Preparation and Structure of W/Mo Films and Their Tribological Properties in the Lubrication of MoDTC

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Xingliang Li ◽  
Wen Yue ◽  
Chengbiao Wang ◽  
Jiajun Liu ◽  
Guolong Li
Keyword(s):  
Friction And Wear ◽  
316L Stainless Steel ◽  
Synergistic Effects ◽  
Ion Beam ◽  
Energy Dispersive Spectrometer ◽  
Friction Reduction ◽  
Chemical Characteristics ◽  
Ion Beam Assisted Deposition ◽  
High Decomposition Rate ◽  
Scanning Electron

W, Mo, and W–Mo alloy films are prepared on 316L stainless steel by means of ion beam assisted deposition (IBAD). Tribological behaviors of the treated surfaces are investigated under lubrication with molybdenum dialkyldithiocarbamate (MoDTC) on a MS-T3000 friction and wear tester. The micromorphologies and chemical characteristics of the tribofilms generated on the worn surfaces are analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. The results showed that the obvious synergistic effects of better friction reduction and wear resistance between W–Mo film and MoDTC are attributed to the hard surface and the high decomposition rate of additives on the worn W–Mo surface.

Ionic Liquid Thin Films: Potential Solution to Lubricate Miniaturized Devices

2005 ◽  
Author(s):  
Qunji Xue ◽  
Bo Yu ◽  
Feng Zhou ◽  
Ping Gao ◽  
Yongmin Liang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Films ◽  
Friction Reduction ◽  
Chemical Characteristics ◽  
Potential Solution ◽  
X Ray ◽  
Substrate Surfaces ◽  
Vinyl Group ◽  
Scanning Electron ◽  
Miniaturized Devices

The tribological properties of ultra-thin ionic liquid films (IL films) were evaluated using a Universal Micro-tribometer-2MT tester. The morphologies of the wear tracks of the films and the counterpart surfaces were examined using a JEM-1200EX scanning electron microscope (SEM) equipped with a Kevex energy dispersive X-ray analyzer (EDXA) attachment. It was found that the tribological performances of IL films were closely related to the chemical characteristics of the substrate surfaces. The films of vinyl group functionalized ionic liquids on hydroxylated substrate and vinyl group modified substrate exhibited very good friction-reduction and wear-resistant properties. IL films can be a potential solution to the lubrication of miniaturized devices.

scholarly journals Surface-Treated versus Untreated Large-Bore Catheters as Vascular Access in Hemodialysis and Apheresis Treatments

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Rolf Bambauer ◽  
Ralf Schiel ◽  
Carolin Bambauer ◽  
Reinhard Latza
Keyword(s):  
Electron Microscope ◽  
Retrospective Study ◽  
Outer Surface ◽  
Bacterial Colonization ◽  
Ion Beam ◽  
Treatment Processes ◽  
Ion Beam Assisted Deposition ◽  
Biological Surface ◽  
Scanning Electron

Background. Catheter-related infections, thrombosis, and stenosis are among the most frequent complications associated with catheters, which are inserted in vessels. Surface treatment processes of the outer surface, such as ion-beam-assisted deposition, can be used to mitigate such complications.Methods. This retrospective study (1992–2007) evaluated silver-coated (54 patients) and noncoated (105 patients) implanted large-bore catheters used for extracorporeal detoxification. The catheters were inserted into the internal jugular or subclavian veins. After removal, the catheters were cultured for bacterial colonization using standard microbiologic assays. They also were examined using scanning electron microscope.Results. The silver coated catheters showed a tendency towards longer in situ time. The microbiologic examinations of the catheter tips were in both catheter types high positive, but not significant.Conclusion. The silver-coated catheters showed no significantly reduction in infection rate by evaluation of all collected data in this retrospective study. There was no association between both catheters in significantly reducing savings in treatment costs and in reducing patient discomfort. Other new developed catheter materials such as the microdomain-structured inner and outer surface are considered more biocompatible because they mimic the structure of natural biological surface.

