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Surface chemistry, friction, and wear of Ni-Zn and Mn-Zn ferrites in contact with metalsX-ray photoelectron and Auger electron spectroscopy analysis were used in sliding friction experiments. These experiments were conducted with hot-pressed polycrystalline Ni-Zn and Mn-Zn ferrites, and single-crystal Mn-Zn ferrite in contact with various transition metals at room temperature in both vacuum and argon. The results indicate that Ni2O3 and Fe3O4 were present on the Ni-Zn ferrite surface in addition to the nominal bulk constituents, while MnO2 and Fe3O4 were present on the Mn-Zn ferrite surface in addition to the nominal bulk constituents. The coefficients of friction for the ferrites in contact with metals were related to the relative chemical activity of these metals. The more active the metal, the higher is the coefficient of friction. The coefficients of friction for the ferrites were correlated 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 does strengthen the metal-ferrite contact and increase the friction. The ferrites exhibit local cracking and fracture with sliding under adhesive conditions. All the metals transferred to the surfaces of the ferrites in sliding. Previously announced in STAR as N83-19901
Document ID
19840030729
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Miyoshi, K.
(NASA Lewis Research Center Cleveland, OH, United States)
Buckley, D. H.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1983
Publication Information
Publication: Ceramic Engineering and Science Proceedings
Volume: 4
ISSN: 0196-6219
Subject Category
Nonmetallic Materials
Accession Number
84A13516
Distribution Limits
Public
Copyright
Other

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