The Transition from Internal to External Oxidation of Ni - X Wt.% Cr at 950°C

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The papers focus is to establish the criterion for the transition from internal to external oxidation. This criterion is a simple value of oxide volume fraction where the coalescence of the nodular oxide in the continuous layer is considered as inevitable. It is obtained by the Wagners analytical solution and by the data of Giggins et al. [1], which give the experimental transition from internal to external oxidation between 10 and 11 weight percent of chromium in the initial alloy. This paper also enables to obtain the oxygen diffusion coefficient in pure nickel thanks to the experimental results of oxidation at 950 °C during 10 hours on Ni-0.2Cr, Ni-1Cr and Ni-5Cr model alloys.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 323-325)

Edited by:

I. Bezverkhyy, S. Chevalier and O. Politano

Pages:

295-300

DOI:

10.4028/www.scientific.net/DDF.323-325.295

Citation:

A. Nicolas et al., "The Transition from Internal to External Oxidation of Ni - X Wt.% Cr at 950°C", Defect and Diffusion Forum, Vols. 323-325, pp. 295-300, 2012

Online since:

April 2012

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$38.00

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