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Effect of electric current on the microstructural evolution and tribological behavior of highly oriented pyrolytic graphite
Sun, Yang; Li, Jianguo; Yang, Hailin; Kang, Xiao; Zhang, Lei
2020-06-01
Source PublicationJOURNAL OF MATERIALS SCIENCE
Volume55Issue:17Pages:7283-7294
AbstractThe sliding electrical contact behavior on the perpendicular surface of highly oriented pyrolytic graphite has been systematically studied under various electric current densities and environmental atmospheres. The results indicated that the friction coefficient decreased from 0.30 to 0.23 in wet air, and it increased from 0.32 to 0.39 in dry N-2 with increasing electric current density from 0 to 50 A/cm(2). The opposite tribological behavior induced by electric current between wet air and dry N-2 was attributed to the changes in the microstructure and carbon dangling bonds. Electric current caused the nanostructure defects and carbon dangling bonds to increase in both wet air and dry N-2. In wet air, these carbon dangling bonds were passivated by -H and -OH, which reduced the sliding force and caused the debris parallel to the sliding direction, thereby decreasing the friction coefficient. In dry N-2, however, the carbon dangling bonds could not be passivated for the lack of water molecules. As a result, electric current oriented the debris perpendicular to the sliding direction, and the friction coefficient increased. In addition, it provided a novel strategy for tuning the tribological behavior of carbon materials in situ by adjusting the environmental atmospheres and electric current density.
DOI10.1007/s10853-020-04518-5
WOS IDWOS:000520835700009
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82819
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Sun, Yang,Li, Jianguo,Yang, Hailin,et al. Effect of electric current on the microstructural evolution and tribological behavior of highly oriented pyrolytic graphite[J]. JOURNAL OF MATERIALS SCIENCE,2020,55(17):7283-7294.
APA Sun, Yang,Li, Jianguo,Yang, Hailin,Kang, Xiao,&Zhang, Lei.(2020).Effect of electric current on the microstructural evolution and tribological behavior of highly oriented pyrolytic graphite.JOURNAL OF MATERIALS SCIENCE,55(17),7283-7294.
MLA Sun, Yang,et al."Effect of electric current on the microstructural evolution and tribological behavior of highly oriented pyrolytic graphite".JOURNAL OF MATERIALS SCIENCE 55.17(2020):7283-7294.
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