Friction and Morphology of Magnetic Tapes in Sliding Contact with Nickel-Zinc Ferrite.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
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Friction and morphological studies were conducted with magnetic tapes contacting a Ni-Zn ferrite hemispherical pin in laboratory air at a relative humidity of 40 percent and at 23 C. The results indicate that the binder plays a significant role in the friction properties, morphology, and microstructure of the tape. Comparisons were made with four binders nitrocellulose polyvinyledene chloride cellulose acetate and hydroxyl-terminated, low-molecular-weight polyester added to the base polymer, polyester polyurethane. The coefficient of friction was lowest for the tape with the nitrocellulose binder and increased in the order hydroxyl-terminated, low-molecular-weight polyester resin poly vinyledene chloride and cellulose acetate. The degree of enclosure of the oxide particles by the binder was highest for hydroxyl-terminated, low-molecular-weight polyester and decreased in the order cellulose acetate, poly vinyledene chloride, and nitrocellulose. The nature of deformation of the tape was a factor in controlling friction. The coefficient of friction under elastic contact conditions was considerably lower than under conditions that produced plastic contacts.
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