Friction and Wear Behavior of Copper-Graphite Composite Material in High-Speed Sliding with Current

2012 ◽  
Vol 487 ◽  
pp. 411-415 ◽  
Author(s):  
San Ming Du ◽  
Fei Zhao ◽  
Yong Zhen Zhang
Keyword(s):  
Wear Mechanisms ◽  
Wear Debris ◽  
High Speed ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Energy Dispersive Spectrometer ◽  
Graphite Composite ◽  
Friction And Wear Behavior ◽  
Gcr15 Steel ◽  
Scanning Electron

In the present study, the friction and wear behaviors of copper-graphite composite against GCr15 steel in high-speed sliding with current were investigated. The worn surfaces and wear debris were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), and the wear mechanisms were discussed. It shows that the current plays an important role in the high-speed dry sliding of copper-graphite composite against GCr15 steel. With increasing current, the friction coefficient decreases, and the wear rate increases. The wear mechanisms of the copper-graphite composite are main abrasion and fatigue without current, and that of with current are main fatigue, arc ablation.

Effect of Ultrasonic Vibration on Friction and Wear Properties of GCr15/45# Steel Frictional Pairs under Oil Lubrication

2011 ◽  
Vol 295-297 ◽  
pp. 2102-2105 ◽  
Author(s):  
Yu Lin Qiao ◽  
Shan Lin Yang ◽  
Yan Zang ◽  
Dong Wang
Keyword(s):  
Friction Coefficient ◽  
Ultrasonic Vibration ◽  
Friction And Wear ◽  
Friction Reduction ◽  
Wear Volume ◽  
Oil Lubrication ◽  
Wear Properties ◽  
Friction And Wear Properties ◽  
Surface Morphologies ◽  
Scanning Electron

Ultrasonic vibration friction and wear experiments were carried out by MFT-R4000 reciprocating friction and wear tester bonded with ultrasonic device. The surface morphologies of wear scars were examined by scanning electron microscope (SEM). The influences of ultrasonic vibration on friction reduction and anti-wear properties of GCr15/45# steel frictional pairs under different loads were discussed. The experimental results showed that, the friction of GCr15/45# steel frictional pairs could be reduced by ultrasonic vibration, and the reduction of friction coefficient became more obvious as the loads increasing. The friction coefficient measured under ultrasonic vibration is 12% lower than it measured without ultrasonic vibration when the load was 50N. However, the wear of frictional pairs increased under ultrasonic vibration, and the amplitude of wear volume enlarged with the loads increase, which is 63% at the load of 50N.

Boundary Lubrication Mechanisms of Molybdenum Film by MoDTC and ZDDP Additives

2015 ◽  
Vol 713-715 ◽  
pp. 2598-2605
Author(s):  
Xing Liang Li ◽  
Wen Yue ◽  
Song Wang ◽  
Shi Qian Zhao ◽  
Xiao Tong Hou ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Steel Substrate ◽  
Ion Beam ◽  
Substrate Surface ◽  
Friction Reduction ◽  
Test Machine ◽  
Ion Beam Assisted Deposition ◽  
Reduction Property ◽  
316L Steel ◽  
Electronic Microscope

Molybdenum (Mo) film is deposited by Ion Beam Assisted Deposition (IBAD) on the 316L steel substrate surface in this experiment. The micro structure and nanohardness of the film are tested by Scanning Electronic Microscope (SEM) and nanoindentation tester. The tribological behaviors of Mo film under ZDDP and MoDTC lubrication are evaluated by SRV test machine. The tribo-film formed on the worn surfaces is investigated by X-ray photoelectron spectroscopy (XPS) to find out the tribological mechanisms between the Mo film and the two additional additives. The result shows that Mo film not only has friction reduction property but also has wear assistant property under ZDDP and MoDTC lubrication. As element Mo has advantage on promoting the deposition of these two lubricating additives.

