期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 36, 页码 30891-30899出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b10515
关键词
nanoadditive; LDHs; tribological properties; oil-based
资金
- National Science Fund for Excellent Young Scholars [51522504]
- National Natural Science Foundation of China [51335005, 51321092]
- Shell Global Solutions (U.S.) Inc.
- Chinese Scholarship Council (CSC)
Layered double hydroxides (LDHs) are a class of naturally occurring inorganic minerals that are composed of divalent and trivalent metal cations. In this study, three different sized NiAI-LDH nanoplatelets were synthesized by varying crystallization time during the microemulsification process. The layered structure and three-dimensional size of nanoplatelets were confirmed by transmission electron microscopy (TEM) and atomic force microscopy (AFM). As lubricant additives, their tribological properties in base oil were evaluated by use of a ball-on-disk reciprocating tribometer under three different loads: SO, 100, and 150 N (which created peak Hertz pressures of 1.74, 2.16, and 2.47 GPa). Under contact pressures of up 2.16 GPa, not only did the coefficient of friction (COF) decrease by about 10% after nano-LDHs were added but also the wear performance improved substantially. These improvements resulted from a protective tribolayer formation on the contact interface, as revealed by detailed surface and structure analytical studies. In particular, cross-sectional TEM images revealed that the larger size nanoplatelets (NiA1-24h), rather than the smaller ones (NiA1-6h) showed the best and most stable tribological performance. This was mainly because of their higher degree of crystallinity, which in turn resulted in the formation of a tribofilm with far superior mechanical properties during sliding. Owing to the simple synthetic method and superior tribological properties as oil-based additives, nano-LDHs hold great potential for use in demanding industrial applications in the future.
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