Future directions of fundamental research in additive tribochemistry

Wei, Dongbin

doi:10.1002/ls.3010070303

Cited by 12 publications

(2 citation statements)

References 59 publications

(6 reference statements)

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“…(Monaghan, 1988). Commonly used anti-wear additives are Tricresyl phosphate, dibutyl phosphite, Zinc dialkyl dithiophosphate (ZDDP), molybdenum dithio phosphate, molybdenum dithio carbamate (MoDTC) and organic borate compounds (Xue and Liu, 1994; Wei, 1995). Among these additives, the most commonly used additive is ZDDP.…”

Section: Introductionmentioning

confidence: 99%

Influence of surface roughness and ZDDP additive on the friction and wear of reciprocating sliding surfaces at high contact pressures

Anil

Rajamohan

2017

ILT

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Purpose Surface roughness has been proved to be influencing the running-in wear of machined components under dry and lubricated sliding conditions. Zinc dialkyl dithiophosphate (ZDDP) is widely used as an anti-wear additive, which reduces the wear by the formation of a tribofilm on the surface (Spikes, 2004). Factors such as temperature, sliding distance, etc. influence the formation of the film. A significant reduction in the power loss due to friction and wear is possible if a synergy is attained between surface roughness effects and the effectiveness of the tribofilm. The present work aims to study the influence of surface roughness and ZDDP addition on the formation and removal of the tribofilm under high contact pressures. Design/methodology/approach Samples were prepared by machining. Surface roughness was varied by varying the milling parameters. A reciprocating friction and wear test machine with a ball-on-flat geometry was used for the study. Tests were performed with mineral base oil and base oil added with 1 per cent by weight ZDDP under different operating parameters. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) with energy dispersive X-Ray spectroscopy (EDS) analysis were conducted to study the surface morphology of the tribofilm. Findings A quasi-steady-state analysis conducted showed that the wear rate was much lower when tested with base oil containing ZDDP after about 65 min. AFM analysis confirmed the presence of chemically reacted films on the surface. SEM analysis revealed agglomeration of crystal like glassy phosphates. However, high contact pressures at the interface caused the removal of the films resulting in variations in the coefficient of friction. A comparison of the wear rates among the samples of different roughness values tested at 100°C showed that the anti-wear performance of ZDDP was not effective due to high contact pressures. Originality/value The findings in this study regarding the tribofilm formation with ZDDP additive and its failure due to high contact pressures will be beneficial for further investigation on wear resistant boundary films developed under such extreme conditions.

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Section: Introductionmentioning

confidence: 99%

Influence of surface roughness and ZDDP additive on the friction and wear of reciprocating sliding surfaces at high contact pressures

Anil

Rajamohan

2017

ILT

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“…Expectedly, phosphorus and nitrogen are combined together, which should be a kind of promising additive. Moreover, heterocyclic phosphate ester provides low environment pollution, high thermal stability and excellent anti‐wear properties …”

Section: Introductionmentioning

confidence: 99%

Benzimidazolyl phosphates as anti‐wear additives in poly(ethylene glycol) for steel/steel contacts

Qiao

Wang

Duan

2013

Lubrication Science

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Four novel benzimidazolyl phosphates (BPs) were synthesized and evaluated as anti-wear additives in poly(ethylene glycol) for steel/steel contacts. The friction experiments were carried out on an Optimol SRV-I oscillating reciprocating friction and wear tester (SRV) both at room temperature and high temperature. The worn surfaces of the steel discs were analysed by JSM-5600LV scanning electron microscope and PHI-5702 multifunctional X-ray photoelectron spectrometer. It was indicated that poly(ethylene glycol) with 2 wt% BP additives had better friction-reducing and anti-wear properties than the commercial lubricant additive, tricresyl phosphate. Excellent tribological performance of BPs could be ascribed to the formation of high quality boundary films that consisted of the ordered adsorption films and tribo-chemical reaction films.

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Wear and Chemistry of Lubricants

Neville¹,

Morina²

2005

Wear – Materials, Mechanisms and Practice

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Future directions of fundamental research in additive tribochemistry

Cited by 12 publications

References 59 publications

Influence of surface roughness and ZDDP additive on the friction and wear of reciprocating sliding surfaces at high contact pressures

Influence of surface roughness and ZDDP additive on the friction and wear of reciprocating sliding surfaces at high contact pressures

Benzimidazolyl phosphates as anti‐wear additives in poly(ethylene glycol) for steel/steel contacts

Wear and Chemistry of Lubricants

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