Friction Coefficients

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Tribology Wikipedia > Friction Coefficients

Friction Coefficients of Solid Lubricants, Metals and Antifriction Materials

Table of friction coefficients of various materials in atmosphere and vacuum (see the definition of friction coefficient). The data was collected from various sources [1,2].

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
Polytetrafluoroethylene – Polytetrafluoroethylene 0.04

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

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

 

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