Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K

Alloys for high temperature application always rely on their ability to form protective, dense Cr2O3 and Al2O3 scales. In case of Ni-Cr binary alloy, a minimum composition of Cr is required for the formation of continuous protective scale. However, addition of small amount of third element such a...

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Main Authors:	Ani, Mohd Hanafi, Herman, Sukreen Hana, -, Suryanto, Othman, Raihan
Format:	Article
Language:	English English
Published:	Trans Tech Publications, Switzerland 2012
Subjects:	TA Engineering (General). Civil engineering (General) TN Mining engineering. Metallurgy
Online Access:	http://irep.iium.edu.my/27472/ http://irep.iium.edu.my/27472/ http://irep.iium.edu.my/27472/ http://irep.iium.edu.my/27472/1/internal_oxidation_of_ni-cr-al_alloys_under_various_oxygen_partial_pressures_at_1273k.pdf http://irep.iium.edu.my/27472/4/27472_Internal%20Oxidation%20of%20Ni-Cr-Al%20Alloys%20under%20_SCOPUS.pdf

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spelling	iium-274722017-08-21T01:12:06Z http://irep.iium.edu.my/27472/ Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K Ani, Mohd Hanafi Herman, Sukreen Hana -, Suryanto Othman, Raihan TA Engineering (General). Civil engineering (General) TN Mining engineering. Metallurgy Alloys for high temperature application always rely on their ability to form protective, dense Cr2O3 and Al2O3 scales. In case of Ni-Cr binary alloy, a minimum composition of Cr is required for the formation of continuous protective scale. However, addition of small amount of third element such as Al may results in decrease of required Cr composition to form protective scale. This study aims to clarify the effect of ternary element on the formation of protective scale quantitatively. Ni-Cr alloys composed with 2 mass% and 4 mass% of Al were exposed in oxidizing environment under Cr/Cr2O3, Fe/FeO and Ni/NiO oxygen partial pressure. The oxidation of all samples is following parabolic rate’s law. XRD and SEM results show that Al2O3 and Cr2O3 are formed internally. Parabolic rate’s constant of samples oxidized in Ni/NiO oxygen partial pressure is higher by few magnitude orders. Higher Al concentration decreases the parabolic rate’s constant. It is concluded that the formation of protective scale is enhanced by the addition of Al as ternary element in Ni-Cr alloys. Trans Tech Publications, Switzerland 2012 Article PeerReviewed application/pdf en http://irep.iium.edu.my/27472/1/internal_oxidation_of_ni-cr-al_alloys_under_various_oxygen_partial_pressures_at_1273k.pdf application/pdf en http://irep.iium.edu.my/27472/4/27472_Internal%20Oxidation%20of%20Ni-Cr-Al%20Alloys%20under%20_SCOPUS.pdf Ani, Mohd Hanafi and Herman, Sukreen Hana and -, Suryanto and Othman, Raihan (2012) Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K. Advanced Materials Research, 576. pp. 429-433. ISSN 1022-6680 https://www.scientific.net/AMR.576.429 10.4028/www.scientific.net/AMR.576.429
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	TA Engineering (General). Civil engineering (General) TN Mining engineering. Metallurgy
spellingShingle	TA Engineering (General). Civil engineering (General) TN Mining engineering. Metallurgy Ani, Mohd Hanafi Herman, Sukreen Hana -, Suryanto Othman, Raihan Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K
description	Alloys for high temperature application always rely on their ability to form protective, dense Cr2O3 and Al2O3 scales. In case of Ni-Cr binary alloy, a minimum composition of Cr is required for the formation of continuous protective scale. However, addition of small amount of third element such as Al may results in decrease of required Cr composition to form protective scale. This study aims to clarify the effect of ternary element on the formation of protective scale quantitatively. Ni-Cr alloys composed with 2 mass% and 4 mass% of Al were exposed in oxidizing environment under Cr/Cr2O3, Fe/FeO and Ni/NiO oxygen partial pressure. The oxidation of all samples is following parabolic rate’s law. XRD and SEM results show that Al2O3 and Cr2O3 are formed internally. Parabolic rate’s constant of samples oxidized in Ni/NiO oxygen partial pressure is higher by few magnitude orders. Higher Al concentration decreases the parabolic rate’s constant. It is concluded that the formation of protective scale is enhanced by the addition of Al as ternary element in Ni-Cr alloys.
format	Article
author	Ani, Mohd Hanafi Herman, Sukreen Hana -, Suryanto Othman, Raihan
author_facet	Ani, Mohd Hanafi Herman, Sukreen Hana -, Suryanto Othman, Raihan
author_sort	Ani, Mohd Hanafi
title	Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K
title_short	Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K
title_full	Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K
title_fullStr	Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K
title_full_unstemmed	Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K
title_sort	internal oxidation of ni-cr-al alloys under various oxygen partial pressures at 1273 k
publisher	Trans Tech Publications, Switzerland
publishDate	2012
url	http://irep.iium.edu.my/27472/ http://irep.iium.edu.my/27472/ http://irep.iium.edu.my/27472/ http://irep.iium.edu.my/27472/1/internal_oxidation_of_ni-cr-al_alloys_under_various_oxygen_partial_pressures_at_1273k.pdf http://irep.iium.edu.my/27472/4/27472_Internal%20Oxidation%20of%20Ni-Cr-Al%20Alloys%20under%20_SCOPUS.pdf
first_indexed	2023-09-18T20:40:49Z
last_indexed	2023-09-18T20:40:49Z
_version_	1777409353000681472

Internal oxidation of Ni-Cr-Al alloys under various oxygen partial pressures at 1273 K

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