Ti has high specific strength and relatively low density compared to other metals and it also has excellent corrosion resistance. so, It is used in many fields including aerospace, chemical plant. However, A large amount of off-grade Ti sponge with h...
Ti has high specific strength and relatively low density compared to other metals and it also has excellent corrosion resistance. so, It is used in many fields including aerospace, chemical plant. However, A large amount of off-grade Ti sponge with high oxygen contnet is generated During smelting and processing. So it is necessary to carry out the deoxidation research in order to improve the utilization of off-grade Ti sponge.
In this work, off-grade Ti sponge was deoxidized using Mg and a chloride mixture as the reductant and flux, respectively. the effects of the reaction time, reaction temperature, quantitiy of Mg, chloride ratio and pickling condition on deoxidation were investigated. Notably, when YCl3 is used as the flux to react with MgO, it is possible to reduce the activity of MgO. Therefore Ti can be deoxidized using Mg.
When the mole fraction of YCl3 in chloride was 0.8, the oxygen concentration of the Ti sponge was deoxideized to 0.085 wt% at 1,073 K, 15 hours.
Since Ti deoxidation limit is lower at low temperature through thermodynamic calculations, Lower oxygen content in Ti was obtained at low temperature. The oxygen content in Ti was deoxidized to 0.082 wt% at 15 h, =0.22, 973 K, . At high temperature, on the other hand, the deoxidation limit is high. So the oxygen contnent in Ti was 0.499 wt%, similar to the initial oxygen content, because by-products were trapped in Ti particles due to sintering and could not be removed during the water and pickling process.