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

Abstract

The invention discloses a method for preparing a titanium aluminum alloy based on aluminum heat self-propagation-injection depth reduction, and belongs to the technical field of the titanium aluminum alloy. A titanium oxide and aluminum powder serve as raw materials; a high-temperature melt is obtained through the aluminum heat self-propagation reaction, and is transferred into a medium-frequency induction furnace for the insulation smelting separation to obtain aluminum oxide base slag at the upper layer and a titanium aluminum alloy melt at the lower layer; CaF2-CaO pre-molten slag is injected to the aluminum oxide base slag layer in a bottom blowing manner for washing and refining; high-temperature calcium steam or high-temperature magnesium steam and alloy components are injected into the high-temperature alloy melt through the carrying of inert carrier gases in the bottom blowing manner for performing the depth reduction refining; and finally, the high-temperature melt is cooled to the room temperature to remove the slag at the upper part to obtain the titanium aluminum alloy. The method has such advantages as short flow, low energy consumption and simple operation; oxygen in the prepared titanium aluminum alloy is totally removed; and the gas inclusion of nitrogen and hydrogen in the titanium aluminum alloy can be 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