A kind of aluminum-tungsten master alloy and its production method

Abstract

The invention relates to an aluminum-tungsten intermediate alloy and a preparation method thereof. The preparation method is simple and practical and is beneficial to the realization of industrialization. The mass percentage of tungsten in the prepared aluminum-tungsten intermediate alloy is 1-10%, the second phase in the alloy is evenly distributed, and the purity is higher. The preparation method includes the steps of preparation of raw materials, aluminum ingot melting / aluminum liquid transfer-in, treatment of tungsten-containing substances, adding, alloying, refining treatment and castingprocess; specifically, one or more of tungsten rods, tungsten blocks or tungsten wires are mixed with a fluxing agent, aluminum ingots are put into an electric furnace to melt or are transferred intoaluminum liquid molted in advance, when the temperature of the aluminum liquid is 700-1300 DEG C, the raw materials are added into the melt by using a feeding device, the metal tungsten is rapidly melted in low-temperature aluminum alloy liquid by using the electromagnetic induction eddy current effect, and after homogenization treatment, a cast ingot is casted at the temperature of 700-1300 DEG Cto obtain the aluminum-tungsten intermediate alloy.

Description

technical field [0001] The invention belongs to the field of master alloys, and relates to an aluminum-tungsten master alloy, in particular to an aluminum-tungsten master alloy and a production method thereof. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. [0003] Tungsten-containing aluminum alloy is a new type of special high-strength aluminum alloy structural material newly developed in China. It has the advantages of high temperature resistance, low thermal expansion coefficient of tungsten and light weight, oxidation resistance and good processability of aluminum. It is very Special alloy materials with development prospects are expected to become a new generation of alloy armor materials and aerospace engine structural materials. [0004] Because tungsten is a refractory meta...

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Problems solved by technology

However, both of these two processes have obvious disadvantages: there are always pores inside the product sintered by powder metallurgy, and the density cannot meet the performance requirements of the product; and it is difficult to form products with more complex parts by powder pressing, so These two methods are difficult to be applied in industrial production, so it is necessary to develop a low melting point tungsten-containing aluminum master alloy

[0007] The two production methods in the above-mentioned patents are the aluminothermic reduction method to produce aluminum-tungsten-based master alloys, which are used for titanium alloys with high melting points and cannot be melted and used normally in the aluminum-tungsten alloy melting process; they contain other materials such as niobium, molybdenum, titanium, etc. Elements, which may be impurity elements for aluminum alloys, affect the quality of products

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