Effect of fullerene black additives on boundary sliding friction of steel counterbodies lubricated with mineral oil

2012 ◽  
Vol 33 (2) ◽  
pp. 94-100 ◽  
Author(s):  
D. G. Tochil’nikov ◽  
A. N. Kupchin ◽  
A. I. Lyashkov ◽  
S. A. Ponyaev ◽  
A. A. Shepelevskii ◽  
...  
Keyword(s):  
Sliding Friction ◽  
Mineral Oil ◽  
Fullerene Black ◽  
Boundary Sliding

Tribological properties of fluoroplastics modified with fullerene black in sliding friction with water lubrication

2007 ◽  
Vol 80 (8) ◽  
pp. 1438-1440 ◽  
Author(s):  
B. M. Ginzburg ◽  
D. G. Tochil’nikov ◽  
A. K. Pugachev ◽  
V. M. Oichenko ◽  
Sh. Tuichiev ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Sliding Friction ◽  
Water Lubrication ◽  
Fullerene Black

Scuffing Initiation, Scuffing Propagation and Pitting of a Four-Ball Tribosystem Lubricated With Mineral and Synthetic Oils

2005 ◽  
Author(s):  
Waldemar Tuszynski ◽  
Witold Piekoszewski ◽  
Marian Szczerek
Keyword(s):  
Sliding Friction ◽  
Mineral Oil ◽  
Oil Viscosity ◽  
Polyol Ester ◽  
Base Oils ◽  
Synthetic Hydrocarbon ◽  
Hydrocarbon Oil

The research aimed at finding an effect of various base oils on the scuffing initiation, scuffing propagation and pitting. The following base oils were tested: mineral oil, synthetic hydrocarbon oil (polyalphaolefins), synthetic non-hydrocarbon oils (polyol ester, polyglycol) and highly refined mineral one known as a white oil. The tests were performed in two different four-ball testers. One was used to investigate scuffing at pure sliding friction. The second instrument was employed to test pitting at rolling movement. To avoid an effect of the oil viscosity, base oils having similar viscosities ν100 (3,8 – 5,5 mm2 s−1) were compared. In this group the highest load causing the scuffing initiation is given by the polyglycol, and the lowest one — by polyalphaolefins and white oil. The scuffing propagation is similar for all the oils. The best resistance to pitting is given by the mineral oil, and the worst — by the white oil.

The Resistance to Scuffing, Seizure and Pitting as a Result of the Chemistry of Lubricating Oils

2005 ◽  
Author(s):  
Waldemar Tuszynski ◽  
Remigiusz Michalczewski ◽  
Edyta Osuch-Slomka ◽  
Marian Szczerek
Keyword(s):  
Chemical Composition ◽  
Sliding Friction ◽  
Mineral Oil ◽  
Great Care ◽  
Organic S ◽  
Lubricating Oils ◽  
Surface Fatigue ◽  
Worn Surface

The research aimed at finding an effect of the type and concentration of lubricating additives on the resistance of a tribosystem to scuffing, seizure and pitting (surface fatigue). Lubricating oils of various chemical composition were tested. A base mineral oil was blended with commercial packages of lubricating additives of AW and EP type, at different concentrations. The AW additives contained ZDDP, and EP ones — organic S-P compounds. The tests were performed in two different four-ball testers. One was used to investigate scuffing and seizure at pure sliding friction. The second instrument was employed to test pitting at rolling movement. It is shown that although the lubricating additives improve the resistance to scuffing and seizure, great care must be taken when increasing their content, since at higher concentrations they accelerate pitting. SEM, EDS, GDOES and FTIRM analyses of the worn surface were performed to find the reason.

Tribological properties of polytetrafluoroethylene modified with fullerene black in dry sliding friction

2006 ◽  
Vol 79 (9) ◽  
pp. 1518-1521 ◽  
Author(s):  
B. M. Ginzburg ◽  
D. G. Tochil’nikov ◽  
A. A. Shepelevskii ◽  
A. M. Leksovskii ◽  
Sh. Tuichiev
Keyword(s):  
Tribological Properties ◽  
Sliding Friction ◽  
Dry Sliding ◽  
Fullerene Black ◽  
Dry Sliding Friction

Examination of Fracture Interfaces in Silicon Nitride

1975 ◽  
Vol 33 ◽  
pp. 60-61
Author(s):  
Nancy J. Tighe
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Slow Crack Growth ◽  
Ceramic Materials ◽  
Grain Boundary Sliding ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

Critical Levels of Mineral Oil Affecting the Absorption of Vitamin A

1952 ◽  
Vol 20 (4) ◽  
pp. 587-594 ◽  
Author(s):  
Frederick Steigmann ◽  
Hans Popper ◽  
Hattie Dyniewicz ◽  
Irene Maxwell
Keyword(s):  
Vitamin A ◽  
Mineral Oil ◽  
Critical Levels
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