The oxidation behavior of high Cr and Al containing Nb-Si-Ti-Hf-Al-Cr alloys at 1200 and 1250 °C

Su, Lijuan; Jia, Lina; Jiang, Kaiyong; Zhang, Hu

doi:10.1016/j.ijrmhm.2017.08.006

Cited by 62 publications

(8 citation statements)

References 29 publications

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“…Table 1 lists several studies related to oxidation tests involving Nb-Si based alloys. The Fe-Cr-Si coating applied to Nb ss /Nb 5 Si 3 alloy in this work showed significant improvements in oxidation resistance compared to uncoated alloys from other studies containing various elements in its compositions, such as Al and Cr, which provide this resistance, except for an alloy containing a high concentration of these elements presented by the work of Su et al 32 . On the other hand, other types of coatings presented in Table 1 have shown to be better in oxidation tests when compared to the coated alloy of this study, showing values below 2.638 mg 2 /cm 4 .h, with the exception of two alloys coated with Si-Al-Y 30 and Si-Y 29 , with values of 62.6 and 5.1 mg 2 /cm 4 .h, respectively.…”

Section: Fe-cr-si Codeposition On Nb-si Alloy Via Hapc Processmentioning

confidence: 58%

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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Section: Fe-cr-si Codeposition On Nb-si Alloy Via Hapc Processmentioning

confidence: 58%

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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“…Additions of Ge and B promote the formation of a more compact and protective oxide scale, thus improving oxidation resistance [21]. A similar compact oxide scale is observed in Nb-Si-based alloys containing high levels of Al and Cr [22]. Small additions of rare earth elements can significantly enhance the oxidation resistance of metals as well as coatings [23][24][25].…”

Section: Introductionmentioning

confidence: 71%

The Oxidation Resistance of Nb-Si-Based Alloys at Intermediate and High Temperatures

et al. 2020

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The oxidation behavior of three Nb-Si-based alloys were evaluated at intermediate (800 °C) and high (1250 °C) temperatures for 100 h in air. At 800 °C, the Nb-24Ti-15Si-13Cr-2Al-2Hf (at. %) alloy suffered from catastrophic pest oxidation. This pest phenomenon was suppressed by the addition of Sn. However, Ta addition protected the Nb-Si-based alloys from pest oxidation for a short time. At 1250 °C, Sn could enhance the oxidation resistance of Nb-Si-based alloys due to the formation of a Sn-rich layer. In addition, the oxidation mechanisms of Nb-Si-based alloys at intermediate and high temperatures were discussed.

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“…Moreover, the studies of Zelenitsas [48] and Esparza [49] show that the synergy of Cr and Al can form the protective Al2O3/CrNbO4 film and reduce the oxidation rate inside the alloy. The Cr element has stronger O affinity than Nb, and the formation of stable Cr2O3 can improve the compactness and stability of the oxide layer [50][51][52]; thus, the alloy has better oxidation resistance.…”

Section: Nb-si-based Alloys Modified With Cr Elementsmentioning

confidence: 99%

“…The Al2O3 protective film will be produced after the oxidation of Al, which has a good protective ability on the substrate. Esparza [49] and Su [52] et al point out that a certain amount of Al is beneficial to prolong the service life of Nb-Si-based superalloys. However, because Al reduces the melting point of the alloy, this alloy is not suitable for a high-temperature oxidation environment.…”

Section: Nb-si-based Alloys Modified With Other Elementsmentioning

confidence: 99%

Microstructure and Oxidation Behavior of Nb-Si-Based Alloys for Ultrahigh Temperature Applications: A Comprehensive Review

Shen

et al. 2021

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Nb-Si-based superalloys are considered as the most promising high-temperature structural material to replace the Ni-based superalloys. Unfortunately, the poor oxidation resistance is still a major obstacle to the application of Nb-Si-based alloys. Alloying is a promising method to overcome this problem. In this work, the effects of Hf, Cr, Zr, B, and V on the oxidation resistance of Nb-Si-based superalloys were discussed. Furthermore, the microstructure, phase composition, and oxidation characteristics of Nb-Si series alloys were analyzed. The oxidation reaction and failure mechanism of Nb-Si-based alloys were summarized. The significance of this work is to provide some references for further research on high-temperature niobium alloys.

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The oxidation behavior of high Cr and Al containing Nb-Si-Ti-Hf-Al-Cr alloys at 1200 and 1250 °C

Cited by 62 publications

References 29 publications

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

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

The Oxidation Resistance of Nb-Si-Based Alloys at Intermediate and High Temperatures

Microstructure and Oxidation Behavior of Nb-Si-Based Alloys for Ultrahigh Temperature Applications: A Comprehensive Review

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