Method for preparing aerospace-level vanadium-aluminium alloy

Abstract

The invention provides a method for preparing an aerospace-level vanadium-aluminium alloy. The method comprises the following steps: uniformly mixing vanadium pentoxide, metallic aluminium and a coolant, putting into a smelting furnace, igniting and smelting to obtain a vanadium-aluminium alloy with the vanadium content of 75-85wt% and slag; adding the vanadium-aluminium alloy obtained through the smelting into a vacuum induction furnace, adding aluminum, remelting and refining to obtain the aerospace-level vanadium-aluminium alloy with the vanadium content of 45-55wt%, wherein the mass ratio of the added aluminum to the added vanadium-aluminium alloy is 0.45-0.77. The method provided by the invention has the advantages that the aerospace-level vanadium-aluminium alloy can be obtained; the smelting furnace does not need to be knotted and only simple filling is carried out by using corundum fine powder with the particle size less than 5mm, the furnace body can be protected and the requirements for smelting the vanadium-aluminium alloy through aluminothermy are satisfied, so that the production cost is reduced and the method is simple in operation.

Description

technical field [0001] The invention relates to the field of preparation of vanadium-aluminum alloys, and more specifically, relates to a method for preparing aerospace-grade vanadium-aluminum alloys. Background technique [0002] As an important additive of titanium alloy, vanadium-aluminum alloy can be used to improve the performance of titanium alloy, making it more advantageous in terms of strength, toughness, formability, corrosion resistance, and high temperature resistance. At present, the two most widely used vanadium-containing titanium alloys are Ti-6Al-4V (containing 4wt%V) and Ti-8Al-1Mo-1V. These two alloys account for about 50% of the titanium alloy market and are mainly used in the production of jet Engines, high-speed aircraft skeletons and rocket engine casings, etc. [0003] Domestically produced vanadium-aluminum alloys are mainly used for civilian use. So far, the aerospace-grade vanadium-aluminum alloy market is still dominated by subsidiaries of forei...

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Problems solved by technology

With the rapid development of my country's aerospace industry, a lot of research has been done on aerospace-grade vanadium-aluminum alloy in China in recent years, but there are still problems such as complex process and high cost.

[0004] For example, Chinese patent application No. 201110080517.2 discloses a method for preparing a high-purity aluminum-vanadium master alloy. The method uses nitrogen or argon as a carrier to uniformly spray an aluminum melt with a refining agent into the melt for refining to remove At the same time, there are requirements for the flow rate of nitrogen or argon, the amount of refining agent, the temperature, etc., and the covering agent for aluminum melt of potassium salt or sodium salt of 1mm to 3mm is sprinkled on the surface of molten aluminum, and the process is complicated; The Chinese patent with application number 201310020155.7 discloses a method for preparing vanadium-aluminum alloy materials. Add 0.2 to 0.25 times of vanadium pentoxide and aluminum metal to the raw material and melt it in a vacuum medium frequency induction furnace at 1800°C to obtain a diameter of 20-25mm vanadium-aluminum alloy solid balls bake the mold at a predetermined temperature and press the material in the mold with a predetermined pressure. Not only the process is complicated, but the cost is also high

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