A kind of manganese additive for aluminum alloy and preparation method thereof

Abstract

The invention belongs to the field of additives for aluminum alloys, and discloses a manganese additive for aluminum alloys and a preparation method thereof. The manganese additive includes manganese powder, aluminum powder, iron powder and flux, and the manganese powder, aluminum powder, Iron powder and flux are crushed under the protection of inert gas, and surfactant is also included; the contents of each component are: manganese powder 86%-97%, aluminum powder 2.39%-6.39%, flux 0.01%-5% , 0.5%-2% surfactant, 0%-6% iron powder; the particle size distribution of manganese powder is 35%-40% for 325-700 mesh, 40%-45% for 100-325 mesh, and 40%-45% for 60-100 mesh 5%-15% and 0-5% for 10-60 mesh; the particle size distribution of aluminum powder is 60-300 mesh; the particle size distribution of flux is 60-300 mesh. The method includes (1) crushing, (2) batching, (3) mixing, (4) pressing, (5) drying, (6) packaging and the like. The manganese additive used for aluminum alloy of the invention has high manganese content, low melting temperature and short melting time when dissolved in aluminum liquid, and high manganese recovery rate.

Description

technical field [0001] The invention belongs to the field of additives for aluminum alloys, and in particular relates to a manganese additive for aluminum alloys and a preparation method thereof. Background technique [0002] With the continuous development of aluminum processing and aluminum alloy industry, the development of aluminum alloy is listed as a key development technology. Alloying is an important part of the aluminum alloy production process, and the melting of alloying elements in molten aluminum important process. [0003] At present, alloying elements usually include copper, silicon, magnesium, zinc, manganese, iron, chromium and so on. During implementation, the temperature of aluminum alloy melting and casting is usually 710-750°C. Alloy elements with low melting point or high solubility such as silicon magnesium, copper, etc. can be melted directly in the form of elemental metal powder, but for manganese, Alloy elements with high melting point or low solu...

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Problems solved by technology

However, the production of manganese powder with concentrated particle size distribution is difficult, and it takes a lot of manpower and material resources to strictly control the process parameters in the production process. Repeated analysis and testing, because the large particle size powder after sieving needs to be crushed and sieved again until it reaches the corresponding particle size range, the efficiency is low, while the small particle size powder after sieving cannot be used normally and can only be recycled , re-smelting and crystallization, low efficiency and high production cost, so the production cost of manganese additives made of manganese powder and other additives is also high

[0007] In addition, in order to avoid the loosening of additive products during transportation, the additive products are usually pressed into cakes or balls with high density. The density of existing manganese additives used in aluminum alloy production is usually greater than 5.0g / cm 3 , but for additive products with higher density, there are the following problems: 1. The melting is relatively slow, and the melting time is usually more than 20 minutes, and the melting time is long; 2. The additives added to the aluminum melt tend to sink to the bottom. It will cause the melting speed of manganese powder to slow down, and on the other hand, it will lead to uneven dispersion of manganese powder after dissolution; 3. A dense protective film will be formed on the surface of the denser additive product during the melting process, which will cause the inside to fail to continue melting, so that Will make the recovery rate (i.e. the melting rate of manganese) lower

[0008] In summary, when the existing manganese additives are dissolved in molten aluminum, the melting time is longer, the melting temperature is higher, and the recovery rate of manganese is low, and the melting time, melting temperature, and recovery rate of manganese need to be further improved

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