A study of P-N compound as multifunctional lubricant additive

Abstract

A novel P-N compound was synthesised, and its tribological and anti-oxidation behaviours used as lubricant additive for polyalphaolefins (PAO4) were evaluated. The results demonstrate that adding only low amount (<2 wt.%) of P-N compound into PAO4 could improve its anti-wear performance by 10 times, enhance its load-carrying capacity and oxidative stability, verifying the P-N compound is a kind of multifunctional and high-performance additive. The morphology and the chemical composition of the worn surfaces were characterised by scanning electron microscopy and X-ray photoelectron spectroscopy, indicating that the excellent anti-wear and load-carrying performance could be attributed to the forming of boundary lubrication film composed of iron oxide, iron phosphate, organic phosphine and organic amine, and so on. The work reported here is helpful to pave the practical applications and to understand the action mechanism of the multifunctional lubricant additives.

A review of recent developments of friction modifiers for liquid lubricants (2007–present)

“…To further avoid the compatibility problem in lubricants, a P-N compound (81) as a multifunctional lubricant additive was synthesized, and exhibited excellent anti-wear and load-carrying capacities due to the formation of boundary lubrication film composed of iron oxide, iron phosphate, organic phosphine and organic amine, and so on [146].…”

Preparation of borate ester and evaluation of its tribological properties as an additive in different base oils

“…The N1s peaks emerge at 397.5 eV and 399.9 eV, the former corresponds to BN, and the latter corresponds to organic nitrogen compound. 3,25,26 Moreover, these compounds were also supported by the binding energies of B1s at around 189.7 eV. This indicates that N in as-synthesised by PAO containing 0.6% MEBE (see in Figure S2) is similar to that by LP-MEBE.…”

“…This indicates that boron takes part in tribochemical reaction during the sliding process. The N1s peaks emerge at 397.5 eV and 399.9 eV, the former corresponds to BN, and the latter corresponds to organic nitrogen compound . Moreover, these compounds were also supported by the binding energies of B1s at around 189.7 eV.…”

Tribological Properties of the Lubricant Containing Titanium Dioxide Nanoparticles as an Additive

“…The first method is the addition of dispersant into base oil. The main drawback of this method is that the sedimentation is unavoidable after a long-time storage and the negative effect of same dispersants on tribological properties [28][29][30][31]. The second method is the usage of surfactant [31][32][33].…”