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This paper is aimed to characterize the new NiCrAlMo-12.5wt. % Ag- X wt. % CaF2/BaF2 (X = 5 or 10) solid-lubricating composites, which have high strength and self-lubricity simultaneously from room temperature to 800°C and thus would be a potential candidate for aerospace bearing applications. Additionally, clarification of the influence of fluoride content on the tribological responses of this material...
High temperature solid lubricating materials show important demands in applications for moving machine assemblies under extreme operating conditions. In this study, the tribological behavior of a nickel-alloy based self-lubricating composite (82.5%nickel-alloy–12.5%Ag–5%BaF2/CaF2) against Si3N4 ball was evaluated under various temperatures and sliding speeds. Results showed that the friction coefficient...
The tribological behavior of nanocrystalline Fe88Si12 alloy in vacuum environment has been investigated compared with coarse grained counterpart. The results demonstrated that the friction coefficient of the Fe88Si12 alloy reduced with the decrease of both grain size and oxygen partial pressure. The wear resistance of the Fe88Si12 alloy improved more effective in vacuum than in air as the grain size...
In this study, three kinds of calcite calcium carbonate nanoparticles (CCNP) with different average diameters as eco-friendly grease additives were successfully fabricated via the carbonation method. The morphologies and phase compositions of the CCNP were determined via XRD, FTIR and TEM. The effects of the concentration and size of synthesized products on the tribological properties of grease have...
Imidazolium ionic liquids (ILs) containing sterically hindered phenol and benzotriazole groups were synthesized and evaluated as combined antiwear (AW), antioxidation, and anticorrosion additive in poly(ethylene glycol) (PEG) for steel/steel contacts at room temperature and 100°C. The physical properties of the synthetic ILs and PEG with the additive were measured. The antioxidation and anticorrosion...
Bronze matrix composites were prepared by the powder metallurgy technology (P/M). The tribological properties of composites sliding against AISI321 stainless steel pins were studied under sea water condition. The alumina had a strengthened effect on the hardness and wear resistance of composites, but it increased the friction coefficient of bronze material. The nickel coated graphite improved the...
In this study, we report that a layered Ti 3 AlC 2 ceramic exhibited three distinct tribological behaviors at different vacuum degrees. It is firstly found that the layered Ti 3 AlC 2 exhibited intrinsic self-lubricity under vacuum degree from 2.0×10 4 to 5Pa with the coefficient of friction (CoF) as low as 0.2 and nearly no wear. Under lower 0.1Pa and air atmosphere,...
NiAl, NiAl–Cr–Mo alloy and NiAl matrix composites with addition of oxides (ZnO/CuO) were fabricated by powder metallurgy route. It was found that some new phases (such as NiZn 3 , Cu 0.81 Ni 0.19 and Al 2 O 3 ) are formed during the fabrication process due to a high-temperature solid state reaction. Tribological behavior was studied from room temperature to...
The mechanical properties and wear behavior of an Fe 70 Ni 30 alloy with twinned martensite structure obtained by deep cryogenic treatment at −196°c (DCT) were evaluated in comparison with that of coarse-grained (CG) Fe 70 Ni 30 alloy (single austenite phase). The results showed that after the introduction of martensite with nano-scale twins, the Vickers hardness of...
Dry-sliding tribological performance of the Fe–28Al–5Cr and its composites containing 15, 25, 35, 50wt.% TiC, produced by hot-pressing process, was investigated against an AISI 52100 steel ball in ambient environment at varying applied load and sliding speed. It can be found that the coefficient of friction (COF) is irrespective of TiC content and applied load, but increases from 0.46 to 0.60 with...
The tribological properties of the nano-eutectic Fe 1.87 C 0.13 alloy are investigated under dry-sliding against AISI52100 steel ball in ambient environment with varying applied load and sliding speed. As comparison, the tribological properties of the same alloy after annealing treatment, which is with coarse-grained microstructure, also are examined at the same testing condition....
The tribological properties of a Fe 3 Al material in an aqueous solution of 1mol/l H 2 SO 4 corrosive environment sliding against a Si 3 N 4 ceramic ball are studied using an Optimol SRV oscillating friction and wear tester in a ball-on-disc contact configuration. We investigate the effects of load and sliding speed on tribological properties of the Fe 3...
A series of asymmetrical tetraalkylphosphonium ionic liquids were synthesized and evaluated as a new kind of lubricant for the contacts of steel/Al using an Optimol SRV oscillating friction and wear tester in ambient condition. The phosphonium ionic liquid shows excellent tribological performance and is superior to the conventional ionic liquids 1-ethy-3-hexylimidazolium hexafluorophosphate (P206)...
Novel ionic liquid materials based on 1-alkyl-4-[5-(alkylsulfanyl)-1,3,4-oxadiazol-2-yl] pyridinium tetrafluoroborate derivatives were synthesized. Ultra-thin ionic liquid films were prepared on silicon wafers by means of spin-coating and their tribological properties were investigated. The wear life increases when the chain length decreases. Under low load, they show good tribological properties...
SiO 2 , TiO 2 , and hydroxyapatite (HA) thin films with good biocompatibility were grown on Ti–6Al–4V (coded as TC4) substrate by sol–gel and dip-coating processes from specially formulated sols, followed by annealing at 500°C The chemical states of some typical elements in the target films were detected by means of X-ray photoelectron spectroscopy (XPS). Atomic force microscopy (AFM)...
The friction and wear behavior of a steel-on-steel contact lubricated by phosphazene-type additive tetrakis(3-trifluoromethylphenoxy)-bis(4-fluorophenoxy)-cyclotriphosphazene (X-1P) and novel synthetic bridged cyclotriphosphazenes was investigated on a oscillating friction and wear tester. The thermal stability of the lubricants was investigated by means of thermogravimetric analysis. It was found...
Abrasion is a stochastic process. It has been realized by some researchers that Monte Carlo simulation is a powerful tool to predict the wear rate of materials. The important issue for the simulation is to collect necessary basic data of worn materials, such as, ductility, plasticity, hardness, etc. The most difficult work, however, is to get parameters related to wear system. A factor, which divides...
A comparative study was carried out to investigate the microstructure and tribological behavior of Fe-Al and Fe-Al/WC iron aluminide based coatings against Si 3 N 4 under dry sliding at room temperature using a pin-on-disc tribotester. The coatings were prepared by high velocity arc spraying (HVAS) and cored wires. The effect of normal load on friction coefficient and wear rate of...
A series of S, P-containing triazine derivatives, 2,4-bis-(diethylamino)-6-(O,O'-dialkyl dithiophosphate)-s-1,3,5-triazine, which are potential environmentally friendly lubricating oil additives, were synthesized. The tribological properties as lubricating oil additives in vegetable oil were evaluated using a four-ball tester. The results show that the series of triazine derivatives possess good antiwear...
The tribological properties of FeAl intermetallics under dry sliding against AISI52100 steel at ambient conditions were studied on an Optimol SRV oscillating friction and wear tester in a ball-on-disc contact configuration. Effects of load and sliding speed on tribological properties of the FeAl intermetallics were investigated. The worn surfaces of the FeAl intermetallics were examined with a scanning...
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