Antifriction and wear resistance of tin diffusion coating on brass

After brass is coated with tin, heat treatment makes the coating metal Sn and the substrate metallic elements Cu and Zn diffuse with each other. This causes the coating composition to be changed and the interface to be strengthened. The diffusion coating with a multiphase structure formed by this process has excellent properties of antifriction and wear resistance. With the aid of scanning electron microscopy, electronic probe microanalysis and X ray diffraction, the mechanism of the properties is discussed.

The new antifrictional epoxidographitofluoroplastic materials, reinforced by clothes

The antifrictional polymeric compounds on the base of epoxy binder are received. There are tribotechnical, mechanical, physico-chemical and thermal compounds properties have been researched. The production methods of epoxidographitofluoroplastic materials, rienforced by clothes from tribotechnical goods are proposed.

Novel Approach for Improved Tribological Behavior of Biodiesel Soot in Liquid Paraffin

To improve the tribological behavior of biodiesel soot(BDS) in liquid paraffin(LP), the order of biodiesel soot was increased through thermally oxidized treatment at 500 ℃, and the oil solubility was then improved through a modification using oleylamine(OLA). The BDS and thermally oxidized oleylamine-modified BDS(T-BDS-OLA)were characterized through various methods including the use of TG, FETEM, Raman spectroscopy, FTIR, and a zeta potentiometer. The tribological properties and mechanisms of the BDS before and after the thermally oxidized treatment modification were investigated using a ball-on-disc reciprocating tribometer, FESEM, 3 D laser-scanning microscopy, and Raman spectroscopy. The results showed that T-BDS-OLA has a higher degree of order than the BDS, with an onion-like microstructure. BDS and T-BDS-OLA can both improve the antifriction and antiwear properties of LP at a soot content of 0.1%-0.4%, while T-BDS-OLA in LP shows better antifriction and antiwear properties than BDS. The tribological mechanisms can be attributed to both types of soot acting as spacing and roll bearing between the friction surfaces. In addition, the exfoliated graphitic sheets from T-BDS-OLA can form a carbon lubrication layer providing easy sliding.

Molybdenum Dithiocarbamates:A New Approach to "Old" Technology

A new method for the preparation of dinuclear molybdenum dithiocarbamates(MoDDCs) is reported.This new method allows for the control of the amount of sulfurization of the Mo2SxO4-x core(x = 1 to 4) in the dinuclear MoDDCs.This control assists in the tailoring of specific tribological properties of the MoDDCs in both greases and lubricating oils.

Investigation of the Anisotropic Morphology-Induced Effects of the Slippery Zone in Pitchers of Nepenthes alata

Plant of carnivorous genus Nepenthes alata has evolved specific pitchers to prey insects for survival in the barren habitat, especially its slippery zone. The excellent slippery function has received considerable interest because of its potential applica- tion in antifriction surface design. The surface morphologies of intact and de-waxed slippery zones were characterized using scanning electron microscope and scanning white-light interferometer. Hierarchical structures with anisotropic micro- lunate structure and nano- wax crystals were found on the slippery zone. Due to the hierarchical structures, the slippery zone is hy- drophobic. It shows a significant anisotropic wettability with static contact angles 153.3° and 140.1° in the directions perpen- dicular and parallel to the upward direction （toward the peristome）, respectively. The sliding angles are -3° and -10° in the downward and upward directions, respectively. Crawling experiments indicate that the microscopic surface roughness and the brittleness of the wax crystals may reduce insect attachment in different modes according to the insect mass differences. Moreover, artificial slippery surfaces inspired by the slippery zone of Nepenthes alata were fabricated. Traction experiments quantitatively verified that the friction force of replicated lunate structures with Ra-2.54 μm surface roughness was reduced by about 25% as compared to flat surface with Ra-0.56 μm surface roughness for cricket claws.

Inorganic nanomaterial lubricant additives for base fluids,to improve tribological performance:Recent developments

In this paper,we review recent research developments regarding the tribological performances of a series of inorganic nano-additives in lubricating fluids.First,we examine several basic types of inorganic nanomaterials,including metallic nanoparticles,metal oxides,carbon nanomaterials,and"other"nanomaterials.More specifically,the metallic nanoparticles we examine include silver,copper,nickel,molybdenum,and tungsten nanoparticles;the metal oxides include CuO,ZnO,Fe_(3)O_(4),TiO_(2),ZrO,Al_(2)O_(3),and several double-metal oxides;the carbon nanomaterials include fullerene,carbon quantum dots,carbon nanotubes,graphene,graphene oxides,graphite,and diamond;and the"other"nanomaterials include metal sulfides,rare-earth compounds,layered double hydroxides,clay minerals,hexagonal boron nitride,black phosphorus,and nanocomposites.Second,we summarize the lubrication mechanisms of these nano-additives and identify the factors affecting their tribological performance.Finally,we briefly discuss the challenges faced by inorganic nanoparticles in lubrication applications and discuss future research directions.This review offers new perspectives to improve our understanding of inorganic nano-additives in tribology,as well as several new approaches to expand their practical applications.

M0S_(2) nanoparticles grown on carbon nanomaterials for lubricating oil additives

In this study,the nanocomposites of MoS_(2) nanoparticles(NPs)grown on carbon nanotubes(MoS_(2)@CNT),graphene(MoS_(2)@Gr),and fullerene C60(MoS_(2)@C60)were synthesized,characterized,and evaluated for potential use as lubricant additives.By using the benefit of the synergistic effect between MoS_(2) and carbon nanomaterials(CNMs),these nanocomposites can be well dispersed in polyalkylene glycol(PAG)base oil and show superior stability compared with pure MoS_(2) NPs.Moreover,the dispersions of MoS_(2)@CNT,MoS_(2)@Gr,and MoS_(2)@C60 added in PAG have noticeably improved friction reducing and antiwear(AW)behaviors at elevated temperature for comparison with that of PAG and PAG containing CNT,Gr,C60,and M0S2 NPs,respectively.The enhanced lubricating properties of these nanocomposites were also elucidated by exploring the tribofilm formed on the disc.