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This paper presents a study of the tribological properties of two locally developed polymeric composite materials for bearing applications. Unidirectional reinforcements by linen and jute fibres are used, each in turn, in unsaturated polyester resin. Friction and wear tests are carried out, in dry conditions, on a pin-on-disc machine.The experimental results, backed by scanning electron microscope...
Particulate strengthened cobalt-partially stabilized zirconia composites were produced by conventional electro-codeposition method. Tribological properties of the deposits were evaluated against a hardened steel disc under dry sliding conditions on a thrust bearing type disc on disc machine. Dispersion of the particles improved the hardness and tribological properties of cobalt. Load and sliding velocity...
Effects of some commercial lubricating oil additives on the tribological properties of aluminum alloy in sliding contact with bearing steel were investigated under boundary lubrication using a reciprocating wear tester. It was shown that base stock containing 1 wt.% additive is not effective at reducing the friction and wear of aluminum alloy. Furthermore, additives, except sulfurized olefin, at 5...
The synthesis of a new type of oil additive, 4,5-di(cetyl thio)-1,3-dithiol-2-thione, is described. The thermal stability of the compound was investigated by thermal gravity analysis (TGA). The tribological properties of the compound as additive in liquid paraffin were also evaluated using a four ball tester. The results show that the novel compound has good tribological properties in liquid paraffin...
Several families of liquid crystals, 4,4'-dialkyl- and dialkoxyazobenzenes, 4,4'-dialkylazoxybenzenes and cyanoaryls, have been studied as commercial oils additives. Tribiological studies have been carried out on a real time pin-on-disk machine at variable temperature and concentration. Variations in viscosity and transition temperatures have no significant effect on friction values. Friction values...
The effects of both substrate bias voltage during fabrication and countersurface materials during sliding, on the tribology of CN, films are reported. Amorphous CN, films (12–24 at.% N), about 1 μm thick, were deposited onto Si(100) substrates at 600°C by d.c. magnetron sputtering of graphite in a nitrogen plasma. Tribological behaviour of the CN x films was evaluated in continuous, unidirectional...
Four complexes of rare earth hexadecylates (La, Pr, Sm, Gd) and copper hexadecylate were synthesized. Their tribological properties as additives in lithium grease were evaluated using a four-ball machine and a ring-block tester. The results indicated that these rare earth hexadecylates possessed antiwear and friction reduction properties in lithium grease. Their antiwear and friction reduction properties...
In this paper, the tribological properties of La(OH) 3 nanocluster modified by compound containing nitrogen as additive in liquid paraffin were investigated using four-ball machine. The results show that La(OH) 3 nanocluster modified by compound containing nitrogen as additive in liquid paraffin has high load-carrying capacity, good antiwear and friction reduction properties. The lubricating...
Some potentially active heterocyclic compounds including 2-(di-n-octylaminomethyl) thiobenzoxazole were synthesized. The friction and wear behaviors of these potentially active heterocyclic compounds as additives in liquid paraffin were investigated on a four-ball machine. The tribochemical interaction between the additive and the counterface metal was explored with X-ray photoelectron spectroscopy...
This work studies the dry friction properties of sintered Al 62.5 Cu 25 Fe 12.5 samples with quasicrystalline as well as the B2 (CsCl) type structures. Friction experiments were carried out on a pin-on-disc-type tribometer. The structure of the specimens was measured by means of X-ray diffraction. Chemical compositions were obtained by means...
Based on the principle of ion-nitriding a new ion sulphuration technique was developed. Its basic process and advantages compared with the traditional electrolytic method were described. The sulphuration coating was formed mainly by a chemical conversion, not only by a diffusion process. Its thickness was generally in the range of several to several tenth micrometers. X-ray diffraction, SEM, and EDAX...
The synthesis of 2-(n-Dodecyldithio)-benzothiazole is described. Their antiwear, antifriction, extreme pressure and antioxidation performance is examined in liquid paraffin. The synthesized product has been found to exhibit appreciable antiwear. The film formed by the additive during sliding process was investigated by using X-ray photoelectron spectroscopy and EPMA.
Using a nanoindentation technique, the environmental effects were studied on the micro-hardness of sintered alumina. Friction and wear properties were also examined under lubrication with the same liquids: pH adjusted water solutions with NaOH or HCl, methanol, acetone, benzene and n-hexane. A relationship between the wear properties and the hardness changes in organic compound liquids was observed...
In order to investigate the tribological properties of the tetrazolyl group, one oil-soluble N-alkylated tetrazole derivative was synthesized. Its load-carrying capacity, anti-wear and friction reduction properties added to liquid paraffin were evaluated using a four-ball test machine and an Optimal SRV tester. The results indicate that the N-alkylated tetrazole derivative as an additive in liquid...
The hardness, elasticity, wear rate and friction coefficient of carbon nitride (CN x ) films of defined microstructure and composition are presented. CN x films were deposited by dc reactive magnetron sputtering from a C target in N 2 /Ar plasma. Films were grown on Si (001), Ni, and HSS substrates to thickness of ~0.5μm at a total pressure of 3mTorr with the N 2 fraction...
The effect of an electric current on the tribological properties of WC cemented carbide were studied. Cemented carbide bars having a composition of 90% WC, 8% Co, 1.8% TaC, 0.2% NbC with dimensions of 5x6.5x20mm were mounted in a sclerometer. A d.c. current with densities in the range of 0-90 o A/cm 2 was injected parallel to the long axis of the bar during the test. The surfaces were...
Tribological properties of Ni 3 Al-Cr 7 C 3 coatings without and with 0.2wt.% boron doping at room temperature under dry sliding were measured by using a ball-on-disc reciprocating tribotester for investigating effect of boron doping on the tribological properties. Microhardness of the coatings was measured. The worn surfaces of the coatings were examined by scanning electron...
Ni–Cr-based alloys with excellent self-lubricating property in a wide temperature range were prepared by powder metallurgical hot pressing of alloyed Ni–Cr powder, Mo, Al, Ti, B and various proportions of MoS 2 powder. The effects of MoS 2 on some mechanical and tribological properties of the alloys when rubbing with W18Cr4V high-speed steel were investigated in the temperature range...
The technique of ion implantation was employed for improving surface hardness and wear resistance of polyphenylene oxide (PPO). The samples of PPO were implanted separately with Al, Ti and Fe ions to three doses of 2×10 15 , 1×10 16 and 1×10 17 ions/cm 2 . Wear tests showed that wear-resistance of PPO was improved significantly and friction coefficient was reduced....
Cyclotriphosphazene lubricants were synthesized and the relationship between their structures and tribological properties was investigated using an optimol SRV oscillating friction and wear tester and one-way reciprocating friction tester. The elemental composition and chemical nature of the antiwear films generated on steel surface were analyzed on a scanning electron microscope with a Kevex energy...
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