Phase diagram estimation of the Al2O3-SiO2-Re2O3 systems |
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| Authors: | Lin Li Zhu-jun Tang Wei-ying Sun Pei-ling Wang |
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| Institution: | (1) School of Material Science and Engineering, Shanghai University, 200072 Shanghai, China;(2) State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, 200050 Shanghai, China |
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| Abstract: | Nine limiting binaries of Al2O3-SiO2-Re2O3(Re=Nd, Sm, Gd and La) system are assessed. The binary diagrams or experimental information from Toropov, Mizuno, Aramaki,
Bondar, Rolin and Coutures are optimized with the substitutional model of Kaufman and Nesor and the approximate formula of
fusion free energy for rare earth element oxides of Wu and Pelton. The extracted Gibbs free energies of pure solid oxides
and stoichiometric phases and the solution parameters are used to estimate the corresponding binaries, liquidus surfaces and
a series of isothermal sections of four ternaries Al2O3-SiO2-Nd2O3, Al2O3-SiO2-Sm2O3, Al2O3-SiO2-Gd2O3, and Al2O3-SiO2-La2O3. In the Al2O3-SiO2-Gd2O3 system samples as fired at exact temperature with different compositions were analyzed by X-ray diffractometer and the detected
results are fitted with the calculation of isothermal sections.
Supported by State Key Lab of High Performance Ceramics and Superfine Micro-structure (9517 and 9708) |
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| Keywords: | limiting binary assessment ternary system isothermal section liquidus surface |
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