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Aluminum-antimony intermediate alloy and its preparation method and application, the composition and mass percentage of aluminum-antimony are 89.097.0% and antimony 3.011.0%, and the antimony is dispersed in the intermediate alloy in the state of submicron scale aluminum-antimony phase. The aluminum-antimony intermediate alloy of the invention can be used in aluminum-silicon alloy casting production. The aluminum-antimony intermediate alloy of the present invention has the advantages of high dispersion, low segregation degree, fast diffusion rate, good refinement and metamorphism effect on eutectic silicon and primary silicon, and can solve the technical problems of coarse silicon of aluminum-silicon system alloy and high aspiration tendency in melt treatment process.
Antimony intermediate alloy and its preparation method and application
Antimony intermediate alloy and its preparation method and application, its composition and mass percentage are Al 89.0? 97.0%, antimony 3.0? 11.0%, the antimony is dispersed in the intermediate alloy in a submicron scale aluminumantimonide phase state. Aluminum of the present invention? Antimony intermediate alloy can be used in aluminum-silicon alloy casting production. The submicron aluminum antimonide phase of antimony alloy has high dispersion, low segregation degree and fast diffusion rate. It has a good refining effect on eutectic silicon and primary silicon and can solve the problem of aluminum alloy. The technical problems of silicon coarseness and high suction tendency in the process of melt treatment in silicon alloys.
The invention relates to an Al-antimony intermediate alloy and a preparation method and application thereof
Al-si alloy is the most used cast aluminum alloy, with good fluidity, light weight, wear resistance, low cost advantages, is an ideal engine piston material, is also commonly used as automotive hub materials. Silicon is the strengthening phase of the alloy to improve the mechanical properties of the alloy. However, under conventional solidification conditions, the primary silicon in Al-Si alloy is coarse particles, and the eutectic silicon is coarse sheet, which is easy to produce stress concentration at the tip and corners, thus reducing the mechanical properties. In order to overcome the above defects, refining and metamorphic treatment is usually used to reduce the size of silicon and optimize the mechanical properties of the alloy. Refinement modification treatment is to add some fine nucleating agent (also known as inoculant or modifier) to the metal liquid, so that it forms a large number of dispersed artificial non-spontaneous crystal nuclei in the metal liquid, so as to obtain fine cast grains, to improve the performance of materials. The methods of refinement and modification are mainly the modification of eutectic silicon by strontium and primary silicon by phosphorus. However, the deterioration of strontium is easy to produce needle-like pores and form waste products. It is easy to interact with phosphorus, boron and other elements in aluminum melt, leading to the deterioration of the alloy properties.
The metal antimony has a lower aspiration tendency and a stronger refining and metamorphic effect. It is also used in the refining and metamorphic of Al-Si alloy, and has the effect of improving the properties and plasticity of Al-Si alloy. A new method of adding antimony in antimony modified aluminum alloy was proposed. The small piece of pure antimony was immersed into the aluminum-silicon alloy melt by using a bell bell with small holes. The secondary smelting of antimony was avoided and the purity of the melt was improved. This method shortens the production process. However, the bulk of antimony is large, the diffusion rate is slow, the metamorphic treatment time is long, it is difficult to avoid antimony segregation. A method of antimony modification for sand casting of ZLl 16 aluminum alloy is proposed, that is, aluminum - antimony alloy is used as the modifier, the alloy is treated with sodium salt after the pinhole serious problem, the resulting spherical eutectic silicon casting modification structure, the patent does not state the key modifier and does not claim the rights. In addition, increasing the antimony content will significantly increase the melting point of the intermediate alloy, which makes the primary aluminum antimonide of the conventionally solidified aluminum-antimony intermediate alloy have coarse grains and a long melt processing process, so it is difficult to avoid the segregation of metal antimony, which will affect the refinement of silicon.
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