Researches on Fractal Features of Graphite Porous Materials

Abstract:

The mercury porosimetry experiment has tested three different kinds of porosity graphite and the microscopic structure of impregnation antimony materials, and has calculated the corresponding fractal dimension by using the Menger model. The results show that: the main pore diameter of the graphite materials is in the interval of , most of which can be filled by impregnation antimony, and graphite and impregnation antimony materials both have the fractal characteristics. Graphite materials also have the dual fractal characteristics. Its fractal inflection point aperture is about 1μm, and the fractal dimension (3.05 ~ 3.25) of the small pores (φ≤1μm) is less than the one (3.71 ~ 3.95) of the large pores (φ>1μm). The reason why existing the dual fractal characteristics is that the size of the pore formation mechanism is different. Impregnation occurs mainly in the range of large pores, characteristics of which is an important factor to influence the quality of impregnation materials. The material formula is the main factor to influence the large pores and an important guarantee to improve the quality of impregnation products.

• Periodical: Advanced Materials Research (Volume 507)
• Pages: 25-29
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.507.25
• Online since: April 2012
• Authors: Qi Liu, Ya Fei Hu, Qi Li Wang
• Keywords: Dual Fractal, Graphite Materials, Impregnation, Mercury Porosimetry Experiment

References

[1] LIU Qi , HU Ya-fei, XIONG Jian-jun etal. Study of Fractal Characteristics of Antimony Impregnated Graphite Seal Material Based on Matlab[J] Journal of China University of Mining & Technology, 2009, 6: 862-86.

[2] HU Ya-fei, WANG Lei, HU Jian-wen. Manufacture and characters of antimony-immersed graphite seal ring materials used in medium speed coal mills [J]. Materials for Mechanical Engineering, 2006, 30(6): 56-57.

[3] WANG Hong-mei. Mercury Determination the Error of Structure of Porous Material[J]. Guangzhou Chemical Industry , 2009, Vol37, No1: 109-111.

[4] SONG Jun-wei, FANG Kun-he, LIU Dong-mei, etal. Research on fractal characteristics of phosphate slag-cement paste pore with MIP[J]. Engineering Journal of Wuhan University, 2008, 12: 41-45, 50.

[5] Long-jun, ZHANG Dai-jun, XIAN Xue-fu. Coal Convers (in Chinese), 1995, 18(1): 31–38.

[6] LI Yong-xin, CHEN Yi-min, HE Xing-yang, et al. J Chin Ceram Soc (in Chinese), 2003, 31(8): 774–779.

[7] WANG Xue-long, HU Rui, XUE Xiang-yi, et al. Mater Rev (Res Ed, in Chinese), 2009, 23(3): 66–68.

[8] JI X, CHAN S Y N, FENG N. Fractal model for simulating the space-filling process of cement hydrates and fractal dimensions of pore structure of cement-based materials [J]. Cem Concr Res, 1997, 27(11): 1691–1699.

DOI: 10.1016/s0008-8846(97)00157-9

[9] WEI Jiang-xiong, YU Qi-jun, ZENG Xiao-xing, et al. Journal of South China University of Technology (Natural Science Edition), 2007, 35(2): 121–124.

[10] ZHU Bo-quan, FANG Bin-xiang, LI Xiang-cheng, etal. Fractal characteristics of pore structure of corundum based castables. [J] Journal of the Chinese ceramic society, 2010, 38(4): 730-734.