A study on phase equilibria in the CaO-Al2O3-SiO2-“Nb2O5”(5 mass pct) system in reducing atmosphere

  • Baijun Yan Dept. of Physical Chemistry of Metallurgy University of Science & Technology Beijing

Abstract


Phase equilibria in 5 mass% “Nb2O5” plane of CaO-Al2O3-SiO2-“Nb2O5” system at 1873 K in an oxygen partial pressure of 1.78×10-6 Pa have been investigated through isothermal equilibration and quenching followed by EPMA examinations. In order to characterize the effect of niobium oxide on the phase relationship of the CaO-Al2O3-SiO2 system, Nb2O5-containing and Nb2O5 -free samples with the same CaO/Al2O3/SiO2 weight ratio were investigated simultaneously. The ratios of CaO/Al2O3/SiO2 were selected from the CaO·2Al2O3-liquid two-phase equilibrium region in the CaO-Al2O3-SiO2 system at1873 K. It was found that the adding of 5 mass% Nb2O5 to the CaO-Al2O3-SiO2 system caused the original CaO·2Al2O3-liquid equilibrium to become three different new equilibria. The three equilibria were single liquid phase, CaO·6Al2O3-liquid and gehlenite-CaO·2Al2O3-liquid equilibrium respectively. The gehlenite phase may be a new solid solution of 2CaO·Al2O3·SiO2 and NbOx with melting point higher than 1873 K.

Author Biography

Baijun Yan, Dept. of Physical Chemistry of Metallurgy University of Science & Technology Beijing

Associate Professor Baijun Yan

Dept. of Physical Chemistry of Metallurgy

University of Science & Technology Beijing

30 Xue Yuan Road, Beijing 100083

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Published
2014/02/10
How to Cite
Yan, B. (2013). A study on phase equilibria in the CaO-Al2O3-SiO2-“Nb2O5”(5 mass pct) system in reducing atmosphere. Journal of Mining and Metallurgy, Section B: Metallurgy, 49(2), 145. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/2438
Issue
Vol. 49 No. 2 (2013)
Section
Plenary lectures and/or individual papers given at conferences

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