Preparation and tribological properties of nanoparticle lanthanum borate

Hu, Zeshan; Dong, Junhang; Chen, G.X; He, Jiaqi

doi:10.1016/s0043-1648(00)00415-4

Cited by 104 publications

(64 citation statements)

References 8 publications

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“…In these published articles, special attention has been paid to the tribological properties of the produced borate species and it was claimed that nano-sized metal borate species had significant role in reducing friction and wear properties when added into base oils. However, the lubricating property of the surfactant was not considered and the characterization of the metal borates was not completed in these studies [12][13][14]. The lubricating ability of sorbitan monolaurate and ethoxylated sorbitan monolaurate in paraffin oil were verified and as compared to paraffin oil, wear scar diameter was reduced four times, while the friction coefficient was reduced six times as reported by Wasilewski and Sulek [15].…”

Section: Introductionmentioning

confidence: 97%

“…With the help of lubricants, the contact zones of moving parts can not come in direct contact with each other and the lubricants prevent the increase in temperature causing adhesion, scuffing, or even welding [11]. In literature many studies were conducted for the preparation of nano-sized metal borates by supercritical fluid drying technique and the dispersion of these species in the base oil by using sorbitan monostearate surfactant [12][13][14]. In these published articles, special attention has been paid to the tribological properties of the produced borate species and it was claimed that nano-sized metal borate species had significant role in reducing friction and wear properties when added into base oils.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of zinc borate by inverse emulsion technique for lubrication

Savrık

Balköse

Ülkü

2010

J Therm Anal Calorim

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Lubricating oil additives based on boron compounds are promising materials for lubrication due to their tribological advantages such as antiwear efficiency, good film strength, and high temperature resistance. This article deals with the preparation of zinc borate particles that are well dispersed and colloidally stabilized in mineral oil. This method starts with preparing two inverse emulsions (water-in-oil) with sorbitan monostearate (Span 60) as a surfactant, light neutral oil as a continuous phase, and the aqueous solutions of borax decahydrate (Na 2 B 4 O 7 Á10H 2 O) and zinc nitrate (Zn(NO 3 ) 2 Á6H 2 O) as the dispersed phases. The produced particles were zinc borate crystals having both rod-like and spherical morphologies, and the diameters of spherical particles were changing between 20 and 30 nm. FTIR spectra of the obtained particles showed the characteristic peaks of trihedral borate (B(3)-O) and tetrahedral borate (B(4)-O) groups as well as the specific peaks of the sorbitan monostearate. TG showed 30.42% and 22.08% mass loss at 600°C for the samples prepared by inverse emulsion and precipitation techniques, respectively. The endothermic peak at 50°C is observed due to the melting of sorbitan monostearate and the heat of melting is evaluated as -3.50 J/g. Tribological studies revealed that sorbitan monostearate not only outperformed as a dispersing agent of inorganic particles, but also it proved to be an anti-wear agent. Zinc borate produced by precipitation decreased the wear scar diameter from 1.402 to 0.639 mm and the friction coefficient from 0.099 to 0.064. The inverse emulsion was effective in decreasing wear scar diameter and the friction coefficient by lowering them to 0.596 and 0.089 mm, respectively.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Synthesis of zinc borate by inverse emulsion technique for lubrication

Savrık

Balköse

Ülkü

2010

J Therm Anal Calorim

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“…The lubricants with properly selected additives are able to create the compact viscous layer between sliding surfaces, which prevents the sliding materials from being in full relative contact. Hu et al [10] targeted the research on the investigation of the minerals oils and of several types of dispersed nano-particles and their effect on the coefficient of friction and on the wear of the sliding parts. They found several types of nano-particles which decrease the coefficient of friction and the wear very significantly.…”

Section: Results Of the Measurementsmentioning

confidence: 99%

Evaluation of material friction properties using the “Block-on-Ring” apparatus

Kašparová¹,

Zahálka²,

Houdková³

2009

WIT Transactions on Engineering Sciences

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One of the tribological tests for the evaluation of friction properties is introduced in this paper. The test, named "Block-on-Ring", is in accordance with the standard ASTM G-77 and in ŠKODA VÝZKUM Ltd. is realized on the VRS-3 renovated apparatus. The measurement is as follows: the flat surface of the sample is pressed against the cylindrical surface of a rotating wheel of the rotor material. Arbitrary oil is fed to the material contact surface and the increasing temperature is detected using a thermocouple. The friction force is recorded using the strain-gauge dynamometer. The test is performed in a number of periods and always after one expiration time the wear track formed in the sample is measured and evaluated. The final results are the summary of the partial results of the long-standing tests and are used for the preliminary detection of the friction behavior of individual material couples.

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“…Oil-soluble boron containing compounds are good friction-reducing additives and possess antirust and anticorrosive properties, but they are liable to hydrolyze. Hu et al have synthesized amorphous lanthanum borate nanoparticles as a wear resistance additive in lubricating oil [107]. The wear resistance and load carrying capacity of base oil was significantly improved.…”

Section: Physicochemistry Process Of Nanoparticular As Lubricant Addimentioning

confidence: 99%

Physicochemistry aspects on frictional interfaces

Zhou

Liu

2017

Friction

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Friction exists wherever relative motion occurs and is the main source of energy consumption. Lubrication plays a significant role in improving fuel efficiency, reducing emissions, and prolonging the service life of machines. Surface interactions between two moving solid surfaces or the flow of a fluid (and/or environment) on a solid surface are the primary causes of friction. Apart from the mechanical design of moving parts, surface physicochemistry is of crucial importance to lubrication. This review deals with the frontier research on controlling friction and lubrication, highlights the importance of physicochemistry aspects, and enumerates the state-of-the-art chemistry solutions to tribological issues. It aims at inspiring talented young scientists from different fields to make significant contributions to the area.

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Preparation and tribological properties of nanoparticle lanthanum borate

Cited by 104 publications

References 8 publications

Synthesis of zinc borate by inverse emulsion technique for lubrication

Synthesis of zinc borate by inverse emulsion technique for lubrication

Evaluation of material friction properties using the “Block-on-Ring” apparatus

Physicochemistry aspects on frictional interfaces

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