NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Sulfur at nickel-alumina interfaces - Molecular orbital theoryPrevious studies on Al-Ni alloys containing sulfur as an impurity suggest that, when S is in the interface between a metal and an oxide scale, it weakens the chemical bonding between them. This paper investigates factors responsible for this effect, using a molecular orbital theory to predict sulfur structures and electronic properties on the Ni-Al2O3 interface. It is shown that, in absence of S, the basal plane of Al2O3 will bind strongly through the Al(3+) cation surface to Ni (111). When segregated S impurity is present on the Ni surface, there are too few interfacial AlS bonds to effect good adhesion, leading to an inhibition of the oxide scale adhesion in NiCrAl alloys.
Document ID
19910028302
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hong, S. Y.
(Case Western Reserve Univ. Cleveland, OH, United States)
Anderson, Alfred B.
(Case Western Reserve University Cleveland, OH, United States)
Smialek, James L.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Surface Science
Volume: 230
ISSN: 0039-6028
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
E-5766
Accession Number
91A12925
Funding Number(s)
CONTRACT_GRANT: NAG3-688
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available