A study on phase equilibria in the CaO-Al2O3-SiO2-“Nb2O5(5 mass pct) system in reducing atmosphere
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.
phase equilibrium “Nb2O5- CaO-Al2O3-SiO2 system reducing atmosphere
Baijun Yan Ruibing Guo Jiayun Zhang
State Key Laboratory of Advanced Metallurgy, University of Science and Technology of Beijing, Beijin School of Metallurgical and Ecological Enginnering, University of science and Technology Beijing, Be
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-11
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）