Surface Characterization of Polymer Composite Using Bearing Area Curve

2010 ◽  
Author(s):  
Lorena Deleanu ◽  
Gabriel Andrei ◽  
Laura Maftei
Keyword(s):  
Retention Index ◽  
Surface Characterization ◽  
Tribological Behavior ◽  
Fluid Retention ◽  
Average Pressure ◽  
Glass Spheres ◽  
Test Parameters ◽  
Surface Topographies ◽  
Pin On Disk

This paper presents an analysis of several 3D parameters based on bearing area curve in order to use the information for establishing the influence of sliding regime against steel on the tribological behavior of a composite class with polyamide matrix and 1% of black carbon. There were done pin-on-disk tests for different concentrations of micro glass spheres (MGS): 2.5, 5, 10, 20, 30 and 50% (wt), respectively. The polymer was tested under similar conditions in order to have a reference basis and to point out the improvement in tribological behavior when adding this reinforcement material. The surface topographies were registered with the help of PRO500 3D (stylus) Profilometer. The test parameters in dry regime were: sliding speed 0.5, 1.0 and 1.5 m/s, average pressure 1, 2 and 3 MPa, respectively. There were analyzed the influence of MGS concentration and sliding regime on wear as mass loss of the composite discs, after 10,000 m of sliding, the friction coefficient and several 3D parameters related to the bearing area curve, determined from raw profiles (surface bearing index – Sbi, core fluid retention index – Sci, valley fluid retention index, Svi, reduced summit height, Spk, core roughness depth, Sk, and reduced valley depth, Svk).

Coated Valve Train Components and Low Emission Engine Oils in a Fired Engine Enviroment

2005 ◽  
Author(s):  
Ewa Bardasz ◽  
Christopher G. Scott ◽  
Susan V. Cowling ◽  
James C. Matasic
Keyword(s):  
Tungsten Carbide ◽  
Physical Vapor Deposition ◽  
Surface Characterization ◽  
Valve Train ◽  
Chromium Nitride ◽  
Engine Oils ◽  
Test Parameters ◽  
Low Emission ◽  
Heavy Duty Diesel

A series of heavy-duty diesel, fired engine tests were run using coated valve train components in combination with low emission diesel engine crankcase oils. Examination of coated rocker arm and corresponding, uncoated crosshead surfaces, showed that greater crosshead wear was encountered using a physical vapor deposition (PVD) chromium nitride coating, as compared with that observed using a tungsten carbide PVD composition, or an uncoated rocker arm surface. Good coating adhesion was observed with both coatings, with no adverse effects on neighboring, uncoated surfaces. Tungsten carbide in combination with the first of two low-emission engine oils out performed either of the oils used in combination with chromium nitride. Test parameters are summarized along with key engine data obtained. Observations from surface characterization of representative rocker arm and mating crosshead components, using optical and scanning electron microscopy coupled with energy dispersive spectrometry also are highlighted and discussed.

scholarly journals Tribological Behavior and Surface Characterization of Gray Cast Iron-EN31 Steel under Lubricated Sliding Conditions

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
S. Ananth ◽  
P. Sivaprakasam ◽  
J. Udaya Prakash ◽  
P. Maheandera Prabu ◽  
Varatharaju Perumal ◽  
...  
Keyword(s):  
Cast Iron ◽  
Surface Characterization ◽  
Gray Cast Iron ◽  
Tribological Behavior ◽  
Research Work ◽  
Lubricating Oil ◽  
Gray Cast ◽  
Fluid Properties ◽  
Lubricated Sliding

This research investigates the tribological behavior of gray cast iron against EN31 steel under lubricated conditions. The most typical lubricated sliding phenomena are the reduction of wear on both the sliding surfaces and any one of the critical surfaces. Static and hydrodynamic wear can be reduced based on fluid properties or the accessibility of fluid between the surfaces. The oil’s viscosity or content of the hydrocarbon and additives present in the oil plays a major role in controlling the wear of reciprocating surfaces. Therefore, this research work focused on metal-to-metal contact wear under the influence of lubricating oil (40 pride oil). The Taguchi method was used to select the sliding parameter combinations. Lubricated sliding resulted in a relatively reduced order of friction coefficient, attributable to better load distribution due to the formation of the lubricant film.

scholarly journals Chemical and Topographic Analysis of Eight commercially Available Dental Implants

