Chemical state of segregants at Al sub 2 O sub 3 /alloy interfaces studied using mu XPS

The adherence of an oxide layer that forms on alloy surfaces as a result of high temperature oxidation often depends on the composition and structure of the oxide/alloy interface. This work follows previous Auger studies on two Al sub 2 O sub 3 /alloy interfaces after removal of the external alumna...

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Bibliographic Details
Published in:Applied surface science 2001-07, Vol.178 (1-4), p.156-164
Main Authors: Hou, P Y, Ackerman, G D
Format: Article
Language:English
Online Access:Get full text
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Summary:The adherence of an oxide layer that forms on alloy surfaces as a result of high temperature oxidation often depends on the composition and structure of the oxide/alloy interface. This work follows previous Auger studies on two Al sub 2 O sub 3 /alloy interfaces after removal of the external alumna layer in vacuum. An attempt was made to use micro X-ray photoelectron spectroscopy to examine the chemical state of impurities and solutes that segregated to the interface during oxidation and cooling. Both alloys were iron-based: FeCrAl and FeAl. It was found that on the FeCrAl, S was saturated along with Cr and C co-segregation, forming a multi-layer structure with enriched chromium sulfide at the oxide side and chromium carbide at the alloy side. On the FeAl, segregated sulfur only partially covered the interface, but was also present as a sulfide. The different interfacial chemistry between these two systems demonstrated the complexity that can exist under the dynamic oxidation conditions.
ISSN:0169-4332