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A new manufacturing process and a new family of composite materials (bronze matrix + friction modifiers) for lubricated tribological systems, such as synchronizer rings in manual gear boxes, has been developed. The research has provided a better understanding of lubricating oil film formation and how to stabilize it by a suitable surface chemistry and morphology, as well as the ability to produce...
The synthesis of 2-(di-n-octylaminomethyl) thiobenzothiazole has been described. The thermal stability, corrosion-inhibiting and tribological characteristics of compound as additive to liquid paraffin has been evaluated. The novel compound possesses higher load carrying capacity and better antiwear performances. The tribochemical reaction of additive with metal surface was investigated by using X-ray...
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...
Tribological properties of polymeric materials were investigated with various polymer-polymer combinations by means of a pin-on-disk wear testing apparatus. The specific wear rate was related to the cohesive energy density of the polymeric materials, but that of a given polymer slider was dependent on the mated polymeric materials, and a high wear rate was observed in the sliding against a polymer...
The tribological performance of 2-(N-alkylcarbamoylmethyl)thiobenzo-thiazole as an additive to liquid paraffin has been evaluated. The novel compound possesses higher load capacity and better lubricating characteristics. The tribochemical reaction of the additive with a metal surface was investigated by X-ray photoelectron spectroscopy and scanning Auger microprobe techniques. An action mechanism...
The tribological properties of four different materials are investigated, tetragonal zirconia (Y-TZP), Al 2 O 3 , dispersed in Y-TZP (ADZ), ZrO 2 dispersed in Al 2 O 3 (ZTA) and Al 2 O 3 (with 300 ppm MgO). These materials are used as a cylinder sliding against a plate of Y-TZP (TZ-3Y)). Compared to Y-TZP, the wear resistance of ADZ composites...
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...
There has been a growing concern for the use of mineral oils because of the worldwide interest in environmental issues. This has promoted the use of ashless additives as environmental friendly lubricants. A potential ashless additive, S-[2-S-(2-hydroxylpropyl)benthiazole]dioctyldithiocarbamic acid ester, was prepared in this work. The friction and wear behaviors of the synthesized compound as an additive...
In this paper, an organic compound containing S, N, B and O elements is synthesized with the reaction of 2-mercaptobenzothiazole and chloroethanol in aqueous solution firstly, then the product reacts with butanol and boric acid in toluene solution at reflex for 6 h. Its friction and wear properties as additives in liquid paraffin were evaluated using four-ball machine and antiwear mechanisms were...
The friction and wear performance of heterocyclic compounds (2-mercaptobenzoxazole, 2-mercaptobenzothiazole and 2-mercaptobenzimidazole), which have the same cyclic structure except for the one-location atom difference, added to liquid paraffin and synthesized diester were evaluated using a four-ball machine. The results show that there is a ranking of the antiwear performance: 2-mercaptobenzoxazole>2-mercaptobenzothiazole>2-mercaptobenzimidazole,...
A TiN coating, deposited by PVD, was rubbed against corundum balls in a laboratory fretting experiment for different number of cycles. The surface composition and chemical state of the wear tracks, debris found on the TiN coating and the transfer layer on the corundum counterbody were determined with X-ray photoelectron spectroscopy and Auger electron spectroscopy. The worn surfaces in all the wear...
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.
The role of transfer phenomena in the mechanisms of friction reduction by organic molybdenum compounds is studied with the aid of ultrahigh vacuum (UHV) analytical tribometry. Additives used are zinc dithiophosphate (Zndtp), molybdenum dithiophosphate (Modtp), molybdenum dithiocarbamate (Modtc) and Modtc/Zndtp combinations. Experiments involve UHV friction tests on tribofilms formed previously and...
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...
Lanthanum hydroxide nanoparticles modified with succinimide (coded as Succ-nano La) were prepared in laboratory. The tribological behavior of the synthesized nanoparticles blended with zinc dialkyldithiophosphate (ZDDP) as additives in liquid paraffin (LP) to a total concentration of 5wt.% was investigated on a four-ball machine. The surface morphologies and elemental distributions of the worn steel...
There has been a growing concern for the use of water-based fluids because of the worldwide interest in environmental issues. This has promoted the research and use of water-soluble additives as environmental friendly lubricants. A kind of potential water-soluble additive, S-(carboxylpropyl)-N-dialkyl dithiocarbamic acid was prepared in this work. The friction and wear behaviors of the synthesized...
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...
The tribological properties of a diamond (111) pin slid on subnanometer thick Ag films, which were deposited on a cleaned Si(111) substrate, were studied using a pin-on-plate tribometer. The preparation of Ag ultrathin films and frictional experiments were performed in an ultrahigh vacuum (UHV) chamber at a pressure of 10 -8 Pa. The frictional experiments were carried out at a sliding...
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