Friction and wear experiments were carried out with nanoscale serpentine (magnesium silicate mineral) and magnesium hexasilicate powder as lubricating oil additives at 400 °C. The tribological test results showed that the self-repairing protective layers could be well formed on the contact surfaces, whether nanoscale serpentine or magnesium hexasilicate powder was added into lubricating oil. The SEM and EDAX analysis demonstrate that the morphology and elements of both self-repairing layers are in accordance with each other. The research results indicate that the essence of self-repairing of serpentine power is isomorphic replacement and tribochemical reaction between magnesium silicate and metal matrix.
Abstract Friction and wear experiments were carried out with nanoscale serpentine (a magnesium silicate mineral) and heat-treated serpentine as lubricating oil additives at 400 °C. The tribological test results showed that the self-repairing protective layers could be well formed on the contact surfaces, whether nanoscale serpentine or heat-treated serpentine powder was added into lubricating oil. SEM and EDAX analysis demonstrate that the morphology and elements of self-repairing layers are in ...
Last. Yi-Xiong Wu(SJTU: Shanghai Jiao Tong University)H-Index: 1
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Abstract The effect of Cu nanoparticles (NPs) on the tribological behaviors of serpentine powders (SPs) suspended in diesel oil was investigated. Results show that the optimum mass ratio of Cu NPs to SPs is 7.5:92.5. With the addition of the above mixture to oil, the tribological properties can be significantly improved compared with those of the oil containing SPs alone. A more smooth and compact tribofilm has formed on the worn surface, which is responsible for the further reduced friction and...
#1Rashmi R Sahoo(IISc: Indian Institute of Science)H-Index: 4
#2Sanjay K Biswas(IISc: Indian Institute of Science)H-Index: 15
Tribology of a well known solid lubricant molybdenum disulphide is studied here in water and oil medium, over a large range of contact dimensions. Lateral force microscopy is used to identify the deformation modes, intra-crystalline slip, plastic grooving, fragmentation and fracture, of single particles The medium and agglomeration were found to dictate the deformation mode Steel on steel tribology lubricated by suspensions of these particles in liquid media was conducted over a range of contact...
Abstract This paper presents a PTFE/serpentine solid lubricant composite that exhibits low friction coefficient and low wear rate. It is postulated that synergistic effect alters the dominant wear mechanism of PTFE matrix. In order to examine the influence of serpentine content on tribological properties of PTFE/serpentine composite, six blends of PTFE with serpentine (in the range of 0–30 wt.%) were evaluated using a MMU-5G friction and wear tester. Tests were carried out in standard laboratory...
Last. Zhimin Bai(China University of Geosciences)H-Index: 9
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The effect of surface-coated ultrafine powders (UFPs) of serpentine suspended in lubricants on the tribological behaviors of a mated 1045 steel contact was investigated. Through the addition of serpentine UFPs to oil, the wear resistance ability was improved and the friction coefficient was decreased. The addition of 1.5 wt% serpentine to oil is found most efficient in reducing friction and wear. The nano-hardness and the ratio of hardness to modulus of friction surface are observably increased....
Friction/wear on a worn surface of 1045 steel ring was examined by using an AMSLER friction/wear tester to investigate the self-repairing characteristics of a superfine powder of hydroxyl magnesium silicate as a lubricant additive.The surface topographies and composition of the worn surface lubricated with two kinds of lubricants were analyzed by scanning electron microscope,energy dispersive X-ray analysis and X-ray photoelectron spectroscopy,respectively.The results show that many scratches ap...
#1Xiaodong He(MSU: Montana State University)H-Index: 4
#2Xianming Shi(MSU: Montana State University)H-Index: 39
Abstract The development of effective anticorrosion pre-treatments for metallic substrates is an issue of great importance for durability of metal structures and components. In this work, we proposed and demonstrated the concept of self-repairing coating for corrosion protection of aluminum alloys, using cagelike oil core/silica gel shell particles. These micron-scale, cagelike smart microspheres with opened and closed pores were successfully fabricated, and at the same time encapsulated repairi...
Nanocontainers with a shell possessing controlled release properties can be used to fabricate a new family of active coatings that can respond quickly to changes in the coating environment or the coating's integrity. The release of corrosion inhibitors encapsulated within nanocontainers is triggered by the corrosion process, which prevents the spontaneous leakage of the corrosion inhibitor out of the coating. Moreover, if different types of nanocontainers loaded with the corresponding active age...
Pellets were formed by compacting MoS2 powder. A series of tests were conducted on a tribometer that consisted of simultaneous pellet-on disk and pad-on disk sliding contacts. The purpose of the tests was to intentionally transfer MoS2 third-body particles to a disk where its lubrication characteristics could be studied. This work also showed that the MoS2 pellet actually acted as a self-repairing, self-replenishing, oil-free lubrication mechanism. In the experiment, a pellet is sheared against ...
