制的坯体经过2200℃石墨化后得到具有高密度(2.02g/cm3)、低孔率(2.03%)、大体积收缩(44.86%)、高的弯曲强度和压缩强度(70.3和123.3MPa)的样品. 该样品具有均匀致密的结构. 实验证明, 氧化中间相沥青是制备高性能炭石墨材料良好的前驱体.
Carbon grains for binderless molding were prepared by oxidization treatment of mesophase pitch at different temperatures, and carbon materials were prepared. The effects of oxidation temperature, molding pressure, and heat-treatment temperature on the physical properties of the carbon materials were investigated. Results indicate that increase in molding pressure significantly increases mechanical strength of the resulting carbon materials. The resultant carbon materials with homogeneous fine-mosaic texture, high density and strength are obtained when the grains are oxidized at 200℃. The high-performance carbon materials are obtained when the grains oxidized at 200℃, molded at 150MPa and then graphitized at 2200℃, whose density, porosity, bending strength, and compressive strength are 2.02g/cm3, 2.03%, 70.3MPa, 123.3MPa, respectively. Results show that oxidized mesophase pitch is a good precursor for preparing high-performance carbon materials.
[1] Fitzer E. Carbon, 1987, 25 (2): 163-190.
[2] Blazewicz S, Blocki J, Chlopek J, et al. Carbon, 1996, 34 (11): 1393-1399.
[3] Miyazaki K, Hagio T, Kobayashi K. J. Mater. Sci., 1981, 16: 752-762.
[4] Gao X, Liu L, Guo Q, et al. Comp. Sci. Technol., 2007, 67: 525-529.
[5] Tong Q, Shi J, Song Y, et al. Carbon, 2004, 42: 2495-2500.
[6] Qiu H, Song Y, Liu L, et al. Carbon, 2003, 41: 973-978.
[7] Ogawa I, Kobaysshi K, Honda H. Tanso, 1978, 93: 57-62.
[8] Mochida I, Korai Y, Fujitsu H, et al. J. Mater. Sci., 1982, 17: 525-532.
[9] Ogawa I, Hagio T, Yoshida H, et al. Tanso, 1982, 109: 41-45.
[10] Wang Y G, Korai Y, Mochida I. Carbon, 1999, 37: 1049-1057.
[11] Song Y, Zhai G, Li G, et al. Carbon, 2004, 42: 1427-1433.
[12] Mochida I, Fujiura R, Kojima T, et al. Carbon, 1994, 32 (5): 961-969.
[13] Asano K, Tamura H, Nezu Y, et al. US Patent 4293533, 1997.
[14] 马兆昆, 史景利, 刘 朗, 等(MA Zhao-Kun, et al). 无机材料学报(Journal of Inorganic Materials), 2006, 21 (5): 1167-1172.
[15] Iwashita N, Park C R, Fujimoto H, et al. Carbon, 2004, 42: 705-714.
[16] Hoffmann W R, Huttinger K J. Carbon, 1993, 31: 263-268.
[17] Zhou C, McGinn P J. Carbon, 2006, 44 (9): 1673-1681.
