Abstract
A novel continuous and controllable combustion synthesis process for fabrication of TiAl alloy from TiO2, Al, KClO3 and CaO was developed in this paper. The effects of different material ratios on the composition of alloy and the separation effect of alloy and slag were studied. Based on the mass action concentration model, the phase equilibrium composition of Ti-O-Al system at 1800 K was also investigated. The as-cast TiAl alloys were analyzed by X-ray diffractometer, scanning electron microscope, inductively coupled plasma emission spectrometer and Oxygen/Nitrogen/Hydrogen analyzer. According to the comparison between theoretical calculation and experimental results, the variation trends for the alloy composition from experiment are well consistent with calculation results along the increase of Al addition amounts in raw materials. The analyzed composition of alloy for Ti, Al and O are 56.53, 40.99 and 1.09 (wt. %), respectively. This present method hopefully supplied an efficient way for preparation of Ti- or Al-based alloys.
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