Friction Coefficients

Leonardo-da-Vinci-Friction-Coefficient
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Friction Coefficients
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<h1>Friction Coefficients of Solid Lubricants, Metals and Antifriction Materials</h1> Table of friction coefficients of various materials in atmosphere and vacuum (see the definition of <a href="http://www.tribonet.org/wiki/coefficient-of-friction/" target="_blank">friction coefficient</a>). The data was collected from various sources [1,2]. <table width="541"> <tbody> <tr> <td style="text-align: center;" width="207">Material Combination</td> <td style="text-align: center;" width="151">Friction coefficient in air</td> <td style="text-align: center;" width="183">Friction coefficient in vacuum</td> </tr> <tr> <td style="text-align: center;">Fe-Fe</td> <td style="text-align: center;">0.3</td> <td style="text-align: center;">1.9</td> </tr> <tr> <td>Fe-Mg</td> <td>1</td> <td>0.6</td> </tr> <tr> <td>Fe-Cd</td> <td>1.5</td> <td>0.4</td> </tr> <tr> <td>Fe-Pb</td> <td>0.9</td> <td>0.4</td> </tr> <tr> <td>Stainless Steel -Stainless Steel</td> <td>0.5</td> <td>2.9</td> </tr> <tr> <td>Stainless Steel - Cu</td> <td>-</td> <td>0.3</td> </tr> <tr> <td>Stainless Steel-Al</td> <td>0.4</td> <td>0.3</td> </tr> <tr> <td>Stainless Steel-Mo</td> <td>-</td> <td>0.8</td> </tr> <tr> <td>Stainless Steel-Ni</td> <td>-</td> <td>0.8</td> </tr> <tr> <td>Stainless Steel-Teflon</td> <td>-</td> <td>0.2</td> </tr> <tr> <td>Stainless Steel-Si</td> <td>-</td> <td>0.2</td> </tr> <tr> <td>Stainless Steel-Ge</td> <td>-</td> <td>0.2</td> </tr> <tr> <td>Stainless Steel-Glass</td> <td>-</td> <td>0.5</td> </tr> <tr> <td>Chromium Steel - Chromium Steel</td> <td>0.5</td> <td>0.5</td> </tr> <tr> <td>Cu-Cu</td> <td>0.5-1.0</td> <td>4.8-21.0</td> </tr> <tr> <td>Cu-Ni</td> <td>0.6</td> <td>1.5-2.0</td> </tr> <tr> <td>Al-Al</td> <td>0.8</td> <td>1.6-2.2</td> </tr> <tr> <td>Al-Ni</td> <td>-</td> <td>2.4</td> </tr> <tr> <td>Al-Cu</td> <td>-</td> <td>1.5</td> </tr> <tr> <td>Al-Ag</td> <td>-</td> <td>2.2</td> </tr> <tr> <td>Brass-Brass</td> <td>0.4</td> <td>0.7</td> </tr> <tr> <td>Ni-Ni</td> <td>-</td> <td>4.9</td> </tr> <tr> <td>Ag-Ag</td> <td>-</td> <td>3.9</td> </tr> <tr> <td>Cr-Cr</td> <td>0.6</td> <td>3</td> </tr> <tr> <td>Au-Au</td> <td>0.6</td> <td>4.5</td> </tr> <tr> <td>Zn-Zn</td> <td>1</td> <td>3</td> </tr> <tr> <td>Zr-Zr</td> <td>-</td> <td>1.5</td> </tr> <tr> <td>Chromium Steel - MoS2 (vacuum deposition)</td> <td>-</td> <td>0.06</td> </tr> <tr> <td>Chromium Steel - MoS2 (friction deposition)</td> <td>-</td> <td>0.06</td> </tr> <tr> <td>Cu-MoS2</td> <td>0.2</td> <td>0.07</td> </tr> <tr> <td>Brass-Steel</td> <td>0.35</td> <td>-</td> </tr> <tr> <td>Tire - Asphalt</td> <td>0.72</td> <td>-</td> </tr> <tr> <td>Tire - Grass</td> <td>0.35</td> <td>-</td> </tr> <tr> <td>Diamond - Diamond</td> <td>0.1</td> <td>-</td> </tr> <tr> <td>Glass - Glass</td> <td>0.9-1.0</td> <td>-</td> </tr> <tr> <td>Graphite - Steel</td> <td>0.1</td> <td>-</td> </tr> <tr> <td>Graphite - Graphite</td> <td>0.1</td> <td>0.5-0.8</td> </tr> <tr> <td>Ice - Ice</td> <td>0.02-0.09</td> <td>-</td> </tr> <tr> <td>Ice - Steel</td> <td>0.03</td> <td>-</td> </tr> <tr> <td>Polytetrafluoroethylene - Polytetrafluoroethylene</td> <td>0.04</td> <td>-</td> </tr> </tbody> </table> [1]. Mechanics and Physics of Precise Vacuum Mechanisms, E.A. Deulin, V.P. Mikhailov, Yu.V. Panfilov, R.A. Nevshupa. [2]. <a href="http://www.engineeringtoolbox.com/friction-coefficients-d_778.html" target="_blank">http://www.engineeringtoolbox.com/friction-coefficients-d_778.html</a>. &nbsp;
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