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Three ceramic composite grades, consisting of a ZrO 2 matrix and 40vol.% WC, TiC 0.5 N 0.5 or TiN phase, were completely self-developed by hot pressing powder mixtures of yttria-stabilised zirconia (Y-TZP) and distinctive WC, TiC 0.5 N 0.5 or TiN powder sources. The friction and wear characteristics of the zirconia-based composites against WC–Co cemented carbide...
A number of commercially available WC-Co-based cemented carbides with 6 up to 12wt.% Co were machined and surface finished by grinding as well as by wire electrical discharge machining (EDM) in demineralised water through a number of consecutive gradually finer EDM regimes. Comparative dry reciprocating sliding wear experiments on both wire-EDM and ground samples against WC-Co pins were conducted,...
ZrO 2 -based composites containing electro-conductive secondary phases have successfully proven their feasibility for electrical discharge machining (EDM) in demineralised water. Samples of ZrO 2 –TiN composites with 40vol.% TiN were self-developed and manufactured by wire-EDM. The effect of the surface finishing condition on the tribological characteristics was investigated by comparing...
ZrO 2 -based composites with 40vol.% TiC 0.5 N 0.5 addition were processed from both nanocrystalline and micrometer sized TiC 0.5 N 0.5 starting powders by hot pressing. Flat samples were manufactured and finished by wire electrical discharge machining (EDM) in order to investigate their sliding-wear behavior against a WC-Co cemented carbide. Reciprocative sliding...
The cavitation erosion (CE) behavior of two kinds of Cr-Mn-N stainless steels was investigated by means of an ultrasonic vibration processor and compared with that of 0Cr13Ni5Mo stainless steel, commonly used material for hydraulic turbines in China. The eroded surfaces after different CE duration were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Roughness (R a ...
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...
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...
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...
The tribological properties of a series of alcohols as lubricating additives in liquid paraffin were investigated using a Timken tester with a SAE52100 steel ring sliding against an Al 2024 block. The boundary film formed on the aluminum block was studied with X-ray photoelectron spectrometry (XPS) and scanning electron microscopy (SEM). It was found that these compounds possess high load-carrying...
The friction reduction and antiwear properties of a range of organo-chlorine compounds as oil additives in mineral oil were assessed using a Timken tester with a SAE52100 steel ring sliding against an A12024 block. X-ray photoelectron spectrometry (XPS) and microscopic infrared reflectance were employed to examine the boundary film formed on the surface of the Al block. The results reveal that unsaturated...
Organic copper salts have been found to be effective additives for lubricating oils owing to their multifunctional performance. However, little attention has been paid to the comparative investigation of the behaviors of Cu(I) and Cu(II) organic salts as lubricating oil additives. In this paper, both Cu(I) and Cu(II) dialkyldithiophosphates were synthesized and their friction-reducing and antiwear...
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...
A type of C-Si-Mn nodular cast iron, used as grinding ball material, was studied. With 2.5-3.3 wt% C, 3.0-3.5 wt% Si and 2.0-2.5 wt% Mn, this type of nodular cast iron can be melted by cupola. Simple process, low cost, and high wear resistance make it more competitive as a ball material than other nodular cast irons. Heat treatment of this material was investigated at various quenching and tempering...
A ball-on-three-disc modification of the four-ball wear tester was utilized to evaluate the wear property of Si 3 N 4 lubricated with mineral oil, containing additives such as oleic acid, stearic acid and zinc dialkyldithiophosphate (ZDP). For comparison, the wear of a steel ball on Si 3 N 4 discs and an Si 3 N 4 ball on Si 3 N 4 discs...
The tribological properties of K 2 Ti 4 O 9 whisker reinforced Al-20Si aluminum matrix composites were investigated in a mode of low amplitude reciprocal sliding. The ball-on-disk tests were performed at applied loads of 20-100 N and sliding velocity of 0.09 m s -1 . The water lubricated composites demonstrated higher wear resistance and friction coefficient than...
A complex of lanthanum dialkyldithiocarbamate and phenanthroline was synthesized, and its lubricating and antiwear behaviors as an additive in lithium grease were evaluated using a Timken tester with a SAE52100 steel ring sliding under an Al 2024 block. As a comparison, the wear behavior of a steel-on-steel system under the lubrication of the same grease was also investigated under the same test conditions...
A complex of lanthanum and N-salicylidene derivative of malonic, dihydrazide (Schiff base) was synthesized, and its tribological properties as additive in lithium grease were evaluated using a block-on-ring wear tester with a SAE52100 steel ring against an Al 2024 block. The protective film formed on the rubbed surface of aluminum was investigated by SEM, XPS and AES. Friction and wear tests reveal...
The nanometer Si 3 N 4 filled polyetheretherketone (PEEK) composite blocks were prepared by compression molding. The friction and wear properties of nanometer Si 3 N 4 filled PEEK were investigated on a block-on-ring machine by running the PEEK composite block against a plain carbon steel (AISI 1045 steel) ring. The morphologies of the wear traces and the transfer film...
A 50 μm thickness polyimide (PI) film was implanted with 120 keV nitrogen ion to doses of 5 10 14 ions cm -2 and 5 10 16 ions cm -2 . The structure of the treated PI was characterized by X-ray photoelectron spectroscopy (XPS) and reflecting FT-IR, whereas the friction and wear behaviors of both implanted and unimplanted PI were investigated...
One N-salicylidene derivative of malonic dihydrazide (Schiff base) and its complexes of lanthanum and copper were synthesized. Their tribological properties as additives in lithium grease were evaluated using a four-ball machine. The results indicate that these compounds possess good load-carrying capacity, friction reduction, and anti-wear properties. In particular, the complex of lanthanum has excellent...
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