A high temperature equilibration experiment was carried out to investigate the effect of oxygen partial pres- sure on the phase equilibria and liquidus in CaO-Al2O3- FeOx system with the intermediate oxygen partial pressures of 10.13 Pa and 1.01 × 10^-3 Pa. The equilibrated phases and their compositions of the quenched samples were analyzed by using SEM/EPMA (Scanning Electron Microscope/Electron Probe Micro Analysis) and XRD (X Ray Diffraction). The phase equilibrium results include two cases, the two phase coexistence and the three-phase coexistence in the high Al2O3 region with oxygen partial pressure of either 10.13 Pa or 1.01 × 10^-3 Pa. Effects of oxygen partial pressure and temperature on the liquidus along the primary phase fields of CaO · Al2O3 and CaO · 2Al2O3 were nota hle. With the decrease of oxygen partial pressure, the liquid area expands and the liquidus of CaO · Al2O3 and CaO · 2Al2O3 primary fields moves to the Al2O3-FeOx region. On the other hand, the liquid area of CaO Al2O3-FeOx sys tem extends extremely to the high Al2O3 region with the temperature increasing from 1 400 to 1 500℃, especially at lower oxygen partial pressure. The present experiment results are in good agreement with the calculated ones by FactSage.
参考文献
| [1] | Decterov S A;Kang Y B;Jung I H .Thermodynamic Database for the AI Ca Co-Cr-Fe Mg Mn-Ni Si O P-S System and Appli cations in Ferrous Process Metallurgy[J].Journal of Phase Equilibria and Diffusion,2009,30(05):443. |
| [2] | Wang N;Zou Z S;Zhang Z et al.Effect of Oxygen Partial Pressure and Temperature on Liquidus for the CaO-SiOa FeO2-A12Oa System[J].Current Advances in Materials and Processes,2011,295-297:2279. |
| [3] | Jak E.;Hayes PC.;Pelton AD.;Degterov S. .Thermodynamic modelling of the system Al2O3-SiO2-CaO-FeO-Fe2O3 to predict the flux requirements for coal ash slags[J].Fuel,1998(1/2):77-84. |
| [4] | Muan A;Gee C L .Phase Equilibrium Studies in the System Iron Oxide-A1203 in Air and at latin 02 Pressure[J].Journal of the American Ceramic Society,1956,39(06):207. |
| [5] | Dayal R R;Glasser F P .Phase Relations in the System CaO Al203-FezOa[J].Science of Ceramics,1967,3:191. |
| [6] | Newkirk T F;Thwaite R D .Pseudoternary System Calcium Oxide-Monocalcium Aluminate-Dicalcium Ferrite[J].Journal of Research of the National Bureau of Standards,1958,61(04):233. |
| [7] | Espejo V;Iwase M .A Thermodynamic Study of the System CaO-A12Oa-FexO at 1 673 K[J].Metallurgical and Materials Transactions,1995,26B(04):257. |
| [8] | Turkdogan E T.Physical Chemistry of High Temperature Technology[M].New York:Academic Press,Inc,1980 |
| [9] | Bale C W;B61isle E;Chartrand P et al.FactSage Thermo chemical Software and Databases Recent Development[J].CALPHAD-Computer Coupling of Phase Diagrams and Thermochemistry,2009,33:295. |
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