Titanium agent used for producing aluminum alloy and preparation method thereof

Abstract

The invention belongs to the field of addition agents of aluminum alloy and discloses a titanium agent used for producing the aluminum alloy and a preparation method thereof. The titanium agent used for producing the aluminum alloy is mainly formed by pressing titanium powder, aluminum powder and fluxing agents to be in a cake shape or a rugby shape. The titanium powder and the aluminum powder are crushed under protection of insert gas. The titanium agent further comprises surface active agents. The titanium agent comprises, by mass, 85%-95% of the titanium powder, 4%-14.49% of the aluminum powder, 0.01%-5% of the fluxing agents and 0.5%-2% of the surface active agents; the density range is 2.6-3.5 g / cm<3> after the above elements are pressed and formed, wherein a: the granularity distribution range of the titanium powder is 10-700 meshes; b: the granularity distribution range of the aluminum powder is 60-300 meshes and the purity of the aluminum powder is greater than or equal to 98%; c: the granularity distribution range of the fluxing agents is 60-300 meshes. According to the titanium agent as the addition agent, the titanium metal element content can reach up to 95%; by the adoption of the titanium addition agent, the melting temperature is low, the titanium addition agent can melt in an aluminum melt as low as 670 DEG C, the melting time is short, the titanium addition agent can melt within 10-15 min, and the recovery rate of the titanium metal element is more than 98%.

Description

technical field [0001] The invention belongs to the field of aluminum alloy additives, and in particular relates to an aluminum alloy titanium additive 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, and alloying is an important part of the aluminum alloy production process. The dissolution of alloying elements in molten aluminum is an important process of alloying. The dissolution of elements is closely related to their properties, and is controlled by the destruction of the bonding force of the solid-state structure of the added elements and the diffusion speed of atoms in the aluminum liquid. Alloying elements commonly used in aluminum alloys are: silicon, iron, copper, magnesium, nickel, zinc, vanadium, etc. Some alloying elements with low melting point or high solubility, such as magnesium and ...

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Problems solved by technology

In addition, due to the low content of alloy elements contained in the master alloy, the amount of master alloy used will be relatively large in the calculation of weighing. In order to ensure the temperature of the molten master alloy, the amount of master alloy added each time should not be too much. If the amount is too much, the temperature of the aluminum melt will drop, and the intermediate alloy cannot be melted. Therefore, when producing the same type of aluminum alloy, it is necessary to add a small amount of the intermediate alloy to the aluminum melt many times, so that it will The following problems are caused: 1. The time required to melt the intermediate alloy is too long; 2. The amount of impurities generated by the reaction of the aluminum melt with oxygen, hydrogen, carbon, moisture and other substances in the atmosphere for a long time increases, resulting in an increase in the amount of impurities in the aluminum alloy. The quality is reduced; 3. Long melting time will increase energy consumption, which will increase the burning loss and air absorption of aluminum melt

However, this method requires a large amount of flux to be realized, so in each additive product, the content of manganese, iron, chromium or titanium can only reach about 85%. If the manganese, iron, chromium or titanium in the additive product If the content of the additive is increased to more than 90%, the amount of the corresponding flux will be reduced. After the product is added to the molten aluminum, the manganese, iron, chromium or titanium in the additive cannot be completely melted; Medium loose, the additive product is usually pressed into a cake or ball with a higher density, and the density is usually greater than 5.0g / cm 3 , but for additive products with higher density, there are the following problems. Taking titanium additives as an example: 1. The melting time is relatively slow, usually more than 20 minutes, and the melting time is long; 2. Additives added to aluminum melt tend to sink to the bottom. Once it sinks to the bottom, on the one hand, it will slow down the melting speed of the titanium powder, and on the other hand, it will lead to uneven dispersion of the titanium powder after dissolution; 3. A dense protective film will be formed on the surface of the denser additive product during the melting process, resulting in internal Unable to continue melting, this will make the recovery rate low, the highest can only reach about 90%

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