NASA Technical Reports Server (NTRS) : X pdf

NASA Technical Reports Server (NTRS) : X

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X-ray photoelectron spectroscopy analysis and sliding friction experiments were conducted with hot-pressed, polycrystalline Ni-Zn and Mn-Zn ferrites in sliding contact with various transition metals at room temperature in a vacuum of 30 nPa. The results indicate that the coefficients of friction for Ni-Zn and Mn-Zn ferrites in contact with metals are related to the relative chemical activity in these metals: the more active the metal, the higher is the coefficient of friction. The coefficients of friction for the ferrites correlate with the free energy of formation of the lowest metal oxide. The interfacial bond can be regarded as a chemical bond between the metal atoms and the oxygen anions in the ferrite surfaces. The adsorption of oxygen on clean metal and ferrite surfaces increases the coefficients of friction for the Ni-Zn and Mn-Zn ferrite-metal interfaces

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 4/1/1983
• Year: 1983
• Book Topics/Themes: NASA Technical Reports Server (NTRS), FERRITES, FRICTION, MANGANESE, NICKEL, SLIDING FRICTION, SPECTROSCOPIC ANALYSIS, ZINC, COEFFICIENT OF FRICTION, ELECTRON SPECTROSCOPY, IRON COMPOUNDS, TRANSITION METALS, Miyoshi, K., Buckley, D. H

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