Author： Peraldi R. Monceau D. Pieraggi B.
Publisher： Springer Publishing Company
ISSN： 0030-770X
Source： Oxidation of Metals, Vol.58, Iss.3-4, 2002-10, pp. : 249-273
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Abstract
The morphology and microstructure of NiO scales grown during oxidation of high-purity nickel were investigated. The oxidation tests performed between 450 and 1200°C in pure oxygen at atmospheric pressure were stopped at given scale thicknesses ranging from 1 to 70 μm. The specific specimen preparation and test procedure used in this work led to very good test reproducibility. The morphological and microstructural evolution of NiO scales are described by temperature-thickness maps. The scale morphology can be faceted or cellular. In addition, the growth of NiO platelets was observed in a specific temperature-thickness range. The microstructure of oxide scales can be simplex compact, simplex porous, or duplex. An important effect of substrate orientation was also observed, independent of the test temperature and scale thickness.
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