Friction and wear properties of 1 045 steel pairs were investigated by MM-200 friction and wear tester under lubricated condition with serpentine additives.The surface topographies and compositions of the worn surface of 1 045 steel rings were analyzed by SEM,EDAX and XPS.The depth analysis of chemical constitution of the self-repairing film was conducted by sputterion method for investigation of the longitudinal distribution of the main component.The additives obviously reduced the wear of the ...
#1Nikhil Kumar(IITD: Indian Institute of Technology Delhi)H-Index: 2
#2Vinay Saini(IITD: Indian Institute of Technology Delhi)H-Index: 6
Last. Jayashree Bijwe(IITD: Indian Institute of Technology Delhi)H-Index: 52
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Abstract The maiden effort to explore the potential of nanoparticles (NPs) of Talc to improve the tribo-performance of Li-based grease is reported. A series of greases, including NPs of Talc in various amounts (1, 2, 3, and 4 wt. %), was developed. It was evaluated for the rheological, thermal and tribological viz. antiwear (AW), anti-friction (AF) and extreme-pressure (EP) characteristics. The highest tribological performance improvement was obtained at an optimum dosage of 2 wt.% with an enhan...
Abstract null null The morphology, thermal stability, phase composition, chemical groups of nanoparticles were characterized, and appropriate thermal process maintains layered structure and weakens the interlayer interaction of the MSH-AHT400. The tribological performances of MSH-AHT400 as lubricant additive are improved due to the decrease of interlaminar shear strength of nanoparticle. Usage of the as-synthesized nanoparticle leads the formation of a-C tribofilm with higher degree of graphitic...
Abstract Natural attapulgite nanofibers were added into lubricating oil to improve the tribological behaviors. Orthogonal experiment design was performed to study the effects of load, frequency, duration and concentration on the tribological properties of the additive by SRV reciprocating wear tester. Results indicate that the order that affects the tribological performances of the additive is load, concentration, frequency and duration. A tribolayer consisting of oxides, ceramics, silicates and...
Lubricants are widely used in various mechanical systems for reducing heat and friction between the working components having relative motions. Thus, the enhancement of lubricant oil properties will play a vital role in the context of protecting machinery from highly probable damages and minimizing energy losses. The development of modern lubricants and their proper use are of great importance for managing economy and the environment. In general, nano-sized particles dispersed in the lubricants,...
Abstract A series of nano-oils containing nano-particles (NPs) of talc (≈50 nm size) in varying amounts (0.5, 1, 2, 3 and 4 wt%) and dispersant (1%) was developed. Apart from physical properties, they were evaluated for anti-wear (AW) and extreme-pressure (EP) performance on a 4 ball tester since tribo-potential of nano-talc particles are not explored in the literature. The optimum amount for the best performance was around 2–3 wt % and the enhancements in AW and EP performance were 42% and 122%...
Abstract The effect of serpentine natural mineral powder as additive on the friction and wear of tin bronze against steel under oil lubrication was investigated by four-factor and three-level orthogonal experiments using SRV4 sliding wear tester. Results show that the tribological properties of tin bronze were remarkably improved by the addition of serpentine powder into the oil. The importance order that affects the friction reducing performance was load, serpentine content, reciprocating frequ...
Natural serpentine powders are applicable as additives for various lubricating oils. However, no uniform theories explain their tribological performance, lubrication, and wear mechanism, especially their self-repairing mechanism. Herein, the influence of different nano serpentine powders (NSPs) contents in liquid paraffin on the friction and wear characteristics of steel balls and the self-repairing process of NSPs on the worn surface were studied. Results show that the optimal amount of NSPs wa...
Abstract The primary role of lubricant oil is to reduce friction and wear of rubbing interface. However, these lubricants often cannot meet the performance requirements of relatively sliding mechanical elements due to the change in viscosity over the period of time and operating conditions. This article summarizes the recent progress on the friction and wear reduction mechanisms of different additives suspended in the lubricant oils. Further, the role of hygroscopic lubricant oil film of dispers...
In this study, we use an aqueous solution synthesis method to prepare silver perrhenate powders and suspend them into a poly alpha olefin (PAO) base oil with polyoxyethylene octylphenyl ether. Four ball tests and ball-on-disk reciprocating mode are performed to determine how silver perrhenate performs tribologically as a lubricating additive over a wide range of temperatures. The physical and chemical properties, as well as the lubricating mechanisms of the silver perrhenate additive, are charac...
