High temperature isothermal oxidation behavior of NbSi 2 coating at 1000–1450 °C

Choi, Young Jun; Yoon, Jin Kook; Kim, Gyeung Ho; Yoon, Woo Young; Doh, Jung Man; Hong, Kyung Tae

doi:10.1016/j.corsci.2017.10.002

Cited by 37 publications

(13 citation statements)

References 47 publications

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“…Therefore, it can be inferred that the presence of the single NbSi 2 phase in the silicide coating failed to provide surface protection against oxidation. These results are in agreement with those reported in the literature [10,11]. By combining this finding and those reported in the literature [10,11], it was inferred that the presence of Nb 5 Si 3 layer between NbSi 2 and matrix Nb is necessary [24].…”

Section: Isothermal Oxidation Studysupporting

confidence: 93%

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High temperature behaviour of NbSi₂ coating on the Nb-1Zr-0.1C alloy

Tyagi

Ghosh

Tewari

2019

Surface Engineering

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High temperature behaviour of NbSi 2 coatings on the Nb-1Zr-0.1C alloy, developed using the molten salt technique, has been investigated. For this purpose, samples were aged at different temperatures under vacuum and in the ambient atmosphere. High temperature annealing between 1200 and 1400°C of the coating under vacuum led to the formation of a layered structure comprising various silicide phases and porous microstructures. The formation of the porous structure was rationalised on the basis of differential diffusion mechanism of elemental species. The high temperature annealing in an ambient atmosphere showed that the single layer of NbSi 2 coating formed on the Nb alloy was found insufficient to provide protection at high temperatures under oxidising environments. By introducing intermediate coating, concentrations and effective size of pores were reduced. Based on the EDS analysis, density of the pores and their size distribution, a mechanism involving diffusion of Nb/Si in the formation of Nb 5 Si 3 has been proposed.

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Section: Isothermal Oxidation Studysupporting

confidence: 93%

“…These results are in agreement with those reported in the literature [10,11]. By combining this finding and those reported in the literature [10,11], it was inferred that the presence of Nb 5 Si 3 layer between NbSi 2 and matrix Nb is necessary [24].…”

Section: Isothermal Oxidation Studysupporting

confidence: 93%

High temperature behaviour of NbSi₂ coating on the Nb-1Zr-0.1C alloy

Tyagi

Ghosh

Tewari

2019

Surface Engineering

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“…An improvement in the oxidation resistance of Nb-Si based alloys has been performed via HAPC process by deposition and codeposition of elements such as Si, Al, Mo, B, Cr, Ti and Fe 4,7,[18][19][20] . In spite of efforts to develop modified aluminide coating, the silicate-based coatings have greater potential for protection at high-temperatures 5,21,22 .…”

Section: Introductionmentioning

confidence: 99%

Fe-Cr-Si Codeposition on Nb-Si based Alloys via Halide Activated Pack Cementation to Improve Oxidation Resistance

et al. 2020

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The coating formation by Fe-Cr-Si codeposition was done in a single step via Halide Activated Pack Cementation (HAPC) on Nb-Si alloy with the aim of improving the oxidation resistance. The activator salt and temperature selections for HAPC process were obtained by thermodynamic analysis. The isothermal oxidation test results for the coated alloy at 1200 °C for 62 h showed good oxidation resistance. The mass gain was 17.5 mg/cm 2. Furthermore, no cracks and spallation on the oxide layers were observed for the coated alloy after the oxidation test, being that the oxidative kinetics curve is in accordance with the parabolic rate law. On the other hand, total oxidation was observed for the uncoated alloy after 12 h at 1200 °C in the isothermal oxidation test. The mass gain was 49.27 mg/cm 2 and several cracks and spallation on the oxide layers led to a severe oxidation process.

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“…However, the oxidation resistance of silicides and eutectic alloys should be clarified. The oxidation behavior of several silicides has been reported . For example, Strydom and Lombaard reported the oxidation behavior of various silicides in dry oxygen .…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation behavior of several silicides has been reported. 19,[31][32][33][34][35][36][37][38][39][40][41] For example, Strydom and Lombaard reported the oxidation behavior of various silicides in dry oxygen. 34 Most of the examined silicides formed SiO 2 , and the oxidation resistance was similar to that of Si.…”

mentioning

confidence: 99%

Oxidation mechanisms of SiC‐fiber–reinforced Si eutectic alloy matrix composites at elevated temperatures

et al. 2019

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SiC‐fiber–reinforced binary Si eutectic alloy composites have been developed for aerospace applications using the melt infiltration method. In this study, the oxidation mechanisms of various binary Si eutectic alloys were evaluated at elevated temperatures. We suggest that the oxidation resistance of eutectic alloys could be predicted using the Gibbs energy change for the oxidation reaction. Based on these calculations, eutectic alloys of Si‐16at%Ti, Si‐17at%Cr, Si‐22at%Co, Si‐38at%Co, and Si‐27at%Fe were prepared. These alloys produced uniform SiO2 layers and showed the same oxidation resistance as Si at 1000°C under humid conditions. Therefore, SiC composites using Si alloys with excellent oxidation resistance can be predicted using thermodynamic calculations.

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High temperature isothermal oxidation behavior of NbSi 2 coating at 1000–1450 °C

Cited by 37 publications

References 47 publications

High temperature behaviour of NbSi₂ coating on the Nb-1Zr-0.1C alloy

High temperature behaviour of NbSi₂ coating on the Nb-1Zr-0.1C alloy

Fe-Cr-Si Codeposition on Nb-Si based Alloys via Halide Activated Pack Cementation to Improve Oxidation Resistance

Oxidation mechanisms of SiC‐fiber–reinforced Si eutectic alloy matrix composites at elevated temperatures

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High temperature isothermal oxidation behavior of NbSi 2 coating at 1000–1450 °C

Cited by 37 publications

References 47 publications

High temperature behaviour of NbSi2 coating on the Nb-1Zr-0.1C alloy

High temperature behaviour of NbSi2 coating on the Nb-1Zr-0.1C alloy

Fe-Cr-Si Codeposition on Nb-Si based Alloys via Halide Activated Pack Cementation to Improve Oxidation Resistance

Oxidation mechanisms of SiC‐fiber–reinforced Si eutectic alloy matrix composites at elevated temperatures

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Resources

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High temperature behaviour of NbSi₂ coating on the Nb-1Zr-0.1C alloy

High temperature behaviour of NbSi₂ coating on the Nb-1Zr-0.1C alloy