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Effect of Inert, Reducing, and Oxidizing Atmospheres on Friction and Wear of Metals to 1000 FExperiments were conducted in inert, reducing, and oxidizing atmospheres to determine their influence on the friction and wear properties of various metals. Nitrogen, argon, forming gas (10 volume percent H2, 90 volume percent N2), and various concentrations of oxygen in nitrogen were used. A 3/16-inch-radius hemispherical rider under a load of 1000 grams contacted the flat surface of a rotating disk. The surface speed employed was 35 feet per minute. The presence of surface oxides is vitally important to the protection of metals in sliding contact. Extremely high friction and excessive wear were encountered in the absence of these oxides. In some instances (electrolytically pure copper), the removal of the surface oxides resulted in mass welding of the specimens in sliding contact. Extremely small quantities of oxygen are sufficient to provide protection of metal surfaces; for example, with 440-C stainless steel, 0.03 volume percent oxygen was found to be adequate.
Document ID
19980228063
Acquisition Source
Headquarters
Document Type
Other - NASA Technical Note (TN)
Authors
Buckley, Donald H. (NASA Lewis Research Center Cleveland, OH United States)
Johnson, Robert L. (NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1961
Subject Category
Metallic Materials
Report/Patent Number
NASA-TN-D-1103
E-1343
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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