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Liu Z.G.,Qinhuangdao Vocational and Technical College
Applied Mechanics and Materials | Year: 2014

In order to investigate the structural evolution of natural flake graphite during intercalation and exfoliation, natural graphite flakes were treated by intercalating, water-washing, drying and expanding. The corresponding products, graphite intercalation compound (GIC), residue GIC (expandable graphite) and expanded graphite were characterized by X-ray diffraction (XRD). The results can provide reference for the research in this field. © (2014) Trans Tech Publications, Switzerland. Source


Zhang H.,Qinhuangdao Vocational and Technical College
Advanced Materials Research | Year: 2013

Expanded graphite (EG) was ball-milled in a high-energy mill (planetary-type) under an air atmosphere. The products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The anti-friction effect of milled EG used as lubricating additive was investigated. After ball-milling, the relatively ordered graphene planes of original EG become deformed, and the d002 spacing becomes broadened. The milled EG used as lubricating additive have an anti-friction effect, and the effect is more marked than that of original EG. © (2013) Trans Tech Publications, Switzerland. Source


Lu Y.,Qinhuangdao Vocational and Technical College
Advanced Materials Research | Year: 2012

Using three natural graphites with different particle size, 35, 50 and 80 mesh, as raw materials, expandable graphites were prepared by intercalating, water-washing and drying the natural graphites. The products were characterized by X-ray diffraction, Infrared spectroscopy, scanning electron microscope and Raman spectroscopy. Results show that the structure of expandable graphite is affected strongly by the particle size of natural graphite. With increasing the particle size of natural graphite, for expandable graphite, the expansion degree of graphite flakes along the c-axis and the relative ratio of intercalating agents increase, while the structural disorder increases. © (2012) Trans Tech Publications. Source


Li H.,Qinhuangdao Vocational and Technical College
Advanced Materials Research | Year: 2012

A mixture of expanded graphite and iron powders was ball-milled in a high-energy mill under an air atmosphere. The milled powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The anti-friction effect of the powders used as lubricating additive was investigated by a tribo-tester. Results show that the powders have an obvious anti-friction effect, and the effect is associated with the crystallization degree of the milled expanded graphite depending on the milling time, the higher the crystallization degree, the higher the anti-friction effect. © (2012) Trans Tech Publications, Switzerland. Source


Li Y.,Qinhuangdao Vocational and Technical College
Advanced Materials Research | Year: 2012

A mixture of expanded graphite (EG) and boron was ball-milled in a high-energy mill. The microstructure of the milled EG/B powders was characterized by transmission electron microscopy (TEM). The tribological behavior of the milled powders used as lubricating additive was investigated by using a tribo-tester, and the morphology of the worn tribo-surfaces were observed by scanning electron microscope (SEM). The results show that the powders used as lubricating additive have an obvious anti-friction and wear resistance effect, and the lager the applied load, the lower the friction coefficient and the wear severity. © (2012) Trans Tech Publications, Switzerland. Source

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