A method for preparing titanium-aluminum alloy based on thermite self-propagating-injection deep reduction

Abstract

A method for preparing titanium-aluminum alloy based on aluminothermic self-propagation-injection deep reduction, belonging to the technical field of titanium-aluminum alloy. Titanium oxide and aluminum powder are used as raw materials, and a high-temperature melt is obtained by aluminous heat self-propagation reaction. The high-temperature melt is then transferred to a medium frequency induction furnace for heat preservation and melting separation. The upper layer is alumina-based slag and the lower layer is titanium. Aluminum alloy melt; CaF2-CaO pre-melted slag is sprayed into the alumina-based slag layer in a bottom blowing manner, the slag is washed and refined, and then high temperature is injected into the high-temperature alloy melt in a bottom blowing manner carried by an inert carrier gas Calcium steam or magnesium high-temperature steam and alloy components are used for deep reduction and refining; finally, the high-temperature melt is cooled to room temperature and the upper smelting slag is removed to obtain a titanium-aluminum alloy. The method of the invention has the advantages of short process, low energy consumption, simple operation, etc. Oxygen in the prepared titanium-aluminum alloy is completely removed, and at the same time, gas inclusions such as nitrogen and hydrogen in the titanium-aluminum alloy are effectively removed.

Description

technical field [0001] The invention belongs to the technical field of titanium-aluminum alloys, and in particular relates to a method for preparing titanium-aluminum alloys based on thermite self-propagation-injection deep reduction. Background technique [0002] Titanium is known as the third largest metal after iron and aluminum. Titanium and titanium alloys are irreplaceable strategic materials for national economic development and national defense construction. They are widely used in aviation, chemical industry, weapons, nuclear industry, sports equipment, medical treatment and new products. energy and other fields. Titanium-aluminum alloy is well-known as a potential high-temperature resistant alloy material. Since the mid-1980s, the research on the basic theory and application of two-way alloys has been increased, so that the titanium-based γ phase (TiAl) and α phase (TiAl) 3 Al) material properties have made a breakthrough. This special structure has a very low m...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of long process, complex process, high energy consumption and large pollution existing in the existing utilization process of metal titanium and titanium alloy based on the Kroll method, the present invention proposes to use titanium oxide as raw material and adopt thermite self-propagating - A new idea of ​​directly preparing titanium-aluminum-based alloys by blowing deep reduction, that is, first using titanium oxide and aluminum powder as raw materials, using thermite self-propagating reaction to obtain a high-temperature melt, and then transferring the obtained high-temperature melt to a medium-frequency induction furnace Carry out insulation smelting and separation to obtain the upper layer of alumina-based slag and the lower layer of titanium-aluminum alloy melt; spray CaF to the alumina-based slag layer by bottom blowing 2 -CaO pre-melting slag, carry out slag washing and refining, and then blow high-temperature calcium steam or magnesium high-temperature steam and alloy components into the high-temperature alloy melt in the way of bottom blowing through the inert carrier gas to carry out deep reduction refining; finally, the high-temperature molten The body is cooled to room temperature to remove the upper part of the smelting slag to obtain titanium aluminum alloy