Title :
On the abrasivity of γ-Fe2O3and CrO2magnetic tapes
Author_Institution :
BASF AG, Ludwigshafen, Germany
fDate :
9/1/1974 12:00:00 AM
Abstract :
The abrasivity of CrO2and γ-Fe2O3particles has been compared in polishing experiments using typical head materials as test surfaces. In the hardness range of 1800 - 8000 N/mm2CrO2abrasivity decreases linearly with increasing hardness. Gamma ferric oxide behaves similarly up to 3000 N/mm2but its abrasivity drops off sharply at higher hardness values. This difference is interpreted in terms of particle hardness. Using heads with mumetal pole tips the abrasivity of CrO2and γ-Fe2O3audio tapes has been studied as a function of tape speed and humidity. In addition, a random selection of commercially available tapes has been evaluated. It has been found that on mumetal heads CrO2and γ-Fe2O3tapes are equally abrasive.
Keywords :
Chromium oxides; Iron oxides; Magnetic tape materials; Abrasives; Audio tapes; Coatings; Inorganic materials; Magnetic heads; Materials testing; Powders; Rough surfaces; Surface finishing; Surface roughness;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1974.1058494
