Effect of expansion temperature of expandable graphite on microstructure evolution of expanded graphite during high-energy ball-milling

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.09.004· OSTI ID:22066159

Xueqing, Yue ^[1]; Liang, Li ^[2]; Fucheng, Zhang ^[1]

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1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004 (China)
2. Internal Combustion Engine Research Institute, Tianjin University, Tianjin 300072 (China)

Two expanded graphites (EG), marked as EG-1 and EG-2, were prepared by rapid heating of expandable graphite to 600 and 1000 deg. C, respectively, and ball milled in a high-energy mill (planetary-type) under air atmosphere. The microstructure evolution of the ball-milled samples was characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). XRD analysis shows that the evolution degree of the average crystallite thickness along the c-axis (L{sub c}) of EG-2 is lower than that of EG-1 during the milling process. From the HRTEM images of the samples after 100 h ball-milling, slightly curved graphene planes can be frequently observed both in the two EGs, however, EG-1 and EG-2 exhibit sharply curved graphene planes and smoothly curved graphene planes with high bending angles, respectively.

• OSTI ID: 22066159
• Journal Information: Materials Characterization, Vol. 60, Issue 12; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
BENDING
GRAPHITE
MICROSTRUCTURE
MILLING
NANOSTRUCTURES
TEMPERATURE DEPENDENCE
THERMAL EXPANSION
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION