The theoretical and numerical calculation and experimental study on soft contact electromagnetic casting forming
Based on classical electromagnetic theory, the electromagnetic pressure calculation model and the formula of electromagnetic casting forming have been established. Theoretical and numerical results indicated that the frequency, current density, relative permeability of alloy melt and resistivity can also influence the effect of electromagnetic pressure. Meanwhile, the effect of metal physics properties parameters on the value of electromagnetic pressure is more complicated. The needed magnetic field for casting Al-Si alloys liquid column with length of 0.05m in experiment was very close to the theoretical value. This result indicated that the formula of electromagnetic casting forming can be used to guide experiments and the actual industrial production.
Numerical Simulation of Magnetic Field Distribution in Intermediate-Frequency Soft-Contact Electromagnetic Continuous Casting Mold for Round Billets
The method of numerical simulation is used to research the distribution of magnetic field in the intermediate-frequency soft-contact electromagnetic continuous casting mold for round billets,and the changes of magnetic induction intensity along with the changes of structure parameters of mold,processing parameters and electrical parameters are discussed.The results show that in the intermediate-frequency electromagnetic field,the magnetic induction intensity in mold first increases and then decreases,and the Bz is maximum just below the center height of coil.Comprehensively considering the structure and magnetic permeability of mold,the appropriate slit width is 0.5 mm,and the appropriate slit number is 8,the largest magnetic induction intensity can be obtained when the initial surface of the molten steel is at center height of the coil,and the magnetic induction intensity in mold increases with the increase of induction current intensity and frequency.
Thermodynamics on the Carbochlorination of Titanium-bearing Ores
The equilibrium compositions of the multi-component, multi-phase and multi-reaction system of carbochlorination of titanium-bearing ores are calculated with HSC, a computational chemistry software. The thermodynamic equilibrium calculation of the reaction system shows that a complete conversion of titanium-bearing ores is feasible at a temperature near 200oC. At temperatures ranging from 800 to 1600oC, the products of the reaction system are all in gaseous phase. Thermodynamic analysis accords with the industrial practice. The simulated results provide reasonable scientific basis for improving suitable technological conditions of the carbochlorination reduction.