Author： Franklin P. Davies B. L.
Publisher： Maney Publishing
ISSN： 1743-2901
Source： Powder Metallurgy, Vol.20, Iss.1, 1977-01, pp. : 11-16
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Abstract
Low-density sintered iron specimens were steam-oxidized in an experimental furnace. It was found that initially the porosity determined by oil impregnation decreased uniformly with the amount of oxide produced, but that within a small time interval the measured porosity suddenly dropped to a low value. It is demonstrated that this decrease is due to complete sealing of all surface passages into the interconnected pore network, and that a substantial interconnected pore network still exists beneath the specimen surface. Comments are made on the kinetics of steam oxidation and on the constitution of the specimens at each stage of the oxidation process. It is shown that treatment at 650°C produces very rapid oxidation but, owing to surface sealing, a lower oxide content is achieved after long treatment times than would be achieved at normal treatment temperatures.
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