Oxidation of Fe‐29Ni‐17Co Alloy

Piscitelli, Rosangela; Rhee, Sang-In; Bradley, F. N.

doi:10.1149/1.2132970

Cited by 11 publications

(3 citation statements)

References 2 publications

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“…10. This is in agreement with the existing literature [6,10,18,19]. If the Kovar is to be used in a glass-to-metal seal, then the porosity may allow the molten glass to penetrate the metal leading to increased mechanical keying, improving the bond strength.…”

Section: Resultssupporting

confidence: 91%

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

Yates

Mallinson

et al. 2017

Oxid Met

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This work provides new insight and evidence that challenges and extends the accepted view of the oxidation behaviour of Kovar (ASTM-15). Specimens of 2 mm diameter Kovar wire were oxidised in air at 700 or 800°C for 10 min. The resulting oxide layers were analysed by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, scanning transmission electron microscopy and Raman spectroscopy. Oxide layers of approximately 2 and 4 lm thickness were formed at 700 and 800°C, respectively. These were found to contain iron, cobalt and traces of nickel. The combination of analysis techniques revealed that the oxide contains Fe 2 O 3 in addition to (Fe, Co, Ni) 3 O 4 , a spinel oxide, in contrast to the combinations of Fe 3 O 4 , Fe 2 O 3 and FeO that are typically reported. The oxide layer was found to be complex, consisting of multiple layers with different compositions, which is overlooked in the existing literature.Keywords Raman spectroscopy Á Spinels Á X-ray photoelectron spectroscopy (XPS) Á Scanning electron microscopy (SEM) Á Glass-to-metal seal

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Section: Resultssupporting

confidence: 91%

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

Yates

Mallinson

et al. 2017

Oxid Met

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“…Anodes having nickel contents of ≥75 wt-% have been shown to undergo surface fluoridation after only a few minutes operation. 7,17 NiF 2 films have high electrical resistance and invariably cause passivity and failure of the anode.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface oxidation on corrosion mechanism of Co–20·8Ni–6Al–10Cu–11Fe cobalt alloy in molten cryolite

Tamasgavabari

Jafarzadeh

Madanipoor³

et al. 2014

Corrosion Engineering, Science and Technology

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In this paper, the effect of surface oxidation on corrosion behaviour of Co-20?8Ni-6Al-10Cu-11Fe alloy in molten cryolite is investigated. The samples were produced by casting and then were oxidised at 1000uC for 10, 30 and 70 h respectively. The oxide layers were studied by scanning electron microscope (SEM) and X-ray diffraction (XRD). To determine the corrosion behaviour of the oxidised samples, they were exposed to molten cryolite at 930uC for 20 h. After corrosion, the samples were studied by SEM. The results showed that all the samples corroded, but the sample oxidised for 70 h, was more stable than the other and the other one that oxidised for 10 h, corroded severely.

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“…Dentre eles pode-se citar: atmosfera oxidante, composição química da liga metálica, temperatura, pressão e condição de superfície do metal oxidado. [48][49][50][51][52] 2.5.1.…”

Section: Corrosãounclassified

Caracterização Da Camada Oxidada Obtida Em Diferentes Condições De Superfície Da Liga Astm F15

SOUTO¹

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Primeiramente à Deus que permitiu que esta oportunidade pudesse ocorrer em minha vida.À minha família, um alicerce emocional de valor inestimável, que de forma descontraída e compreensiva me apoiou em todos os momentos.Aos meus pais e irmãos, que sempre me estimularam ao aperfeiçoamento humano e profissional sem esquecer o verdadeiro significado da vida.Ao Exército Brasileiro por permitir a realização deste curso.À Capes por trabalhar em prol do estudante.À PUC-Rio por servir de berço de excelência para o aperfeiçoamento humano.À minha orientadora, professora Ivani de S. Bott, que com muita paciência, equilíbrio e capacidade técnica, acreditou e tornou mais transparente os desafios deste trabalho.Ao Ten Cel Bortolini do CTEx, por me proporcionar apoio técnico e estrutural inestimado para a realização deste trabalho. The alloy ASTM F15 is used for the encapsulation of components or electronic devices because of its low coefficient of thermal expansion that is similar to hard glasses. In construction joints glass-to-metal tightness with characteristics forming an oxide layer on the metallic surface is required so that adequate wetting takes place at the surface of this sealing glass. This study looked at two types of surfaces, subdivided into groups in order to assess their influence on the oxide layer.One group was subjected to mechanical polishing and the other group subjected to chemical polishing. The surfaces were oxidized at a temperature of 800 ° C in the ambient atmosphere by varying the oxidation time at 5, 10, 20 and 40 minutes, followed by cooling to air. As oxide layers were characterized for their morphology and chemical composition, using Scanning Electron Microscopy (SEM), Optic Microscopy, X-Ray Diffraction (XRD) and Emission spectroscopy and X-ray photons (XPS) and Rugosimeter.The oxide layer was evaluated in terms of surface mass, thickness, chemical composition and surface roughness of the metal surface.The main oxidation products under the conditions studied were Hematite (Fe 2 O 3 ), Magnetite (Fe 3 O 4 ) and Taenita (FeNi). It was observed that, surface roughness conditions did not influence the type of oxidation products obtained, but it had greater mass gains for the mechanically polished surfaces.

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Oxidation of Fe‐29Ni‐17Co Alloy

Cited by 11 publications

References 2 publications

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

An Investigation into the Nature of the Oxide Layer Formed on Kovar (Fe–29Ni–17Co) Wires Following Oxidation in Air at 700 and 800 °C

Effect of surface oxidation on corrosion mechanism of Co–20·8Ni–6Al–10Cu–11Fe cobalt alloy in molten cryolite

Caracterização Da Camada Oxidada Obtida Em Diferentes Condições De Superfície Da Liga Astm F15

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