Oxidation behaviour and its effect on fracture toughness of Niobium metal

Karthik Ramachandran; Yasith C. Jayakody; Doni Daniel Jayaseelan

doi:10.1016/j.ijrmhm.2022.106033

Oxidation behaviour and its effect on fracture toughness of Niobium metal

Karthik Ramachandran, Yasith C. Jayakody, Doni Daniel Jayaseelan

Kingston University

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Abstract

Niobium metal was studied for its oxidation behaviour at different temperatures (800, 1000 & 1200 °C) and time (1, 3 & 5 h). The study revealed that Nb underwent oxidation forming pro-active Nb oxides with initial formation of meta-stable Nb ₁₂O ₂₉ which forms as an oxidisation resistant layer. However, formation of Nb ₂O ₅ from a meta-sable Nb ₁₂O ₂₉ did not act as protective layer as it exposed underneath to further oxidation leading to cracks. The oxidation kinetics of Nb shown a linear behaviour and the devised mathematical model using Deal Grove determined the thickness of oxide layers. The un-protectiveness of Nb ₂O ₅ was verified by the Vickers hardness (8.06 ± 0.4 GPa) and indentation fracture toughness (28.14 ± 0.4 MPa.m ^1/2) of material which decreased with increase in oxidation temperature.

Original language	English
Article number	106033
Number of pages	7
Journal	International Journal of Refractory Metals and Hard Materials
Volume	110
Early online date	26 Oct 2022
DOIs	https://doi.org/10.1016/j.ijrmhm.2022.106033
Publication status	Published - Jan 2023
Externally published	Yes

Bibliographical note

Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/).

Keywords

Niobium
Oxidation behaviour
Oxidation kinetics
Indentation fracture toughness and scanning electron microscopy

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10.1016/j.ijrmhm.2022.106033Licence: CC BY-NC-ND

PublishedFinal published version, 5.04 MBLicence: CC BY-NC-ND
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title = "Oxidation behaviour and its effect on fracture toughness of Niobium metal",

abstract = "Niobium metal was studied for its oxidation behaviour at different temperatures (800, 1000 & 1200 °C) and time (1, 3 & 5 h). The study revealed that Nb underwent oxidation forming pro-active Nb oxides with initial formation of meta-stable Nb 12O 29 which forms as an oxidisation resistant layer. However, formation of Nb 2O 5 from a meta-sable Nb 12O 29 did not act as protective layer as it exposed underneath to further oxidation leading to cracks. The oxidation kinetics of Nb shown a linear behaviour and the devised mathematical model using Deal Grove determined the thickness of oxide layers. The un-protectiveness of Nb 2O 5 was verified by the Vickers hardness (8.06 ± 0.4 GPa) and indentation fracture toughness (28.14 ± 0.4 MPa.m 1/2) of material which decreased with increase in oxidation temperature.",

keywords = "Niobium, Oxidation behaviour, Oxidation kinetics, Indentation fracture toughness and scanning electron microscopy",

author = "Karthik Ramachandran and Jayakody, {Yasith C.} and Jayaseelan, {Doni Daniel}",

note = "Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/).",

year = "2023",

month = jan,

doi = "10.1016/j.ijrmhm.2022.106033",

language = "English",

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journal = "International Journal of Refractory Metals and Hard Materials",

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TY - JOUR

T1 - Oxidation behaviour and its effect on fracture toughness of Niobium metal

AU - Ramachandran, Karthik

AU - Jayakody, Yasith C.

AU - Jayaseelan, Doni Daniel

N1 - Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/).

PY - 2023/1

Y1 - 2023/1

N2 - Niobium metal was studied for its oxidation behaviour at different temperatures (800, 1000 & 1200 °C) and time (1, 3 & 5 h). The study revealed that Nb underwent oxidation forming pro-active Nb oxides with initial formation of meta-stable Nb 12O 29 which forms as an oxidisation resistant layer. However, formation of Nb 2O 5 from a meta-sable Nb 12O 29 did not act as protective layer as it exposed underneath to further oxidation leading to cracks. The oxidation kinetics of Nb shown a linear behaviour and the devised mathematical model using Deal Grove determined the thickness of oxide layers. The un-protectiveness of Nb 2O 5 was verified by the Vickers hardness (8.06 ± 0.4 GPa) and indentation fracture toughness (28.14 ± 0.4 MPa.m 1/2) of material which decreased with increase in oxidation temperature.

AB - Niobium metal was studied for its oxidation behaviour at different temperatures (800, 1000 & 1200 °C) and time (1, 3 & 5 h). The study revealed that Nb underwent oxidation forming pro-active Nb oxides with initial formation of meta-stable Nb 12O 29 which forms as an oxidisation resistant layer. However, formation of Nb 2O 5 from a meta-sable Nb 12O 29 did not act as protective layer as it exposed underneath to further oxidation leading to cracks. The oxidation kinetics of Nb shown a linear behaviour and the devised mathematical model using Deal Grove determined the thickness of oxide layers. The un-protectiveness of Nb 2O 5 was verified by the Vickers hardness (8.06 ± 0.4 GPa) and indentation fracture toughness (28.14 ± 0.4 MPa.m 1/2) of material which decreased with increase in oxidation temperature.

KW - Niobium

KW - Oxidation behaviour

KW - Oxidation kinetics

KW - Indentation fracture toughness and scanning electron microscopy

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U2 - 10.1016/j.ijrmhm.2022.106033

DO - 10.1016/j.ijrmhm.2022.106033

M3 - Article

SN - 0263-4368

VL - 110

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

M1 - 106033

ER -

Oxidation behaviour and its effect on fracture toughness of Niobium metal

Abstract

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Keywords

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