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- Title
Synthesis of nanostructured lanthanum fluoborate modified by oleylamine and evaluation of its tribological properties as a lubricating additive in synthetic ester.
- Authors
Jin, Fengjie; Yang, Guangbin; Song, Shiyong; Zhang, Shengmao; Yu, Laigui; Zhang, Pingyu
- Abstract
Lanthanum fluoborate modified by oleylamine [denoted as La(BF4)3-OA] was synthesized as a potential lubricant additive by direct precipitation method with sodium tetrafluoroborate and lanthanum nitrate [La(NO3)3] as the staring materials and oleylamine (OA) as the surface-modifying agent in distilled water-ethanol mixed solvent. The effects of reaction temperature, OA to La(NO3)3 ratio, and surfactant cetyltrimethyl ammonium bromide on the size and shape of as-synthesized La(BF4)3-OA were investigated. The crystalline structure and morphology of as-obtained La(BF4)3-OA were characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectrometry, and X-ray photoelectron spectroscopy. Moreover, the tribological properties of La(BF4)3-OA as an additive in dioctyl sebacate, a synthetic ester, were evaluated with a four-ball machine, and the worn surfaces of the steel balls were analyzed with a field emission scanning electron microscope equipped with an energy dispersive spectrometer accessory. It was found that the as-synthesized La(BF4)3-OA exhibits disk-like nanoflake shape and have a diameter of 10-45 nm, depending on varying synthetic conditions. As-synthesized La(BF4)3-OA as an additive in DIOS possesses excellent antiwear and friction-reduction performance for the steel-steel pair, which is because the as-synthesized additive simultaneously contain tribologically active elements La, B, and F that facilitate the formation of a boundary lubricating and protecting film on sliding steel surfaces thereby avoiding direct contact of the steel-steel pair and significantly reducing the friction and wear. Copyright © 2016 John Wiley & Sons, Ltd.
- Subjects
LANTHANUM; CHEMICAL synthesis; NANOSTRUCTURED materials; SODIUM compounds; AMMONIUM bromide
- Publication
Surface & Interface Analysis: SIA, 2016, Vol 48, Issue 10, p1033
- ISSN
0142-2421
- Publication type
Article
- DOI
10.1002/sia.6019