2016 ◽  
Vol 17 (5) ◽  
pp. 354-360 ◽  
Author(s):  
Mogammad Thabit Peck ◽  
Bruno R Chrcanovic
Keyword(s):  
Dental Implants ◽  
Surface Characterization ◽  
Biological Response ◽  
Mean Value ◽  
Surface Chemical ◽  
Implant Surface ◽  
Topographic Analysis ◽  
X Ray ◽  
Surface Topographies

ABSTRACT Background Surface characterization of dental implants allows us to better understand the effects of the implant on the host biological response. In this study, we analyzed and compared these characteristics among implants commercially available in South Africa. Materials and methods Eight implants from different manufacturers were chosen for analysis (Touareg, ICE, (R)Evolutions, Uniti, AnyRidge, MIS, Ivory-QSI, Southern), using scanning electron microscopy (SEM), interferometry, and energy dispersive X-ray spectroscopy to study the surface chemical composition and morphology. Results The results indicate that variations in manufacturer processes result in implant surfaces that are distinctly different from one another. Most implants presented a moderately rough surface with sandblasted-only implant surfaces having a lower mean value of Sa when compared with sandblasted and acidetched surfaces. Carbon contamination was detected on all the implants and that of aluminum on five implant surfaces. Ca and P were detected on the surface of Touareg implants, indicating the manufacturer's attempt to enhance osseointegration. Conclusion The surface of the implants showed a range of chemical, physical properties, and surface topographies. Clinical significance The results indicate that implant surface treatment is not standardized. This may have clinical implications. Further clinical research is required. How to cite this article Peck MT, Chrcanovic BR. Chemical and Topographic Analysis of Eight commercially Available Dental Implants. J Contemp Dent Pract 2016;17(5):354-360.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Surface Characterization of Functionalized Imidazolium-Based Ionic Liquids

Langmuir ◽  
2008 ◽  
Vol 24 (17) ◽  
pp. 9500-9507 ◽  
Author(s):  
Claudia Kolbeck ◽  
Manuela Killian ◽  
Florian Maier ◽  
Natalia Paape ◽  
Peter Wasserscheid ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Surface Characterization

scholarly journals Characterization of Steel Slag Filler and Its Effect on Aging Resistance of Asphalt Mastic with Various Aging Methods

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 869
Author(s):  
Minghua Wei ◽  
Shaopeng Wu ◽  
Haiqin Xu ◽  
Hechuan Li ◽  
Chao Yang
Keyword(s):  
Particle Size ◽  
Surface Characterization ◽  
Steel Slag ◽  
Self Healing ◽  
Limestone Filler ◽  
Asphalt Mastic ◽  
Pore Characterization ◽  
Asphalt Mastics ◽  
Healing Property

Steel slag is the by-product of the steelmaking industry, the negative influences of which prompt more investigation into the recycling methods of steel slag. The purpose of this study is to characterize steel slag filler and study its feasibility of replacing limestone filler in asphalt concrete by evaluating the resistance of asphalt mastic under various aging methods. Firstly, steel slag filler, limestone filler, virgin asphalt, steel slag filler asphalt mastic and limestone filler asphalt mastic were prepared. Subsequently, particle size distribution, surface characterization and pore characterization of the fillers were evaluated. Finally, rheological property, self-healing property and chemical functional groups of the asphalt mastics with various aging methods were tested via dynamic shear rheometer and Fourier transform infrared spectrometer. The results show that there are similar particle size distributions, however, different surface characterization and pore characterization in the fillers. The analysis to asphalt mastics demonstrates how the addition of steel slag filler contributes to the resistance of asphalt mastic under the environment of acid and alkaline but is harmful under UV radiation especially. In addition, the pore structure in steel slag filler should be a potential explanation for the changing resistance of the asphalt mastics. In conclusion, steel slag filler is suggested to replace limestone filler under the environment of acid and alkaline, and environmental factor should be taken into consideration when steel slag filler is applied to replace natural fillers in asphalt mastic.

scholarly journals Compositional, structural, and surface characterization of heat-treated halloysite samples: Influence of surface treatment on photochemical activity

2021 ◽  
Vol 212 ◽  
pp. 106222
Author(s):  
Balázs Zsirka ◽  
Veronika Vágvölgyi ◽  
Katalin Győrfi ◽  
Erzsébet Horváth ◽  
Róbert K. Szilágyi ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Surface Characterization ◽  
Photochemical Activity ◽  
Heat Treated
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