Fine powder titanium preparation for producing aluminium alloy and preparation method for fine powder titanium preparation

Abstract

The invention belongs to the field of additives of aluminium alloy, and discloses a fine powder titanium preparation for producing aluminium alloy and a preparation method for the fine powder titanium preparation. The fine powder titanium preparation is a pie-shaped and rugby-shaped preparation formed by pressing titanium powder, aluminium powder and a fluxing agent, wherein the titanium powder and the aluminium powder are separately broken under the inert gas shield. The fine powder titanium preparation further comprises a surfactant. The fine powder titanium preparation comprises the following components in percentage by mass: 85%-95% of titanium powder, 4%-14.49% of aluminium powder, 0.01%-5% of the fluxing agent and 0.5%-2% of the surfactant, wherein a, the range of particle size distribution of the titanium powder is 10-700 meshes, and the average particle size is 100-400 meshes; b, the range of particle size distribution of the aluminium powder and the fluxing agent is 40-500 meshes, and the average particle size is 80-350 meshes. According to the additive disclosed by the invention, the content of titanium metallic element can reach up to 95%; the melting temperature is low by adopting the titanium additive disclosed by the invention; the titanium additive can melt in an aluminium melt at a temperature as low as 670 DEG C; the melting time is short, and the titanium additive can melt in 10-15 minutes; and the recovery rate of the chromium metallic element is as high as 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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