Method for preparing titanium alloys based on aluminum heat self-propagating gradient reduction and slag wash refining

Abstract

The invention discloses a method for preparing titanium alloys based on aluminum heat self-propagating gradient reduction and slag wash refining, and belongs to the technical field of titanium-aluminum alloys. The method comprises the following steps: after raw materials are pretreated, the raw materials are weighed according to a mass ratio of rutile or high titanium slag or titanium dioxide to aluminum powder to V2O5 powder to CaO to KClO3 of 1.0: (0.60-0.24): (0.042-0.048): (0.12-0.26): (0.22-0.30); the aluminum heat self-propagating reaction is performed by adopting a gradient heating mode to obtain high-temperature melts; the gradient reduction smelting is performed; the insulation melt separation is performed after charging; then, CaF2-CaO-TiO2-V2O5 base refining slag is added in the high-temperature melts for slag wash refining; and finally, the slag is removed to obtain the titanium alloys. The method has such advantages as short flow, low energy consumption, simple operation and easy control of Al and V contents in the alloys.

Description

Technical field [0001] The invention belongs to the technical field of titanium and aluminum alloys, and particularly relates to a method for preparing titanium alloys based on aluminothermic self-propagating gradient reduction and slag washing refining. Background technique [0002] Titanium alloys are widely used in aerospace, shipbuilding, national defense, military industry, biomedical and other fields because of their small specific gravity, high specific strength, good high temperature performance, acid and alkali corrosion resistance, and good biocompatibility. The future market is very huge. . At present, the world's annual output of titanium alloy processing materials has reached more than 40,000 tons, and there are nearly 30 types of titanium alloys. Among them, Ti-6Al-4V (TC4) is one of the most widely used ferroalloys, and the application rate accounts for 50% of the total output of titanium alloys. % Or more, accounting for 95% of all titanium alloy processed parts....

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of TiO existing in the preparation of ferro-titanium alloy by the existing outside-furnace thermite method 2 Incomplete reduction, high residual aluminum, high oxygen content, etc., the present invention proposes a method of preparing titanium alloys using high-titanium slag or rutile or titanium dioxide as raw materials, using thermite self-propagating gradient reduction and slag washing refining, which is based on Thermite self-propagating reaction, that is, using rutile or high-titanium slag or titanium dioxide, aluminum powder, etc. as raw materials, adopting the method of gradient feeding to carry out thermite self-propagating reaction to obtain high-temperature melt, and performing gradient reduction smelting, and adopting batch feeding or continuous The feeding method realizes the control of the reaction process and temperature and the complete reduction of metal oxides. After the feeding is completed, the insulation is melted, and then high-basicity CaF is added to the high-temperature melt. 2 -CaO-TiO 2 -V 2 o 5 Base refining slag, adjust the basicity and melting point of slag, carry out slag washing and refining, and finally cool the high-temperature melt to room temperature to remove the upper smelting slag to obtain titanium alloy, which is titanium aluminum vanadium alloy