About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Computational Thermodynamics and Kinetics
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Presentation Title |
High-Temperature Refractory Al-M-Si-O (M= Nb, Ta) Systems |
Author(s) |
Julian Gebauer, Peter Franke, Hans Jürgen Seifert |
On-Site Speaker (Planned) |
Julian Gebauer |
Abstract Scope |
Refractory metal-alumina composites are investigated for a new generation of coarse-grained composites. For the CALPHAD-type assessments key experiments are used to determine phase compositions, homogeneity ranges, thermochemical and thermophysical properties. According to the planned conditions of use of the composites, the samples were placed in the composition ranges M-Al2O3-SiO2-M2O5 (M=Nb, Ta). XRD experiments show that AlTaO4 is a stoichiometric phase and the only ternary oxide in the quasi-binary section Al2O3-Ta2O5. XRD patterns of quenched samples are used to determine the solubility of Al2O3 in α-Ta2O5 and β-Ta2O5. The same procedure is applied to determine the dissolution of SiO2 in Nb2O5, α-Ta2O5 and β-Ta2O5. Based on the present experimental results and evaluations of binary systems from the literature and own (re-)assessments of Nb-O and O-Ta, thermodynamic datasets will be presented which describe both quaternary systems, Al-M-Si-O (M=Nb, Ta), from the melt down to room temperature. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Computational Materials Science & Engineering, Composites |