Paper Titles
Advanced Coatings on High Temperature Applications
p.1
Metal Dusting Reaction Mechanisms
p.15
High Temperature Passive Oxidation Mechanism of CVD SiC
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Void Formation in Magnetite Scale Formed on Iron at 823 K -Elucidation by Chemical Potential Distribution-
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Transition from External to Internal Oxidation of Single Phase Binary Alloys
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Behaviour of Copper and Nickel during High Temperature Oxidation of Steel Containing Them
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Modern Analytical Techniques in High Temperature Oxidation and Corrosion
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In Situ Study of Real Structure Effects on the Initial Oxidation of FeCrAl Alloys by Two-Dimensional High Temperature X-Ray Diffraction
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Oxidation of a Low Carbon, Low Silicon Steel in Air at 600-920°C
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Metal Dusting Reaction Mechanisms

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Abstract:

Iron and nickel, model alloys of Ni-Cu and Fe-Cr, and commercial heat resisting alloys were exposed at 650-680oC to flowing CO-H2-H2O gases which were supersaturated with respect to carbon. All ferritic materials, including chromia and alumina formers, developed a coke deposit of carbon nanotubes, the growth of which was catalysed by nanoparticles of Fe3C. Austenitic materials formed graphite filaments and clusters in association with nanoparticles of austenite. Graphite cluster formation was suppressed by alloying copper with nickel. The sensitivity of coking kinetics to alloy copper content was consistent with a mechanism involving graphite nucleation within the subsurface metal. Chromia forming alloys resisted dusting until damage to the scale could no longer be repaired by Cr2O3 regrowth, and carbon gained access to chromium – depleted metal.

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Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

15-26

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.15

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Online since:

August 2006

Authors:

David J. Young

Keywords:

Carbon Nanotube (CN), Carburization, Catalysis, Cementite, Coking, Thermal Cycling

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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