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PbS nanoparticles of average diameter about 5 nm, which were surface-modified with dialkyldithiophosphate (DDP), were prepared by chemical synthesis. The synthesized DDP-coated PbS nanoparticles were characterized by infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and electron diffraction (ED). The antiwear ability of the coated PbS nanoparticles...
Several rare earth coordination compounds of 8-hydroxyquinoline and of di-n-hexadecyldithiophosphate were synthesized. The burnished films of these coordination compounds on a GCr15 bearing steel (SAE 52100 steel) disc were prepared. The friction-reducing behaviors of the burnished films were evaluated on a DF-PM friction tester. The friction-reducing behaviors of these complexes as additives in a...
The composites of polyphenylene sulfide (PPS) filled with 1-3 μm size ceramic particles of Al 2 O 3 , SiC, Si 3 N 4 , and Cr 3 C 2 were prepared by compression molding. The hardness and the friction and wear behaviors of these composites were studied. For the latter a pin-on-disc friction and wear tester was used and sliding was performed between 5 mm...
Cast Fe-Mo-S wear-resistant alloy with and without CeO 2 was prepared with a medium frequency inducting oven. The effect of CeO 2 on the friction and wear properties of the alloy was examined with a block-on-ring friction and wear tester. The action of CeO 2 in the formation of surface film and its effect on the characteristics of the surface film were investigated by means...
The effects of some rare earth compounds on the corrosion resistance and/or the tribological properties of a phenolic/epoxy-resin-MoS 2 bonded solid film, a phenolic/epoxy-resin-MoS 2 -C (graphite) bonded solid film, a lithium grease, and a lubricating paste were investigated. The action of rare earths as lubricating additives was explored, while the applications of rare earth lubricants...
The tribological behaviours of the complexes in the title as additives in water were investigated in Part 1 of this work. Here in Part 2 their antiwear and extreme pressure properties as additives in liquid paraffin are dealt with and compared with the commercially available ester of di-n-dodecyl-polyethylene-epoxyphosphate. Their antiwear and extreme pressure properties in liquid paraffin were evaluated...
Four oil-water double soluble salts of lanthanum and zinc di-n-dodecyl-polyethylene-epoxyphosphate (coded as AEO-3-La, AEO-7-La, AEO-9-La and AEO-7-Zn, respectively) were prepared. These synthetic compounds and the ester of di-n-dodecyl-polyethylene-epoxyphosphate (coded as AEO-7-ester), obtained from commercial sources, were identified by elemental analysis, H 1 and 31 P nuclear...
Compared with other metal fluorides, the rare earth trifluorides (mainly refers to the trifluorides of light rare earths such as La, Ce, Gd, etc.) are more thermally and chemically stable. Therefore, some rare earth trifluorides have been used as high temperature solid lubricants. For example, LaF 3 and CeF 3 have been applied in lubricating greases and bonded films recently. But the...
Flame spraying nickel-based alloy coatings containing CeO 2 or without it were prepared. A Shimazu-M model microhardness tester and a D-Max/RB model X-ray diffractometer (all made in Japan) were performed to determine the microhardness and phase structure of the coatings respectively. A block-on-ring friction and wear tester (similar to Timken tester, made in China) was used to examine the...
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