Al-P intermediate alloy and preparation method thereof

Abstract

The invention belongs to the field of metal materials and particularly relates to an Al-P intermediate alloy which is used to refine primary crystal silicon in the Al-Si alloy and Mg2Si in the Mg-Si alloy, and a preparation method thereof. The Al-P intermediate alloy contains two elements, namely Al and P. The Al-P intermediate alloy is characterized in that the alloy comprises the following components by weight percent: 92.5-98.5% of Al, 1.5-7.5% of P and less than 0.8% of impurities. The preparation method of the Al-P intermediate alloy comprises the following steps of: mixing aluminum powder and black phosphorus powder evenly, drying, briquetting with a press machine, placing the obtained blocks in an electric furnace with the inert atmosphere or other heating devices, heating to 600-750 DEG C, keeping the temperature for 45-120 minutes, stopping heating, and cooling along with the furnace to obtain the blocky Al-P intermediate alloy or extruding the sintered blocks into wires. The Al-P intermediate alloy has a good refinement effect on the Al-Si alloy and the Mg-Si alloy.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to an aluminum-phosphorus master alloy used for refining primary silicon in Al-Si alloy and Mg2Si in Mg-Si alloy and a preparation method thereof. Background technique [0002] In industrial production, the method of adding phosphorus is generally used to refine the primary silicon in Al-Si alloy (also known as modification treatment), mainly in the form of red phosphorus, phosphorus salt or phosphorus-copper intermediate alloy. But these methods all have many disadvantages: red phosphorus has a low ignition point (240°C), and a large amount of toxic P is released during deterioration treatment. 2 o 5 Gas, which seriously pollutes the environment; the phosphorus-copper master alloy has high density and high melting point. Under the condition of static furnace smelting, it is easy to precipitate and difficult to melt after being added to the aluminum alloy melt, and the me...

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Problems solved by technology

But these methods all have many disadvantages: red phosphorus has a low ignition point (240°C), and a large amount of toxic P is released during deterioration treatment. 2 o 5 Gas, which seriously pollutes the environment; the phosphorus-copper master alloy has high density and high melting point. Under the condition of static furnace smelting, it is easy to precipitate and difficult to melt after being added to the aluminum alloy melt, and the metamorphic effect is unstable, and the copper content in the alloy increases.

The phosphorus-containing aluminum-based ternary or more than ternary master alloys involved in the above documents and patents are not easy to be rolled into wire rods due to their high brittleness.