Development of silicide coatings over Nb-NbCr2 alloy and their oxidation behavior at 1250°C

Yanqiang Qiao; Maoyuan Li; Xiping Guo

doi:10.1016/j.surfcoat.2014.07.058

Development of silicide coatings over Nb-NbCr₂ alloy and their oxidation behavior at 1250°C

Yanqiang Qiao, Maoyuan Li, Xiping Guo

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The aims of this study were to develop silicide coatings for Nb-NbCr₂ alloy and to evaluate their oxidation behavior. Both of the coatings prepared by single deposition of Si and co-deposition of Si-Y were composed of (Nb,Cr)Si₂ and (Cr,Nb)Si₂, showing a similar structure. After oxidation at 1250°C for 50h, the weight gains of the bare alloy and the un-modified silicide coating were 246.9 and 90.3mg/cm² respectively, while the weight gain of Y-modified silicide coating was only 13.1mg/cm². The introduction of Y³⁺ in the scale showed a suppressing effect on the outward diffusion of chromium cations and the inward migration of oxygen anions, thereby retarding the oxide scale growth rate of the silicide coating at 1250°C in static air.

Original language	English
Pages (from-to)	921-930
Number of pages	10
Journal	Surface and Coatings Technology
Volume	258
DOIs	https://doi.org/10.1016/j.surfcoat.2014.07.058
State	Published - 15 Nov 2014

Keywords

Intermetallic
Oxidation
Pack cementation
Silicide coating

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10.1016/j.surfcoat.2014.07.058

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title = "Development of silicide coatings over Nb-NbCr2 alloy and their oxidation behavior at 1250°C",

abstract = "The aims of this study were to develop silicide coatings for Nb-NbCr2 alloy and to evaluate their oxidation behavior. Both of the coatings prepared by single deposition of Si and co-deposition of Si-Y were composed of (Nb,Cr)Si2 and (Cr,Nb)Si2, showing a similar structure. After oxidation at 1250°C for 50h, the weight gains of the bare alloy and the un-modified silicide coating were 246.9 and 90.3mg/cm2 respectively, while the weight gain of Y-modified silicide coating was only 13.1mg/cm2. The introduction of Y3+ in the scale showed a suppressing effect on the outward diffusion of chromium cations and the inward migration of oxygen anions, thereby retarding the oxide scale growth rate of the silicide coating at 1250°C in static air.",

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T1 - Development of silicide coatings over Nb-NbCr2 alloy and their oxidation behavior at 1250°C

AU - Qiao, Yanqiang

AU - Li, Maoyuan

AU - Guo, Xiping

PY - 2014/11/15

Y1 - 2014/11/15

N2 - The aims of this study were to develop silicide coatings for Nb-NbCr2 alloy and to evaluate their oxidation behavior. Both of the coatings prepared by single deposition of Si and co-deposition of Si-Y were composed of (Nb,Cr)Si2 and (Cr,Nb)Si2, showing a similar structure. After oxidation at 1250°C for 50h, the weight gains of the bare alloy and the un-modified silicide coating were 246.9 and 90.3mg/cm2 respectively, while the weight gain of Y-modified silicide coating was only 13.1mg/cm2. The introduction of Y3+ in the scale showed a suppressing effect on the outward diffusion of chromium cations and the inward migration of oxygen anions, thereby retarding the oxide scale growth rate of the silicide coating at 1250°C in static air.

AB - The aims of this study were to develop silicide coatings for Nb-NbCr2 alloy and to evaluate their oxidation behavior. Both of the coatings prepared by single deposition of Si and co-deposition of Si-Y were composed of (Nb,Cr)Si2 and (Cr,Nb)Si2, showing a similar structure. After oxidation at 1250°C for 50h, the weight gains of the bare alloy and the un-modified silicide coating were 246.9 and 90.3mg/cm2 respectively, while the weight gain of Y-modified silicide coating was only 13.1mg/cm2. The introduction of Y3+ in the scale showed a suppressing effect on the outward diffusion of chromium cations and the inward migration of oxygen anions, thereby retarding the oxide scale growth rate of the silicide coating at 1250°C in static air.

KW - Intermetallic

KW - Oxidation

KW - Pack cementation

KW - Silicide coating

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VL - 258

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JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

ER -

Development of silicide coatings over Nb-NbCr₂ alloy and their oxidation behavior at 1250°C

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Keywords

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