Aluminum alloy casting method

Abstract

The invention discloses an aluminum alloy casting method. The aluminum alloy casting method comprises the following steps: raw materials are supplied; the vacuum melting treatment is performed for the raw materials; one or more times of component correction treatment is performed for the molten liquid until the product requirements are satisfied; the vacuum standing treatment is performed for the molten liquid satisfying the product requirements; and the filtering treatment and the casting treatment are performed for the molten liquid after the vacuum standing treatment. The aluminum alloy casting method can improve the aluminum alloy purity, and reduce the production cost.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to an aluminum alloy melting and casting method. Background technique [0002] At present, high-purity aluminum alloys are widely used in the electronics industry, such as aluminum-chromium and aluminum-titanium alloys, as reflective layers in magneto-optical media; aluminum-copper alloys are used as wire materials in circuits, and Aluminum-silicon and aluminum-silicon-copper alloys can also be used as sputtering target materials, while aluminum-rubidium alloys and aluminum-tantalum alloys are used as metal reflective layers in flat-panel displays. The above-mentioned aluminum alloys have high requirements on purity, density, grain size and surface finish. [0003] The traditional method of making aluminum alloy is to cast in ordinary smelting method to obtain the appropriate ingot composition, and then perform processing such as forging, hot and cold processing, and heat tr...

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Problems solved by technology

[0005] However, when using powder sintering, hot pressing or heating forming methods to make aluminum alloy, it is very easy for the powder to absorb oxygen (up to 0.01%), which makes it difficult to control the oxygen content, and eventually leads to a large number of pores in the casting, which affects the aluminum alloy. performance

In addition, the hot isostatic pressing sintering method needs to use the key pressing and sintering equipment - the hot isostatic pressing sintering furnace. Difficulty, the problem of low service life of the mold, and the production process of each target consumes a set of molds, which increases the production cost of aluminum alloy targets; the strong current heating method requires a device that can obtain a large current, and the positive and negative in the device Electrodes need to have the function of conduction and pressure transmission, and should have good conductivity, toughness and high temperature softening resistance, etc., so the cost is high and it is difficult to promote industrialization

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