Oxidation behavior of Nb-Si-B alloys with the NbSi2 coating layer formed by a pack cementation technique

Jingchang Cheng; Seonghoon Yi; Joon Sik Park

doi:10.1016/j.ijrmhm.2013.02.010

Oxidation behavior of Nb-Si-B alloys with the NbSi₂ coating layer formed by a pack cementation technique

Jingchang Cheng, Seonghoon Yi, Joon Sik Park

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Abstract

The oxidation behavior of Nb-Si-B alloys with NbSi₂ coating layers was investigated at 1100 C under ambient atmosphere. Continuous NbSi ₂ layers with a thickness of 40-60 μm were coated by depositing Si on the alloy surfaces at 900 C using a pack cementation technique. A sharp interface was observed between the NbSi₂ layer and the pure Nb, while a (Nb₅Si₃ + T2) two-phase region formed between the NbSi₂ layer and the alloy with the T2 phase composition. During oxidation, a glassy SiO₂ layer formed significantly increasing the oxidation resistance of the coated alloys. However, evaporation of B occurred forming a porous SiO₂ layer during the oxidation of the alloys with high B content. The oxidation behavior of the coated pure Nb and T2 phase alloys is discussed based on a microstructural analysis of the oxidized samples.

Original language	English
Pages (from-to)	103-109
Number of pages	7
Journal	International Journal of Refractory Metals and Hard Materials
Volume	41
DOIs	https://doi.org/10.1016/j.ijrmhm.2013.02.010
State	Published - Nov 2013

Keywords

High temperature alloy
Nb alloy
Oxidation
Pack cementation
T2 phase

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10.1016/j.ijrmhm.2013.02.010

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title = "Oxidation behavior of Nb-Si-B alloys with the NbSi2 coating layer formed by a pack cementation technique",

abstract = "The oxidation behavior of Nb-Si-B alloys with NbSi2 coating layers was investigated at 1100 C under ambient atmosphere. Continuous NbSi 2 layers with a thickness of 40-60 μm were coated by depositing Si on the alloy surfaces at 900 C using a pack cementation technique. A sharp interface was observed between the NbSi2 layer and the pure Nb, while a (Nb5Si3 + T2) two-phase region formed between the NbSi2 layer and the alloy with the T2 phase composition. During oxidation, a glassy SiO2 layer formed significantly increasing the oxidation resistance of the coated alloys. However, evaporation of B occurred forming a porous SiO2 layer during the oxidation of the alloys with high B content. The oxidation behavior of the coated pure Nb and T2 phase alloys is discussed based on a microstructural analysis of the oxidized samples.",

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T1 - Oxidation behavior of Nb-Si-B alloys with the NbSi2 coating layer formed by a pack cementation technique

AU - Cheng, Jingchang

AU - Yi, Seonghoon

AU - Park, Joon Sik

PY - 2013/11

Y1 - 2013/11

N2 - The oxidation behavior of Nb-Si-B alloys with NbSi2 coating layers was investigated at 1100 C under ambient atmosphere. Continuous NbSi 2 layers with a thickness of 40-60 μm were coated by depositing Si on the alloy surfaces at 900 C using a pack cementation technique. A sharp interface was observed between the NbSi2 layer and the pure Nb, while a (Nb5Si3 + T2) two-phase region formed between the NbSi2 layer and the alloy with the T2 phase composition. During oxidation, a glassy SiO2 layer formed significantly increasing the oxidation resistance of the coated alloys. However, evaporation of B occurred forming a porous SiO2 layer during the oxidation of the alloys with high B content. The oxidation behavior of the coated pure Nb and T2 phase alloys is discussed based on a microstructural analysis of the oxidized samples.

AB - The oxidation behavior of Nb-Si-B alloys with NbSi2 coating layers was investigated at 1100 C under ambient atmosphere. Continuous NbSi 2 layers with a thickness of 40-60 μm were coated by depositing Si on the alloy surfaces at 900 C using a pack cementation technique. A sharp interface was observed between the NbSi2 layer and the pure Nb, while a (Nb5Si3 + T2) two-phase region formed between the NbSi2 layer and the alloy with the T2 phase composition. During oxidation, a glassy SiO2 layer formed significantly increasing the oxidation resistance of the coated alloys. However, evaporation of B occurred forming a porous SiO2 layer during the oxidation of the alloys with high B content. The oxidation behavior of the coated pure Nb and T2 phase alloys is discussed based on a microstructural analysis of the oxidized samples.

KW - High temperature alloy

KW - Nb alloy

KW - Oxidation

KW - Pack cementation

KW - T2 phase

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VL - 41

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JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

ER -

Oxidation behavior of Nb-Si-B alloys with the NbSi₂ coating layer formed by a pack cementation technique

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