| abstract |
Provided are a composite lubricating material having superior lubricity, an engine oil, a grease, and a lubricating oil. The composite lubricating material results from graphene delaminated from at least a graphitic carbon material and/or a graphitic carbon member being dispersed in a matrix, and is characterized in that the graphitic carbon material has rhombohedral graphite layers (3R) and hexagonal graphite layers (2H), and the fraction Rate (3R) defined by the following formula 1 resulting from an X-ray diffraction method of the rhombohedral graphite layers (3R) and the hexagonal graphite layers (2H) is at least 31%: Rate (3R) = P3/(P3+P4)×100 …(formula 1). Here, P3 is the peak strength in the (101) plane resulting from the X-ray diffraction method of the rhombohedral graphite layers (3R), and P4 is the peak strength in the (101) plane resulting from the X-ray diffraction method of the hexagonal graphite layers (2H). |