A kind of aluminum-manganese alloy and its powder metallurgy forming method

Abstract

The invention discloses an aluminum-manganese alloy and a powder metallurgical molding method thereof. The aluminum-manganese alloy comprises, by weight percent, 70% to 75% of aluminum and 25% to 30% of manganese. The powder metallurgical molding method of the alloy comprises the steps of firstly, preparing of raw materials, auxiliary materials, tools and devices; secondly, vacuum induction smelting of the alloy; thirdly, preparing of mother alloy powder; and fourthly powder metallurgical molding. The aluminum-manganese alloy is low in impurity content, fine in grain, uniform in component and high in manganese content; the powder metallurgical molding method of the alloy is high in purification, free of pollutants, free of waste gas, easy to control, stable in quality and high in yield.

Description

technical field [0001] The invention relates to the field of aluminum alloy forming, in particular to an aluminum-manganese alloy and a powder metallurgy forming method thereof. Background technique [0002] At present, the chemical composition of high-purity aluminum master alloy ingots in my country is in accordance with the HB5371-1987 standard, which stipulates that the Mn content of the aluminum-manganese master alloy is 9 to 11%, and the main impurity element content requirements are as follows: Si ≤ 0.04%, Fe ≤0.08%, Mg ≤ 0.05%, other single ≤ 0.05%, other sum ≤ 0.15%. The production of high-purity aluminum alloy requires the lower the impurity elements, the better. Therefore, higher requirements are put forward for the high-purity aluminum master alloy used. The published production method adopts the method of mixing, and the raw materials are 75Mn agent and electrolytic aluminum, which are melted in the furnace and kept for a sufficient time and stirred by mechanica...

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Problems solved by technology

The aluminum-manganese master alloy produced by this method has disadvantages such as large composition segregation and high content of trace impurity elements; at the same time, since the manganese content is only 9-11%, the amount of master alloy ingot used will be relatively large when used, which is harmful to smelting. more trouble and possible segregation

[0003] Among the relevant patents that have been applied in China, the patent "Preparation Method of High Purity Al-Mn Master Alloy" (application number: 201110080516.8, publication date: 2011-08-24) discloses a preparation method of high-purity Al-Mn master alloy. However, in its production process, due to the absence of a vacuum environment, degassing and impurity removal are insufficient; as there is no restriction on the crucible material for smelting, conventional cast iron crucibles may be used, which will make it difficult to control the content of impurity iron. It is non-vacuum smelting and no powdering treatment, and its original grains are not refined enough, which leads to the fact that the final finished aluminum-manganese alloy can provide a small number of nuclei, uneven distribution, and grown grains when used as a grain refiner. The particle size is large, and at the same time, due to the lack of powder metallurgy, the ratio of manganese supersaturation cannot be used (if it is supersaturated, it is easy to segregate, which will lead to uneven composition of the intermediate alloy ingot and inaccurate weighing during application), so The manganese content is low, that is, the efficiency of the product is low; on the other hand, compared with the conventional method, the method adopted in this invention will still produce waste gas and waste residue that are difficult to handle, and because there is no high-efficiency equipment, the entire process is not easy to control, and finally made The quality of aluminum-manganese alloy is unstable

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