title: Hydrothermal synthesis of copper zirconium phosphate hydrate [Cu(OH)2Zr(HPO4)2·2H2O] and an investigation of its lubrication properties in grease.
abstract: Copper zirconium phosphate hydrate (Cu(OH)2Zr(HPO4)2·2H2O, hereafter referred to as Cu-α-ZrP) with high crystallinity was directly synthesized in a NaF-CuO-ZrO-P2O5-H2O system under hydrothermal conditions. The copper ion was confirmed to be an exchangeable cation in the Cu-α-ZrP through elemental analysis and a proton ion exchange process. The crystal structure of the Cu-α-ZrP was determined ab initio by using X-ray powder diffraction data. In the structure, the CuO6 octahedron would be located in an exchangeable atom position. Moreover, Cu-α-ZrP was evaluated as an additive in grease in a four ball test. The maximum nonseizure load (PB, representing the load-carrying capacity) of the base grease containing Cu-α-ZrP was increased from 353 to 1235 N. The excellent load-carrying capacity may be explained by the easier adherence of the material to the worn surface forming a tight protective film.
authors.affiliation: Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China.
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Zhang
authors.forename: Hong
authors.initials: H
authors.lastname: Xu
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Zuo
authors.forename: Zhi
authors.initials: Z
authors.lastname: Lin
authors.forename: Stanislav
authors.initials: S
authors.lastname: Ferdov
authors.forename: Jinxiang
authors.initials: J
authors.lastname: Dong
mesh_terms: D003300:Copper / Q000737:chemistry*; D008153:Lubrication; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; C027006:zirconium phosphate; D003300:Copper; D015040:Zirconium