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Preparation, characterisation and lubrication performances of Eu doped WO 3 nanoparticle reinforce Mn 3 B 7 O 13 Cl as water‐based lubricant additive for laminated Cu‐Fe composite sheet during hot rolling
Author(s) -
Liang Dong,
Ling Xinnan,
Xiong Sang
Publication year - 2021
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1534
Subject(s) - lubricant , materials science , lubrication , nanoparticle , transmission electron microscopy , doping , tribology , analytical chemistry (journal) , composite material , chemical engineering , nanotechnology , chemistry , organic chemistry , optoelectronics , engineering
Citric acid‐synthesised Eu‐doped WO 3 (WO 3: Eu 3+ ) and Mn 3 B 7 O 13 Cl nanoparticles were characterised by X‐ray diffraction and transmission electron microscopy. The tribological properties of the Eu doped WO 3 and Mn 3 B 7 O 13 Cl prepared as anti‐wear additives for enhanced lubrication were studied using a four‐ball tester. The experiment results indicated that Eu doped WO 3 nanoparticle reinforce Mn 3 B 7 O 13 Cl has excellent load‐carrying capacity, wear‐resistance and friction‐reducing properties in water‐based lubricant, optimum concentration of WO 3 :Eu 3+ ‐Mn 3 B 7 O 13 Cl was 0.5 wt%. The wear scar diameter decreased from 0.62 to 0.37 mm and the coefficient of friction was reduced from 0.083 to 0.065, which reductions are attributed to the nanotribofilms composed of B 2 O 3 , WO 3 , Fe 2 O 3 and Eu 2 O, which prevented direct contact between metals. Hot rolling experiments of laminated Cu‐Fe composite sheet were carried out to study the effect of nano‐WO 3: Eu 3+ ‐Mn 3 B 7 O 13 Cl on surface qualities including topography of rolled strips. Results show that the surface topography becomes smooth with the addition of nanoparticles into water‐based lubricant, which is mainly attributed to the nanoparticles increase the viscosity of water‐based lubricant and the oil film to avoid the direct contact tribopair during hot rolling, thus reducing the friction coefficient and roll wear.