Thermodynamic Evaluation of the Si-C-Al-Y-O System for LPS-SiC Application

Pan, Zhu; Fabrichnaya, Olga; Seifert, H. J.; Neher, R.; Brandt, K.; Herrmann, Matthias

doi:10.1007/s11669-010-9695-7

Cited by 37 publications

(15 citation statements)

References 57 publications

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“…Combining expressions (10) and (12) and converting partial pressures to ion intensities with equation (3) gives:…”

Section: (1) Starting Materials and Knudsen Effusion Mass Spectrometrymentioning

confidence: 99%

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Silica Activity Measurements in the Y₂O₃–SiO₂ System and Applications to Modeling of Coating Volatility

Jacobson

2014

J. Am. Ceram. Soc.

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Rare‐earth silicate compounds, such as those in the Y2O3–SiO2 system, are promising candidates for coatings of SiC‐based ceramics and ceramic matrix composites in combustion environments. The predicted lower activity of silica in these silicates will lead to less reactivity with the water vapor combustion products. A procedure for measuring silica activities in this system is discussed. Knudsen effusion mass spectrometry is used and the measured vapor pressure of SiO(g) is correlated to activity. Due to the low vapor pressure of SiO(g) in the temperature range of interest, a reducing agent is utilized to boost this vapor pressure without altering the solid‐state composition. In addition, corrections are made for nonequilibrium vaporization. The measured silica activities are: Y2O3 + Y2O3·SiO2 two phase field: log[a(SiO2)] = −5200.26(1/T) + 0.0567 (1532 < T(K) < 1670) Y2O3·SiO2 + Y2O3·2SiO2 two phase field: log[a(SiO2)] = 4.2252(1/T)−0.5531 (1628 < T(K) < 1747) It is shown how these results can be used to predict reduced volatilization rates of the coatings.

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“…Combining expressions (10) and (12) and converting partial pressures to ion intensities with equation (3) gives:…”

Section: (1) Starting Materials and Knudsen Effusion Mass Spectrometrymentioning

confidence: 99%

“…measured the enthalpy of formation of the monosilicate. Frabrichnaya et al . developed a Calphad‐type database for this system.…”

Section: Introductionmentioning

confidence: 99%

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Silica Activity Measurements in the Y₂O₃–SiO₂ System and Applications to Modeling of Coating Volatility

Jacobson

2014

J. Am. Ceram. Soc.

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“…A detailed description of this modified database is given by Pan et al 11 . All thermodynamic calculations of this work use this description.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

Liquid phase formation in the system SiC, Al2O3, Y2O3

Neher

Herrmann

Brandt

et al. 2011

Journal of the European Ceramic Society

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“…Y 2 O 3 -Al 2 O 3 as sintering additives of SiC ceramic have been used for many years [3] [4]. The phase relationship of SiC-Y 2 O 3 -Al 2 O 3 system has also been studied by calculation [5] and experiment [6]. However a few of SiO 2 on SiC surface caused by oxidation of SiC has the non-ignorable effect on the sintering of SiC-Y 2 O 3 -Al 2 O 3 system at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Phase Relations in Si-Al-Y-O-C Systems

Yinchuan¹

2015

MSCE

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The present work investigated the phase relations in SiC-Al2O3-Y2O3-SiO2 (Si-Al-Y-O-C) system. As a continuation of our previous works, the purpose of this study is to understand the high temperature reaction behaviors of SiO2 in the system and its effect on the phase relations of the valuable system of SiC-Al2O3-Y2O3. The phase compositions of six solid-state reacted samples with different components of Y2O3:Al2O3:SiC:SiO2 were analyzed by XRD. The phase relations of the systems were determined. The subsolidus phase diagrams of ternary Al2O3-SiC-SiO2 system and the tentative phase diagram of an extended quaternary Y2O3-Al2O3-SiC-SiO2 system were presented latter involving several coexisting regions of four phases. The high temperature reaction behavior of SiO2 in the system and its effect on the phase relations of system were discussed.

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Thermodynamic Evaluation of the Si-C-Al-Y-O System for LPS-SiC Application

Cited by 37 publications

References 57 publications

Silica Activity Measurements in the Y₂O₃–SiO₂ System and Applications to Modeling of Coating Volatility

Silica Activity Measurements in the Y₂O₃–SiO₂ System and Applications to Modeling of Coating Volatility

Liquid phase formation in the system SiC, Al2O3, Y2O3

Phase Relations in Si-Al-Y-O-C Systems

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Thermodynamic Evaluation of the Si-C-Al-Y-O System for LPS-SiC Application

Cited by 37 publications

References 57 publications

Silica Activity Measurements in the Y2O3–SiO2 System and Applications to Modeling of Coating Volatility

Silica Activity Measurements in the Y2O3–SiO2 System and Applications to Modeling of Coating Volatility

Liquid phase formation in the system SiC, Al2O3, Y2O3

Phase Relations in Si-Al-Y-O-C Systems

Contact Info

Product

Resources

About

Silica Activity Measurements in the Y₂O₃–SiO₂ System and Applications to Modeling of Coating Volatility

Silica Activity Measurements in the Y₂O₃–SiO₂ System and Applications to Modeling of Coating Volatility