Closure to “Discussion of ‘A Wear Equation for Bonded Solid Lubricant Films: Estimating Film Wear Life’” (1970, ASME J. Lubr. Technol., 92, pp. 279–280)

1970 ◽  
Vol 92 (2) ◽  
pp. 280-280 ◽  
Author(s):  
E. F. Finkin
Keyword(s):  
Solid Lubricant ◽  
Wear Life ◽  
Lubricant Films ◽  
Solid Lubricant Films

Wear life and adhesion of solid lubricant films on laser-textured steel surfaces

Wear ◽  
2009 ◽  
Vol 267 (5-8) ◽  
pp. 1203-1207 ◽  
Author(s):  
L. Rapoport ◽  
A. Moshkovich ◽  
V. Perfilyev ◽  
A. Gedanken ◽  
Yu. Koltypin ◽  
...  
Keyword(s):  
Solid Lubricant ◽  
Wear Life ◽  
Lubricant Films ◽  
Steel Surfaces ◽  
Solid Lubricant Films

Friction and Wear of MoS2 Films on Laser Textured Steel Surfaces

2008 ◽  
Author(s):  
Lev Rapoport ◽  
Alexey Moshkovich ◽  
Vladislav Perfilyev ◽  
Igor Lapsker ◽  
Gregory Halperin ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Solid Lubricant ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Life ◽  
Lubricant Films ◽  
Mos2 Film ◽  
Steel Surfaces ◽  
Solid Lubricant Films

Incorporation of solid lubricant into micro-reservoirs produced by Laser Surface Texturing (LST) and its effect on the tribological properties of surfaces under dry friction is studied. The density of the dimple reservoirs and the height of the bulges around them are investigated in terms of the longevity of solid lubricant films burnished on LST steel surfaces. Friction tests were performed using a ball-on-flat device. Optimum density (40–50%) of the dimples is revealed. It is shown that the adhesion of solid lubricant in the space between the dimples is provided by mechanical engagement of particles in the rough surface and by smearing the solid lubricant around the dimples. Best results are obtained with the surfaces that were lapped to half of the height of bulges. Long wear life of burnished film on LST steel surfaces is apparently provided by preservation of thin MoS2 film around the bulges and by supply of solid lubricant from the dimples to the surface. The effect of repeated burnishing on wear life of solid lubricant films was studied. Repeating burnishing leading to increasing the density of solid lubricant films increases the wear life.

A Wear Equation for Bonded Solid Lubricant Films: Estimating Film Wear Life

1970 ◽  
Vol 92 (2) ◽  
pp. 274-279 ◽  
Author(s):  
E. F. Finkin
Keyword(s):  
Film Thickness ◽  
Contact Stress ◽  
Solid Lubricant ◽  
Normal Load ◽  
Wear Volume ◽  
Contact Conditions ◽  
Wear Life ◽  
Lubricant Films ◽  
Solid Lubricant Films ◽  
Low Contact Stress

A review of the literature establishes that the wear of bonded solid lubricant films for conditions of low average contact stress (say 10,000 psi and below), obeys an equation of the form V = KPL, where V is the wear volume, P is the normal load, L is the total sliding distance, and K is a constant. The limits on allowable bonded film thickness are examined, in the light of this equation, and it is shown that for low contact stress situations optimum film thickness is on the order of 10−3 in., rather than the popularly believed value of 10−4 in. This latter figure is the unfortunate consequence of applying data obtained at very high contact stress to contact conditions which are fundamentally different. Practical aspects of using this equation are explored by the development of specialized expressions which allow a design engineer or engineering analyst to estimate film wear life in terms of hours of operation or number of operating cycles. To aid in this purpose, wear coefficients for common solid lubricant-binder combinations are tabulated. A series of examples show how these expressions can be applied to typical situations. Equations are derived for the contact stress, area of contact, and average contact stress, for solid lubricant film covered surfaces under cylindrical or spherical contact. The use of these equations should replace the use of the Hertz contact equations in analyzing solid lubricated contact conditions.

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