Study on the Characteristics of Wear Resistance Using Silicate Particles as Additive on the Metal Friction Pairs

2008 ◽  
Vol 373-374 ◽  
pp. 452-455 ◽  
Author(s):  
Yang Zhao ◽  
Bin Shi Xu ◽  
Yi Xu ◽  
Pei Jing Shi ◽  
Xiao Li Wang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Friction And Wear ◽  
Energy Dispersive Spectrometry ◽  
The Self ◽  
Friction Reduction ◽  
Good Effect ◽  
Protective Film ◽  
Worn Surface ◽  
Scanning Electron ◽  
Metal Friction

Tribological properties of silicate particles as 50CC additive were evaluated on an end-face friction and wear tester. The morphologies, element distributions and micro-mechanical properties of the worn surface were investigated by means of scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and nanoindentation tester, respectively. Results indicate that friction reduction and wear resistance properties of 50CC are improved effectively by adding silicate particles, whose main composition is Mg3[Si2O5](OH)4. The friction coefficient and surface temperature are reduced 60.6% and 35.6%. The nano-hardness of the self-repairing film is increased 30.03% compared with that of the ordinary film. It can be inferred that a high nano-hardness protective film composed of Mg, Al and O is formed on the worn surface, which has a good effect on the tribological performances.

In Situ Ion Beam Cleaning in a Cambridge S-200 SEM

1990 ◽  
Vol 48 (2) ◽  
pp. 266-267
Author(s):  
F.C. Laabs
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ion Beam ◽  
Energy Dispersive Spectrometer ◽  
Ion Bombardment ◽  
Structural Deformation ◽  
Argon Ion Bombardment ◽  
Argon Ion ◽  
Scanning Electron

The increased use of the scanning electron microscope as a flexible analytical tool has resulted in applying its use to a variety of problems which utilize signals that originate or are controlled by surface properties, including crystallographic orientation, contamination and structural deformation of the surface layer. This paper describes results and observations of efforts to control and remove that layer by energetic argon ion bombardment.Experimental A Kratos Mini-Beam I ion gun was attached to a Cambridge Model S-200 scanning electron microscope utilizing the horizontal port normally occupied by an energy dispersive spectrometer (Figure 1). The EDS spectrometer was moved to a position 35 degrees above the port position. This configuration results in the ion gun lying in a plane perpendicular to the electron beam and 45 degrees to the tilt axis, necessitating tilting the sample toward the ion beam during ion bombardment and, importantly, sputtered material is directed away from the EDS detector.

Ultrastructural Features of Normal and Diseased Hair Revealed by Ion Beam Etching and Freeze Fracture

1975 ◽  
Vol 33 ◽  
pp. 358-359
Author(s):  
M. Spector ◽  
A. C. Brown
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ectodermal Dysplasia ◽  
Ion Beam ◽  
Freeze Fracture ◽  
Ion Current ◽  
Ion Beam Etching ◽  
Pili Torti ◽  
Argon Ion ◽  
Scanning Electron

Ion beam etching and freeze fracture techniques were utilized in conjunction with scanning electron microscopy to study the ultrastructure of normal and diseased human hair. Topographical differences in the cuticular scale of normal and diseased hair were demonstrated in previous scanning electron microscope studies. In the present study, ion beam etching and freeze fracture techniques were utilized to reveal subsurface ultrastructural features of the cuticle and cortex.Samples of normal and diseased hair including monilethrix, pili torti, pili annulati, and hidrotic ectodermal dysplasia were cut from areas near the base of the hair. In preparation for ion beam etching, untreated hairs were mounted on conducting tape on a conducting silicon substrate. The hairs were ion beam etched by an 18 ky argon ion beam (5μA ion current) from an ETEC ion beam etching device. The ion beam was oriented perpendicular to the substrate. The specimen remained stationary in the beam for exposures of 6 to 8 minutes.

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