High-temperature oxidation of yttrium silicides

Golden, Robert A.; Opila, Elizabeth J.

doi:10.1007/s10853-017-1823-x

Cited by 21 publications

(9 citation statements)

References 48 publications

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“…In particular, rare-earth silicates and silicides are considered as potential candidates for environmental barrier coatings (EBCs) for aero-gas turbine engines [13][14][15][16][17][18][19][20]. EBCs are mainly composed of two layers of coating: a topcoat and a bond coat.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some researchers have evaluated the degradation behavior of rare-earth silicides for their application as advanced bond coat materials [17][18][19][20]. They investigated the degradation behaviors of Yb3Si5 and Yb5Si3 at temperatures up to 1200 °C in air, steam, and mixed environments because their melting point is higher than that of Si [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of the Oxidation Behavior of Yb-Gd-Si Ternary Alloys at Low Temperatures via Ti Addition

Arai

Morigayama

Aoki

et al. 2021

Preprint

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To improve the oxidation behavior of Yb-Gd-Si, 0.5 and 1 at% of Ti-containing Yb-Gd-Si (denoted as YGTS-0.5 and YGTS-1, respectively) were fabricated by arc melting. The oxidation behaviors of both YGTS specimens were evaluated by oxidation tests performed in a temperature range of 600–1200 °C for 1, 2, 4, and 8 h in air. Additionally, thermogravimetric analysis (TGA) was conducted at the abovementioned temperature range in air and steam. Oxidation tests at 1200 °C revealed no significant changes in the oxidation rate. Moreover, the oxidation tests revealed that Yb-Gd-Si and YGTS-0.5 became powdery after oxidation, whereas YGTS-1 maintained its form. Detailed microstructural observations indicated that the formation of TiO2 and other oxides in the Yb-Ti-O phase and oxide-containing Yb, Gd, Ti, and Si suppressed the formation of Yb2O3, which caused drastic oxidation at intermediate temperatures (600–900 °C). These results indicated that the addition of 1 at% of Ti to Yb-Gd-Si was effective in improving its oxidation behavior.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of the Oxidation Behavior of Yb-Gd-Si Ternary Alloys at Low Temperatures via Ti Addition

Arai

Morigayama

Aoki

et al. 2021

Preprint

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show abstract

“…In order to address above problems, there are mainly two strategies. One is to develop a more oxidation and water–vapor resistant CMCs, such as to employ an oxidation and water vapor-resistant compounds to modify both interphase 8 , 9 and matrix 10 , 11 of CMCs. This work is still under way.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental investigation of Xenotime-type rare earth phosphate REPO4, (RE = Lu, Yb, Er, Y and Sc) for potential environmental barrier coating applications

Han

Wang

Liu

et al. 2020

Sci Rep

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& fan Wan the mechanical and thermophysical properties of Xenotime-type Repo 4 (Re = Lu, Yb, er, Y and Sc) have been theoretically and experimentally investigated for a potential environmental barrier coating (eBc) topcoat application. the results show that the current studied Repo 4 exhibits a quasiductile property, suggesting a potential long life expectancy of its made coatings. further, from the study of underlying parameters governing thermophysical properties of a ceramic, low thermal expansion coefficients (TECs) and low thermal conductivities cannot be achieved simultaneously, due to mutual exclusive nature of above two parameters. Repo 4 has been unveiled to have rather small tecs, attributing partly to its weak lattice anharmonicity, and is thus well-matched with silicon carbide based ceramic matrix composites. Last, the current investigated Repo 4 exhibits very good high-temperature water vapor corrosion resistance, excellent calcium-magnesium aluminosilicates (cMAS) resistance as well as excellent chemical compatibility with silicon bond coats at elevated temperatures. therefore, the Xenotime-type rare earth phosphates are a promising eBc topcoat material. In order to achieve a higher thermal efficiency, according to Carnot Cycle, there is endless driving force to increase the inlet temperature of advanced gas turbines 1-3. With the increase of operation temperatures, it of course imposes more thermal loads to hot-section components, and hence makes the thermal environment more deteriorate and thus severely challenges corresponding materials. Unfortunately, the conventional nickel based superalloys cannot survive these demanding environments, and silicon carbide based ceramic matrix composites (CMCs) are a promising candidate to replace those superalloys due to a combination of superior properties such as: superior high-temperature mechanical properties, excellent oxidation/thermal shock resistances, high reliability and damage tolerance, low densities, as well as their excellent high temperature stability, which is capable of surviving temperatures higher than 1,400 °C, a temperature well above superalloy's upper limit 4. However, one fatal drawback of silicon carbide based CMCs as a gas turbine hot-section component is that they tend to react with high-temperature water vapor, a byproduct of fuel combustion, which results in a rapid recession of CMCs and thus cannot satisfy the reliability and durability criteria for aero-engine application. In this sense, the prevention and protection of silicon carbide based CMCs in high-temperature combustion gases that are both oxidative and rich in water vapor is the core and bottleneck technology 5-7. In order to address above problems, there are mainly two strategies. One is to develop a more oxidation and water-vapor resistant CMCs, such as to employ an oxidation and water vapor-resistant compounds to modify both interphase 8,9 and matrix 10,11 of CMCs. This work is still under way. The other strategy is more direct and

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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 oxidation of yttrium silicides

Cited by 21 publications

References 48 publications

Improvement of the Oxidation Behavior of Yb-Gd-Si Ternary Alloys at Low Temperatures via Ti Addition

Improvement of the Oxidation Behavior of Yb-Gd-Si Ternary Alloys at Low Temperatures via Ti Addition

Theoretical and experimental investigation of Xenotime-type rare earth phosphate REPO4, (RE = Lu, Yb, Er, Y and Sc) for potential environmental barrier coating applications

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

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High-temperature oxidation of yttrium silicides

Cited by 21 publications

References 48 publications

Improvement of the Oxidation Behavior of Yb-Gd-Si&nbsp;Ternary Alloys at Low Temperatures via Ti Addition

Improvement of the Oxidation Behavior of Yb-Gd-Si&nbsp;Ternary Alloys at Low Temperatures via Ti Addition

Theoretical and experimental investigation of Xenotime-type rare earth phosphate REPO4, (RE = Lu, Yb, Er, Y and Sc) for potential environmental barrier coating applications

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

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Improvement of the Oxidation Behavior of Yb-Gd-Si Ternary Alloys at Low Temperatures via Ti Addition

Improvement of the Oxidation Behavior of Yb-Gd-Si Ternary Alloys at Low Temperatures via Ti Addition