Synthesis and Tribological Properties of Sodium-Ion-Exchanged α-Zirconium Phosphate

Abstract

Abstract: Sodium-ion-exchanged α-zirconium phosphate (Na-α-ZrP) was synthesized by using disodium hydrogen phosphate as sodium source, which was an efficient ion exchange way. The tribological properties of Na-α-ZrP as an additive in lithium grease were investigated by a four-ball tester and a SRV tester, respectively. The synergistic effect of Na-α-ZrP with ZDDP also be studied. Results indicate that Na-α-ZrP can effectively improve the antiwear and friction-reducing properties of lithium grease. Combined with ZDDP, grease demonstrated excellent anti-wear performance, especially under high loads. The possible wear mechanism was discussed by observing the worn surface under 3D optical profiler, scanning electron microscope (SEM), energy-dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS). The simple synthetic method and superior tribological performance make the Na-α-ZrP become a potential choice for lubricant additives.

Key words: sodium-ion-exchanged layered zirconium phosphates, ZDDP, tribological properties

Tian Chengguang Zhang Xiaosheng Xu Hong Dong Jinxiang. Synthesis and Tribological Properties of Sodium-Ion-Exchanged α-Zirconium Phosphate[J]. China Petroleum Processing & Petrochemical Technology, 2021, 23(4): 83-94.

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