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Humidity effects on adhesion of nickel-zinc ferrite in elastic contact with magnetic tape and itselfThe effects of humidity on the adhesion of Ni-Zn ferrite and magnetic tape in elastic contact with a Ni-Zn ferrite hemispherical pin in moist nitrogen were studied. Adhesion was independent of normal load in dry, humid, and saturated nitrogen. Ferrites adhere to ferrites in a saturated atmosphere primarily from the surface tension effects of a thin film of water adsorbed on the ferrite surfaces. The surface tension of the water film calculated from the adhesion results was 48 times 0.00001 to 56 times 0.00001 N/cm; the accepted value for water is 72.7 x 0.00001 N/cm. The adhesion of ferrite-ferrite contacts increased gradually with increases in relative humidity to 80 percent, but rose rapidly above 80 percent. The adhesion at saturation was 30 times or more greater than that below 80 percent relative humidity. Although the adhesion of magnetic tape - ferrite contacts remained low below 40 percent relative humidity and the effect of humidity was small, the adhesion increased considerably with increasing relative humidity above 40 percent. The changes in adhesion of elastic contacts were reversible on humidifying and dehumidifying.
Document ID
19850013049
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Miyoshi, K. (NASA Lewis Research Center Cleveland, OH, United States)
Buckley, D. H. (NASA Lewis Research Center Cleveland, OH, United States)
Kusaka, T. (Osaka Inst. of Technology)
Maeda, C. (Osaka Inst. of Technology)
Date Acquired
September 5, 2013
Publication Date
March 1, 1985
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.60:2449
E-2361
NASA-TP-2449
Accession Number
85N21359
Funding Number(s)
PROJECT: RTOP 506-53-1B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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