Degradation of passivated iron particles in humid atmospheres

Author

Jung, Ching-Shan ; Bond, Gary ; Raghavan, Srini ; Emrick, Roy

Author_Institution

Dept. of Mater. Sci. & Eng., Arizona Univ., Tucson, AZ, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4065

Lastpage

4067

Abstract

The interaction of water vapor with passivated iron particles used in magnetic recording was studied under different temperature and humidity conditions using a flow microcalorimetric (FMC) technique. Water uptake by passivated iron particles increased linearly with relative humidity ranging from 30% to 70% RH in the temperature range 30°C to 70°C. Mossbauer measurements showed that the ratio of core iron to oxide iron decreased during aging. Particles coated with hydrophobic WC exhibited much less water uptake than particles coated with a less hydrophobic polymer, poly(vinyl alcohol)

Keywords

Mossbauer spectroscopy; ageing; calorimetry; environmental testing; iron; magnetic particles; magnetic recording; magnetic tapes; Mossbauer measurements; aging; flow microcalorimetric technique; humid atmospheres; humidity conditions; hydrophobic WC; magnetic recording; magnetic tapes; passivated iron particles; temperature conditions; water vapor; Aging; Atmosphere; Degradation; Humidity; Iron; Magnetic cores; Magnetic recording; Optical wavelength conversion; Polymer films; Temperature distribution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.333990

Filename

333990