Friction Coefficient Tables in Air and Vacuum

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Tribology Wikipedia > Friction Coefficient Tables in Air and Vacuum

Friction coefficient tables for solid lubricants, metals, plastics and anti-friction materials

Friction coefficient tables for various material pairs in atmosphere and vacuum (see the definition of friction coefficient) are provided below. The data was collected from various sources [1,2,3].

Material Combination Friction coefficient in air Friction coefficient in vacuum
Fe-Fe 0.3 1.9
Fe-Mg 1 0.6
Fe-Cd 1.5 0.4
Fe-Pb 0.9 0.4
Stainless Steel -Stainless Steel 0.5 2.9
Stainless Steel – Cu 0.3
Stainless Steel-Al 0.4 0.3
Stainless Steel-Mo 0.8
Stainless Steel-Ni 0.8
Stainless Steel-Teflon 0.2
Stainless Steel-Si 0.2
Stainless Steel-Ge 0.2
Stainless Steel-Glass 0.5
Chromium Steel – Chromium Steel 0.5 0.5
Cu-Cu 0.5-1.0 4.8-21.0
Cu-Ni 0.6 1.5-2.0
Al-Al 0.8 1.6-2.2
Al-Ni 2.4
Al-Cu 1.5
Al-Ag 2.2
Brass-Brass 0.4 0.7
Ni-Ni 4.9
Ag-Ag 3.9
Cr-Cr 0.6 3
Au-Au 0.6 4.5
Zn-Zn 1 3
Zr-Zr 1.5
Chromium Steel – MoS2 (vacuum deposition) 0.06
Chromium Steel – MoS2 (friction deposition) 0.06
Cu-MoS2 0.2 0.07
Brass-Steel 0.35
Tire – Asphalt 0.72
Tire – Grass 0.35
Diamond – Diamond 0.1
Glass – Glass 0.9-1.0
Graphite – Steel 0.1
Graphite – Graphite 0.1 0.5-0.8
Ice – Ice 0.02-0.09
Ice – Steel 0.03
Wood – Wood >0.2
Polytetrafluoroethylene – Polytetrafluoroethylene 0.04

Steel friction coefficient table

Friction Coefficient of Wood, Leather, and Stone

Sliding Friction Coefficient Table for Selected Ceramic Materials (Room Temperature in Air)

Ice friction coefficient

Depending on pressure, temperature, and the conditions of formation, ice can take on any of at least eight allotropic forms, the largest number for any known substance. These changes impact the ice friction coefficient behavior, as shown in the figure below.

ice friction coefficient
Friction coefficient for stainless steel and ice on polycrystalline ice as a function
of temperature, [3].

Friction coefficient table for materials in fretting regime

In fretting, friction coefficients are different for the same pairs of materials due to changes in friction mechanisms. These tables include some data for commonly used materials.

Friction coefficient table in fretting regime as a function of humidity

References

  1. [1]. Mechanics and Physics of Precise Vacuum Mechanisms, E.A. Deulin, V.P. Mikhailov, Yu.V. Panfilov, R.A. Nevshupa.

  2. [2]. http://www.engineeringtoolbox.com/friction-coefficients-d_778.html.

  3. [3]. Friction Science and Technology: From Concepts to Applications, Peter J. Blau, 2005

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