On the high-temperature oxidation of Cu-rich Cu-Ni alloys

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Oxidation of Metals

DOI:https://doi.org/10.1023/A:1018884120304· OSTI ID:651051

Haugsrud, R; Kofstad, P ^[1]

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1. Univ. of Oslo (Norway). Center for Materials Science

Cu-2 wt.%Ni and Cu-5wt.%Ni were oxidized at 800 to 1,050 C and oxygen pressures from 5 {times} 10{sup {minus}4} to 1 atm. The oxidation, as measured by thermogravimetry, was approximately parabolic. The oxide scales could be divided in two main regions: An outer region consisting of copper oxides and an inner porous region, which consists of Cu{sub 2}O with dispersed NiO particles. NiO particles exists as internal-oxide particles. The interface between the two layers reflects the original surface, which shows that the outer part grows by outward Cu diffusion via vacancies. The inner part grows by outward diffusion of copper and inward transport of gaseous oxygen by the dissociative-transport mechanism. The amount of porosity, the relative thickness of the inner layer compared to the total thickness of the scale, and the oxidation rate as a function of Ni content was dependent on the reaction conditions.

• OSTI ID: 651051
• Journal Information: Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 3-4 Vol. 50; ISSN OXMEAF; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER ALLOYS
DIFFUSION
EXPERIMENTAL DATA
NICKEL ALLOYS
OXIDATION
PRESSURE DEPENDENCE
SCALING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 1000-4000 K
WEIGHT